DE2351953A1 - Tower crane with folding jib - has sections joined by intermediate frame with pivot pins in end faces - Google Patents

Abstract

The crane has a jib foot section pivoting on it about a horizontal axis, and a head section, both of triangular section with the apex upwards, being particularly of the type with a travelling crab. A V-shaped recess is formed between the adjacent jib section ends, with the axis of its apex at the bottom and running transversely. The head section folds parallel to the foot section so that their longitudinal members which are lowest in the working position lie against each other. The two jib sections are joined by means of an intermediate frame, attached to each section by a link with a pivot pin in each section end face.

Description

Patent attorneys Dipl., ~ Ixg. E ¥ e; ckmäkk. 2351953

DlP £. -I NG .. EL Wj & ICKMAN N, - DΓPL ₁ -PHnTSL Dr. K., FeNCKE

'- DiPL., - lN (i. RÄ, We: εCKJSiann, Dipl-Ckim- B .. Hubee

8: MÖNCHEN 86, THE POST BOX 860,820 QfJ _M

Möhl & ROUTE _Z2: NUMBER. 48 39 21/22

C9839 21722)

Hans: T a χ _t
8 M ΐι η C hen 40, Potsdamer Strasse 3

T urmkra η.
(Keyword: collapsible arm)

The invention relates to a tower crane with a crane tower and one of one, on the Eran tower around a horizontal one Axis pivoted boom foot part and a boom consisting of a boom tip part, in particular a trolley boom in which the boom foot part and the boom tip part have an essentially identical, isosceles triangular cross section own, the tip of the isosceles triangular cross-section (top flange) - in the working position of the boom considered - lies above and between each other facing end faces of the boom parts a V-shaped incision is formed with in the base of the isosceles triangular Cross-section lying and submerged.

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_ 2; -.

V-vertex axis standing right to the longitudinal axis of the boom and to the longitudinal axis of the boom essentially perpendicular ¥ angle bisector plane »

Such tower cranes are known.

It is to continue from the DAS 1556346 known to a tower crane with a two-piece boom, the two boom parts by joints connected to one another in such a way _f that the cantilever tip part to the Auslegerfußteil axially parallel to this is beiklappbar such that each have a side surface, and the upper chords of the boom foot part and the boom tip part are adjacent to one another. This embodiment has the advantage that after folding the boom foot part onto the tower and folding the boom tip parts onto the boom foot part, the total height of the package created by folding in is perpendicular to the longitudinal axis of the boom parts and perpendicular to the hinge axis between the crane tower and the boom foot part, measured solely by the tower cross-section and the simple boom cross-section is determined without the boom tip portion additionally contributing to the height of the package. This is significant because it reduces the overall height of the crane during road transport, which in turn is essential with regard to driving through tunnels and driving under lines spanning roads.

The disadvantage of the known embodiment is that the folding of the boom foot part on the tower and the boom tip part on the boom foot part a force must be effected that does not come with the liindwerke already installed on the crane can be, but either special strength equipment, or

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requires manual operation.

A tower crane is also described in DT-OS 2 121 232, the boom parts of which can be folded up in such a way that the boom tip part stops when it is unfolded the boom foot part at the same time laterally offset about an axis perpendicular to the boom and tower longitudinal axis so that it comes to rest with its upper belt at the bottom next to the boom foot part. Disadvantageous here is the constructive effort: two gimbals hinged to both boom parts, which bend are stressed and must be dimensioned accordingly large and one protruding from the boom Frame construction «

The invention is based on the object ^ a tower crane of the type described at the outset in such a way that the boom tip part in the course of the processes the application of the jib foot part to the tower and the jib tip part to the jib foot part essentially inevitably arrives in the position in which ge a side surface and the upper chords of the boom foot part and the boom tip portion are adjacent to each other.

To solve this problem, it is proposed according to the invention that that the two boom parts through a gap are connected to each other, which is connected to each of the boom parts by a joint with approximately in -, the respective end face lying joint axis is connected.

In a preferred embodiment of the invention, the intermediate frame with the boom foot part is through one

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first joint connected, the joint axis of which is in the edge lies between the end face and a side face of the boom foot part and with the boom tip part connected by a second hinge, the hinge axis of which is in the edge between the base surface and the end surface of the boom tip is located; the intermediate frame is attached to the boom foot part by releasable connecting means so identifiable in the area of the V-Sdieitelachse, that the second hinge axis is parallel to the edge between the end face and the base face of the boom foot part lies.

This embodiment is particularly advantageous for various reasons:

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The folding of the jib foot part on the crane and the jib tip part on the jib foot part up to the position _t in which one side surface and the upper chords of the jib foot part and the jib tip part are adjacent to one another can only be achieved here by ropes that are used to brace the jib parts in the Working position are required anyway, the position of the boom parts during the folding process in each intermediate position by the. respective rope length is clearly determined.

On the other hand, a joint changeover work only needs to be carried out once when folding in, namely when the intermediate frame, which is initially fixed to the tower with the cantilever foot part during the folding in of the boom foot part, has to be detached from the boom foot part to such an extent that the intermediate frame can subsequently be pivoted about the first hinge axis . However, this conversion work can - and this is a particular advantage - be carried out when the jib foot section has already been folded up on the tower and the work area is therefore lowered so far that it can be accessed without danger to the worker.

As a rule, the end faces of the boom foot part and the boom tip part with the respective base area enclose an angle of 45 °; the first phase the folding processes then include folding the boom foot part on the tower and pivoting the , Boom tip part relative to the boom foot part by 90 °, so that at the end of this phase the boom foot part

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hangs in a vertical position and the boom tip part is in a horizontal position on the boom foot part connects and the V-shaped gap is closed.

In order to be able to carry out the folding processes, a boom foot part adjustment device will be provided which allows the boom foot part to be adjusted between a hanging position and the working position; Furthermore, a boom tip part adjustment device will be provided, which can be synchronized with the boom foot part adjustment device in such a way that the boom tip part is pivoted when the boom foot part is transferred from the working position to the hanging position with the intermediate frame fixed on the boom foot part around the second articulation axis until the end surface of the boom tip part rests on the intermediate frame ; Auslegerspitzenteilver- the same actuator ¹ is then also responsible for causing at Auslegerfußteil dissolved from the intermediate frame folded in the cantilever tip part together with the intermediate spaces about the first hinge axis to the Auslegerfußteil.

The boom tip part adjustment drive can be from a Be formed jib tip part adjustment rope, which is arranged in the tower area by a jib tip part adjustment wind / Erk to a deflection point arranged in a central length area of the boom foot part and from there freely to a point of attack arranged in a central length region of the boom tip part is led. In order to fully attach the jib tip part to the jib foot part with this rope to be able to fold in and the lowest possible rope forces

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and reaction forces at the rope deflection points, one becomes the distance between the point of attack and the bisecting plane of the V-incision smaller, but preferably approximately equal to the distance of the deflection point make of this bisector plane. The deflection point and the point of attack in the area are preferred of the upper chord, around the largest possible attack lever arms in relation to the two joint axis to have at the beginning of the first phase of the folding process.

In the working position, the jib foot part and the jib tip part can each come from the crane tower Guy rope be worn, while the guy rope holding the boom foot part can verse the boom foot part part of the facility.

The two guy ropes can be from one at the top of the tower Pivotably arranged guy braces go out, which optionally mediate via an intermediate spreader one. Bracing spreader adjustment cable is adjustable.

In another, less preferred embodiment the two boom parts are in the working position a detachable connection in the area of the V-apex axis and the joint axes of the intermediate frame and the joints connecting the two arms are - viewed in the working position - in one arranged parallel to the longitudinal axis of the boom, but inclined with respect to the base surface of the boom plane .

The accompanying figures explain the invention using an exemplary embodiment. They represent:

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Fig «1 A crane according to the invention in the working position,

FIG. 2 shows the crane according to FIG. 1 in an intermediate position during the folding of the Boom parts to the tower,

Fig. 3 shows an enlargement of the junction between the two boom parts in the working position according to FIG. 1,

Fig. 4 shows the connection point between the two boom parts in enlargement the intermediate position according to FIG. 2,

Fig. 5 shows the two boom parts in the folded position to one another and to the tower »

6 shows the connection point between the two boom parts in another embodiment in side view of the working position,

7 shows a plan view of FIGS. 6 and

Figure 8 is an end view of the two facing each other

folded boom parts according to Fig. 6 and 7.

In the embodiment according to FIGS. 1 to 5, a running gear of the crane is designated by 10. This The bogie carries a crane foot 12. Above the crane foot rises a telescopically shortenable one in the example Crane tower 14, which can be folded down about a horizontal pivot axis 16 to the rear.

On the crane tower 14 is a horizontal pivot axis

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se "TS a boom pivotably articulated * which is generally designated by: 20;., This boom 20 is composed of a boom foot 22 and a boom tip part 24 ... The two boom parts 22 and 24 are articulated at 26: with one another connected ;: the formation of the * connection point will be discussed "Each of the boom parts 22, 24 has an isosceles triangular cross-section. The base area of the boom support is designated 22a (lower chord); the top line is designated 22b (upper chord) The end surface of the boom foot part facing the boom tip part is denoted by 22c .. The base area of the boom base part is correspondingly indicated by 24a (lower chord), the top line with 24b (upper chord); and the end surface facing the boom foot part with 24c The end surfaces 22c and 24c define between them a T-shaped incision 3 & - _r, the apex line of which is denoted by TV the two boom parts 22 and 24 around. the apex line VV with each other ^^ articulated, connected., -. .

In the working position, the two boom parts 22 and 24 are guyed by one guy rope 22d and 24d each. The two guy ropes 22d and 24d emanate from a spreader spreader 2S which is articulated to the tower 14 around the articulated axis 18 Running frame goes out and runs over an intermediate spreader 3 ^: 2.

The connection between the two cantilever parts 22 and 24 is constructed as shown in FIG

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At the boom foot part 22 there is a gap 34 a first articulation axis I-I pivotably articulated; the Joint axis 1-1 coincides with an edge of the End surface 22c 'of the boom foot part 22.

On the intermediate frame 34 is about a second hinge axis II-II of the casual tip part 24 is pivotably arranged. The second joint axis H-II coincides with the vertex axis V-V of Flg. 1 together. The two boom parts 22, are detachable by lying in the joint axis H-II Insert pins 36 are articulated together. As long as the Insert pin 36 on the two boom parts 22, 24 hold together the rocker axis V-V, the intermediate rain en 34 on the end surface 22c of the boom foot 22.

If the off casual tip part 24 for the purpose of collapsing of the crane for later road transport to the From the casual foot part 22 and together with it is to be folded up to the tower, proceed as follows:

First, the jib foot part 22 SQ _{1 is} folded onto the tower 14, as shown in FIG. 2. Synchronously with this ViIrd by means, which will be discussed later, the jib tip part 24 is pivoted relative to the jib foot part 22 about the second hinge axis H-II, - so that the jib tip part 24 assumes an essentially horizontal position * as soon as the jib foot part 22 is suspended occupies a substantial vertical position. This closes the V-shaped incision 38. ' The intermediate frame 34 remains fixed on the boom foot part 22 during this process.

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When the position of FIG. 4 is reached, the insert bolts 36 are pulled out. The intermediate frame can now be pivoted together with the boom tip part 24 about the first joint axis I-I, wherein the intermediate frame 34 its coincident with the end surface 24c Maintains position opposite the boom tip part 24 ". A securing of the intermediate frame

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34 on the end face 24c of the boom tip part 24 may be provided, but is not necessary. By the pivoting of the boom tip part 24 about the first Joint axis I-1 "is finally reached the end position according to FIG. 5, in which the upper belt 24b the Upper belt 22b is adjacent and the side surface 24e of the boom tip part 24 of the side surface 22e of the boom foot part 22 is adjacent.

It can be seen that in the position of FIG. 5, the total height of the tower 14, jib foot part 22 and Boom tip part 24 formed package substantially is only determined by the tower cross-section and the cross-section of the boom base and the height of the boom tip part 24 does not add anything to the height.

The transfer of the jib foot part 22 from the position according to FIGS. 1 and 3 into the position according to FIGS 2 and 4 takes place by releasing the guy rope 22d accordingly; this rope in turn is thereby subsided, that the brace adjustment cable 30 is slackened, wherein the brace 28 and the intermediate spreader 32 pivot clockwise in FIG. 1. Simultaneously with the decrease in the Guy rope 22d is drawn to a jib tip jib rope 40 driven by a jib jib jib rope winch 42 coming via a pulley 44 at the top of the tower and a deflection point 45 in the area of the Upper chord 22b of the jib foot part 22 to an attack point 46 in the area of the upper chord 24b of the jib tip part 24 runs. It should be noted that this rope, which runs from the pulley 44 to the

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steering point 45 runs within the boom base 22, at the deflection point 45 from the. Inside the Outrigger foot part 22 is led out and from there "runs completely free" to the point of attack 46. The Guy rope 24d of the jib tip part is moved from the position of FIG. 1 when the jib is transferred and 3 in the position of Figures 2 and 4 slack » The synchronization between the guy rope 22d and your boom tip adjustment rope 40 is not shown, but it goes without saying.

The same jib Spitz-adjusting cable 40 "that in the transition from the position of Figures 1 and 3. In the position of Figures 2 and 4 _ensures; that the Äuslegerspitzentell 24 opposite the Äuslegerfußteil 22 (as viewed in FIG. 1) by about 90 ° in the counterclockwise direction is pivoted, is also used to order from the position of Figures 2 and 4 out the Auslegerspit- zenteil 24 to the already on. Tower 1.4 folded boom foot part 22 also ^ still to be folded. The course of the rope in Fig. 2 shows that this is easily possible because the jib tip adjustment cable 40 can generate a moment about the hinge axis Γ-Ί on its course from the deflection point 45 to the point of application 46.

It should also be noted that the distance between the deflectors le 45 and the point of attack 46 from the bisector plane ¥ - ¥ is roughly the same. The meaning of this statement is readily apparent from FIG. 2: would the distance of the point of attack 46 from the bisector plane ¥ - ¥ greater than the distance of the deflection point 45 from the ¥ angle bisector ¥ - ¥, so could the boom tip part 24 from the position of FIG. not fully folded out onto the boom foot part 22

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will; on the other hand would be the distance between the deflectors 45 from the ¥ incellialbeing level ¥ - ¥ much larger than the distance between the point of attack 46 and this plane, very large rope forces and reaction forces would arise of the deflection point 45 occur around the boom tip part 24 to be fully folded onto the jib foot part 22.

In the embodiment of Figures 6, 7 and 8 are Identical parts are provided with the same reference numerals, respectively increased by the number 100 «

The two boom parts 122 and 124 are in the working position according to FIGS. 6 and 7, articulated with one another about a hinge axis which coincides with the V-r vertex axis V-V tied together. This articulation is releasable. In addition, the two boom parts are through the intermediate interconnecting frame 134 connected to each other. This intermediate frame 134 is on the one hand by a joint 148 with the joint axis III-III with the boom foot part 122 and on the other hand through a joint 150 with the joint axis IV-IV with the boom pointed enteil 124 connected.

Around the boom tip portion 124 to the boom foot portion 122 close, the connection between the two parts in the V-vertex axis V-V is released, so that Then, the frame 134 rotate about the hinge axis III-III and the boom tip portion about the hinge axis IV-IV can until the position of FIG. 8 is reached. In this position, the upper belt 124b again lies on the upper belt 122b and the side surfaces 122e and 124e also lie against one another at.

So that a parallel position of the boom parts occurs, it is necessary that the two joint axes

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III-III and IV-IV certain plane parallel to the longitudinal axis of the boom - viewed in the working position. The position which the two joint axes III-III and IV-IV must take, so that on the one hand the boom parts when collapsing are not in the area of the end faces 122c, 124c collide and the parallel position cannot therefore be achieved and on the other hand the side surfaces 122e, 124e after folding in one The smallest possible distance from one another can easily be determined by calculation or experiment.

It should be added to both embodiments that the boom is driven on by a trolley which is in Fig. 1 is drawn in and denoted by 50 there.

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Claims (1)

Claims 1.7Turmkran with a crane tower and one of a ^ - ^ wherein the Auslegerfußteil and the boom tip portion have a substantially same isosceles-triangular cross-section on the crane Turin about a horizontal axis pivotably articulated Auslegerfußteil and a cantilever tip part existing boom, in particular trolleys boom ,,, the tip of the isosceles triangular cross-section (top chord) - viewed in the working position of the boom - lies at the top and a V-shaped incision is formed between the facing end surfaces of the boom parts with a base of the isosceles triangular cross section lying perpendicular to the boom axis V-apex axis and to the longitudinal axis of the boom essentially perpendicular bisector plane, the two boom parts are connected to one another by joints, in such a way that the boom tip part can be folded axially parallel to the boom foot part, such that each a side surface and the upper chords of the jib foot part and the jib tip part are adjacent to one another, characterized in that the two jib parts (22, 24) are connected to one another by an intermediate frame (34) which is connected to each of the jib parts (22, 24) by a joint is connected in the respective end surface t (22c, 24c) lying joint axis. *, 2. Tower crane according to claim 1, characterized in that that the intermediate spaces (34) with the boom foot part (22) is connected by a first joint, the Joint axis (I-I) (first joint axis) in the edge between the end surface (22c) and a side surface (22e) - 15 5 09817/0151 of the boom foot part (22) and connected to the boom tip part (24) by a second joint whose joint axis (IT-II) (second joint axis) in. the edge lies between the base surface (24a) and the end surface (24c) of the boom tip part (24) and that the toe frame (34) on the boom foot part (22) can be fixed in this way by releasable connecting means (36) is that the second hinge axis (II-II) is parallel to the edge between the end surface (22c) and the base surface (22a) of the boom foot part (22) is located. Tower crane according to one of Claims 1 and 2, characterized in that the end faces (22c, 24c) of the jib foot part (22) and the jib tip part (24) with the respective base surface (22a, 24a) enclose an angle of approx. 45 °. Tower crane according to one of Claims 2 and 3, characterized in that a jib foot part adjustment device is provided, which an adjustment of the boom foot part (22) between a hanging position and the working position and that a boom tip part adjustment device is provided, which is synchronized with the boom foot part adjustment device in such a way that the boom tip part (24) when transferring the boom foot part (22) from the working position to the hanging position with the toe frame (34) fixed on the boom foot part (22) around the second hinge axis (II-II) up to the abutment the end face (24c) of the boom tip part. (24) is pivoted to the intermediate frame (34) and which then, with the toe frame (34) detached from the jib foot part (22), the jib tip part is folded in (24) together with the toe frame (34) around the first hinge axis (i-I) on the jib foot part (22). - -16 509817/0151 5. Tower crane after. Claim 4, characterized in that the boom tip part adjustment drive'ein Comprises boom tip part adjustment rope (40), which is arranged in the tower area from a boom tip part adjustable winch to one in one middle length range of the boom foot part (22) arranged deflection point (.45) and from there free up to an attack point (46) arranged in a central length region of the boom tip part (24) is performed, the distance of the point of attack (46) from the bisector plane (VMf) of the V-incision (38) smaller, but preferably approximately the same as the distance between the deflection point (45) and this bisecting plane (¥ - ¥) is. 6. Tower crane according to claim 5, characterized in that the 'deflection point (45) and the * Attack point (46) are arranged in the area of the upper belt (22b, 24b). 7. Tower crane according to one of claims 1 to 6, characterized characterized in that the boom foot part (22) and the boom tip part (24) in the working position by one guy rope each from the crane tower (22d, 24d) is tensioned. 8. Tower crane according to claim 7, characterized in that the two guy ropes (22d, 24d) start from a brace (28) which is pivotably arranged at the top of the tower and which, if necessary, extends over an intermediate spreader (32) can be adjusted by means of an anchoring spreader adjustment cable (30). 9. Tower crane according to claim 1, characterized in that the two boom parts (22, - 17 - 5 09817/0151 24) in the working position by a detachable connection (36) in the area of the V-apex axis V-V with one another are connected and that the hinge axes of the Zv / ischenrames (34) and the two boom parts (22, 24) connecting joints - viewed in the working position - in one to the longitudinal axis of the boom (20) are parallel to the base of the boom (20) -but inclined plane. 509817 / 01S1