Vehicle crane comprising mounting framework and method for mounting bracing apparatus on telescoping jib

Abstract

To provide: a vehicle crane comprising a mounting framework with an optimized temporary storage option for a bracing apparatus; and an optimized method for mounting a bracing apparatus on a telescoping jib of a vehicle crane.SOLUTION: A vehicle crane comprises a mounting framework, where at least one bracing arm 9a, 9b of a bracing apparatus of the vehicle crane can be temporarily stored on the mounting framework. The mounting framework comprises at least one displaceable sliding frame 11c, 11j, and a single bracing arm 9a, 9b can be temporarily stored on the sliding frame 11c, 11j. The mounting framework is arranged on the extension of a lower carriage 4 of the vehicle crane and completely behind the lower carriage 4 and is fastened to the lower carriage 4 to provide a vehicle crane with an optimized temporary storage option for the bracing apparatus on the lower carriage.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a vehicle crane with a mounting frame in which at least one bracing arm of a bracing device of the vehicle crane can be temporarily stored, the mounting frame comprising at least one displaceable sliding frame in which a single bracing arm can be temporarily stored. The present invention also relates to a method for mounting a bracing device on a telescopic jib of a vehicle crane. [Background technology]

[0002] German patent specification DE 10 2021111 922 B3 already discloses a mounting and transport frame for two bracing arms, which can be attached to the telescopic jib of a vehicle crane to increase the load-bearing capacity. The bracing arms are attached to the same mounting and transport frame for transport on the low-bed loader, for transport between the low-bed loader and the vehicle crane and for preparation for attachment to the vehicle crane. The mounting and transport frame essentially consists of a base frame having a left frame part with a support leg for receiving the first bracing arm and a right frame part with a support leg for receiving the second bracing arm. The right and left frame parts are movably and displaceably arranged relative to each other on the base frame so that they can be moved from a narrow transport position to a wide mounting position and vice versa as required. In the case of transport on the low-bed loader, the mounting and transport frame is arranged on the low-bed loader with the supported first and second bracing arms and the frame part is arranged in the narrow transport position. To attach the first and second bracing arms to the telescopic jib of the vehicle crane, the mounting and transport frame is lifted by the telescopic crane with the two bracing arms to the mounting surface of the lower carriage of the vehicle crane and bolted to this position. In one variant, the two bracing arms are then moved away from each other from the narrow transport position to the wide mounting position. The telescopic jib is then luffed down and introduced between the two bracing arms, and the two bracing arms are individually fastened to the telescopic jib, and then each is removed from the mounting and transport frame. In a typical manner, the telescopic jib is then erected, the bracing arms are unfolded and the bracing is fastened. During the operation of the vehicle crane, the mounting and transport frame can remain on the lower carriage and can be used as a storage place for the bracing arms if necessary.

[0003] European patent specification EP 2 248 754 B1 discloses another vehicle crane with a bracing arm that can be attached by the vehicle crane itself. In this case, the two bracing arms are also transported to the placement site of the vehicle crane by a separate low-bed loader. The bracing arms are connected at one end via a U-shaped retaining frame to form a structural unit, and at the opposite ends are each provided with a removable and length-variable foot support. To attach the bracing arms to the telescopic jib of the vehicle crane, the structural unit is lifted from the low-bed loader by the telescopic jib of the vehicle crane and placed behind the lower carriage of the vehicle crane on the extension of the lower carriage. In this case, the length-variable foot support rests on the ground and the removable foot support rests in the area of ​​the U-shaped retaining frame retaining frame of the lower carriage. Again, after the telescopic jib has been inserted between the two bracing arms, the bracing arms are fixed to the telescopic jib via the retaining frame and the removable foot support is removed from the retaining frame. The length-variable foot support remains on the bracing arm.

[0004] Furthermore, European patent specification EP 1 342 692 B1 discloses a further vehicle crane, the two bracing arms of which are also transported to the placement site on a low-bed loader separately from the vehicle crane. Upon arrival at the placement site, the bracing arms are lifted from the low-bed loader by the vehicle crane and temporarily stored in the lower carriage of the vehicle crane. For this purpose, four-foot-like brackets are arranged on the lower carriage, on which the two bracing arms of the bracing device are placed. The telescopic jib of the vehicle crane is then luffed down to an approximately horizontal receiving position between the two bracing arms and the bracing arms are coupled to the telescopic jib. Summary of the Invention

[0005] It is therefore an object of the present invention to provide a vehicle crane with a mounting frame with an optimized temporary storage option for the bracing device and to provide an optimized method for mounting the bracing device to the telescopic jib of the vehicle crane.

[0006] This object is achieved by a vehicle crane with a mounting frame having the features of claim 1 and by a method for mounting a bracing device on a telescopic jib of a vehicle crane having the features of claim 5. Each of the dependent claims describes advantageous embodiments of the invention.

[0007] According to the invention, in the case of a vehicle crane with a mounting frame, on which at least one bracing arm of the bracing device of the vehicle crane can be temporarily stored, the mounting frame comprises at least one displaceable sliding frame, on which a single bracing arm can be temporarily stored, and the mounting frame is arranged in the extension of the lower carriage of the vehicle crane and completely behind the lower carriage and fixed to the front or rear of the lower carriage, thereby achieving an optimal temporary storage option of the bracing device. The mounting frame is thus held at the lower carriage, i.e. at the front or rear of the lower carriage, oriented relative to the lower carriage and not supported on the surface or top surface of the lower carriage. The mounting frame is supported at the front or rear of the lower carriage via a single-shear, preferably multiple-shear, bolted projection or bracket attached to the lower carriage. This front or rear of the lower carriage is usually oriented vertically. In the context of the present invention, going completely behind the lower carriage in the longitudinal direction of the lower carriage is understood to mean going in front of or behind the lower carriage.

[0008] In an advantageous manner, the mounting frame is supported on the ground via support legs at its rear end remote from the lower carriage and is connected at its opposite front end to the rear end of said lower carriage.

[0009] In a structurally preferred embodiment, the mounting frame comprises a base frame, an intermediate frame, a first sliding frame and a second sliding frame, the intermediate frame being arranged on the base frame and the two sliding frames being arranged on the intermediate frame so as to be displaceable independently of each other.

[0010] In an advantageous manner, starting from a fully retracted receiving position, the first sliding frame can be displaced only in a first direction and displaced back again, and starting from a fully retracted receiving position, the second sliding frame can be displaced in a second direction opposite to the first direction and displaced back again.

[0011] Typically, the vehicle crane comprises a lower carriage, a superstructure, and a telescopic jib. The telescopic jib comprises a base box with an extendable inner box, and a bracing device having a first bracing arm and a second bracing arm can be mounted on the telescopic jib, and for mounting purposes, the first bracing arm and the second bracing arm can be mounted on a mounting frame one by one.

[0012] According to the present invention, an optimized method for mounting a bracing device on a telescopic jib of a vehicle crane and an optimized temporary storage option for the bracing device is achieved by the following steps: Providing a first transport unit in the area of ​​the vehicle crane, the first transport unit having a mounting frame adapted to be received in the first transport unit; Raising the mounting frame from the first transport unit relative to a baggage hook by the vehicle crane; aligning the mounting frame in line with an extension of a lower carriage of the vehicle crane; securing the mounting frame to the undercarriage and fully rearward of the undercarriage and removing the vehicle crane from the mounting frame relative to a load hook; Providing a second transport unit having the bracing device within the area of ​​the vehicle crane, the bracing device being received by the second transport unit and including a first bracing arm and a second bracing arm; Raising the first bracing arm from the second transport unit relative to a load hook by the vehicle crane; lowering and placing the first bracing arm of the bracing device onto a first sliding frame of the mounting frame by the vehicle crane; lowering and placing the first bracing arm of the bracing device onto a first sliding frame of the mounting frame relative to a luggage hook by the vehicle crane; Raising the second bracing arm from the second transport unit by the vehicle crane; lowering and placing the second bracing arm of the bracing device on a second sliding frame of the mounting frame relative to a luggage hook by the vehicle crane; In either case, displacing the second sliding frame in a second direction of the mounting direction from a retracted receiving position to a laterally extending lowered position; luffing the telescoping jib between the first bracing arm and the second bracing arm; Displacing the first and second sliding frames in the mounting direction from the lowered position to a central fixed position, in which the fixing frames of the first and second bracing arms abut against the basic box of the telescopic jib in each case; Fixing the first bracing arm and the second bracing arm together with the fixing frame to the basic box. [Brief description of the drawings]

[0013] Exemplary embodiments of the invention are explained in more detail with reference to the following description.

[0014] [Figure 1] FIG. 1 shows a perspective view of a vehicle crane system consisting of a vehicle crane and two transport units. [Diagram 2] FIG. 2 shows a perspective view of the vehicle crane shown in FIG. 1 and a first transport unit with a raised mounting frame. [Diagram 3] FIG. 3 shows a schematic and perspective view of the vehicle crane shown in FIG. 2 with the mounting frame installed. [Figure 4] FIG. 4 shows a detailed perspective view of the mounting frame attached to the vehicle crane shown in FIG. [Diagram 5] FIG. 5 shows a perspective view of the second transport unit shown in FIG. [Figure 6] FIG. 6 shows a perspective view of the vehicle crane shown in FIG. 1 and a second transport unit with the bracing arm raised. [Figure 7] FIG. 7 illustrates a perspective view of the vehicle crane shown in FIG. 5 with the first bracing arm mounted on the mounting frame and the second bracing arm elevated. [Figure 8] FIG. 8 shows a detailed perspective view of the mounting frame with the first bracing arm and the second bracing arm shown in FIG. [Figure 9] FIG. 9 shows a side perspective view of the vehicle crane with the telescoping jib lowered. [Figure 10] FIG. 10 illustrates an enlarged portion of a plan view of the first bracing arm and the second bracing arm shown in FIG. 8, each in a lowered position. [Figure 11] FIG. 11 is an enlarged cross-sectional view of the portion shown in FIG. 10 with the first bracing arm and the second bracing arm in their respective locked positions. [Figure 12] FIG. 12 shows a perspective view of a vehicle crane with two bracing arms attached for reinforcement.

[0015] First, the method of attaching the first bracing arm 9a and the second bracing arm 9b of the bracing device 9 to the telescopic jib 6 of the vehicle crane 2, and the mounting frame 11 used for this purpose, will be explained in more detail below with reference to the drawings.

[0016] FIG. 1 shows a perspective view of a vehicle crane system 1 with a vehicle crane 2 and a first transport unit 3a and a second transport unit 3b, each of which is installed on a ground surface U. The first transport unit 3a and the second transport unit 3b are typically designed as trailer trucks with trailers. Such a vehicle crane system 1 is necessary because the weight of the vehicle crane 2 itself is very high, so that the vehicle crane 2 must usually be driven to the respective installation site in a partially disassembled state in order to be able to comply with the maximum values ​​prescribed for the public road network with regard to axle loads and vehicle weights. Therefore, further accessories of the vehicle crane 2, such as a strut device 9 for increasing the load-bearing capacity of the vehicle crane 2, a telescopic jib extension, the entire telescopic jib 6 or counterweights, are often transported separately on the transport units 3a, 3b.

[0017] A road-going vehicle crane 2 typically comprises a multi-axle undercarriage 4 with pneumatically tyred wheels 5. On the undercarriage 4, a superstructure 7 is arranged, on which a telescopic jib 6 is mounted and which can be swiveled about a vertical axis relative to the undercarriage 4. The telescopic jib 6 comprises a basic box 6a connected to the superstructure 7, which can be swiveled about a horizontal axis in the region of the telescopic jib foot 6c of the telescopic jib 6, and which receives several linearly telescopic inner boxes 6b, of which only the first one 6b is shown. On the free end of the telescopic jib 6, in particular on a telescopic jib head 6d arranged on the innermost one of the inner boxes 6b, a lifting cable 8 runs, on which a load pick-up means, such as a load hook with a lower block for a cable reeving device, is suspended.

[0018] The two transport units 3a, 3b each have a loading surface 3c which is typically part of a low bed loader.

[0019] The mounting frame 11 is transported by the first transport unit 3a. The mounting frame 11 has the function of an auxiliary frame used when attaching the first and second support arms 9a, 9b to the telescopic jib 6. The mounting frame 11 mainly consists of a lower base frame 11a in the shape of a lattice-like mast section, a central intermediate frame 11b, an upper first right sliding frame 11c, and an upper second left sliding frame 11j (see FIG. 4), and serves to extend the lower carriage 4 and provide an option to temporarily store the two support arms 9a, 9b.

[0020] A bracing device 9 for the telescopic jib 6 is transported on the loading surface 3c of the second transport unit 3b as an attachment to the vehicle crane 2. Such a bracing device 9 is known to increase the load-bearing capacity of the vehicle crane 2, to provide rear and side supports for the telescopic jib 6 and to reduce the elastic sagging of the telescopic jib 6 during operation of the vehicle crane 2. For this purpose, the bracing device 9 is usually attached to the basic box 6a of the telescopic jib 6, in one embodiment in the area of ​​the upper collar 6e. The bracing device 9 consists of a first bracing arm 9a and a second bracing arm 9b which are connected to the telescopic jib 6 and can be spread out backwards in a V-shape to the operating position (see FIG. 12). The first and second bracing arms 9a, 9b are also provided in the middle and lower regions with tensioning mechanisms 9d in the form of cable winches for appropriately tensioning the associated strut cables 12a and tensioning means such as strut rods 12b (see FIG. 12) of the struts. In the second transport unit 3b, the two bracing arms 9a, 9b are in a horizontal, parallel and spaced apart transport position. In the transport position, the two bracing arms 9a, 9b are oriented such that their longitudinal direction is substantially parallel to the longitudinal direction of the second transport unit 3b. Furthermore, the two bracing arms 9a, 9b are preferably arranged as close as possible to each other on the loading surface 3c so as not to protrude laterally beyond the loading surface. In the mounting position of the two bracing arms 9a, 9b on the telescopic jib 6, the two bracing arms 9a, 9b are arranged adjacent to each other and the distance between the two bracing arms 9a, 9b is greater than in the transport position and adapted to the width of the telescopic jib 6. The two bracing arms 9a, 9b are arranged on the loading surface 3c in a common transport frame 10 adapted to the shape of the two bracing arms 9a, 9b and fixed in this position for transport purposes. The transport frame 10 is formed integrally for both bracing arms 9a, 9b.

[0021] FIG. 2 shows yet another three-dimensional view of the vehicle crane 2 and the first transport unit 3a shown in FIG. 1. At the start of the so-called rigging procedure, which involves the attachment of the first bracing arm 9a and the second bracing arm 9b to the telescopic jib 6, the first transport unit 3a is oriented relative to the vehicle crane 2 such that its longitudinal direction is in the extension of the vehicle crane 2 relative to the longitudinal direction of the vehicle crane 2. In this case, a distance remains between the vehicle crane 2 and the first transport unit 3a. Furthermore, in this case, the rear end 4a of the undercarriage 4, which is opposite the cab 4b of the vehicle crane 2, and the rear end 3d of the second transport unit 3b face each other, so that the loading surface 3c of the first transport unit 3a faces the vehicle crane 2. Alternatively, the vehicle crane 2 can be correspondingly oriented relative to the first transport unit 3a. Once oriented, in a next rigging step, the mounting frame 11 can be lifted from the loading surface 3c by the vehicle crane 2 and the first transport unit 3a can be moved.

[0022] In the next step, as shown in FIG. 3, which shows a schematic and perspective view of the mounting frame 11 mounted on the vehicle crane 2 shown in FIG. 2, it is clear that the mounting frame 11 is moved by the vehicle crane 2 to a fixed position on the rear end 4a of the lower carriage 4. In this connected position, the front end 11e of the mounting frame 11 abuts on the rear end 4a of the lower carriage 4. The mounting frame 11 is lowered by the vehicle crane 2 so that the upper surface of the mounting frame 11 is approximately at the same level with the surface of the lower carriage 4, and the mounting frame 11 extends the bearing surfaces of the two bracing arms 9a, 9b of the lower carriage 4. In this connected position, the mounting frame 11 is fixed to the lower carriage 4, in particular by bolts. A support leg 11d, the length of which can be changed, is also arranged on the lower carriage 4. On the opposite side, i.e. on the free rear end 11f of the mounting frame mounting frame 11, the support leg 11d is arranged on the lower carriage 4. on the opposite side, i.e. on the free rear end 11f of the mounting frame mounting frame 11, in order to support the mounting frame 11 on the ground U. The vehicle crane 2 or its lifting cable 8 can then be removed from the mounting frame 11 and made available for the next mounting procedure.

[0023] FIG. 4 is a detailed perspective view of the mounting frame 11 shown in FIG. 3, which is already fixed to the lower carriage 4 of the vehicle crane 2. In contrast to FIG. 3, in a further rigging step, the lifting cables 8 have been removed from the mounting frame 11. The structure of the mounting frame 11 is described in more detail below with reference to FIG. 4. The mounting frame 11 is substantially composed of a lower base frame 11a, an intermediate frame 11b, an upper first sliding frame 11c, an upper second sliding frame 11j and a support leg 11d. The base frame 11a has a lattice or frame structure and can have a triangular, square or polygonal cross section. In this case, the base frame starts from its rear end 11f with a flat rectangular cross section, which continues constant for about two-thirds of the length of the mounting frame 11 before tapering to a symmetrical trapezoidal cross section. The base frame 11a has the shape of a substantially flat rectangular parallelepiped. The base frame 11a also has a longitudinal direction G, which, at the connection position of the mounting frame 11, is oriented in extension with respect to the longitudinal direction L of the lower carriage 4. The longitudinal direction G is therefore shown centrally with respect to the symmetrical base frame 11a in FIG. 4 and also corresponds to the center line GM of the mounting frame 11. The length of the base frame 11a is selected so that the first and second bracing arms 9a, 9b can be placed on the mounting frame 11 one after the other in time, so that the vehicle crane 2 with its lowered telescopic jib 6, in particular its basic box 6a, can move next to the bracing arms 9a, 9b which are respectively raised (see FIG. 9). The intermediate frame 11b is fixed in position to the base frame 11a, preferably welded or screwed, and supports first and second sliding frames 11c, 11j with two support elements 11h spaced apart from each other in the longitudinal direction G for one of the two bracing arms 9a, 9b.

[0024] The intermediate frame 11b is designed as two intermediate frame sections spaced apart from each other in the longitudinal direction G of the mounting frame 11. Each intermediate frame section is designed as a double telescopic slide-out or double telescopic rail. For this purpose, each intermediate frame section is equipped with a central beam fixed to the base frame 11a. The telescopic slide-out for the second sliding frame 11j, which is U-shaped in plan view, is fixed to the two inner central beams facing each other. Another telescopic slide-out for the first sliding frame 11c, which is rectangular in plan view, is fixed to the outer side of the central support, which do not face each other.

[0025] The base frame 11a, the intermediate frame 11b and the two sliding frames 11c and 11j are fixed to each other to form a structural unit. Each of the two sliding frames 11c and 11j has four leg-like support elements 11h arranged at the corners of an imaginary rectangle. Two of these support elements are spaced apart from each other in the longitudinal direction G and are designed to firmly position one of the two bracing arms 9a, 9b with its leg 9f (see Fig. 9). The leg-like support elements 11h of the mounting frame 11 are adapted to the shape of the leg 9f of the bracing arms 9a, 9b.

[0026] Each of the two sliding frames 11c, 11j can be moved horizontally linearly, in the mounting direction M, starting from the center line GM in a first direction R1 or in a second direction R2, relative to the base frame 11a, along the intermediate frame 11b, thereby orienting or disengaging the bracing arms 9a, 9b received by it laterally relative to the pick-up telescopic jib 6. The first sliding frame 11c can be moved relative to the base frame 11a from a fully retracted receiving position in the area of ​​the center line GM to a lowered position extended laterally fully to the right in the first direction R1, and a central fixed position. Also, the second sliding frame 11j can be moved relative to the base frame 11a from a fully retracted receiving position in the area of ​​the center line GM to a lowered position extended laterally fully to the left in the second direction R2, and a central fixed position. In the retracted receiving position, the sliding frame 11c and the support element 11h are oriented with an offset to the right and left, respectively, relative to the center line GM, so that the inner edges of the first and second sliding frames 11c, 11j are located in the area of ​​the center line GM. For the movement movement of the first sliding frame 11c and the second sliding frame 11j, respectively, a first hydraulic cylinder 11g and a second hydraulic cylinder 11k are arranged between the base frame 11a and the sliding frames 11c, 11j. It is clear that the first and second hydraulic cylinders 11g, 11k, respectively, can be replaced by other suitable drives or combinations thereof. The assigned hydraulic cylinders 11g, 11k allow the sliding frames 11c, 11j to be moved independently of each other. From the receiving position adjacent to the center line GM, the first sliding frame 11c can only be moved to the right, relative to the intermediate frame 11b, as viewed in the direction of the vehicle crane 2. This means that only the first bracing arm 9a on the right side can be moved together with the first intermediate frame 11b on the base frame 11a from the first sliding frame 11c to the lowered and fixed position required for the right-hand mounting of the basic box 6a, thus in the first direction R1. In the inner receiving position, one of the two bracing arms 9a, 9b, in this case the first bracing arm 9a on the right side, is placed on the mounting frame 11 by the vehicle crane 2.In the lowered position, the attached bracing arms 9a, 9b are moved laterally or to the right on the outside to such an extent that the telescopic jib 6 can be lowered next to or to the height of the bracing arms 9a, 9b without colliding with the respective bracing arms 9a, 9b. Then, from the lowered position, the bracing arms 9a, 9b can be moved in the direction of the telescopic jib 6 to a fixed position, where the bracing arms 9a, 9b abut against the basic box 6a and can be fixed in that position. Furthermore, the first and second sliding frames 11c, 11j can be adjacent to each other in their respective inner receiving positions.

[0027] The same applies to the second sliding frame 11j and the second bracing arm 9b. Then, a displacement movement in the second direction R2 and to the left is performed accordingly. The first direction R1 and the second direction R2 are opposite to each other.

[0028] The two sliding frames 11c, 11j can be moved synchronously or alternately in time. The same applies for the fastening of the bracings 9a, 9b to the basic box 6a.

[0029] Furthermore, in Fig. 4, a pair of support legs 11d, the length of which can be varied in the vertical direction, is arranged at the rear end 11f. The two support legs 11d are arranged opposite each other and spaced apart from each other in the longitudinal direction G. The two support legs 11d together with the assigned holding frame 11i also form a structural unit which can each be fixed to a suitable base frame 11a. The support legs 11d are preferably an integral part of the mounting frame 11.

[0030] FIG. 5 is a perspective view of the second transport unit 3b shown in FIG. 1. It is clear that a single U-shaped transport frame 10 rests on the loading surface 3c with two received bracing arms 9a, 9b. The transport frame 10 has four leg-like transport supports 10a at each corner of an imaginary rectangle for receiving the first bracing arm 9a and the second bracing arm 9b, two of which are spaced apart from each other in the longitudinal direction of the loading surface 3c and are designed to ensure that one of the two bracing arms 9a, 9b rests on its leg 9f (see FIG. 9). The leg-like transport supports 10a of the transport frame 11 are adapted to the shape of the legs 9f of the bracing arms 9a, 9b.

[0031] After the mounting frame 11 has been fixed to the lower carriage 4, in a next rigging step one of the two bracing arms 9a, 9b is transported to the lower carriage 4. For this purpose, as is clear from FIG. 6, a perspective view of the vehicle crane 2 shown in FIG. 1 and the second transport unit 3b with the first bracing arm 9a raised is shown, the second transport unit 3b being initially oriented relative to the vehicle crane 2 such that its longitudinal direction is in an extended position relative to the longitudinal direction of the vehicle crane 2. As previously mentioned with reference to FIG. 2, in this case a distance remains between the vehicle crane 2 and the second transport unit 3b. Furthermore, the rear end 11f of the mounting frame 11 and the rear end 3d of the second transport unit 3b face each other in such a way that the loading surface 3c of the second transport unit 3b faces the vehicle crane 2. Alternatively, the vehicle crane 2 can also be oriented in a corresponding way relative to the second transport unit 3b. After orientation, in the next rigging step, only the first bracing arm 9a of the two bracing arms 9a, 9b is lifted from the second transport unit 3b and the transport frame 10 by the vehicle crane 2. The first bracing arm 9a is usually lifted by winding the lifting cable 8, luffing the telescopic jib 6 or extending the inner box 6b, or a combination of these. Before lifting, the lifting cable 8 is usually connected to the first bracing arm 9a. In this case, the transport frame 10 remains on the loading surface 3c of the second transport unit 3b, and the second bracing arm 9b remains on the transport frame 10 on the second transport unit 3b.

[0032] FIG. 7 shows a perspective view of the subsequent rigging state of the vehicle crane 2 shown in FIG. 6. It is clear that the first bracing arm 9a is already placed on the sliding frame 11c of the mounting frame 11, in particular on the four support elements 11h in their position. For this purpose, the first sliding frame 11c is placed in the inner receiving position and then pushed rightward and outward in the first direction R1 into the lowered position (see FIG. 4). Basically, it is also possible that the first sliding frame 11c still remains in the receiving position, since there is enough space, the second bracing arm 9b is placed adjacent to the second sliding frame 11j in the receiving position. The second bracing arm 9b is then lifted from the second transport unit 3b and moved by the vehicle crane 2 in the direction of the mounting frame 11. The second bracing arm 9b is suspended from the vehicle crane 2 above the second sliding frame 11j (see FIG. 4). In anticipation of the second bracing arm 9b, the second sliding frame 11j is placed in its inner receiving position.

[0033] FIG. 8 is a perspective view showing in detail the mounting frame 11 shown in FIG. 4 together with the first and second bracing arms 9a, 9b. Following the rigging state shown in FIG. 7, the second bracing arm 9b is placed on the second sliding frame 11j, the lifting cable 8 is removed from the second bracing arm 9b, and then the second sliding frame 11j together with the second bracing arm 9b is moved from the inner / center or left side receiving position in the second direction R2 to the left outside lowered position. If necessary, the same can be performed at this time or in advance for the first bracing arm 9a. Both bracing arms 9a, 9b are placed in their outer lowered position. When the two bracing arms 9a, 9b are each placed in this lateral lowered position, the telescopic jib 6 can be lowered to a substantially horizontal receiving position between the two bracing arms 9a, 9b, so that the basic box 6a is placed at the same height as the fixing frame 9e of the first bracing arm 9a.

[0034] FIG. 9 is a detailed perspective view of the vehicle crane 2 with the mounting frame 11 and the first and second bracing arms 9a, 9b received. In comparison with FIG. 8, the telescopic jib 6 has been lowered to an approximately horizontal receiving position between the first and second bracing arms 9a, 9b. Neither the first bracing arm 9a nor the second bracing arm 9b in the lowered position prevents the lowering of the basic box 6a to its receiving position. Between the basic box 6a and the first bracing arm 9a there is sufficient free space of at least 100 mm, up to 1000 mm, preferably 400 mm to 800 mm, for the lowering. FIG. 9 also shows that the inner box 6b has been retracted in order to lower the telescopic jib 6.

[0035] FIG. 9 particularly clearly shows the arrangement of the mounting frame 11, which is arranged completely behind the lower carriage 4, on the extension of the lower carriage 4 of the vehicle crane 2. The lower carriage 4 is shown in simplified cuboid shape and therefore has a rear end 4a oriented substantially perpendicularly to the ground U, and is therefore also called the rear wall. The same applies to the front end of the lower carriage 4, above which the vertical front wall of the lower carriage 4 is found. Alternatively, the mounting frame 11 can also be arranged in this position. The actual fastening of the mounting frame 11 to the lower carriage 4, and thus the orientation of the lower carriage 4 in the longitudinal direction L and in the height direction, is carried out via a bolt connection 13, which is designed as a single- or multiple-shear bolt connection. Such a bolt connection 13 usually consists of a projection with a hole on the components to be connected to each other, in this case the lower carriage 4 and the mounting frame. For the connection, the projection is aligned with the hole and is connected to each other via a bolt inserted into the hole, which is flush with the hole. The protrusions are located on the one hand on the rear wall of the lower carriage 4 and on the other hand on the four front ends 11e of the mounting frame. The mounting frame 11 is thus fixed to the lower carriage 4. The mounting frame 11 is therefore not supported on the surface or upper side of the lower carriage 4 but is located completely behind the lower carriage. The mounting frame 11 is supported on the rear end 4a or the front end of the lower carriage 4.

[0036] FIG. 10 shows an enlarged portion of the plan view of the first bracing arm 9a and the second bracing arm 9b shown in FIG. 8, in each case in the lowered position on the mounting frame 11. In this case, the first bracing arm 9a is located with its fixing frame 9e laterally adjacent to and at a certain distance from the collar 6e of the basic box 6a of the telescopic jib 6. The same applies to the second bracing arm 9b, but the second bracing arm 9b is arranged on the opposite side of the first bracing arm 9a with respect to the telescopic jib 6. Both bracing arms 9a, 9b in FIG. 10 are located at a certain distance from the telescopic jib 6. The first bracing arm 9a and the second bracing arm 9b run approximately parallel to the telescopic jib 6, and the respective fixing frame 9e is located in front of the collar 6e of the basic box 6a, as shown in the side view.

[0037] FIG. 11 is an enlarged cross-sectional view of the section shown in FIG. 10, showing the state in which the first bracing arm 9a and the second bracing arm 9b are respectively in the fixed position. For this, the first sliding frame 11c and the second sliding frame 11j together with the first bracing arm 9a and the second bracing arm 9b, respectively, are moved from the lowered position to the inside of the basic box 6a, and the fixed frame 9e abuts against the collar 6e of the basic box 6a. Then, the two sliding frames 11c, 11j are arranged with the first bracing arm 9a and the second bracing arm 9b, respectively, in the central fixed position. The first bracing arm 9a and the second bracing arm 9b are then fixed to the basic box 6a, in particular by bolts. The telescopic jib 6 is then lifted upwards, lifting the first bracing arm 9a and the second bracing arm 9b from the mounting frame 11.

[0038] FIG. 12 shows a perspective view of the working state of the vehicle crane 2 with the bracing device 9 to which the two bracing arms 9a, 9b are attached. After the two bracing arms 9a, 9b are attached to the telescopic jib 6 as described above, the bracing arms 9a, 9b are erected and braced in a known manner. For this, in a first step, the bracing cables 12a are respectively led from the tensioning mechanisms 9d via the deflection rollers 9i arranged at the tips 9c of the respective bracing arms 9a, 9b (see FIG. 9) to the telescopic jib head 6d, where the bracing cables 12a are fixed. In a next step, a number of bracing rods 12b arranged one behind the other are arranged between the legs 6c of the telescopic jib and the tips 9c of the respective bracing arms 9a, 9b. Instead of the strut rods 12b, cables or chains including the bracing rods 12b, or a combination thereof, can also be used. The tensioning mechanism 9d is arranged under each of the bracing arms 9a, 9b, starting from the center of the longitudinal extension of the bracing arms 9a, 9b and offset towards the fixed frame 9e. As mentioned above, the fixed frame 9e serves to fix the bracing arms 9a, 9b to the basic box 6a. The fixed frame 9e is also equipped with a double joint to erect each bracing arm 9a, 9b relative to the basic box 6a by means of an upright cylinder 9g arranged between the fixed frame 9e and the bracing arms 9a, 9b, and to laterally pivot said bracing arms to a V-shaped position by means of a pivot cylinder 9h arranged between the fixed frame 9e and the bracing arms 9a, 9b. The telescopic jib 6 is then lifted upwards together with the two bracing arms 9a, 9b. Next, the two bracing arms 9a, 9b are erected from the transport position to be almost parallel to the telescopic jib 6 by the erecting cylinder 9g, and the two bracing arms 9a, 9b are spread out in a V-shape by the pivot cylinder 9h. Thus, the two bracing arms 9a, 9b are arranged almost perpendicular to the basic box 6a and form an angle of about 60 degrees with respect to each other. The bracing rod 12b is tensioned by the erecting and pivoting action.The bracing cables 12a are tensioned in parallel by the tensioning mechanism 9d. If necessary, the inner box 6b can be extended and the bracing cables 12a adjusted and tensioned by the tensioning mechanism 9d. The bracing cables 12a or the bracing rods 12b can also be connected to additional counterweights. Such a bracing device 9 is also called a lateral superlift (SSL).

[0039] In a step to complete the rigging procedure, the lifting cables 8 are then attached to the mounting frame 11, which is then detached from the lower carriage 4 and temporarily stored by the vehicle crane 2 in a suitable location or on the second transport unit 3b, after which the two bracing arms 9a, 9b are removed.

[0040] The bracing device 9 is removed from the telescopic jib 6 in the reverse order. [Explanation of symbols]

[0041] 1-unit crane system 2 Vehicle crane 3a First transport unit 3b Secondary transport unit 3c Loading surface 3d rear end 4 Lower Carriage 4a Rear end 4b Driver's seat 5th wheel 6. Telescopic Jib 6a Basic box 6b Inner box 6c Extendable Jib Foot 6d telescopic jib head 6e Color 7 Superstructure 8 Lifting Cable 9 Bracing device 9a First bracing arm 9b Second bracing arm 9c Scent tip tip 9d tension adjustment mechanism 9e Fixed frame 9f legs 9g upright cylinder 9h Pivot cylinder 9i deflection roller 10 Transport Slots 10a Transportation Support 11 Mounting frame 11a Base frame 11b Intermediate frame Intermediate frame 11c First sliding frame 11d support leg 11e Frontend 11f Rear end 11g First hydraulic cylinder 11h Support element 11i Holding frame 11j Second sliding frame 11k Second hydraulic cylinder 12a Bracing Cable 12b Bracing rod 13 Volt Connection G Vertical direction GM Centerline L Vertical direction M Installation direction R1 First direction R2 Second direction U ground

Claims

1. A vehicle crane (2) comprising a mounting frame (11), at least one bracing arm (9a, 9b) of a bracing device (9) of the vehicle crane (2) can be temporarily stored on the mounting frame (11), the mounting frame (11) comprising at least one displaceable sliding frame (11c, 11j), a single bracing arm (9a, 9b) can be temporarily stored on the sliding frame (11c, 11j), The mounting frame (11) is arranged in the extension of the lower carriage (4) of the vehicle crane (2) and completely behind the lower carriage (4) and is fixed to the lower carriage (4). Vehicle crane (2).

2. The mounting frame (11) is supported on the ground (U) via a support leg (11d) at a rear end (11f) remote from the lower carriage (4), and is connected to the rear end (4a) of the lower carriage (4) at an opposite front end (11e). A vehicle crane (2) according to claim 1.

3. The mounting frame (11) comprises a base frame (11a), an intermediate frame (11b), a first sliding frame (11c) and a second sliding frame (11j), the intermediate frame (11b) being disposed on the base frame (11a), and the two sliding frames (11c, 11j) being disposed on the intermediate frame (11b) so as to be displaceable independently of each other. A vehicle crane (2) according to claim 1 or 2.

4. characterised in that, starting from a fully retracted receiving position, the first sliding frame (11c) can only be displaced in a first direction (R1) and displaced back again, and, starting from a fully retracted receiving position, the second sliding frame (11j) can only be displaced in a second direction (R2) opposite to the first direction (R1) and displaced back again. A vehicle crane (2) according to claim 3.

5. The vehicle crane (2) comprises an undercarriage (4), an upper structure (7) and a telescopic jib (6), the telescopic jib (6) comprises a basic box (6a) having an extendable inner box (6b), a bracing device (9) having a first bracing arm (9a) and a second bracing arm (9b) can be mounted on the telescopic jib (6), and for mounting purposes, the first bracing arm (9a) and the second bracing arm (9b) can be placed one by one on the mounting frame (11). A vehicle crane (2) according to any one of claims 1 to 4.

6. A method for mounting a bracing device (9) on a telescopic jib (6) of a vehicle crane (2), in particular according to any one of claims 1 to 5, comprising the steps of: providing a first transport unit (3a) in the area of ​​the vehicle crane (2) with a mounting frame (11) to be received in the first transport unit (3a); Lifting the mounting frame (11) from the first transport unit (3a) by the vehicle crane (2); aligning the mounting frame (11) on an extension line of the lower carriage (4) of the vehicle crane (2); Fixing the mounting frame (11) to the undercarriage (4) and completely behind the undercarriage (4) and removing the vehicle crane (2) from the mounting frame (11); Providing a second transport unit (3b) with the bracing device (9) in the area of ​​the vehicle crane, the bracing device (9) being received in the second transport unit (3b) and comprising a first bracing arm (9a) and a second bracing arm (9b); Lifting the first bracing arm (9a) from the second transport unit (3b) by the vehicle crane (2); lowering and placing the first bracing arm (9a) of the bracing device (9) on the first sliding frame (11c) of the mounting frame (11) by the vehicle crane (2); displacing the first sliding frame (11c) in a first direction (R1) of the mounting direction (M) from a retracted receiving position to a laterally extending lowered position; Lifting the second bracing arm (9b) from the second transport unit (3b) by the vehicle crane (2); lowering and placing the second bracing arm (9b) of the bracing device (9) on the second sliding frame (11b) of the mounting frame (11) by the vehicle crane (2); displacing the second sliding frame (11j) in a second direction (R2) of the mounting direction (M) from a retracted receiving position to a laterally extending lowered position; luffing down the telescopic jib (6) between the first bracing arm (9a) and the second bracing arm (9b); a step of displacing the first sliding frame (11c) and the second sliding frame (11j) in each case in the mounting direction (M) from the lowered position to a central fixed position, in which the fixing frames (9e) of the first bracing arm (9a) and the second bracing arm (9b) in each case abut against a basic box (6a) of the telescopic jib (6); and fixing the first bracing arm (9a) and the second bracing arm (9b) together with the fixing frame (9e) to the basic box (6a). method.

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