Concrete conveyor vehicle
Patent Information
- Application Number
- PCT/EP2026/057504
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-24
- Filing Date
- 2026-03-17
- Publication Date
- 2026-10-01
Smart Images
Figure EP2026057504_01102026_PF_FP_ABST
Abstract
Description
[0001] 17.03.2026 / PH
[0002] concrete conveyor vehicle
[0003]
[0001] Concrete conveying vehicles are used to convey liquid concrete or similar materials, such as bulk materials or viscous substances, along a mast arm of the concrete conveying vehicle, so that the liquid concrete can be discharged at a desired location via a distal end of the mast arm. The mast arm is typically composed of a plurality of mast segments, wherein in an extended state the mast arm extends over a large distance and wherein in a retracted state the mast segments are in a compact state, so that the mast arm lies within the dimensions of the concrete conveying vehicle.
[0004]
[0002] By mounting the mast arm on a vehicle, high mobility is achieved, allowing the machine to be easily used in different locations. Before use, support legs are extended outwards to securely stabilize the concrete conveyor vehicle. This stabilization ensures that the concrete conveyor vehicle remains stable even when the mast arm is extended far to the side.
[0005]
[0003] For support, support cylinders arranged at the distal end of the support legs are extended downwards, so that the concrete conveying vehicle is supported by the support cylinders. The transition between the support cylinder and the distal end of the support leg currently occupies a lot of space and thus hinders a slim design of the support leg.
[0006]
[0004] The invention is based on the objective of providing a concrete conveying vehicle with which the aforementioned disadvantages are reduced. This objective is achieved by the features of the independent claim. Advantageous embodiments are specified in the dependent claims.
[0005] A concrete conveying vehicle according to the invention comprises a frame and an extendable mast arm, wherein the frame supports the mast arm, and wherein the concrete conveying vehicle is designed to convey liquid concrete along the mast arm so that the liquid concrete is dispensed at a distal end of the mast arm. The concrete conveying vehicle is equipped with a support leg, wherein the support leg is movable between a retracted state and an extended state. A proximal end of the support leg is connected to the frame. A support cylinder is attached to a distal end of the support leg. The support leg has an upper fitting structure that guides the support cylinder laterally.The support leg has a lower fitting structure that guides the support cylinder laterally. A support surface for absorbing vertical support forces is formed on the support cylinder. This support surface rests against a counter surface formed on an upper chord of the support leg.
[0007]
[0006] The invention proposes to design the connection between the support cylinder and the distal end of the support leg such that vertical forces are transferred from the support cylinder into the upper chord of the support leg. By transferring the vertical forces within the cross-sectional profile stretched across the support leg, a slender design of the support leg becomes possible. Compared to known solutions, space and weight can be saved.
[0008]
[0007] In a distal section, the support leg can have an upper chord, a lower chord, and two webs connecting the upper and lower chords. A hollow profile can be formed, bounded above by the upper chord, below by the lower chord, and laterally by the webs. The profile can be rectangular, with the webs extending vertically and the upper and lower chords extending horizontally. An upper section of the support cylinder can be arranged within a cavity bounded by the upper chord, the lower chord, and the webs.
[0009]
[0008] The support surface of the support cylinder, which absorbs vertical support forces, can be arranged such that it is not located above a plane spanned by the top of the upper chord. If the upper chord does not extend in a horizontal plane, the specification refers to a horizontal plane that is in contact with the highest point of the upper chord. The highest point is determined when the concrete pump is in a horizontal plane and the support leg is fully extended. If the support leg has several segments that can be moved relative to each other, for example by a telescopic mechanism, the upper chord of the distal segment of the support leg is considered.
[0010]
[0009] The upper chord can be formed by an upper chord plate that has a top and a bottom. The support surface of the support cylinder can be arranged such that it does not project upwards beyond a plane formed by the bottom of the upper chord plate. The bottom of the lower chord in this sense includes a mating surface machined into the underside of the lower chord against which the support surface of the support cylinder rests. If the bottom of the upper chord plate does not extend within a horizontal plane, the height position of the bottom is determined in the same way as described for the height position of the top.
[0011]
[0010] The upper chord can be provided with a reinforcing element that absorbs vertical forces from the support cylinder. The counter surface against which the support surface of the support cylinder rests can be formed on the underside of the reinforcing element. The reinforcing element can be attached to the underside of the upper chord, i.e., to the underside of the upper chord plate.
[0012]
[0011] The upper and lower fitting structures guide the support cylinder laterally, so that forces acting laterally can be reliably transferred from the support cylinder to the support leg. The upper fitting structure can be designed so that it does not project upwards beyond the plane defined by the top of the upper chord.
[0013]
[0012] The lower support structure can be designed such that it does not project downwards beyond a plane defined by the underside of the lower chord. If the lower chord does not extend in a horizontal plane, the specification refers to a horizontal plane that rests at the lowest point of the lower chord. The lowest point is determined when the concrete pump is in a horizontal plane and the support leg is fully extended. If the support leg has several segments that can be moved relative to each other, for example by a telescopic mechanism, the lower chord of the distal segment of the support leg is considered.
[0014]
[0013] The lower fitting structure can be connected to the lower chord. The lower fitting structure can extend from the lower chord towards the upper chord. The lower fitting structure can extend around the support cylinder. An inner surface of the lower fitting structure facing the support cylinder can bear against an outer surface of the support cylinder. In particular, the lower fitting structure can bear against the outer surface of the support cylinder over its entire circumference. The outer surface of the support cylinder can be cylindrical. The inner surface of the lower fitting structure can be designed as a corresponding cylindrical shape. This has the advantage that the support cylinder can be inserted into the lower fitting structure in any rotational position when assembling the concrete pumping vehicle.If a defined rotational position is desired as the final state, this can be set by rotating the support cylinder after the support cylinder has been inserted into the lower fitting structure.
[0015]
[0014] The upper fitting structure can rest against the outside of the support cylinder. The inside of the upper fitting structure, which rests against the support cylinder, can have a cylindrical shape. The part of the outer surface of the support cylinder that rests against the upper fitting structure can have a corresponding cylindrical shape.
[0016]
[0015] The support cylinder can be designed such that the diameter of the outer surface bearing against the upper fitting structure is no larger than the diameter of the outer surface bearing against the lower fitting structure. This makes it possible to insert the support cylinder from below through the lower fitting structure into the support leg during assembly of the concrete pumping vehicle and guide it upwards until the support cylinder is seated in both the lower and upper fitting structures. If both fitting structures are cylindrical, the support cylinder can still be rotated relative to the support leg structure in this position to set a predetermined rotational position.
[0017]
[0016] The upper fitting structure can engage in an area on the outer circumference of the support cylinder that lies below and / or above the support surface of the support cylinder. The upper fitting structure can project downwards from the upper chord and encompass the relevant section of the support cylinder. The upper fitting structure can be attached to the upper chord, in particular to the reinforcing part of the upper chord.
[0018]
[0017] The upper fitting structure can additionally or alternatively engage in a region on the outer circumference of the support cylinder that lies above the support surface of the support cylinder. In this case, it can be particularly advantageous if the diameter with which the upper fitting structure engages the support cylinder is smaller than the diameter with which the lower fitting structure engages the support cylinder. This opens up the possibility of arranging the support surface for receiving vertical support forces in a radial position of the support cylinder that lies between a circumferential surface of the upper fitting structure and a circumferential surface of the lower fitting structure. The support surface can be formed on a shoulder adjacent to the upper fitting structure.
[0019]
[0018] The support leg can be designed such that all forces occurring in the supported state of the concrete pumping vehicle are transmitted via the support surface, the upper fitting structure, and the lower fitting structure between the support cylinder and the distal end of the support leg. When the support cylinder is retracted, so that the concrete pumping vehicle is no longer supported by the support cylinder, the weight of the support cylinder acts, the direction of which is opposite to the vertical component of the support force. To prevent the support cylinder from falling downwards out of the support leg, the support cylinder can be attached to the structure of the support leg.
[0020]
[0019] The connecting elements with which the support cylinder is held to the structure of the support leg can have a section that is arranged above the support surface. The connecting elements can be designed so that they are accessible from the top of the upper chord in order to detach the support cylinder from the structure of the support leg or to connect the support cylinder to the structure of the support leg. The connecting elements can include one or more screw connections by which the support cylinder is held to the structure of the support leg.
[0021]
[0020] The connecting elements can extend through the top chord. The connecting elements can be designed such that they do not project upwards above a plane defined by the top surface of the top chord. For this purpose, the connecting elements can be arranged in a region of the top chord that is recessed relative to the contour of the top chord.
[0022]
[0021] An anti-rotation device can be formed between the support cylinder and the support leg structure. The support leg can be designed such that the support cylinder can be inserted into the upper and lower fitting structures during assembly without the anti-rotation device engaging. The anti-rotation device can be designed to engage in a subsequent assembly step. The invention also includes variants in which the anti-rotation device is formed in the upper fitting structure and / or the lower fitting structure.
[0023]
[0022] The anti-rotation device can be implemented in a retaining plate that can only engage with the support leg structure in one or more predetermined rotational positions. The retaining plate can be placed on top of the upper chord, in particular on a section of the upper chord that is recessed relative to the contour of the upper chord. The connecting elements with which the support cylinder is held to the support leg structure can extend through the retaining plate.
[0023] The support cylinder can be hydraulically actuated. The concrete pumping vehicle can include a hydraulic line extending between a hydraulic pump and the support cylinder. The support cylinder can be connected to a distal end of the hydraulic line. The hydraulic connection of the support cylinder can be located inside the support leg. A distal section of the hydraulic line can be routed inside the support leg.In one embodiment, the entire section of the hydraulic line between the hydraulic connection on the support cylinder and the proximal end of the support leg is routed inside the support leg.
[0024]
[0024] The support leg can be a pivoting leg. A pivoting leg is connected to the frame of the concrete pumping vehicle via a pivot joint and can be moved between a retracted and an extended position by a pivoting motion. The pivoting leg can also be a telescopic leg, either additionally or alternatively. A telescopic leg can be linearly adjusted in length by moving leg segments relative to each other. In the retracted position, the support leg lies within the contour of the concrete pumping vehicle, allowing the concrete pumping vehicle to be moved in road traffic. In the extended position, the support leg projects far outwards, ensuring the concrete pumping vehicle stands stably.
[0025]
[0025] The support cylinder can be attached to a first leg segment that forms the distal end of the support leg. In the retracted state, the first leg segment can be telescopically retracted into a second leg segment, which, in the extended state, is closer to the proximal end of the support leg than the first leg segment. Retraction of the first leg segment into the second leg segment is facilitated if neither the upper fitting structure nor the lower fitting structure nor the connecting elements with which the support cylinder is held to the structure of the support leg protrude from the contour of the first leg segment.
[0026]
[0026] Furthermore, the support cylinder can be designed such that it projects exclusively downwards beyond the contour of the first leg segment. For the insertion of the first leg segment into the second leg segment, it is advantageous if a recess is formed in the lower chord of the second leg segment, which is designed to receive the downwardly projecting part of the support cylinder. The recess can be adapted to the circumference of the support cylinder and thus be slimmer than if retaining structures are formed below the lower chord of the first leg segment that surround the support cylinder.
[0027]
[0027] The concrete conveying vehicle can include more than one support leg. These can include a front support leg and a rear support leg. The terms "front" and "rear" refer to the direction of travel of the concrete conveying vehicle when moving forward. The concrete conveying vehicle can include a front support leg and a rear support leg on both sides. Several or all of the support legs can include a support cylinder which is connected to the distal end of the support leg in a manner according to the invention.
[0028]
[0028] The concrete conveying vehicle can be designed as a concrete pump vehicle. The concrete pump vehicle comprises a concrete pump designed to convey liquid concrete along a conveying line extending to a distal end of the mast arm. The mast arm can be composed of a plurality of mast arm segments, wherein in an extended state the mast arm extends over a large distance and wherein in a folded state the mast arm segments are in a compact state, such that the mast arm lies within the dimensions of the concrete pump vehicle.
[0029] In an alternative embodiment, the concrete conveying vehicle is designed as a belt conveyor. The belt conveyor can include a mast arm with a first belt extending to a distal end of the mast arm. The mast arm can comprise multiple mast arm segments, each segment carrying a section of the belt conveyor. The mast arm can be telescopic, extending between a fully extended state and a retracted state within the dimensions of the belt conveyor. The belt conveyor can also include a second belt extending between a pre-filling hopper and the proximal end of the first belt conveyor.
[0029]
[0030] The invention is described below by way of example with reference to the accompanying drawings and advantageous embodiments. The drawings show:
[0030] Fig. 1 : a concrete pump vehicle with a mast arm in the folded state;
[0031] Fig. 2 : the concrete pump vehicle from Fig. 1 with the mast arm extended;
[0032] Fig. 3 : a schematic top view of an invention according to the concrete pump vehicle;
[0033] Fig. 4: the view according to Fig. 3 in a different state of the concrete pump vehicle;
[0034] Fig. 5 : a side view of the distal end of a support leg of the concrete pump vehicle from Fig. 3, 4 ;
[0035] Fig. 6: a vertical section through the support leg from Fig. 5; Fig. 7: an enlarged view of the support leg from Fig. 6;
[0036] Fig. 8: the view according to Fig. 7 in an alternative embodiment of the invention;
[0037] Fig. 9: the view according to Fig. 5 in an alternative embodiment of the invention;
[0038] Fig. 10: the support leg from Fig. 9 in a different state;
[0039] Fig. 11: a section along line BB from Fig. 10;
[0040] Fig. 12: the view according to Fig. 7 in a further embodiment of the invention;
[0041] Fig. 13: a top view of the support leg from Fig.
[0042] 12 ;
[0043] Fig. 14 : a schematic representation of a belt conveyor vehicle according to the invention;
[0044] Fig. 15 : the conveyor vehicle according to Fig. 11 in a top view.
[0045]
[0031] A concrete conveying vehicle in the form of a concrete pump truck 14, shown in Fig. 1, is equipped with a concrete pump 15 that conveys liquid concrete from a pre-filling hopper 16 through a conveying line 17. The conveying line 17 extends along a mast arm 18, which is rotatably mounted on a slewing ring 19. The mast arm 18 comprises three mast arm segments 20, 21, 22, which are articulated together. By pivoting the mast arm segments 20, 21, 22 relative to each other via the joints, the mast arm 18 can be moved between a folded state (Fig. 1) and an extended state (Fig. 2). The conveying line 17 extends beyond the distal end of the third mast arm segment 22, so that the liquid concrete can be applied in an area remote from the concrete pump 15.
[0046]
[0032] To ensure that the concrete pump vehicle remains stable even when the mast arm 18 is extended, support legs 31, 32, 33, 34 are provided, which are attached to the frame 26 of the concrete pump vehicle 14 via pivot joints 39. The support legs 31, 32, 33, 34 can be moved between a retracted state (Fig. 3) and an extended state (Fig. 4). An end of the support leg 31, 32, 33, 34 adjacent to the respective pivot joint 39 is referred to as the proximal end 28.
[0047]
[0033] The support legs 31, 32, 33, 34 each carry a support cylinder 35 at their respective distal end 29, which can be extended vertically downwards until a foot 42 attached to the support cylinder 35 touches the ground. By further extending the support cylinder 35, the concrete pump vehicle 14 can be raised so that it rests only on the feet 42 of the support cylinders 35. The rear support legs 32, 34 can be rigid support legs of a fixed length. The front support legs 31, 33 can be designed as telescopic support legs.
[0048]
[0034] Fig. 5 shows a side view of the distal end 29 of the left front support leg 31. The support leg 31 is in the extended position. The foot 42 of the support cylinder 35 is extended downwards, so that the concrete pump vehicle is supported by the foot 42.
[0049]
[0035] The support leg 31 forms a hollow profile composed of an upper chord 48, a lower chord 49, and two web plates 50. The support cylinder 35 is inserted from below into the profile of the support leg 31 through an opening formed in the lower chord 49. A locking mechanism 41 secures the support cylinder 35 to the structure of the support leg 31 so that it cannot fall out downwards.
[0050]
[0036] According to Fig. 6, the support cylinder 35 is supplied by a hydraulic line 45 which extends in the interior 40 of the support leg 31 and whose distal end is connected to the support cylinder 35.
[0051]
[0037] The support cylinder 35 is inserted so far into the profile of the support leg 31 that the upper end of the support cylinder 35 abuts a reinforcing part 56, which is attached to the upper chord 48, see Fig. 7. The reinforcing part 56 forms a counter surface 57 against which the support cylinder 35 abuts with a support surface 46. Vertical forces arising from the support cylinder 35 resting on the ground with its foot 42 are transmitted by the support cylinder 35 via the support surface 46 and the counter surface 57 into the reinforcing part 56 and from there into the upper chord 48.
[0052]
[0038] In the center of the support cylinder 35, a cylindrical projection 47 is formed, which is guided through an opening in the reinforcement part 56 and whose upper end projects beyond the top surface of the upper chord 48, i.e., the plane 51 of the upper chord. The locking mechanism 41 engages the upper end of the cylindrical projection 47 via a threaded connection and thus secures the support cylinder 35 against the upper chord 48.
[0053]
[0039] The circumferential surface of the cylinder projection 47 rests against the wall of the opening of the reinforcement part 56. The reinforcement part 56 thus forms an upper fitting structure 43, which provides lateral guidance for the support cylinder 35. A lower fitting structure 44 is attached to the upper surface of the lower chord 49, and thus within the interior space 40 of the support leg 31. The lower fitting structure 44 rests against the circumferential surface of the support cylinder 35 and thus also provides lateral guidance for the support cylinder 35. The lower fitting structure 44 does not project downwards beyond the plane 60 of the lower chord 49.
[0054]
[0040] All forces acting on the support cylinder 35 in the supported state are transferred via the support surface 57, the upper fitting structure 43 and the lower fitting structure 44 into the structure of the support leg 31. The support cylinder 35 is secured against falling out in the unsupported state by the locking mechanism 41.
[0055]
[0041] During assembly of the support leg, the upper end of the support cylinder 35 is inserted from below into the lower chord 49 and pushed upwards through the lower fitting structure 44 until the support surface 46 rests against the counter surface 57. In this position, the support cylinder 35 is secured with the locking mechanism 41. Disassembly is carried out in reverse order, so that the support cylinder 35 can be replaced with manageable effort.
[0056]
[0042] In the alternative embodiment according to Fig. 8, the opening in the reinforcement part 56 is larger than the diameter of the cylinder projection 47. The reinforcement part 56 absorbs vertical forces via the support surface 46 and the counter surface 57. Due to the clearance between the opening and the cylinder projection, the reinforcement part 56 does not provide lateral guidance. Instead, the upper fitting structure 43 is designed as a separate element that extends downwards from the reinforcement part 56 and engages the outer circumference of the support cylinder 35. In this embodiment, the upper fitting structure 43 is therefore located below the support surface 46 of the support cylinder 35.
[0043] In the embodiment according to Fig. 9, the support leg 31 is a telescopic support leg with a first leg segment 52 and a second leg segment 53. The first leg segment 52 forms the distal end 29 of the support leg 31 when the support leg 31 is in the extended state.The support cylinder 35 is attached to the first leg segment 52 and extends downwards from the first leg segment 52. In the extended position, the second leg segment 53 is closer to the proximal end of the support leg 31. Further leg segments, not shown in Fig. 9, may follow between the second leg segment 53 and the proximal end of the support leg. Fig. 10 shows the support leg 31 from Fig. 9 in the retracted position, with the second leg segment 52 completely enclosed within the first leg segment 53. The support cylinder 35 is positioned within the contour of the second leg segment 53.
[0057]
[0044] Due to the slim design of the support cylinder 35 below the lower chord 49 of the first leg segment 52, a small recess 58 in the lower chord of the second leg segment 53 is sufficient to accommodate the support cylinder 35. This is shown in Fig. 11, which shows a view from below of the support leg from Fig. 10 along section line BB.
[0058]
[0045] In the embodiment according to Fig. 12, the upper chord 48 is provided with a recess 59, which is arranged above the support cylinder 35. The locking mechanism, which pulls the support cylinder 35 upwards, is formed by a retaining plate 41, which is inserted into the recess 59. The recess 59 is dimensioned such that the upper surface of the retaining plate 41 is flush with the upper surface of the upper chord 48. According to Fig.
[0059] The retaining plate 41, as shown in section 13, also serves as an anti-rotation device for the support cylinder 35. The retaining plate 41 is fastened to the cylinder projection 47 of the support cylinder 35 by four screws 55. The screw heads are countersunk in the retaining plate 41 in such a way that they do not protrude above the top surface of the upper chord 48. The recess 59 and the retaining plate 41 are shaped such that the retaining plate 41 cannot be rotated relative to the upper chord 48 when connected. This also secures the support cylinder 35 in its rotational position.
[0060]
[0046] Figures 14 and 15 show an alternative embodiment of a concrete conveying vehicle in the form of a belt conveyor vehicle 66. The mast arm 67, mounted on a slewing ring 19, comprises a plurality of mast arm segments 71 that can be telescopically moved between a retracted and an extended position. A first belt conveyor 73 extends along the mast arm 67 from a proximal end 75 to a distal end. An end hose 69 is attached to the distal end, through which material conveyed by the first belt conveyor 73 is discharged. The material can be, for example, liquid concrete, another viscous material, or a bulk material. The belt conveyor vehicle 66 comprises a second belt conveyor 68, via which material that has been filled into the pre-filling hopper 60 is fed to the proximal end 75 of the first belt conveyor 73. The support legs of the concrete conveying vehicle are designed according to the invention.
Claims
Patent claims 1. Concrete conveying vehicle comprising a frame (26) and an extendable mast arm (18, 67), wherein the frame (26) supports the mast arm (18, 67), wherein the concrete conveying vehicle is designed to convey liquid concrete along the mast arm (18, 67) such that the liquid concrete is dispensed at a distal end (27) of the mast arm (18, 67), wherein the concrete conveying vehicle (14, 66) is equipped with a support leg (31, 32, 33, 34), wherein the support leg (31, 32, 33, 34) is movable between a retracted state and an extended state, wherein a proximal end (28) of the support leg (31, 32, 33, 34) is connected to the frame (26), wherein at a distal A support cylinder (35) is attached to the end (29) of the support leg (31, 32, 33, 34), wherein the support leg (31, 32, 33, 34) has an upper fitting structure (43) that guides the support cylinder (35) laterally, and wherein the support leg (31, 32, 33, 34) has a lower fitting structure (44),which guides the support cylinder (35) laterally, wherein a support surface (46) for receiving vertical support forces is formed on the support cylinder (35) and wherein the support surface (46) rests against a counter surface (57) which is formed on an upper chord (48) of the support leg (31, 32, 33, 34).
2. Concrete conveying vehicle according to claim 1, wherein the support surface (46) is not arranged above a plane (51) which is spanned by the upper chord (48).
3. Concrete conveying vehicle according to claim 1 or 2, wherein the counter surface (57) is arranged on a reinforcing part (56) connected to the upper chord (48).
4. Concrete conveying vehicle according to claim 3, wherein the reinforcing part (6) is arranged on the underside of the upper chord (E8).
5. Concrete conveying vehicle according to one of claims 1 to 4, wherein the upper fitting structure (43) is designed such that it does not project upwards above a plane (51) which is spanned by the upper chord (48).
6. Concrete conveying vehicle according to one of claims 1 to 5, wherein the lower fitting structure (44 ) is designed such that it does not project downwards beyond a plane ( 60) which is spanned by the lower chord (49).
7. Concrete conveying vehicle according to one of claims 1 to 6, wherein the lower fitting structure (44 ) is connected to the lower belt (49 ).
8. Concrete conveying vehicle according to one of claims 1 to 7, wherein the upper fitting structure (43) is arranged above the support surface (46).
9. Concrete conveying vehicle according to one of claims 1 to 8, wherein the diameter of the upper pass structure (43) is not larger than the diameter of the lower pass structure (44).
10. Concrete conveying vehicle according to one of claims 1 to 9, wherein the support surface (46) is arranged in a radial position which lies between a circumferential surface of the upper fitting structure (43) and a circumferential surface of the lower fitting structure (44).
11. Concrete conveying vehicle according to one of claims 1 to 10, wherein the support cylinder (35) is held on the upper chord (48) by connecting elements (55) and wherein the connecting elements (55) are The dunging elements (55) are recessed in a depression (59) of the upper chord (48).
12. Concrete conveying vehicle according to claim 11, wherein the connecting elements (55) do not project upwards beyond a plane (51) spanned by the upper chord (48).
13. Concrete conveying vehicle according to one of claims 1 to 12, wherein an anti-rotation device (41, 59) is formed between the support cylinder (35) and the structure of the support leg (31, 32, 33, 34).
14. Concrete conveying vehicle according to one of claims 1 to 13, wherein the support leg (31, 32, 33, 34) comprises a first leg segment (52) and a second leg segment (53), wherein the first leg segment (52) can be telescopically moved into the second leg segment (53), wherein the support cylinder (35) is attached to the first leg segment (52), and wherein a recess (58) for the support cylinder (53) is formed in the lower chord of the second leg segment (53).
15. Concrete conveying vehicle according to one of claims 1 to 14, wherein a hydraulic connection of the support cylinder (35) is arranged in the interior of the support leg (31, 32, 33, 34).