EP1666401B1 - Mobile crane - Google Patents

Description

The invention relates to a vehicle crane, in particular a mobile, car or crawler crane.

In crane technology, a distinction is made according to a common classification between tower cranes or tower cranes on the one hand and mobile cranes on the other.

Tower cranes have a vertical tower standing on a substructure, which is usually designed as a lattice framework, and although they are used, for example, on construction sites, e.g. be movable by means of a track undercarriage - not designed as a vehicle movable in normal traffic. By contrast, mobile cranes are self-propelled road vehicles that are currently being designed for mobile use.

Mobile cranes consist of a chassis comprising the chassis and a superstructure rotatable on the undercarriage, comprising a slewing gear and a jib. The boom can be designed as a telescopic boom in box construction or as a lattice boom.

Cranes are increasingly demanding, both in terms of capacity or lifting capacity and in terms of the height in which the loads must be lifted.

As a field of application for cranes, the construction of wind turbines is becoming increasingly important, as there is a trend towards ever more powerful wind turbines, which not only have higher, but also heavier components.

The problem with the construction of wind turbines by means of cranes are the associated logistical effort and not least by virtually unavoidable ground damage caused high costs, because for the construction of existing mobile cranes, which are needed for the construction of large wind turbines, currently due to the immense crane weight a variety of individual heavy load transports to the most remote installation sites of wind turbines are performed.

The US 3,856,150 describes a crane according to the preamble of claim 1. From the DE 34 41 655 A1 is a tower for cranes, elevators or the like, preferably known for antennas, which has a bracing on an extendable support arm.

The object of the invention is to provide a particular suitable for the installation of wind turbines vehicle crane, which has the lowest possible total weight and can be made ready for use as quickly as possible to keep in this way the Kruutzungskosten as low as possible, but at the carrying capacity or lifting capacity no cuts should be made.

The solution of this object is achieved by the features of claim 1.

The inventive concept of a top-rotating structure with vertical tower and attached boom means a departure from the Previously pursued in mobile cranes design principle, according to which the slewing is at the height of the chassis and the telescopic or trained as a lattice truss mast because of the necessary stability in each operating position inclined to the vertical and provided with a co-rotating counterweight. One speaks in this context of a compulsory discharge. In the vehicle crane according to the invention is such, for mobile cranes typical forced discharge due to the vertical tower does not exist.

It has surprisingly been found that the inventive concept of a non-rotating vertical tower offers a variety of advantages. In particular, since there are no countermeasures because of the lack of compulsory discharge, for example. In the form of heavy counterweights must be taken, a comparatively low - based on the carrying capacity or lifting capacity - realize crane gross weight, which has an advantageous effect on mobility, since only a relatively small number of individual transports is required.

Furthermore, designing the vehicle crane according to the invention as a head turner opens up advantageous possibilities for an optionally required additional securing or stabilization of the tower and also makes it possible to realize a particularly simple concept for erecting the tower. This will be discussed in more detail below.

Advantageous embodiments of the invention are also indicated in the dependent claims, the description and the drawings.

Preferably, the boom is inclined relative to the tower. Among them is also a horizontal course, i. to understand a perpendicular to the tower extending boom.

Furthermore, the boom is preferably variable in length and / or angle-adjustable relative to the tower. To change the length of the boom is preferably formed telescopic.

According to a further preferred embodiment, the boom is a component of a particular transportable as a whole assembly which in addition to the boom in particular a slewing, a luffing, a pulley with lower block and upper pulley and optionally a crane cab and all necessary for this drive means comprises. This assembly comprising the boom can be referred to as a superstructure, although understood in conventional vehicle cranes under the term "superstructure" the entire structure directly on the chassis also referred to as the undercarriage.

According to a further preferred embodiment of the invention, the weight of the tower is provided as a counterweight. Unlike in conventional vehicle cranes, whose always due to the forced discharge mast is associated with the crane gross weight considerably increasing counterweight, can in the vehicle crane according to the invention Even with high load capacity or lifting capacity to be dispensed with such an additional counterweight. It has been found that the stability of the possibly additionally secured vertical tower is sufficient, ie the stability of the vehicle crane according to the invention is at least substantially already given due to the weight of the tower; The vertical tower acts as the central ballast of the mobile crane.

Depending on the specific dimensioning of the vehicle crane according to the invention additional security or stabilization measures can be provided for the tower, which will be discussed in more detail below. However, such measures then contribute, to a much lesser extent, to the overall crane weight than the counterweights of conventional mobile cranes. However, it is not excluded that even in the case of the vehicle crane according to the invention, in particular in the case of very large loads or discharges, one or more additional counterweights are used. As such counterweights, e.g. at least one already existing, coupled for this purpose to the chassis of the vehicle crane according to the invention auxiliary vehicle or auxiliary crane can be used.

Furthermore, the invention proposes that a support is provided for the tower. The support comprises a plurality of floor supports distributed around the tower.

The weight of the tower and the support can be coordinated so that no additional counterweight is required.

According to the invention it is provided that a bracing is provided for the tower. By bracing the bending stiffness of the tower can be increased, since a at a certain height on the tower attacking bracing reduces the incoming in the calculation of the critical bending load with 1 / L ² effective length L of the tower.

The bracing comprises a plurality of around the tower around distributed guy organs are provided in the form of guy ropes.

The possibility of considerably increasing the load capacity of the tower by means of bracing is one of the advantages of the inventive concept of providing a top-tower structure with a vertical tower, since it is not possible to brace it in a bottom-rotating structure.

Since the tower is a telescope tower, the bracing acts on one or more tower segments, also referred to as boxes or shots. Particularly advantageous is a at several tower segments and thus at along the tower spaced locations attacking bracing, as a result, a particularly strong reduction of the effective length of the tower and thus increasing the maximum bending stress of the tower can be achieved. In particular, this can attack the bracing in the region of the upper ends of the respective tower segments which are accessible even when the tower is pushed together. Within the scope of the invention a bracing acting on a plurality of positions spaced along the tower but also provided in connection with a non-telescopic tower.

The guy is connected to a tower support. On additional ground anchors or other anchorages for the bracing can be dispensed with, but according to the invention is not excluded that other anchors are used in addition to an anchorage to the tower support.

Further, a boom is disclosed, which is provided with a counter-jib. Preferably, the counter-jib is adjustable for varying the bending moment acting on it by the tower. For this purpose, the counter-jib in particular variable in length, for example, telescopic, and / or be designed to be angularly adjustable relative to the tower.

With a counter-jib, load-induced bending moments - that is to say over the jib carrying the load to be lifted - acting on the tower can be at least partially compensated. In particular, it can be achieved that the tower is at least largely free of bending moment.

Disclosed is also a control and / or regulating device, by means of which the counter-jib is adjustable in dependence on the instantaneous load torque. As a result, during the crane operation of the tower even with changes in Load situation on the boom are always kept at least substantially free of bending moment by automatically responding to changes in the load situation on the boom by changing the counter-jib adjustment, for example, by length change or angular displacement relative to the tower.

According to a further embodiment of the invention, in particular a pot-shaped or cup-shaped tower receptacle is provided for the lower end of the tower, which connects two spaced chassis parts together. As a result, the tower mount forms a part of the chassis. In the case of a tower in transport position, its lower end is preferably separated from the tower receptacle. This separation of tower and tower mount allows transport with lying on the chassis tower.

Furthermore, it is preferably provided that the tower receptacle is connected to a tower support. As a result, the inclusion of the tower is used at the same time for its support.

Furthermore, the invention proposes that the tower is self-righting. In this case, according to a preferred embodiment of the invention for erecting the tower at least two variable-length adjustment devices are provided which engage at spaced apart along the tower positions.

In particular, the tower is by means of a first adjusting device acting at a distance from the lower tower end from a substantially horizontal transport position in an inclined position and by means of a in the area of the lower tower end attacking second adjustment from the inclined position in the vertical working position can be transferred. It is preferably provided that the tower is forcibly guided in the region of its lower end, in particular in an at least approximately horizontal direction.

The erecting principle according to the invention, in which the tower is not simply pivoted about an axis stationary with respect to the chassis, but the pivotal movement of the tower is also superimposed on a preferably approximately horizontal translational movement, advantageously making it possible to adjust the transport position of the tower relative to the tower Chassis optimally tune to the transport needs, without being set to the required or required for the vertical working position of the lower tower end.

The provision of the so-called "on-board" facilities for erecting the tower does not exclude that especially when designing the vehicle crane according to the invention for very high lifting capacity, the erection of the tower is supported by an external auxiliary device, in particular in the form of an auxiliary crane.

According to a further preferred embodiment of the invention, the tower can be erected with an attached trailer. Depending on the dimensions of the tower and the boom, the tower can be erected with attached boom either alone under its own power or with the assistance of external auxiliary equipment.

It is particularly preferred if, in accordance with a further embodiment of the invention, a retaining device designed in particular as a rigid link is provided, which holds the arm mounted on the tower in an angle-adjustable manner during erection, regardless of the inclination of the tower in an at least approximately horizontal position. As a result, the tower when erecting to a certain extent even ensures that the patch boom remains despite the erecting of the tower increasingly magnifying angle between the tower and boom at least within certain limits in a respective desired position with respect to the chassis. This desired position of the cantilever can also deviate from a horizontal position, although a substantially horizontal orientation of the cantilever is preferred.

Furthermore, it is disclosed that a tower arranged on a chassis designed in particular as a low loader, on the one hand, and a jib, in particular a superstructure comprising the jib, are on the other hand assigned to separate transport units which are in particular permitted in each case for road transport.

It has been found that on the basis of this concept, a sizing of tower and boom or superstructure is sufficient, each of which allows a transport as a whole in accordance with the applicable traffic regulations. Optionally provided additional crane components such as tower support, tower bracing and serving as Aufrichthilfe holding device can be combined to form a single further transport unit.

Such a vehicle crane can consequently be moved on the basis of its low total weight in relation to the carrying capacity or lifting capacity with only three individual transport units. This means only a minimum of logistical effort for the transport to the respective site and at the same time a minimum space required when erecting with a relatively low risk of land damage.

As a result, consequently, the costs for tolling, which have to date been estimated, in particular, for the erection of large wind power plants, can be considerably reduced.

Fig. 1 - 7

ein Ausführungsbeispiel eines erfindungsgemäßen Fahrzeugkrans in verschiedenen Aufbauphasen,

Fig. 8

einen Fahrzeugkran gemäß einem weiteren Ausführungsbeispiel der Erfindung, und

Fig. 9

eine Weiterbildung des Fahrzeugkranes von Fig. 8.

The invention will now be described by way of example with reference to the drawings. Show it:

Fig. 1-7

An embodiment of a vehicle crane according to the invention in various stages of construction,

Fig. 8

a vehicle crane according to another embodiment of the invention, and

Fig. 9

a development of the vehicle crane of Fig. 8 ,

Fig. 1 shows in three different views a part of a vehicle crane according to the invention. The in Fig. 1 The part shown is part of a road transport approved first transport unit comprising a semitrailer, not shown, and a chassis with a coupled to the semitrailer front chassis part 23 a and a rear chassis part 23b includes. In the chassis a the two chassis parts 23a, 23b interconnecting, cup-shaped tower mount 21 is firmly integrated.

The tower receptacle 21, which is provided with a plurality of connection points 41 for attachment of a tower support explained in more detail below, serves to receive the lower end of a in Fig. 1 In this transport position, the tower 11 extends across the tower receptacle 21 away and rests on the chassis 23a, 23b.

The tower 11 is telescoping and comprises in the embodiment shown here five also referred to as boxes or shots tower segments 31, 33, 35, namely a lower tower segment or outer box 35 and four inner tower segments or inner boxes 31, 33, the top or inner tower segment 31 comprises at its free end a head 45, on which a in Fig. 1 not shown assembly can be placed, which comprises a boom and is also referred to below as the superstructure.

For erecting the tower 11, which is described in more detail elsewhere, two adjusting devices 27, 29 explained in more detail below are also used.

A first adjusting device 27 comprises a piston / cylinder pair which is articulated on the one hand on the rear chassis part 23b and on the other at a location remote from the lower end of the tower at the lower tower segment 35 is, in the lying transport position on its side facing away from the chassis upper side.

A second adjusting device 29 comprises a substantially parallel to the horizontal tower 11 extending piston / cylinder arrangement whose cylinder is articulated with a front end to an attachment point 59 on the front chassis part 23a. In the retracted state, the front end 61 of the piston of the piston / cylinder assembly 29 is in the region of the rear end of the tower receptacle 21. About a in Fig. 1 not shown, designed as a yoke pull rod, the front end of the piston 61 is connected to the lower end of the tower, namely at the transport position shown in the chassis lower side. By extending the piston thus the lower turret end can be pulled backwards and over the tower receptacle 21, which will be discussed in more detail below.

To erect the tower 11 is also an in Fig. 1 Not shown holding device provided in the form of a rigid arm, which is also explained in more detail below. The handlebar is attached with one end to the front end of the piston 61 and supports with its other end from the set up of the tower 11 on the head 45 superstructure from.

Furthermore, a substantially horizontally extending positive guide 43 is provided for the lower turret end, which comprises two parallel spaced slots or elongated holes into which the lower turret end engages with corresponding guide projections from the inside.

Fig. 2 shows the aforementioned handlebar 25 connected to the front piston end 61 state. The handlebar 25 extends parallel to the tower 11 and is angled upwards in its pushed together at the tower 11 over the head 45 end portion.

In Fig. 2 In addition, four star support for the vehicle crane or its tower 11 forming extendable floor supports 17 are shown. The floor supports 17 are connected to the above-mentioned connection points 41 with the tower receptacle 21. At their end regions remote from the tower receptacle 21, the floor supports 17 are each provided on one side with a support foot 49 and on the other with two overhead winches 47, which have a braking mechanism based, for example, on a pawl or latching principle. The winches 47 are part of a Turmabspannung explained in more detail below.

Fig. 3 shows the vehicle crane according to the invention with attached superstructure 39. The transported on a further truck, not shown, and thus a second approved for road transport unit uppercarriage 39 has a boom 13 which comprises a telescopic mast with four mast segments 65, 67, 69 in this embodiment , namely an upper pole segment 65 with a lower bottle, not shown, two further inner segments or inner boxes 67 and a lower mast segment 69, which is connected to Wippwerk 55 and slewing 15. In addition to the boom 13, the uppercarriage 39 in this embodiment comprises a crane cab 53, the drive means for the slewing gear 15 and the luffing gear 55 and hoisting winches.

The rigid arm 25 is hinged to the free end of its angled end portion to the rear end portion of the upper carriage 39.

In the position according to Fig. 3 is the upper carriage 39 pivotally connected only on one side with the head 45 about an axis 73, so that in the erection of the tower 11 described below, an angular displacement between the uppercarriage 39 and boom 13 on the one hand and tower 11 on the other hand is possible.

To erect the tower 11 with attached superstructure 39 is first according to Fig. 4 By means of the first adjusting device 27, the tower 11 is transferred from its horizontal transport position into the illustrated inclined position, in which the tower 11 is inclined, for example, at about 45 ° relative to the vertical. Up to this point, the erection movement of the tower 11 is a pure pivotal movement about an axis 71 at the one end of the positive guide 43 for the lower tower end. In the position according to Fig. 4 Thus, the second adjustment device 29 is still in the retracted state. In Fig. 4 is the already mentioned above, in the Fig. 1 to 3 at least largely hidden Zuggestänge or yoke 81 shown.

The rigid arm 25 always holds the boom 13 in an at least substantially horizontal position, despite the tower inclination that changes during erection. In order to achieve for the erection of the tower 11 favorable forces and moments, the inner segment package of the telescopic mast of the boom 13 is according to Fig. 4 extended, whereby the center of gravity of the boom 13 and upper carriage 39 of the pivot axis 73 between uppercarriage 39 and tower 11 is shifted away to the front.

In the in Fig. 5 illustrated state, the tower 11 is in the fully erect condition in which it extends in the vertical direction. The transfer of the tower 11 from the inclined position according to Fig. 4 in the vertical working position by means of the second adjusting device 29, which pulls out by extending the piston for a lower tower end by means of the drawstring or yoke 81 on the tower support 21, where the lower tower end is then attached, for example by bolting, and on the other Lower end of the rigid arm 25 also to the rear - based on the direction of travel of the chassis - presses.

The positions of all effective when erecting the tower 11 pivot axes relative to each other and the lengths of all the components involved are inventively coordinated so that the control movement transmitted by the righting tower 11 via the handlebar 25 on the pivotally mounted on the tower 11 uppercarriage 39 is maintained, the uppercarriage 39 during the entire erection process and thus regardless of the tower inclination always in the at least substantially horizontal desired position.

After the tower 11 is transferred to the vertical working position, is in accordance with Fig. 6 a star-shaped brace 19 installed. In further telescoped telescopic tower 11 are here for each of the four floor supports 17 two guy ropes 19 which are wound on the fortified on the floor supports 17 winds 47, with their free ends at different Tower segments attached, respectively in the upper edge region of the segment.

Clamping devices for tensioning the cables 19 are integrated in the floor supports 17.

The transferred in the manner described above after placing the upper carriage 39 in the vertical working position, supported and guyed tower 11 can now be telescoped after releasing the connection between the rigid arm 25 and upper carriage 39 to the respective desired working length, as in Fig. 7a is shown. The guy ropes 19 are unwound from the winches 47 in accordance with the increasing tower height and can be kept under tension at all times. Simultaneously with the extension of the tower 11 or after reaching the respective working length of the tower 11 of the telescopic mast of the boom 13 can be extended and brought by the luffing 55 in the desired angular position relative to the tower 11 to the mast top in the desired working position with respect to height and reach bring to.

The vehicle crane according to the invention is thus ready for use.

Fig. 7b schematically shows the vehicle crane according to the invention in the immediate vicinity of a tower 57 of a wind turbine to be built. A significant advantage of the vehicle crane according to the invention is that the crane can be positioned relatively close to the tower 57 of the wind turbine due to its vertical tower 11.

Fig. 8 shows a modified compared to the embodiment described above vehicle crane. The modification consists in the provision of an additional counter-jib 37. The counter-jib 37 is like the boom 13 provided with a telescopic mast and by means of a luffing gear 75 relative to the tower 11 angularly adjustable. Furthermore, the counter-jib 37 is provided with a hanging from his mast top over a pulley ballast 77.

The counter-jib 37, including the ballast 77, is dimensioned such that it can compensate load-related bending moments, which act on the tower 11 via the jib 13 carrying the load to be lifted, by means of a corresponding counter-torque. Due to its adjustability in terms of length and angle of the counter-arm 37 can be adapted to varying load or torque situations on the boom side.

Preferably, the vehicle crane according to the invention is provided with a device which determines by means of a suitable sensor the instantaneous load or the instantaneous torque on the boom 13 and based on the counter-jib 37 sets such that the tower 11 at least largely held without bending moment, ie. essentially only in the vertical direction is subjected to pressure. On cantilever side changes can be responded practically delay without delay by appropriate adjustment changes on the counter-jib 37.

The crane according to Fig. 9 is different from the one of Fig. 8 merely by the provision of an additional bracing 79 between the boom 13 and the counter-arm 37. The bracing 79 is variable in length depending on the angle between boom 17 and counter-jib 37, by means of a separate pulley on the counter-jib 37. By bracing 79 rockers 55, 75 are relieved.

The projection of the vehicle crane according to the invention can be limited to the required level for the respective lifting job and thus to the necessary minimum because of the vertical tower 11. Thus, the vehicle crane according to the invention is free of a required in conventional vehicle cranes forced unloading. This makes it possible to use the weight of the tower 11 as a central ballast, at least partially to dispense with the conventional vehicle cranes counterweight and optionally provide for the support 17 of the tower 11 only a comparatively low counterweight. The top-sleeving concept according to the invention makes it possible to provide the bracing 19, by means of which the loading capacity of the tower 11 with respect to the tolerable bending moments is increased, which in turn makes additional weights superfluous. The stability already existing by the vertical tower 17 itself requires - if any - only a comparatively small counterweight for the support 17 of the tower 11.

The invention thus provides a vehicle crane, which in terms of its capacity or lifting capacity has a low overall weight and a small footprint and thus relatively quickly and easily moved in the street and can be made operational on site. This results in a huge reduction in Krusutzungskosten.

In principle, the vehicle crane according to the invention can be scaled arbitrarily with regard to its design, in particular with regard to the dimensions and the weight of its components. Preferably, the vehicle crane according to the invention is designed so that it is suitable for the construction of wind turbines.

For the construction of currently existing wind turbines, which have a hub height of about 85 - 100m and in which the loads to be lifted are up to about 52t, it is provided according to a possible embodiment that the tower 11 has a weight of about 60t and a length in the extended state of about 70m, wherein the upper carriage 39 has a weight of about 60t and the boom 13 in the extended state has a length of about 60m. The span of the star-shaped support 17, i. the length of the floor supports in the extended state, is in each case about 18m.

Future wind turbines will have a hub height of about 145m and lifting loads on the order of 240t, according to existing plans. Also, such wind turbines can be easily installed with a relation to the above-mentioned interpretation according to the invention enlarged vehicle crane. If necessary, this is the variant with counter jib 37 according to Fig. 8 or 9 be used.

LIST OF REFERENCE NUMBERS

11

tower

13

boom

15

slewing

17

Support, floor support

19

Bracing, guy rope

21

tower admission

23a

front chassis part

23b

rear chassis part

25

Holding device, rigid handlebar

27

first adjusting device

29

second adjustment

31

Upper tower segment

33

Intermediate segment of the tower

35

lower tower segment

37

counter-jib

39

superstructure

41

junction

43

forced control

45

head

47

Winch with brake mechanism

49

Support foot

53

cabin

55

Boom elevation

57

Tower of a wind turbine

59

fastening point

61

front piston end

65

upper pole segment

67

Intermediate segment of the jib

69

lower pole segment

71

Swivel axis for lower tower end

73

Swivel axis between boom and tower

75

Boom elevation

77

ballast

79

guying

81

Drawbar, yoke

Claims (14)

1. A vehicle crane, in particular a mobile crane, truck-mounted crane or crawler crane, comprising a mounting which is configured as a top slewing crane and comprises a vertical tower (11) and a jib (13) on the tower (11), wherein the tower (11) is telescopic, wherein a support is provided for the tower (11) and comprises a plurality of ground supports (17) which are distributed around the tower, wherein a bracing (19) is provided for the tower (11) and comprises a plurality of bracing units in the form of bracing cables (19) which are distributed around the tower (11), characterised in that the bracing (19) attaches at one or more tower segments, wherein the bracing cables (19) are unwound, in accordance with the increasing height of the tower, from winches (47) fastened to the ground supports (17) and can thus be kept constantly tensed.
2. The vehicle crane according to claim 1, characterised in that the jib (13) is inclined with respect to the tower (11).
3. The vehicle crane according to claim 1 or 2, characterised in that the jib (13) is variable in length, preferably telescopic, and/or can be angularly adjusted relative to the tower (11).
4. The vehicle crane according to any one of the preceding claims, characterised in that the inherent weight of the tower (11) is provided as a counterweight.
5. The vehicle crane according to claim 4, characterised in that the support (17) and the inherent weight of the tower (11) are adjusted to each other, such that an additional counterweight is not required.
6. The vehicle crane according to any one of the preceding claims, characterised in that the jib (13) is provided with a counter jib (37), wherein the counter jib (37) can preferably be set in order to vary the bending moment acting on the tower (11) through the counter jib (37) and is in particular variable in length, preferably telescopic, and/or can be angularly adjusted relative to the tower (11).
7. The vehicle crane according to claim 6, characterised in that load-related bending moments can be compensated for by means of the counter jib (37), preferably such that the tower (11) is at least largely free of bending moments, wherein a control and/or regulating device is preferably provided, by means of which the counter jib (37) can be set in accordance with the current load torque.
8. The vehicle crane according to any one of the preceding claims, characterised in that a tower receiver (21) which is in particular cup-shaped or bowl-shaped is provided for the lower end of the tower (11) and connects two spaced bogie parts (23a, 23b) to each other, wherein the lower end of the tower (11) is separated from the tower receiver (21) when the tower (11) is situated in its transport position.
9. The vehicle crane according to claim 8, characterised in that the tower receiver (21) is connected to a tower support (17).
10. The vehicle crane according to any one of the preceding claims, characterised in that the tower (11) is configured to be self-erecting.
11. The vehicle crane according to any one of the preceding claims, characterised in that at least two variable-length adjusting devices (27, 29) which attach at positions spaced along the tower (11) are provided for erecting the tower (11).
12. The vehicle crane according to any one of the preceding claims, characterised in that the tower (11) can be conveyed from a substantially horizontal transport position to an oblique position by means of a first adjusting device (27) which attaches at a distance from the lower end of the tower, and can be conveyed from the oblique position to the vertical working position by means of a second adjusting device (29) which attaches in the region of the lower end of the tower, wherein the tower (11) is positively guided in the region of its lower end.
13. The vehicle crane according to any one of the preceding claims, characterised in that the tower (11) can be erected with the jib (13) placed on it, in particular erected together with the superstructure (39) which comprises the jib (13).
14. The vehicle crane according to any one of the preceding claims, characterised in that a holding device (25) is provided which is configured as a rigid guider and keeps the jib (13), which is placed on the tower (11) in such a way that it can be angularly adjusted, in an at least approximately horizontal position when the tower (11) is being erected, independently of the inclination of the tower.

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