Patent Application
20080063475
A preferred exemplary embodiment of the invention will be explained in more detail below with reference to the drawing, in which:
The multi-course paver shown in
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
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
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.
The carrier frame 20 shown in
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
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
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.
| Number | Date | Country | Kind |
|---|---|---|---|
| 102006042846.3 | Sep 2006 | DE | national |
| 102006047332.9 | Oct 2006 | DE | national |
