Paver and method for simultaneously casting several paving material layers

• US 20050220540A1
• Filed: 03/25/2005
• Published: 10/06/2005
• Est. Priority Date: 04/02/2004
• Status: Active Grant

• Current Assignee: Joseph Vã¶Gele AG (Deere & Company)
• Original Assignee: Joseph Vã¶Gele AG (Deere & Company)
• Inventors: Schwenninger, Dieter
• Granted Patent: US 7,284,929 B2
• Time in Patent Office: Days
• US Class Current: 404/101
• CPC Class Codes: E01C 19/48 for laying-down the materials and consolidating them, or finishing the surface , e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ E01C19/002, E01C23/065 take precedence; devices for guiding or controlling the machines along a predetermined path E01C19/004

Abstract

At least two paving screeds B1, B2 which are distant in operation running direction R are supported at a chassis 1 of a paver F. The paver F is designed for simultaneously casting several paving material layers L1, L2 on top of each other on a plane P. Each paving screed B1, B2 is provided with a compaction assembly. One paving screed B1 for casting a lower layer L1 is provided at a front end section of the chassis 1 and has the compaction assembly 13, 14 for generating a degree of compaction in the lower layer L1 which suffices to withstand the direct contact of the undercarriage 2. At least one further paving screed B2 for casting an upper layer L2 is arranged behind the undercarriage 2. According to the method to be carried out with the paver F the lower layer which is cast and compacted in front of the undercarriage allows to run the undercarriage 2 on the lower layer while the upper layer L2 is cast and compacted behind the undercarriage 2.

Claims

1. Paver (F) for casting at the same time at least two paving material layers (L1, L2) on top of each other, in particular of concrete and/or asphalt, on a plane (P), comprising:

a chassis carried by an undercarriage,

the chassis being provided with at least one hopper and at least one longitudinal conveyor, and at least two paving screeds supported by the chassis each paving screed being provided with a compaction assembly,

at least one of the paving screeds being arranged behind the undercarriage,

a front paving screed for casting a lower paving material layer is provided at an end section of the chassis which is situated in operation running direction in the front of the chassis, and that the front paving screed is provided with a compaction assembly for generating a degree of compaction in the lower layer which suffices to withstand the load of the undercarriage directly travelling on the lower layer.

2. Paver as in claim 1, wherein the compacting assembly comprises a high compaction assembly.

3. Paver as in claim 1, wherein the front paving screed directly is supported at the chassis in a selectively adjusted height and/or with a selectively adjusted blade angle remaining fixed during operation.

4. Paver as in claim 1, wherein the front paving screed is supported at the chassis such that it is floatingly towed or pushed, respectively.

5. Paver as in claim 1, wherein the front paving screed is placed in front of the front section of the chassis and at least partly below a filling area of the hopper.

6. Paver as in claim 2, wherein the front paving screed contains at least one high compaction bar with compaction bar drives and at least one tamper bar with tamper bar drives.

7. Paver as in claim 1, wherein the front paving screed further comprises a screed body of a base screed part of a standardised paving screed or of a standardised extendable paving screed, respectively.

8. Paver as in claim 1, further comprising a lateral distribution assembly associated with the front paving screed in front of the front paving screed formed by one of a lateral distribution auger or a lateral distribution blade.

9. Paver as in claim 3, wherein the front paving screed is pivotable about a lateral axis by at least one adjustment drive provided between the paving screed and the chassis, and the paving screed is adjustable in height and is fixed in the adjusted position together with the lateral axis or in relation to the lateral axis and in relation to the chassis.

10. Paver as in claim 1, wherein the front paving screed has a working width larger than the track width of the undercarriage and corresponding to the working width of the at least one paving screed arranged behind the undercarriage.

11. Paver as in claim 1, wherein the front paving screed is an extendable paving screed having sidewardly extendable screed parts.

12. Paver as in claim 6, wherein the compaction bar drives and/or the tamper bar drives are hydraulic devices connected via supply strands directly to a power supply of compaction bar drives and/or tamper bar drives of the paving screed which is arranged behind the undercarriage.

13. Paver as in claim 1 further comprising:

a pouring surface assembly with the shape of a saddleback roof provided above the front paving screed, the pouring surface assembly comprising a gathering snout which extends downwardly in front of the paving screed, and

a lateral distribution assembly arranged in front of the gathering snout.

14. Paver as in claim 13, wherein the pouring surface assembly comprises sheet metal parts and/or rubber plates.

15. Paver as in claim 3, wherein:

the front paving screed is hung into outriggers provided at the chassis or at a chassis lateral beam, respectively, via a lateral tube defining the lateral axis,

the height adjustment assembly is provided between the lateral tubes and the outriggers, and

the adjustment drives are arranged between the paving screed and the chassis lateral beam.

16. Paver as in claim 1 wherein, the front paving screed and its accessory components define a sub-structure group which is removable from the paver.

17. Paver as in claim 1 wherein the paver comprises the one high compaction paving screed in front of and a further, floatingly towed high compaction screed behind the undercarriage for casting a firm trackway body, with a width up to about 3.0 m, and that both paving screeds have equal working widths and are aligned in longitudinal direction of the paver with each other, the working width, being adjustable by using broadening parts.

18. Method for casting at the same time several paving material layers on top of each other, by means of a paver on a plane, the paver comprising a chassis carried by an undercarriage, at least two paving screeds supported at the chassis with a distance in-between in casting running direction, each having a compaction assembly, according to which method first a lower layer is cast and compacted and subsequently at least one upper layer is cast and compacted on the lower layer comprising the steps of:

casting a lower layer in the operation running direction in front of the undercarriage,

compacting the cast lower layer to a degree of compaction which withstands the run of the undercarriage travelling on the compacted lower layer, running the undercarriage over the compacted lower layer during casting an upper layer on the lower layer, and

casting and compacting the at least one upper layer on the lower layer behind the undercarriage.

19. Method as in claim 18 wherein a firm trackway consisting of two concrete pavement material layers is cast on the plane up to a width of about 3.0 m.