EP0750070B1 - A Road Finisher and a Method of Applying Surface Layers - Google Patents

Abstract

The road laying plant can build up the road surface in several layers. All the working sections are high compression boards (B1-3) for the production of a covering layer (C1-3). Each rear high compression board (B1,2) is constructed as a concrete compression board, and each board has a forwardly positioned tamping unit (T) and a high compression pressure strip (18) which is subject to the action of a vibrator (V). An adhesive medium tank (7) is attached to the chassis (1) and is connected to a sprayer (S).

Description

The invention relates to a paver according to the preamble Claim 1 and a method according to claim 15.

In a paver known from DE-A1-43 42 997 for Paving and compacting two layers of asphalt is the first Installation device a towed behind a cross distributor Scraper that installs the first paving layer at the correct height. An installation device towed behind another cross distributor is as screed with a compaction system formed, which installs and compresses the second covering layer and also the first covering layer due to the second covering layer condensed. The compression that can be achieved is unsatisfactory. With high demands on the covering, expensive re-rolling is necessary required.

A road paver known from DE-A1-23 14 812 is after Kind of a slipform paver with one of individually driven Crawler-type chassis with square frames, in which two screeds one behind the other and transversely offset are arranged. This paver is not for paving Multi-layer concrete layers are suitable because both screeds edit the same installation layer and the double arrangement of Screeds only for the purpose of adjusting the pave width serves.

Multi-layer concrete layers are increasingly being used made by black ceilings. Heavy traffic in particular loads the road construction with the following factors: high static and dynamic wheel forces, tire contact patches, Acceleration and deceleration, driving speed, traffic density, and acting climatic influences. The Road superstructure usually consists of one or more Base layers and the road surface. Its thickness will depend on the traffic load, the climatic conditions and the sensitivity to frost. The base layers have the job of removing the traffic loads from the pavement to transfer into the underground or the substructure, without deforming the formation. Base layers exist, e.g. from unbound or bound mineral mixtures. For bound base layers become bituminous or hydraulic Binder used. Unbound base layers are the Frost protection layer, the ballast base layer and the gravel base layer. The frost protection layer is the first base layer of the Superstructure and prevents capillary water from entering the superstructure. Bound base layers include hydraulically bound ones Base layers (HGT), concrete base layers or bituminous Base layers. A concrete base layer becomes sensitive to settlement Applied underground. It consists, for example, of Concrete B 15 or B 25 according to DIN 1045 with an installation thickness of approx. 15 cm and has so far been used with a conventional slipform paver or a rail-guided concrete paver manufactured. This layer must have transverse and longitudinal joints and are protected from drying out after installation become. Concrete ceilings are mainly used in heavily used areas Traffic areas such as highways, airports and Economic roads used. They are insensitive to temperature, have a long service life and are bright, easy to grip and wear-resistant. So far, the concrete ceiling has been installed in one layer or with a slipform paver in one operation two layers with different concrete mixes. Disadvantage of slipform pavers is that they only very easily compactable concrete with a w / z value> 0.4 can compress, but which is not immediately accessible. Less expensive is the use of one for bituminous road construction provided paver. With such a blanket maker rolled concrete (RCC) can be installed, i.e. a heterogeneous mass made of cement concrete, but with vibration and Re-compacting rubber wheel rollers. Because of the small machine effort are compared to the conventional Concrete paving with slipform pavers essential Cost savings possible. The best solution for paving concrete offers the so-called PCC technology, that with a paver with a high compaction screed (DE-C-31 14 049) is applicable, being earth-moist and difficult to compact concrete with a composition Grain sizes from 0 - 2 (sand), 2 - 8 (gravel) and grain sizes 8 - 22 processed from broken material and highly compressed becomes. The result is a through the compression effect of the High compression screed immediately and without permanent footprints accessible concrete with high stability and a proctor density of 96% at a depth of 15 cm. When installing it is optimal Watch out for water content. It can be a profile Road surface with no boundary and with the largest possible Achieve flatness. With such a paver A high compaction screed can also be drained or Install whispered concrete, the advantages of which are very high noise reduction (= ≥ - 5 dB (A)), good drain behavior, i.e. no spray flags, no aquaplaning, high resilience (void content = ≥ 15 vol .-%, good grip in dry and wet Surface, high deformation stability and favorable thermal Properties, e.g. little heating in summer.

PCC, drain or whisper concrete may require multi-layer Structure with or without adhesive bridge on a base course, whereby a PCC sub-concrete layer can be freshly made and must be passable with the paver. Possibly the sub-concrete layer can also be a finished concrete road construction his. With a paver with high compaction screed So far, however, only one Install and compact the top layer.

DE-U-93 13 also belongs to the technological background 161, FR-A-26 97 036, EP-A-0 536 052, DE-U-93 17 124 and US-A-4 073 592.

The invention has for its object a paver of the type mentioned at the beginning, with the qualitative high-quality, multi-layer concrete ceilings can be installed, as well a method of making this concrete floor structure specify.

The object is achieved according to the invention in the claim 1 included features solved. A practical one Process for making a high quality concrete ceiling structure emerges from claim 15.

The paver not only builds every covering layer to the right height , but immediately densifies every covering layer to a high degree Dimensions. The concrete high compaction screed is included specially matched to the mix concrete. Roughing the There is no concrete ceiling construction. The quality of the concrete roof construction is higher than when installing with a slipform paver. Furthermore, the cost of having this paver performed much less.

In the embodiment according to claim 2, the previous one provides Tamper device a pre-compression and smoothing, before the smoothing plate further compresses and smoothes. The pressure bar finally produces the required high final compression, it is particularly important that the pressure bar with downward swelling force impulses without impact is pressed onto the covering layer so that the swelling forces very deep into the base layer without grain disruption act. Because the reaction forces from the application of threshold forces supported upwards against the total mass of the screed are in the dynamic phase in which the threshold force pulses with an over the natural frequency of the entire frequency of the screed mass, extraordinary generate high compaction forces whose value is greater can be as the weight of the total mass of the screed. Further Information on the high compaction effect of such screeds can be found in DE-C-31 14 049, to which reference is hereby made becomes.

The feature of claim 3 is particularly important because with the reduced feed angle of the tamper device concrete is particularly well processed and pre-compressed.

Another important embodiment is set out in claim 4 forth. An adhesive bridge is then made with the adhesive, if there is a special connection between the covering layers to be produced, i.e. a special liability between a base layer (HGT) or an old concrete ceiling or bitumen ceiling and the first built-in covering layer. Creating the adhesive bridge with the same paver, which also incorporates the covering layers is environmentally friendly, inexpensive and effective.

In the embodiment according to claim 5, the two share or more pressure bars the high compression work of the covering layer among themselves. But it is also conceivable to have one wide pressure bar with a feed angle matched to concrete to use.

In the embodiment according to claim 6, more than two Covering layers installed with the same paver.

In the embodiment according to claim 7, a mutual Impairment of the high compression screeds at Work avoided. It also brings this type of coupling Manufacturing and assembly advantages.

Alternatively, however, is an embodiment according to claim 8 conceivable.

It is particularly useful, according to claim 9, the mix container through interchangeable concrete containers that form separately filled by the paver, transported and quickly replaced become.

To keep down the paver at work avoid, the embodiment according to claim 10 is appropriate.

The formation of the spray device as a spray ramp creates a continuous spray area over the respective installation width for the adhesive bridge.

In the embodiment according to claim 12 is avoided that the undercarriage damaged or destroyed the adhesive bridge or is contaminated by the adhesive.

According to claim 13, most of the adhesive bridge is already applied in front of the landing gear, while the recesses first be filled in behind the landing gear. It will be with this Training the problem of behind the chassis and before the first one Cross-distributors mostly solved cramped installation space.

In the embodiment according to claim 14, the installation width can be change the concrete ceiling construction.

The method solves the problem in a simple manner, this is the case when installing multi-layer concrete ceiling constructions characterized in that the respective lower layer for the The paver cannot be driven on while it is still in fresh condition, but for the effective connection with the covering layer lying thereon is favorable. There all covering layers with the same paver overlapping each other installed and individually compressed, creates a very strong bond and is inexpensive the concrete ceiling construction completed in one go. Roughing is no longer necessary.

In the method variant according to claim 16, two or more layers of concrete installed in one go, with the earth moist Consistency with good workability on the one hand and to very effective connection of the covering layers on the other hand leads.

In the embodiment variant according to claim 17 is the first Covering layer, a hydraulically bound base layer is provided, which are also installed by the same paver becomes like the following concrete layer (s).

The method variant according to claim 18 is important if the surface is an old layer of concrete or bitumen or, if necessary is a hydraulically bound base layer.

Fig. 1

eine Seitenansicht eines Deckenfertigers, und

Fig. 2 - 4

schematische Druntersichten von Ausführungsformen des Deckenfertigers der Fig. 1.

Embodiments of the subject matter of the invention are explained with the aid of the drawings. Show it:

Fig. 1

a side view of a paver, and

Figs. 2-4

1 is a schematic bottom view of embodiments of the paver of FIG. 1.

A paver F according to FIG. 1 has a chassis 1 with a Running gear 2 (crawler or wheel running gear) on and one Driver's cab 3 adjacent to a primary drive unit 4 (diesel hydraulic or diesel electric drive unit). At least two mix containers are on the front of the chassis 1 5, 6 arranged. There is also an adhesive tank 7 intended. Each mix container 5, 6 has its own Conveyor line 8, 9 (conveyor belts, screws or scraper conveyors) with one in the direction of travel of the paver (Fig. 1 to the left) connected to an area lying behind the chassis 1. The conveyor section 9 leads to a cross distributor 10 (Distributor screw), which is immediately behind the end of the Chassis 1 is arranged. The conveyor line 8, however, leads to a further cross distributor 11 (distributor screw), the which is arranged further back than the first cross distributor 10. Provided a third or even more mix container (not shown) provided on the chassis leads from this another conveyor line (not shown) to one even further back into the cross distributor 12.

On the chassis 1 there is also a spray device S for an adhesive provided, in Fig. 1 a spray ramp 13 immediately is arranged behind the chassis on the chassis 1. The 2-4 show detailed variations of the spray device S.

1 lateral arms 14, 15 are connected to the chassis 1, each with a high compaction screed B1 and haul B2. Is a third mix container (not shown) provided on chassis 1, then is over dashed indicated boom 16 another high compaction screed B3 dragged.

The high compaction screed closest to chassis 1 B1 installs the mix that is cross-distributed by the cross-distributor 10. The high compaction screed B2 builds the second Cross-distributor 11 cross-distributed mix. The possibly third high compaction screed B3 builds that from Cross distributor 12 distributed mix. The high compaction screed B1 forms a first high-density covering layer C1, on which the second high compaction screed B2 installs another, high-density installation layer C2, before the third high compaction screed B3 builds up another coating layer C3 with high density.

Each screed screed B1, B2, B3 can be a predetermined one Have installation width and if necessary by side attachable extension parts increased in the installation width or be reduced. But it is also conceivable to use any high compaction screed B1, B2, B3 as a so-called extending screed form, the installation width by at least one laterally extendable pull-out part (and, if necessary, mounted Extension parts) can be changed continuously.

At least the high compaction screeds B2, B3 each carry an existing tamper device T with at least a tamper bar 17 which has a feed angle matched to concrete α of approximately 30 °. The tamper bar 17 is by a drive, not shown, with a selectable Frequency moves up and down to the distributed equipment pre-compress and level. On the tamper device T follows at least one underside smoothing plate 20, which is expedient acted upon by a vibration drive 21 is and the covering layer smoothes and further compacted. Subsequently on the smoothing plate 20 is at least one transverse (wider) pressure bar 18 or are (as shown) preferably two transverse and immediately one behind the other Pressure strips 18 are provided, which are driven by threshold drives 19 with threshold force pulses directed downwards be applied, the reaction forces from the threshold force impulses directly on the whole Mass of the high compaction screed B1, B2, B3 upwards support. This way every screed paving screed is in B1, B2, B3 a high compression device V formed, the built-in layer C1, C2, C3 a gives such high compaction that re-rolling does not more is needed.

To a between the substrate and the first layer C1 High quality adhesion can be achieved with the spray device S applied an adhesive bridge H to the substrate become.

2, three sections 13a, 13b and 13c are the Spray ramp 13 of the spray device S in front of the chassis 2 so arranged that the ground contact areas of the chassis 2nd are spared. Immediately behind the chassis 2 are two further sections 13d of the spray ramp S are provided apply to the recessed areas.

In the embodiment according to FIG. 3 there are three spray ramp sections 13a-13c arranged behind the undercarriage 2, such that that the entire pave width of the high compaction screed B1 and B2 is covered.

In the embodiment according to FIG. 4 there are only two spray ramp sections 13a and 13b are provided facing each other in the transverse direction overlap.

In all embodiments of FIGS. 2-4, the Sections 13a-13c in the transverse direction and relative to one another adjust the width of the adhesive bridge to the installation width the high compaction screeds B1, B2 and B3.

With the paver F according to Fig. 1 (with the high compaction screeds B1 and B2) can be, for example a prepared surface, e.g. an old concrete or Bituminous pavement, first apply an adhesive bridge H before as Base layer, a PCC concrete layer is installed a PCC concrete layer is also installed as a ceiling (fresh-fresh-firm). However, drain concrete can also be used as a ceiling be installed on the PCC base layer. Is the paver F as in Fig. 1 with three high compaction screeds B1, B2 and B3, then can be used as the first base layer a hydraulically bound surface on the prepared surface Base course (HGT), e.g. Minerals with water, cement, Lime or bitumen, can be installed on the second base layer a PCC concrete layer is applied. On the Finally, PCC concrete layer is installed in drain concrete.

Other combinations of different types of layers are also possible. It is also conceivable to have more than three high-compression screeds connect to more than two or to install three layers of covering at the same time.

Claims (18)

1. A road finisher (F) for simultaneously applying at least two surface layers, comprising a chassis (1), a travelling mechanism (2), at least two premix containers (5, 6) arranged on said chassis (1), a lateral distributor (11, 12) associated with the respective premix container (5, 6) and arranged behind the chassis (1), said lateral distributor being adapted to have material supplied thereto from its premix container (5, 6) via a conveyor path extending in the chassis, and further comprising lateral outriggers (14, 15) attached to the chassis (1), a dragged road-surface applying device for applying a surface layer being arranged on said outriggers behind each lateral distributor (11, 12), characterized in that all road-surface applying devices are high-compaction road-surface applying screeds (B1, B2, B3) for recompaction-free application of a surface layer (C1, C2, C3), and that at least each rear high-compaction road-surface applying screed (B2, B3) is constructed as a high-compaction road-surface applying screed which is adapted to be used for applying and compacting concrete.
2. A road finisher according to claim 1, characterized in that each high-compaction road-surface applying screed (B1, B2, B3) includes a tamper device (T) located at the front and at least one transversely extending high-compaction compacting strip (18) separated from said tamper device (T) by a smoothing plate (20) which is adapted to be acted upon preferably by means of a vibration device (V), said compacting strip (18) being operatively connected to swelling force drives (19) which are arranged in said high-compaction road-surface applying screed in such a way that their upwardly directed reaction forces resulting from the force applied to the compacting strip (18) are directed straight against the total mass of the high-compaction road-surface applying screed which acts as an abutment.
3. A road finisher according to claims 1 and 2, characterized in that the high-compaction road-surface applying screed (B2, B3) which is constructed such that it is adapted to be used for applying and compacting concrete is provided with a tamper device (T) having a tamper-strip contact angle α that is markedly smaller than 45°, the size of said angle being prefereably approx. 30°.
4. A road finisher according to claim 1, characterized in that at least one bonding-additive tank (7) is indirectly or directly arranged on the chassis (7) and connected to a spray device (S) which is arranged on said chassis (1).
5. A road finisher according to claims 1 and 2, characterized in that each high-compaction road-surface applying screed (B1, B2, B3) is provided with two successive pressing strips (18).
6. A road finisher according to claim 1, characterized in that there are provided at least one additional concrete premix container with an additional conveyor path leading to a further lateral distributor (12) arranged behind the second high-compaction concrete road-surface applying screed (B2), and that an additional high-compaction concrete road-surface applying screed (B3) is arranged behind said lateral distributor (12).
7. A road finisher according to at least one of the claims 1 to 6, characterized in that each high-compaction road-surface applying screed (B1, B2, B3) is coupled to the chassis (1) via a separate pair of outriggers (14, 15, 16).
8. A road finisher according to at least one of the claims 1 to 6, characterized in that a respective rear high-compaction road-surface applying screed (B2, B3) is coupled by means of outriggers (15, 16) to outriggers (14, 15) of a preceding high-compaction road-surface applying screed (B2, 81).
9. A road finisher according to claim 1, characterized in that at least one of the premix containers (5, 6) is a concrete container which is replaceably arranged on the chassis (1).
10. A road finisher according to one of the claims 1 and 9, characterized in that the premix containers (5, 6) are adapted to have the respective premix supplied thereto from the front or from the side via feeding devices, preferably conveyor belts or feed pumps, travelling separately from the road finisher (F).
11. A road finisher according to claim 4, characterized in that the spray device (S) is provided with a transversely extending spraying beam (13) consisting of a plurality of sections (13a - 13d) defining a spray area that extends continuously over the whole mounting width of the high-compaction road-surface applying screeds (B1, B2, B3).
12. A road finisher according to claim 11, characterized in that all the sections (13a - 13c) of the spraying beam (13) are arranged behind the travelling mechanism (2).
13. A road finisher according to claim 11, characterized in that the sections (13a - 13c) of the spraying beam (13) are arranged in front of the travelling mechanism (2) in such a way that the areas where the travelling mechanism (2) contacts the ground are not acted upon by said spray means (13), and that, behind the travelling mechanism (2), short sections (13d) of the spraying beam are arranged, said short sections (13d) covering the areas which are not acted upon by the front sections.
14. A road finisher according to claim 1, characterized in that the high-compaction road-surface applying screeds (B1, B2, B3) are telescoping screeds having an adjustable mounting width or screeds whose mounting width can be varied by extension members.
15. A method of applying surface layers by means of a road finisher according to at least one of the claims 1 to 14, characterized in that at least two surface layers (C1, C2, C3) are applied one immediately after the other by means of the same road finisher (F) and in one operation in such a way that the first surface layer (C1) is applied to the ground travelled on by the road finisher and that the respective next road-surface layer (C2, C3) is applied to the previously applied surface layer (C1), each first surface layer (C1) being highly compacted during application to such a degree that recompaction is no longer necessary and each following surface layer being applied to the highly-compacted surface layer and then, in turn, highly compacted to such a degree that recompaction is no longer necessary.
16. A method according to claim 15, characterized in that the first and each following surface layer (C1, C2, C3) applied consists of semidry concrete.
17. A method according to claim 15, characterized in that the first surface layer (C1) is applied in the form of a hydraulically bound support layer, e.g. mineral substances and water, cement, lime and bitumen, and that each following surface layer (C2, C3) applied consists of semidry concrete.
18. A method according to at least one of the claims 15 to 17, characterized in that, prior to applying the first surface layer, a bonding bridge (H) is sprayed onto the ground by means of the same road finisher (F).

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