US20080063475A1

US20080063475A1 - Method of forming a multi-course paver for paving multi-course road surfaces, and multi-course paver

Info

Publication number: US20080063475A1
Application number: US11/838,302
Authority: US
Inventors: Ronald Utterodt; Hermann Schade
Original assignee: Dynapac GmbH
Current assignee: Dynapac GmbH
Priority date: 2006-09-08
Filing date: 2007-08-14
Publication date: 2008-03-13
Also published as: EP1897999A2

Abstract

A method to form a multi-course paver from two independent pavers, namely a lower base paver (10) and an upper paver (11) saddled thereon using the piggyback principle. Both the base paver (10) and the upper paver (11) can be used as stand-alone pavers for producing single-layer road surfaces. Therefore, the invention does not require any costly add-on devices, which can be used only for multi-course paving, for paving the second course of the road surface.

Description

STATEMENT OF RELATED APPLICATIONS

This patent application is based on and claims convention priority on German Patent Application No. 10 2006 042 846.3 having a filing date of 8 Sep. 2006 and German Patent Application No. 10 2006 047 332.9 having a filing date of 6 Oct. 2006, both of which are incorporated herein by this reference in their entireties.

BACKGROUND OF THE INVENTION

1. Technical Field
The invention relates to a method of forming a multi-course paver for paving multi-course road surfaces, wherein a base paver for forming a road surface is provided, by way of conversion, with devices for forming a second road surface. Furthermore, the invention relates to a multi-course paver for paving a multi-course road surface, comprising a base paver and a device for producing a second course of the road surface.
2. Related Art
Road surfaces are conventionally formed from essentially three courses, namely a base course, a binder course and a wearing course. It has been found that a high-quality road surface can be obtained if the uppermost surface courses are paved in direct succession, so that the hot wearing course is applied to the still-hot binder course. The technical jargon term used in this connection is “hot-on-hot” laying.
Special multi-course pavers are known for “hot-on-hot” laying. For instance, EP 1 058 752 B1 discloses a multi-course paver which is formed from a conventional paver for forming a single-course road surface and from an add-on device. This add-on device is designed to produce the second road surface, that is to say the wearing course. The add-on device is arranged on a framework which is to be connected releasably to the paver, and this framework can be pushed laterally onto the travelling gear of the paver and fastened thereto by means of fastening points. The add-on device can be used only together with the paver which carries it for simultaneously paving two courses of the road surface. If the paver is to be used for paving a single-course road surface, the add-on device must be removed. It cannot be used for other purposes.

BRIEF SUMMARY OF THE INVENTION

Taking the foregoing as a starting point, the object on which the invention is based is to provide a method for forming a multi-course paver and also to provide a multi-course paver, with use being made of stand-alone pavers which can also be used for the production of conventional single-course road surfaces.
A method for achieving this object comprises a method of forming a multi-course paver for paving multi-course road surfaces, wherein a base paver for forming a road surface is provided, by way of conversion, with devices for forming a second road surface, characterized in that, for conversion purposes, an upper paver is arranged above the lower base paver. Accordingly, provision is made to arrange an upper paver above a lower base paver. Thus, for multi-course paving, use is made of two stand-alone pavers arranged one above the other on the piggyback principle. The base paver here serves as a carrier unit for the upper paver. If required, both the base paver and the upper paver can be used separately from one another to produce conventional single-course road surfaces.
It is possible, for the purpose of converting into a multi-course paver, to arrange the entire upper paver above the base paver. The upper paver here is situated at a distance above the ground, with the result that its travelling gear is not supported on the ground, and consequently only the travelling gear of the base paver serves as travelling gear for the entire multi-course paver. The travelling gear of the upper paver thus hangs in the air as it were, and so all the pavers together are carried by the travelling gear of the lower base paver. However, provision is preferably made to arrange the upper paver without its travelling gear on the lower base paver. For this purpose, the travelling gear is uncoupled from the upper paver before the said paver is placed on the lower base paver. This reduces the weight of the entire multi-course paver. The travelling gear of the base paver then need only carry the upper paver without its travelling gear. As an alternative, or additionally, the paving or compacting screed and/or distributing auger are removed from the upper paver before the upper paver is placed on the lower base paver.
Provision may be made to place the upper paver on the base paver so that the base paver, in particular its travelling gear, carries the upper paver. The travelling gear of the upper paver here does not serve to advance the multi-course paver, this task being performed solely by the travelling gear of the base paver.
According to a preferred development of the method, provision is made, however, to assign a carrier device for the upper paver to the base paver, preferably in a releasable manner. The carrier device can perform a number of jobs. It preferably serves to provide simple coupling between the upper paver and the lower base paver. However, as an alternative, or additionally, the carrier device also serves to suspend the paving screed and/or distributing auger removed from the upper paver.
The carrier device can be completely supported on the base paver such that this base paver carries both the carrier device and the upper paver. However, it is also conceivable for the carrier device to be supported wholly or at least in part on the ground. In that case at least part of the carrier device and the upper paver arranged thereon rest on the ground. The carrier device then assumes, at least in part, the function of the travelling gear of the upper paver, which can consequently be removed therefrom or is unloaded if, for multi-course paving, the upper paver is arranged above or on the lower base paver.
A multi-course paver for achieving the aforementioned object is a multi-course paver for paving a multi-course road surface, comprising a base paver and a device for producing a second course of the road surface, characterized in that an upper paver is arranged above the base paver to form the device for producing the second road surface. Provision is made here to arrange above the base paver an upper paver which serves to form the second road surface on the lower, first road surface produced by the base paver. Accordingly, according to the invention, two stand-alone pavers are arranged one above the other on the piggyback principle. Here, the lower base paver carries the upper paver, the travelling gear of which thus remains unused and unloaded and may, if appropriate, also be disassembled prior to placing the said upper paver on the lower base paver.
A multi-course paver is conceivable in which the upper paver is placed directly on the lower paver, for which purpose coupling means on the base paver and/or on the upper paver provide the connection between the two pavers and carry the upper paver, which hangs in the air as it were, on the base paver.
However, provision is preferably made to arrange at least one carrier device between the base paver and the upper paver. The carrier device comprises one or more means to retain the upper paver above the lower base paver. The carrier device can be supported completely on the base paver; however, it can also be supported wholly or in part on the ground by way of its own travelling gear, preferably a number of tyres, together with the travelling gear of the base paver. In this case, the carrier device need only be suspended on the lower base paver, with the result that essentially only the pushing or pulling force of the travelling gear of the base paver is transmitted to the carrier device, that is to say that the base paver only pulls or pushes the carrier device with the upper paver arranged thereon. In that case the travelling gear of the carrier device does not need to have its own drive, although, in an alternative embodiment of the invention, it would also be conceivable for the travelling gear of the carrier device to have its own drive.
The carrier device needs to have travelling gear preferably consisting of one or more wheels at one end only, while the other end of the carrier device rests on the base paver. The carrier device with the upper paver is then, as it were, saddled on the base paver. It is also conceivable for the carrier device with the upper paver to be supported, at least in part, on the paving screed for the upper paver, this paving screed being suspended on the carrier device, or on both paving screeds for the upper paver and the base paver. However, the carrier device with the upper paver assigned thereto can also be supported wholly on its own travelling gear, which is preferably also undriven in that case.
Furthermore, provision is made to design the travelling gear of the carrier device such that it is height-adjustable. This makes it possible to modify the weight loading on the base paver by the carrier device, and especially by the upper paver arranged thereon, to suit the requirements, even as the road surfaces are being paved. The height-adjustability of the travelling gear of the carrier device can also serve, during the paving operation, to modify the force of weight exerted by the at least one paving screed on the freshly paved road surface, in other words to adapt it to the requirements.
The carrier device can be provided with at least one storage container for one type of road-building material. This storage container can serve as an additional storage container for the storage container of the base paver, but also replace the storage container of the upper paver or of the base paver. As an alternative it is conceivable for the carrier device to be assigned a conveyor for filling a storage container of the upper paver. In that case the carrier device does not need to have a storage container.
In a preferred development of the multi-course paver, at least one means is assigned for transferring road-building material from the upper paver to the distributing auger for the road-building material of the surface course, in particular wearing course, to be produced by the upper paver. The means assigned to the carrier device thus bridges the increased distance between the paver and the distributing auger assigned thereto that results from the arrangement of the paver above the base paver.
The carrier device is preferably also assigned a compacting screed or paving screed of the upper paver. The carrier device hence carries those components of the upper paver which, owing to its arrangement on the base paver, can no longer be arranged on the paver and which, for the purpose of converting the two stand-alone pavers into the multi-course paver, have been removed from the upper paver for multi-course paving.
Finally, provision is made to design the carrier device as a preferably three-dimensional carrier frame. This carrier frame can engage both above and around the base paver and thus accommodate the upper paver, if appropriate together with the travelling gear and/or storage container remaining thereon, which means that only the paving screed and, if appropriate, the distributing auger have to be changed over from the upper paver to the carrier frame to achieve a piggyback arrangement of the upper paver on the base paver.

BRIEF DESCRIPTION OF THE DRAWINGS

A preferred exemplary embodiment of the invention will be explained in more detail below with reference to the drawing, in which:

FIG. 1 shows a simplified side view of the multi-course paver according to the invention.

FIG. 2 shows a side view of a base paver for forming the multi-course paver shown in FIG. 1.

FIG. 3 shows a side view of an upper paver for forming the multi-course paver shown in FIG. 1.

FIG. 4 shows a side view of a carrier device of the multi-course paver shown in FIG. 1.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

FIG. 1 shows a multi-course paver for simultaneously producing two courses of a multi-course road surface. The multi-course paver can preferably be used to produce a binder course and a wearing course situated above it simultaneously, that is to say in direct succession, thus making it possible for two courses, especially the binder course and wearing course, to be paved “hot-on-hot”.
The multi-course paver shown in FIG. 1 comprises two fully proficient standard commercial pavers which can each be used individually for producing a single-course road surface. To this end, an upper stand-alone paver 11 is arranged above a lower base paver 10. In the exemplary embodiment shown, the upper paver 11 is smaller than the lower base paver 10, because the wearing course is usually thinner and therefore the mass of material is less than for the lower course. However, if required, the upper paver 11 may be exactly the same size as the base paver 10, thus having the same paving performance
The upper paver 11 is arranged on the piggyback principle above the base paver 10, which hence serves as a carrier unit, specifically for the upper paver 11. In the exemplary embodiment shown, the travelling gear has been removed from the paver 11 for weight reduction purposes. The said paver is thus arranged without its travelling gear above the base paver 10 in the exemplary embodiment of FIG. 1. The travelling gear of the paver 11 is not required in order to form the multi-course paver, because according to the invention the upper paver 11 is arranged above the base paver 10 in a raised position in which the travelling gear is in any case situated at a distance from the ground 12, that is to say is not supported on the ground 12.
According to an exemplary embodiment which is not shown, it is possible for the upper paver 11 to be arranged together with its travelling gear above the base paver 10. In that case, too, the travelling gear of the paver 11 is located at a distance above the ground 12, with the result that the travelling gear hangs “in the air” and does not carry the upper paver 11 and is consequently inactive during the multi-course paving operation, which also means that it does not need to be driven. The piggyback arrangement according to the invention of the upper paver 11 above the base paver 10 has the advantage that the multi-course paver is driven only by the travelling gear 13 of the base paver 10, thereby avoiding any synchronization of the drives of the base paver 10 and the upper paver 11—even if the travelling gear of the said upper paver were used to support it on the ground 12.
The base paver 10 shown comprises travelling gear 13 which is designed as crawler-type travelling gear. However, the invention is not limited thereto. The base paver 10 of the multi-course paver can also have different travelling gear, for example wheel-type travelling gear.
The base paver 10 contains all the equipment it needs for paving one of the bottom courses of the road surface to be produced, that is to say a front storage container 15 as seen in the paving direction 14, at least one distributing auger 16 behind the travelling gear 13, and a paving screed 17 behind the distributing auger 16. The paving screed 17 is preferably a high-compaction screed. Accordingly, no alterations are required on the base paver 10 to convert it to the multi-course paver.
From the upper paver 11, which according to the invention is placed on the base paver 10 serving as carrier, have been removed the travelling gear, the distributing auger 18 and the paving screed 19 in the exemplary embodiment shown. However, if required, the travelling gear may remain on the paver 11.
In addition to the base paver 10 and the paver 11, the multi-course paver shown in FIG. 1 comprises a carrier device, here designed as a carrier frame 20. The three-dimensional carrier frame 20 spans the base paver 10. In the exemplary embodiment of FIG. 1, the carrier frame 20 is completely supported on the ground by front wheels 21 and rear wheels 22. The front wheels 21 are situated in front of the travelling gear 13 of the base paver 10 as seen in the paving direction 14, while the rear wheels 22 are situated alongside the rear region of the travelling gear 13. The wheels 21 and 22 are not provided with a drive and so are able to rotate freely. In addition, in the exemplary embodiment shown, the carrier frame 20 is connected to the base paver 10 via at least one coupling point 23. In the case of the carrier frame 20 shown, having front wheels 21 and rear wheels 22, this coupling point 23 may be dispensed with, if appropriate. When the coupling point 23 is present, it is also conceivable to dispense with the rear wheels 22, so that the carrier frame 20 is supported on the ground 12 by the front wheels 21 only. Furthermore, the carrier frame 20 is coupled to the base paver 10 via a push point 24. The push point 24 is formed in such a way that it only transmits horizontal forces between the carrier frame 20 and the base paver 10, but not vertical forces. As a result, the push point 24 serves only to allow the carrier frame 20, which does not have a drive of its own, together with the paver 11 arranged thereon, to be moved forward, in particular pushed on ahead, by the base paver 10 in the paving direction 14.
When the coupling point 23 is present, the push point 24 may be dispensed with, if appropriate. Provision is also made to relieve the load on the base paver 10, in particular the paving screed 17 suspended thereon, during the paving of the road surfaces by adjusting the height of at least the rear wheels 22 and/or the coupling point 23. For this purpose, a height adjustment of the rear wheels 22 and/or the coupling point 23 is brought about by means of suitable mechanically, electrically, hydraulically or pneumatically operated lifting means.
The upper paver 11 is placed on the carrier frame 20. This means that, with the aid of the carrier frame 20, the upper paver 11 is saddled on the lower base paver 10. The lower base paver 10 here serves as a carrier unit and at the same time also serves to drive the carrier frame 20 together with the paver 11 arranged thereon. The upper paver 11 is connected releasably to the carrier frame 20, specifically at suitable points. The upper paver 11 is preferably connected to approximately horizontally extending upper bearers 25 of the carrier frame 20, for example by screwing. To obtain exact positioning of the upper paver 11 on the carrier frame 20, stops or positioning means may be provided on the upper paver 11 and/or carrier frame 20.
The distributing auger 18 and the paving screed 19 for the upper paver 11 are also carried by the carrier frame 20. The distributing auger 18 of the paver 11 and, behind it, the paving screed 19 of the upper paver 11 are fastened to the carrier frame 20 behind the paving screed 17 of the base paver 10. At least the paving screed 19 is arranged height-adjustably at the rear end of the carrier frame 20. As an alternative, the paving screed 19 or else the distributing auger 18 can be adjusted in height by adjusting the height of the rear wheels 22 of the carrier frame 20 or the height of the coupling point 23 between the base paver 10 and the carrier frame 20.
FIG. 4 shows the carrier frame 20 with the front wheels 21 and the rear wheels 22 along with the paving screed 19 and the distributing auger 18 for the upper paver 11. It can be seen from this figure that the rear wheels 22 are mounted on a rear end of a rocker 26. The opposite, front end of the rocker 26 can be pivoted about a horizontal axis of rotation 27. In the exemplary embodiment shown, at least one pressure-medium cylinder 28 serves to pivot the rocker 26. The paving screed 19 is suspended on the rear end of a levelling arm 29, preferably a pair of parallel levelling arms. Mutually opposite front ends of the levelling arms 29 are pivotally mounted on the carrier frame 20. The levelling arms 29 are height-adjustable by means of at least one pressure-medium cylinder 30.
The carrier frame 20 shown in FIG. 4 is provided on its front side with a storage container 31. This can be designed in such a way that it enlarges the storage container 15 of the base paver 10. However, it is also conceivable for the storage container 31 on the carrier frame 20 to replace the storage container 15 of the base paver 10. In this case, prior to converting the base paver 10 into the multi-course paver, the storage container 15 should be disassembled from the base paver 10. Furthermore, in the case of the multi-course paver shown here, the storage container 31 is assigned a tilting hopper 32 at the front end of the carrier frame 20. Likewise a tilting hopper 33 is assigned to the storage container 34 of the upper paver 11. The storage container 31 on the carrier frame 20 serves to hold the material for the road course situated beneath the wearing course, preferably the binder course, which is paved by the base paver 10. By contrast, the storage container 34 serves to hold the wearing course material which is paved by the upper paver 11.
As an alternative, it is also possible for the front part of the carrier frame 20 to be assigned a conveying device, which serves to charge the storage container 34 of the upper paver 11 with wearing course material. A separate charger is then unnecessary. Instead, a lorry can be used to fill the storage container 34 of the upper paver 11 by means of the conveying device. Here, the lorry is, as usual, pushed forwards by the multi-course paver. For this purpose, push rollers 35 which are shown by way of indication in FIGS. 1 and 4, are provided in front of the front wheels 21 of the carrier frame 20.
Between the upper paver 11 and the associated distributing auger 18 is provided a device for transferring the wearing course material, which is transported from the scraper conveyer of the paver 11 to behind the latter, to in front of the lower distributing auger 18. In the exemplary embodiment shown, this device is a simple chute 36. The wearing course material passes under gravitational force along the chute 36 to in front of the distributing auger 18.
The method according to the invention proceeds with the multi-course paver represented in FIG. 1 as follows:
Independent pavers are used to form the base paver 10 and the upper paver 11. The carrier frame 20 is additionally required. The base paver 10 and the upper paver 11 can be used independently of one another, that is to say each individually, to pave single-layer road surfaces. This means that the multi-course paver according to the invention can be formed from two standard pavers, it being the case that, in the exemplary embodiment shown, the upper paver 11 is smaller than the lower base paver 10.
No alterations whatsoever are required on the lower base paver 10 to form the multi-course paver. Only if, as in the exemplary embodiment shown, the carrier frame 20 has a relatively large storage container 31, the storage container 15 of the base paver 10 may be disassembled beforehand.
From the upper paver 11 are to be removed the distributing auger 18, the paving screed 19 and, if appropriate, the travelling gear. The upper paver 11 is then arranged above the base paver 10 on the piggyback principle. In the case of the multi-course paver shown here, the upper paver 11 is placed on the carrier frame 20. This can take place after the carrier frame 20 has been connected to the base paver 10. However, it is also conceivable first to place the upper paver 11 on the carrier frame 20 and then, if the distributing auger 18 and the paving screed 19 have not yet been fastened to the carrier frame 20, to move the base paver 10 into the carrier frame 20 from behind, as a result of which the lower base paver 10 passes below the upper paver 11. Next, the paving screed 19 for the wearing course material is fastened to the levelling arms 29 on the carrier frame 20, and the distributing auger 18 assigned to the upper paver 11 is connected to the carrier frame 20.
The multi-course paver is converted back into two stand-alone pavers in the reverse order. Then only the carrier frame 20 remains unused.
As a departure from the above-described method, it is also conceivable for the travelling gear of the upper paver 11, which may be crawler-type travelling gear or wheel-type travelling gear, to remain thereon. In that case the upper paver 11 is arranged with its travelling gear on the carrier frame 20 above the base paver 10. However, the travelling gear of the upper paver 11 here hangs in the air because the upper paver 11 is lifted onto the carrier frame 20, its travelling gear being situated at a considerable distance from the ground 12, thus not having any contact with the ground 12. The weight of the entire multi-course paver with the upper paver 11 rests either on the travelling gear 13 of the base paver 10 or to some extent on the at least front wheels 21 and, if appropriate, also rear wheels 22 of the carrier frame 20. The entire multi-course paver is advanced exclusively and solely by the travelling gear 13 of the lower base paver 10. The entire multi-course paver is also steered only with the aid of the travelling gear 13 of the base paver 10. To ensure that the wheels 21 and 22 of the carrier frame 20 do not interfere here, it is possible for at least the front wheels 21 to be able to rotate freely about vertical axes of rotation and thus to follow curving movements of the multi-course paver, without steering being required particularly for the front wheels 21 of the carrier frame 20.
As a departure from the exemplary embodiment described above, it is possible according to the invention for the multi-course paver to be formed even without the additional carrier frame 20. In that case the multi-course paver consists essentially only of the base paver 10 and the upper paver 11, which then alone rests, without contact with the ground 12, on the base paver 10 serving as carrier. The distributing auger 18 and the paving screed 19 for the upper paver 11 are then suspended on the base paver 10 in a suitable manner, specifically behind its paving screed 17.

LIST OF REFERENCES

10 base paver
11 upper paver
12 ground
13 travelling gear
14 paving direction
15 storage container
16 distributing auger
17 paving screed
18 distributing auger
19 paving screed
20 carrier frame
21 front wheel
22 rear wheel
23 coupling point
24 push point
25 bearer
26 rocker
27 axis of rotation
28 pressure-medium cylinder
29 levelling arm
30 pressure-medium cylinder
31 storage container
32 tilting hopper
33 tilting hopper
34 storage container
35 push roller
36 chute

Claims

1. Method of forming a multi-course paver for paving multi-course road surfaces, wherein a base paver (10) for forming a road surface is provided, by way of conversion, with devices for forming a second road surface, comprising, for conversion purposes, arranging an upper paver (11) above the base paver (10).

2. Method according to claim 1, wherein the upper paver (11) is arranged above the base paver (10) such that the upper paver (11) and travelling gear of the upper paver (11) are situated at a distance above a ground surface.

3. Method according to claim 1, wherein the entire multi-course paver is driven by travelling gear (13) of the base paver (10).

4. Method according to claim 1, wherein the upper paver (11) is saddled on the base paver (10).

5. Method according to claim 1, wherein the upper paver (11) is arranged without travelling gear above the base paver (10).

6. Method according to claim 1, wherein the upper paver (11) is arranged without a paving screed (19) and/or a distributing auger (18) on the base paver (10).

7. Method according to claim 1, wherein the upper paver (11) is placed on the base paver (10) without contact with the ground.

8. Method according to claim 1, wherein the base paver (10) is assigned a carrier device for the upper paver (11), which carries the upper paver (11).

9. Method according to claim 8, wherein the carrier device for the upper paver (11) is assigned to the base paver (10) in a releasable manner.

10. Method according to claim 8, wherein at least a paving screed (19), which is removed from the upper paver (11), is suspended on the carrier device.

11. Method according to claim 1, wherein a base course or binder course is paved by the base paver (10) and a wearing course is paved by the upper paver (11).

12. Multi-course paver for paving a multi-course road surface, comprising a base paver (10) and a device for producing a second course of the road surface, wherein an upper paver (11) is arranged above the base paver (10) to form the device for producing the second course of the road surface.

13. Multi-course paver according to claim 12, wherein the upper paver (11) is placed on the base paver (10).

14. Multi-course paver according to claim 12, wherein at least one paving screed (19) of the upper paver (11), separated therefrom, is suspended on the base paver (10).

15. Multi-course paver according to claim 12, wherein a carrier device is arranged between the base paver (10) and the upper paver (11) arranged above the base paver.

16. Multi-course paver according to claim 15, wherein the carrier device is coupled to the base paver (10) such that the upper paver (11), without an active travel drive of its own, can be moved with the carrier device by the base paver (10).

17. Multi-course paver according to claim 15, wherein the carrier device is supported at least in part on a different ground surface.

18. Multi-course paver according to claim 17, wherein the carrier device is supported on the ground by at least one wheel (21, 22).

19. Multi-course paver according to claim 18, wherein at least one wheel (22) of the carrier device is height-adjustable.

20. Multi-course paver according to claim 15, wherein the carrier device is supported on the base paver (10) via at least one push point (24) for transmitting a horizontal force or movement of the base paver.

21. Multi-course paver according to claim 15, wherein the carrier device is assigned at least one storage container (31) for one type of road-building material.

22. Multi-course paver according to claim 15, wherein the carrier device is assigned a conveyor for filling a storage container (34) of the upper paver (11).

23. Multi-course paver according to claim 15, wherein the carrier device is assigned at least one means for transferring road-building material from the upper paver (11) to a rear distributing auger (18).

24. Multi-course paver according to claim 15, wherein the carrier device is assigned at least a paving screed (19) of the upper paver (11).

25. Multi-course paver according to claim 24, wherein the paving screed (19) of the upper paver (11) is suspended on the carrier device.

26. Multi-course paver according to claim 15, wherein a paving screed (19) and a distributing auger (18) of the upper paver (11) are suspended on the carrier device.

27. Multi-course paver according to claim 15, wherein the carrier device is designed as a three-dimensional carrier frame (20).

28. Method according to claim 9, wherein at least a paving screed (19), which is removed from the upper paver (11), is suspended on the carrier device.

29. Multi-course paver according to claim 13, wherein at least one paving screed (19) of the upper paver (11), separated therefrom, is suspended on the base paver (10).

30. Multi-course paver according to claim 16, characterized in that the carrier device is supported at least in part on a different ground surface.

31. Multi-course paver according to claim 30, characterized in that the carrier device is supported on the ground by at least one wheel (21, 22).

32. Multi-course paver according to claim 31, characterized in that at least one wheel (22) of the carrier device is height-adjustable.