EP2199467A1 - Paving screed and method for manufacturing a road surface - Google Patents

Abstract

The screed (E) has a base screed (G) and extension screeds (A) supported at guiding assemblies with an extension guiding structure on a fixed guidance (F). Adjustment assemblies (3) are arranged between the extension guiding structure and a lower frame of the extension screed. A lateral inclination adjustment assembly (Q) is arranged between the adjustment assemblies and the frame to which a sole plate of the extension screed is fixed to or between the frame to which the sole plate of the extension screed is mounted for lateral inclination and the sole plate of the extension screed. An independent claim is also included for a method for laying a paving mat.

Description

The invention relates to a screed according to the preamble of patent claim 1 and a method according to the preamble of patent claim 15.

In the production of a continuous road surface covering the working width, the working width is varied by extending and retracting the extending screeds on the base screed. A change in each of the pad thickness influencing angle of attack of floating screed (eg DE-C-2709435 ) relative to the plane requires adjusting the height position of the trailing edge of the respective screed screed plate relative to the trailing edge of the screed screed plate. This is done by means of the adjusting means between the pullout guide structure and the frame. A varying in the transverse direction covering thickness is adjusted by different height positions of the tow points of ZUGOLME the screed on the paver, the base plank is forcibly twisted. Despite the torsion, the uniform expandability and retractability of the extendable planks must be maintained to change the working width. In addition, the displaceability affecting installation forces act on each Ausziehbohle of a arranged at the outer end of the Ausziehbohle, the Einbaugut acting side plate and / or a screed extension part. In North America, for example, pavement pavements are frequently installed with a roadway and at least one lateral sloping shoulder, with a screed screed inclined transversely to the mounting direction of travel. It is important to keep the transition between the roadway and the hanging shoulder in the transverse direction relative to the base boom with changes in the working width.

At the DE-C-2709435 known screed, the two adjusting devices are used in the Ausziehbohle both for height adjustment and for adjusting the bank angle of the Ausziehbohlen-Glättbleches. Transversal adjustments are made for special roof profiles of the road surface, wherein the adjusting devices in the form of spindles or hydraulic cylinders are also remote-controlled depending on the angle of attack of the ground pile. In order to ensure a clamping-free changing of the working width in case of torsion of the base pile and / or under the effective installation forces, are the Mehrpunktabstützungen of the two Ausziehbohlen statically certain three-point supports the Ausziehführungsstrukturen that do not jam when moving.

At the DE-U-9211854 known screed are adjusted according to the respective angle of attack of the screed relative to the planum the screed plates of the extendable screeds automatically relative to the base board on the respective required altitude, so that no longitudinal steps arise in the finished pavement. This is done by means of a control process. The screed includes a three-point support of the Ausziehführungsstruktur on inner and outer cheeks each Ausziehbohle to change despite working forces, the working width without jamming the Ausziehbohlen can.

From CH-B-488 863 known screed with at least one extension screed on the base screed is designed inter alia for the installation of road surfaces with a lateral, hanging shoulder. The extension screed is pivoted to the screed-fixed guide either to a lying in working direction, the planum approximately parallel pivot axis, or it is adjusted together with the Ausziehbohle the pivot axis of the base board. In the first case, when the working width is changed, the lateral position of the transition between the road and the hanging shoulder changes. This is a serious disadvantage. In the second case, this transition remains stationary with respect to the ground pile. However, complicated structures are required for pivotal adjustment of the guide on the base pile.

From US-A-5568992 known screed with mounted on the rear side of the base board to scaffolding fixed guides on the Ausziehführungsstrukturen extenders also serves to produce a road surface with at least one hanging lateral shoulder. With the adjustment of each Ausziehbohle both the Ausziehbohlen-screed height position and the bank are adjusted. For height adjustment, both adjusting devices are adjusted synchronously and gleichweit. To set a bank angle of the Ausziehbohlen-Glättbleches the two adjustment devices are adjusted to different heights. A rule system containing various relevant information, e.g. B. sensors, automatically regulates the simultaneous operation of the two adjustment such that when a change in the working width, the vertical position of the Ausziehbohle is changed in response to the angle of attack of the main screed so that a certain alignment between the base board and the Ausziehbohle is complied with, so z. B. the transition between the road and the hanging shoulder remains stationary with respect to the ground pile.

Out WO-A-2004/081287 a screed is known in which each Ausziehführungsstruktur is movable on two parallel guide tubes in four support points. The four-point support tends to jam when changing the working width both in torsion of the ground pile and at high reaction forces of the mounting material.

From US-A-2007/0258769 known screed with Ausziehbohlen on the front of the base board has two adjustment for each Ausziehbohle that not only make height adjustments of the Ausziehbohlen-Glättbleches, but also set a bank angle. Each extension screed is divided telescopically into two sections. The guides are adjusted to Qumeigen the Ausziehbohlen-Glättbleches relative to the base board.

Further prior art is contained in US-A-5924819 ,

Since screeds with Ausziehbohlen for transport travel should not exceed a certain transport width corresponding to the width of the base board, and the aim is to set as maximum working width approximately twice the width of the base board, is in the off EP-B-1031660 known screed each Ausziehbohle pushed out by about half the width of the base board. For this purpose, a grundbohlenfeste guide support for the Ausziehbohle of a screed half is placed over the center of the base screed in the other base screed half, so that a connected to the Ausziehbohle guide body can be brought in the fully inserted screed over the center of the base screed in the other base screed half. This not only results in a maximum working width corresponding to approximately twice the width of the base board, but also the maximum extended Ausziehbohle is stably supported. The Mehrpunktunterstützung the Ausziehführungsstrukturen is a three-point support that does not jam when moving the Ausziehbohle in torsion of the ground pile and / or high reaction forces from the paving material.

The invention has for its object to provide a structurally simple and robust screed for installing also a suspension shoulder having a road surface and an executable with this screed method, with change the working width of the transition between the hanging shoulder and the road just relative to the base boom stationary can be maintained, and especially when shaping the shoulder high installation forces affect neither the displacement of the Ausziehbohlen still the road quality.

The stated object is achieved with the features of claim 1 and the method features of claim 15.

Since in the screed the two adjusting devices are used exclusively for adjusting the height of the Ausziehbohlen-Glättbleches, and the angle of the bank of the Ausziehbohlen-Glättbleches structurally separated from the pivot joint is adjusted relative to the frame or on the frame, can be simple and functionally reliable adjustment and drive and use control systems for this. The separate bank adjustment device is also simple and stable. The control for operating the adjusting devices and / or the bank-adjusting device is simple, since these devices are operated individually. In particular, the adjustment can be actuated relatively quickly to hold the position of the transition between the road and the hanging shoulder with respect to the base screed relatively accurately fixed with a change in the working width. Since the adjustment only make height adjustments, and the bank angle adjustment determines only the bank, the respective adjustment operations can be easier to coordinate.

Since, in one embodiment, the mounting material acting on the frame installation forces on the Ausziehbohlen-Glättblech be transferred directly over the adjustment and possibly provided vertical guides in the Ausziehführungsstruktur, which installation forces in forms of a shoulder can be relatively high, which remains relative to the frame bankable Ausziehbohlen-Glättblech free from such forces, and good surface quality is created in the area of the hanging shoulder. The support and tilt adjustment of the Ausziehbohlen-Glättblechs in the frame require only simple, low-wear operating structures.

Since, according to the method, the transverse angle of the Ausziehbohlen-Glättblechs is set independently of the adjustment, need for a height adjustment the adjusting the Ausziehbohle not be operated individually, which allows for locating the transition a simple control and possibly only a common drive of the adjustment.

Suitably, the transverse adjustment device, the pivot joint either on the frame or on the intermediate frame and as a drive at least one actuator, which is spaced from the pivot joint in the direction of displacement. To set the bank angle sufficient moderate forces for the defined pivoting movement. An elected one Angle adjustment is reliably maintained during installation. The adjustment devices are always actuated equidistant and thus better withstand installation forces, and can follow a displacement of the Ausziehbohle fast enough to hold the transverse position of the transition. The adjusting devices engage the frame when the Ausziehbohlen-smoothing plate is inclined relative to the frame, or to the intermediate frame, when the frame is inclined relative to the intermediate frame.

Suitably, the Ausziehbohlen-smoothing plate is a flat plate with an upstanding on one side apron. In order to relieve the screed screed as possible of forces of the paving when installing, a front wall is expediently mounted on the frame on the front in working direction, which engages from above on the behind it arranged skirt of Ausziehbohlen-Glättbleches down and part of the paving material Forcing forces there directly into the frame. The front wall also prevents highly dammed-in building material from flowing over the skirt.

On the relative to the frame tiltable Ausziehbohlen-screed plate is preferably detachably mounted, a support frame which has parts of the pivot joint and at least one coupling for the actuator, wherein the frame, preferably, inverted U-shaped cross section with an open, closed by the screed plate bottom and further parts of the pivot joint and a support for the actuator. The extendable screed plate is namely a wearing part that can be easily replaced. The extractor screed plate is stiffened from the support frame and fitted with the support frame from below into the frame.

The pivot axis can be defined by at least one pin which can be inserted into the aligned parts of the pivot joint. The spigot stably and broadly supports the screed screed plate on the frame or frame on the intermediate frame.

Conveniently, a mounting plate for a side plate or a screed extension part for even larger working widths is attached to the outer end of the frame. From the screed extension part or side plate acting on the frame forces from the drag resistance of the paving bypass the Ausziehbohlen-screed plate.

In embodiment with mounted on the rear side or on the front side of the base screed planks, the transverse position of the pivot joint is arbitrary, the actuator should have in the sliding direction at a great distance from the pivot joint. Because the Front mounted extractor works in Einbaufahrtrichtung in front of the base board, there is the danger of a built-in jam anyway this is not the case. In the case of rear-mounted extendable screeds, the actuator in each case is preferably arranged in an end region facing towards the center of the base screed and the swivel joint is arranged in the end region of the frame facing away from the center of the base screed. The Ausziehbohlen-smoothing plate is then pivoted at the end pointing to the base beam around the swivel axis placed as far as possible outside. Thus, no triangular dead space in front of the Ausziehbohle, in which could accumulate built-in.

The actuator of the bank actuator is at least one approximately vertically oriented hydraulic cylinder or a hydraulically or electrically driven spindle drive, e.g. with self-locking or hydraulic locking the set bank angle holds. In order to be able to make a sensitive adjustment with moderate driving force, the actuator, preferably, be combined with a bevel gear or worm gear, which converts a rotational movement of the actuator in the actuating movement. It is expedient for stability reasons even provided two actuators spaced in the working direction.

Since at least the built-in forces introduced by the exterior of the frame from the outer end of the frame can be considerable, especially with mounted screed extension parts, it is expedient to associate the adjustment vertical guides. Universal joints may be provided between the vertical guides and the frame. If the frame for setting the bank of the screed screed plate is not inclined, the vertical guides can also be rigidly connected to the frame. However, universal joints may be convenient if the frame is tilted transversely, or if it is tilted to adjust the angle of attack of the pull-out screed individually.

In an expedient embodiment, with the scaffolding screed sheet anchoring relative to the frame, the underside of the frame and the top of the skirt of the screed screed plate rise obliquely in the direction of the center of the base screed, wherein, preferably, the slope of the underside of the frame has a maximum scouring angle of approximately Limit 10%. If the screed screed plate is inclined with the maximum bank angle, it comes to stop to be stably supported.

Since even when installing a hanging shoulder by different height settings of the tow points of the Zugholme the screed the base board is twisted, and high installation forces act, it is expedient to form the multipoint support as in torsion of the base screed operating three-point support. The Ausziehführungsstruktur has on an outer cheek outside the base screed on a telescopic telescope of the fixed in the base pile guide telescoping telescope tube a first support point. On an inner cheek, the pullout guide structure within the ground pile on the telescope has a slidable second support point. Furthermore, a guide rail extending in sliding direction is attached to the Ausziehführungsstruktur at the rear, which is supported in a fixed to the base pile torque arm in both directions about the axis of the guide, so that the guide contact between the torque arm and the guide rail defines a third support point. This three-point support operates with torsion of the base board clamping force-free, so that the working width as fast as necessary, and very uniformly changeable. However, this type of three-point support, that each Ausziehbohle is pushed out only over a stroke, not quite equal to half the width of the base board, so that the maximum working width is not quite twice the width of the base board, which also limits the width of the hanging shoulder.

In order to set a working width approximately equal to twice the width of the base board with the Ausziehbohlen and thus an optimal width of the hanging shoulder when installing a hanging shoulder, in a further advantageous embodiment, the Mehrpunktabstützung also at a torsion of the base board clamping force operating three-point support Ausziehführungsstruktur. In this case, the Ausziehführungsstruktur on an outer cheek outside the base screed on one of a telescope telescope fixed to the base pile guide telescopic telescopic tube has the first support point. On a further, in the base pile parallel to the guide fixed guide tube has an inner cheek of the Ausziehführungsstruktur in a guide body a sliding second support point. Further defines a fixed to the rear of the Ausziehführungsstruktur, extending in Ausschieberichtung guide rail in a rear of the base board mounted torque arm a third support point. The guide tube is fixed at the inner end in the base pile in one of the side of the Ausziehbohle about the center of the base pile away to the other side fixation such that the second support point defining the guide body with maximally inserted Ausziehbohle on the guide tube over the middle is positioned approximately at the fixation. This results in a Ausfahrhub the Ausziehbohle corresponding to half the width of the base board, so that with the two Ausziehbohlen a working width is adjustable, which is approximately twice the width of the base board. Even with torsion of the base board and under the forces acting from the exterior of forces thus a rapid change in the working width is possible to hold the transition into the shoulder, for example, in conjunction with the adjustment. Due to the placement of the guide tube defining fixation in the other side of the base board, it is expedient to offset at least the guide tubes transversely relative to the direction of displacement, so that the fixings do not interfere with each other.

Another embodiment of the screed, which allows a largely automatic or at least semi-automatic and / or by the paver operator or installation personnel or remote operation remote control operations, has a bank angle for the bank of the Ausziehbohlen-Glättblechs and / or a height measuring device for the relative height between the Ausziehbohlen Smoothing plate and the base screed plate and / or a distance sensor in or at the actuator of the Quemeigungs-adjusting device, which are connected or signal transmitting with a higher-level control device. Based on information about the actual conditions, the extension screed can be quickly set so that regardless of changes in working width when installing a road surface with a hanging shoulder, the transition between the road and the hanging shoulder held stationary relative to the base board or at least relatively quickly to the desired position is reset.

In the embodiment of the screed, in which the frame is inclined transversely relative to the intermediate frame together with the Ausziehbohlen-smoothing plate, it is expedient to arrange the adjusting means on the intermediate frame in the direction of displacement of the Ausziehbohle between the pivot joint and the actuator of the bank adjustment. This results in an optimally large support length of the frame on the intermediate frame. Since a mounted screed extension part is also inclined transversely, a wider shoulder can be installed.

In order to keep the transition between the roadway and the hanging shoulder stationary with respect to the ground pile, when the working width is changed, remotely actuable adjusting devices are obligatory, so that the height adjustment during the displacement of the Ausziehbohle can be done. Each adjustment device can have at least one screw spindle device or hydraulic cylinder and a drive. Suitably, the two adjusting the Ausziehbohle even assigned a common fernsteuerbarer drive. A common drive is structurally simple and ensures the synchronous adjustment of both adjustment devices each over the same stroke. The drive can be a hydraulic or even electric drive. Suitably, a chain drive or chain drives or gear trains are provided between the drive or the common drive and the respective screw spindle device. The common drive could also only act on a screw spindle device, which is then coupled via a chain drive with the other screw spindle device for synchronous adjustment. In order to be able to evenly distribute loads occurring during rapid height adjustments, it is expedient to provide a pair of screw spindles in each screw spindle device of an adjusting device, and to drive the screw spindles of the pair synchronously. The respective vertical guide is suitably arranged between the two screw spindles of the pair, wherein the two screw spindles are in succession in the working direction.

According to the method, it is also advantageous if a required during installation change of the bank angle of the Ausziehbohlen-Glättblechs is carried out exclusively by operating the bank angle adjustment in the frame, and at the same time the adjusting devices are operated to hold the position of the transition relative to the base board screed plate stationary , In this case, it is possible to use a control or regulation routine in which the height adjustment speed of the adjustment devices is correlated as a reference variable with the displacement speed extension screed. This can mean that z. B. the displacement speed is adjusted according to the bank angle to the height adjustment speed.

Fig. 1

ist eine schematische Seitenansicht eines Straßenfertigers mit einer geschleppten, schwimmenden Einbaubohle beim Einbauen eines Fahrbahnbelags,

Fig. 2

ist eine Hinteransicht einer ersten Ausführungsform der Einbauhohle, wobei im Wesentlichen nur eine Hälfte einer Grundbohle und eine voll ausgeschobene Ausziehbohle gezeigt sind,

Fig. 3

ist eine perspektivische Schrägansicht von links hinten oben, der Einbaubohle gemäß Fig. 2,

Fig. 4

ist eine perspektivische Schrägansicht von links hinten oben, der Einbaubohle von Fig. 2 mit voll eingeschobener Ausziehbohle,

Fig. 5

ist eine Perspektivansicht eines Rahmens einer Ausziehbohle,

Fig. 6

ist eine Perspektivansicht eines Ausziehbohlen-Glättblechs,

Fig. 7

ist eine Draufsicht auf das außenliegende Ende des Rahmens mit daran montiertem Ausziehbohlen-Glättblech, und

Fig. 8

ist eine Perspektivansicht einer zweiten Ausführungsform der Einbaubohle.

Brief description of the drawings:

Fig. 1

is a schematic side view of a paver with a towed, floating screed when installing a road surface,

Fig. 2

is a rear view of a first embodiment of the installation hollow, wherein substantially only one half of a base pile and a fully extended extractor are shown,

Fig. 3

is a perspective oblique view from the left rear top, the screed according to Fig. 2 .

Fig. 4

is a perspective oblique view from the left rear top, the screed of Fig. 2 with fully inserted extractor,

Fig. 5

is a perspective view of a frame of a pull-out,

Fig. 6

is a perspective view of a Ausziehbohlen-Glättblechs,

Fig. 7

is a plan view of the outer end of the frame with attached Ausziehbohlen-Glättblech, and

Fig. 8

is a perspective view of a second embodiment of the screed.

Fig. 1 schematically shows a paver RF, which tows a screed E floating on a Planum P order from submitted V built-in pavement 43, z. B. consisting of a flat roadway 45 and a lateral hanging shoulder 44, to install in a working direction R. The screed E has a base board G with a below an angle of attack α relative to Planum P hired, underside screed roof screed 1, and one grundbohlenfeste guide F for at least one vertically displaceable to the drawing plane Ausziehbohle A with an underside Ausziehbohlen-Glättblech 2. The screed E is coupled to the base beam G at 8 Zugholmen 9 to tow points 5 of the paver RF, the tow points 5 individually or collectively in the direction of a double arrow 6 up and are adjustable to change the angle of attack α or for both Adjust the sides of the screed E differently. Shown are two substantially symmetrical Ausziehbohlen A at the rear of the base board G. In an alternative, not shown, only one Ausziehbohle A could be provided, or could each Ausziehbohle be arranged on the front side of the base board G.

Between a pull-out guide structure A1 on the screed-fixed guide F and the screed screed plate 2, in each pull-out screed A (FIG. Fig. 2 ) At least two spaced apart in the displacement direction Z adjusting devices 3 arranged approximately vertically. Furthermore, a separate bank adjustment device Q is provided between the adjustment 3 and the Ausziehbohlen-smoothing plate 2, for the hanging shoulder 44, as shown, the Ausziehbohlen-Glättblech 2 parallel to, for example, the Planum P and tilting in the working direction R pivot axis X to tilt. The adjusting devices 3 serve to set the rear bottom end point of the end edge of the screed screed plate 2 facing the base screed G 2, depending on the size of the angle of attack α, to the height position of the roadway 45. The bank adjustment device Q serves to adjust the inclination of the hanging shoulder 44 relative to the roadway 45 and a bank angle 39 'of the Ausziehbohlen-Glättblechs 2, such that the outer end of the lower end edge of the Ausziehbohlen-Glättblechs 2 a lower height position in a Level 4 corresponding to the outer edge of the hanging shoulder 44 occupies. A transition 19 'between the lane 45 and the hanging shoulder 44 is in the pavement 43 by the imaginary intersection point 19 (in a view of the screed E from the rear, for example according to Fig. 2 ) defined between the Ausziehbohlen-smoothing plate 2 and the base screed plate 1. This point of intersection 19 should be located at a pull-out screed A mounted on the rear side of the basic screed G. Fig. 1 ) are at the outermost end of the trailing edge of the base screed Glättblechs 1 and is to keep stationary when changing the working width with respect to the base board, so that the width of the road 45 does not change impermissibly, but the width of the shoulder 44th

When installing the road surface 43 of the screed E of the paver RF in Fig. 1 Built-in V, z. As bituminous paving or concrete property, presented on the subgrade P, spread by means of a transverse distribution device, not shown, and leveled and compacted by the floating on the slot V screed E. Optionally, additional tamper, vibrators and / or pressing devices in or in the Glättblechen 1, 2 pave the road surface 43 and compress. The pavement 45 built in by the ground beam G is flat in the transverse direction, or has a roof profile. If the towing points 5 are set to different height positions (layer thickness varying in the transverse direction), the base girder G is twisted in via the fixedly attached Zugholme 9, so that the attack angle α varies in the transverse direction.

The base board G can according to Fig. 2-4 have first and second baseboard parts G1, G2, which are connected in the center M of the base G in a joint 7 so that the baseboard parts G1, G2 are parallel to each other via a not shown adjustment (flat road 45) or bend relative to each other (road with roof profile). Each basic screed part G1, G2 has a box-like construction with inner and outer cheeks 15, 16 and a connection 8 for a drawbar 9.

The extension screed A is displaceable parallel to the base screed G on the screed-fixed guide F via the pull-out guide structure A1 by means of, for example, a drive 14 (hydraulic cylinder) (displacement direction Z in FIG Fig. 2 ). Between the pull-out guide structure A1 and the base board G, a multipoint support K is provided. In Fig. 2 this is a three-point support which can be displaced even when the base board G is twisted or under installation forces from the slot V. The guide F comprises in the embodiment of Fig. 2 to 4 three parallel guide devices F1, F2, F3, which are offset from one another in a side view of the screed E and transmit a resulting during installation, for example, from the drag resistance of the built-in V on the Ausziehbohle A resulting torque in the base board G.

The first guide device F1 ( Fig. 2 . Fig. 3 ) includes z. B. a between the cheeks 15, 16 of the Grundbohlenteils G1 fixed telescope telescope with an outer tube 26, an extendable intermediate tube 27 and an innermost telescopic tube 28. The telescopic tube 28 is fixed to an outer cheek 29 of the housing-like Ausziehführungsstruktur A1 (first support point P1).

The second guide device F2 comprises a guide rod or a guide tube 12 'fixed parallel to the telescope tube in the base half G1 between the cheeks 15, 16. That in the Fig. 2 and 3 right end of the guide tube 12 'is held in a fixation 13, which is connected to the cheek 15, but from the cheek 15 and from one side of the base board G, ie, from the base board part G1, over the middle M of time in the other Grundbohlenteil G2 extends. On the guide tube 12 ', a guide body 17 is slidably mounted on an inner cheek 18 of the Ausziehführungsstruktur A1 and defines a second displaceable support point P2. The extension screed A (whose width seen in the sliding direction approximately corresponds to the width of the base screed part G1) should be able to be displaced over a stroke which corresponds approximately to the width of the screed part G1. This is possible because the guide body 17 (second support point P2) is brought with fully inserted Ausziehbohle A across the middle M away to a position 17R in the fixation 13, in which case the inner cheek 18 of Ausziehführungsstruktur A 1, the in Fig. 2 dashed position 18R occupies. From this position 17R, the guide body 17 extends over at least the width of the base board part G1 until approximately in contact with the outer cheek 16 (FIG. Fig. 2 ) of the base screed part G1. This results even in fully ejected position ( Fig. 2 ) a stable support of the Ausziehbohle A in the base screed part G1, in the fully inserted position a minimum Working or transport width corresponding to the base board width, and two Ausziehbohlen A a maximum working width approximately equal to twice the base width, and, because of the three-point support (P1, P2, P3) a clamping force-free displacement.

The third guide device F3 comprises in the Fig. 2 and 3 a mounted on the rear side of Ausziehführungsstruktur A1, extending in the direction Z guide rail 10 and mounted on the outer cheek 16 of the Grundbohlenteils G1 torque arm 11 for the guide rail 10, which engages there, for example between rollers or sliding blocks. The guide contact between the torque arm 11 and the guide rail 10 defines a third support point P3.

In two Ausziehbohlen arranged here at the rear of the base screed Ausziehführungsstrukturen A1 and the guides F1, F2, F3 are the same, but the latter in a side view of the screed offset according to each other so that when inserting the Ausziehbohlen A no mutual obstructions.

The important advantage of the three-point support of the Ausziehführungsstruktur A1 is that in torsion of the base G and G also exerted on the Ausziehbohle A from the V insert torques no jamming forces arise, so that the adjustment 14, the cylinder tube 12 from the base plate part G1 on the center M to into the other base section G2 is sufficient, the working width can change quickly and without sudden movement or blocking.

In Fig. 2 is also another three-point support indicated. In this case, the guide body 17 'shown in dashed lines is guided on the inner cheek 18 of the Ausziehführungsstruktur A1 inside the Grundbohlenteils G1 between the cheeks 15, 16 directly on the telescope tube or its telescope base 26, so that the second displaceable support point P2 is coaxial with the first support point P1. The third support point P3 of the pull-out guide structure A1 is in turn defined in the torque arm 11 on the cheek 16 of the base board part G1 by the guiding contact with the guide rail 10. However, the displacement stroke of the guide body 17 'and thus the Ausziehbohle A is limited in this case by the distance between the cheeks 15, 16 of the Grundbohlenteils G1, and thus shorter than half the plank width.

In any case, the guide body 17, 17 'is connected to the inner cheek 18 so that it engages through a cutout in the outer cheek 16 of the Grundbohlenteils G1, and the Ausziehführungsstruktur A1 can be retracted by this cutout in the Grundbohlenteil G1 until the outer cheek 29 abuts the outside of the outer cheek 16.

The two per Ausziehbohle A provided adjusting 3 include z. B. two spaced in the displacement direction Z Schraubspindelvorrichtungen 30, 31 ( Fig. 2 ), each of which also has a z. B. may have an accessible at the top of an upper Wirkendpunkts 40 mechanical actuator 26, but not must. The upper effect end point 40 is z. B. a mounted on the underside of Ausziehführungsstruktur A1 support bracket. A lower action end point of each adjustment device 3 is defined by a bracket 35 mounted on a substantially horizontally disposed top 24 of a lower frame A2. The frame A2 is connected to the pull-out guide structure A1 via the screw-spindle devices 30, 31, and additionally via in Fig. 2 and 3 indicated vertical guides 33 supported vertically movable. Here, each screw spindle device 30, 31 comprises two screw spindles 32, between which the respective vertical guide 33 is arranged, which is connected to the Ausziehführungsstruktur A1 above and the frame A2 below each either fixed or universal joints and telescopically adjustable. Instead of the screw-spindle devices 30, 31, hydraulic cylinders (not shown) could also be used.

In the Fig. 2 and 3 For example, the screw spindles 32 of each screw spindle device 30, 31 are provided with sprockets which are coupled via an endless chain 34 for synchronous movement. It is, preferably, for both Schraubspindelvorrichtungen 30, 31, a common drive 20 arranged on the Ausziehführungsstruktur A1, for example, an electric motor or a hydraulic motor, the two screw spindles 30, 31 adjusted via endless chains 36 (gear train) synchronously and in each case via equal strokes. Alternatively, a separate drive 20 could be provided for each screw 32 or for each screw spindle device 30, 31, z. As a hydraulic motor or an electric geared motor.

The bank adjustment device Q is arranged in the frame A2 and comprises a remotely operable actuator 22 (for example, a hydraulic motor, hydraulic cylinder or an electric motor), the, z. B. (in Fig. 2 schematically indicated) is connected to at least one abutment 47 on the Ausziehbohlen-smoothing plate 2. The actuator 22 drives, for example via an angle gear or worm gear 37 at least one vertical screw 23. It could be provided alternatively a plurality of spaced apart in the direction of travel R actuators 22 or screw 23. The actuator 22 could also be a hydraulic cylinder, which is coupled via a link device or in a vertical arrangement directly to the one or more abutment 47.

By means of the actuator 22, the Ausziehbohlen-smoothing plate 2 can be pivoted about a pivot axis X of a pivot joint 21 in the frame A2 to adjust the bank angle 39 '. The pivot axis X is in the illustrated embodiment, in which the Ausziehbohle A is mounted on the rear side of the base board G, for example at the outer end portion (end plate 46 in Fig. 4 ) of the frame A2 while the actuator 22 is mounted near the opposite end portion of the frame A2. The pivot axis X is substantially parallel to the Ausziehbohlen trowel plate 2 and parallel to the working direction R. The pivot joint 21 could alternatively be placed at a different location between the ends of the frame A2.

At the outer end of the frame A2, an inserted panel V of laterally delimiting side shield 48 may be mounted on an end plate 46, or a screed extension member 49, e.g. with even greater working width to install. The drag resistance of the paving V exerts on the frame A2 forces, especially on the side plate 48 and / or the screed extension part 49. These forces are bypassing the Ausziehbohlen-Glättblechs 2 on a power transmission path in frame A2 via the vertical guides 33 and the adjusting 3 in the pullout guide structure A1 initiated.

The frame A2 of the Ausziehbohle A in the Fig. 5 . 6 . 7 vice versa has U-shaped cross section with open bottom 57 and carries on the top 24, the brackets 35. There are also an opening 54 and a bearing 54 for the actuator 22, 23 placed. Behind the end plate 46 bearing lugs 56 are arranged as part of the pivot joint 21 in the frame A2, in which, for. B. by an opening 55, at least one pivot axis X defining pin (not shown) can be mounted.

The plate-like Ausziehbohlen-smoothness plate 2 has a vorneliegende, bent-up skirt 38 'and carries a (welded and / or screwed) trough-shaped support frame 59, are mounted on the bearing eyes 58 as another part of the pivot joint 21, as well as the abutment 47 for the actuator 22nd The skirt 38 'has an upper edge 52 which initially runs parallel to the screed plate 2 and then rises at an angle. On the frame A2, a front wall 51 is mounted on arms 50, which engages with an oblique bottom edge 53 in front of the skirt 38 '(in working direction R) down, and absorbs forces from the V-fitting.

In an alternative of the screed (front mount version), not shown, each Ausziehbohle A could at the front of the base board G by means of a scaffold-fixed guide F and a Ausziehführungsstruktur A1 analogous to Fig. 2 to 4 be mounted. Here, at the pivot axis X and the pivot joint 21 could be placed at the inner end portion of the sub-frame A2 or between the end portions. The actuator 22 is then positioned near the outer end region, for example.

In Fig. 4 takes the height of the frame A2 z. B. according to the maximum skew angle 39, 39 'of the Ausziehbohlen-Glättblechs 2 gradually from whose rear lower end edge in Fig. 3 at maximum bank angle with 2E, with straight alignment with the base screed plate 1 or whose rear lower end edge 1 E with 2E '(for a flat road surface 45) is indicated.

Fig. 2 shows the transition 19 'between the lane 45 and the hanging shoulder 44. The transverse position of the transition 19' is defined by the imaginary intersection 19 between the rear lower end edge 2E of the transverse Abziehbohlen-Glättblechs 2 and the rear lower end edge 1 E of the screed Smoothing plate 1 defined. The intersection point 19 or transition 19 'is to be kept stationary with changes in the working width of the screed E with respect to the base board G, so that the width of the roadway 45 does not vary undesirably. This is effected with an actuation of the adjusting devices 3 without actuation of the bank angle adjustment device Q.

It can be used in the screed E or the extendable screed A ( Fig. 2 ) a bank angle meter 42 (for example an angle sensor, eg in subframe A2) and / or an altimeter (not shown) for detecting the relative height between the rear lower end edge 2E of the screed screed plate 2 and the rear lower end edge 1E of FIG Base plank Glättblechs 1, and / or an odometer to be provided in or in the actuator 22, which is signal-transmitting connected to a higher-level control device C, and this information provides, for example, to the bank. An angle sensor 48 for transmitting information about the angle of attack α of the screed E could also be connected to the control device C, and an odometer, z. B. The adjusting drive 14, for the sliding movement or sliding position of the Ausziehbohle A relative to the base board G. The control device C can in turn be commandingly connected to the adjustment 3 and possibly also the bank adjustment Q to in an automatic or semi-automatic sequence at Changes to the installation conditions (eg in the case of a variation of the working width), the adjustment devices 3 are actuated so synchronously that the point of intersection 19 remains stationary with respect to the base board G.

In the embodiment of the screed E in the Fig. 2 to 4 with Ausziehbohlen A mounted on the rear side of the base beam G of the intersection 19 should always remain at the outer lower end of the trailing edge of the base screed Glättblechs 2. However, when arranged on the front side of the base boom G Ausziehbohlen A 19 of the intersection could also be positioned more inwardly towards the outermost end of the rear lower edge of the screed plate 1 and then held there by changes in the working width by corresponding operation of the adjustment 3 stationary ,

Is in Fig. 1 reduces the angle of attack α, then the Ausziehbohle A and thus the inner end point of the lower edge of the Ausziehbohlen-Glättblechs 2 is raised by the forwardly rotating Grundbohle G relative to the rear lower end edge of the screed Glättblechs 1 so that in the pavement 43 a longitudinal step would create. Therefore, when the angle of attack α is reduced via the adjusting devices 3, the frame A 2 is lowered until the rear lower end edge of the extending screed screed plate 2 comes to the height position of the end edge of the screed screed plate 1. Conversely, when the angle of attack α is increased, the frame A is correspondingly raised by the adjusting devices 3. If the extractor A in Fig. 2 moved further to the right as shown, at a bank angle 39 '> 0 ° at the same time the frame A2 raised by means of the adjustment 3 so far that the intersection point 19 remains stationary. In the fully inserted position of the extractor A in Fig. 4 is the frame A2 raised so far by means of the adjustment 3, that in cross-inclined Ausziehbohlen-smoothing plate 2 of the intersection point 19 is located at the left end of the base screed Glättblechs 1.

When installing a road surface 43 with a hanging shoulder 44, a change of the working width of a displacement of the intersection point 19 relative to the base board G must be counteracted as quickly as possible. In the associated paver RF (or an outside steering position not shown on the screed E), for example, for actuating the control device C, an actuating device with switches or push buttons for controlling each Ausziehbohle A is provided. These buttons or switches can be operated individually by the operator or by the operator. The switch or button for driving the actuator 22 could be selectively locked. Upon release of its function, the control of the adjustment 3 with the button to move linked, such that upon actuation of the button or switch for moving the extension screed A, the required height adjustment is performed automatically. For a given speed of the adjusting devices 3, the speed of the pushing-out movement of the extending screed A should then be appropriately correlated with the speed of the height adjustment so that the point of intersection 19 remains stationary. In other words, the respective transverse position of the intersection point 19 can be defined for control operations in the control device C. For this rule operations are also other, not explained procedures, z. B. also a fully automatic.

In Fig. 4 the Ausziehbohle A is in fully inserted position. The outer cheek 29 of the Ausziehbohle A is externally approximately at the outer cheek 16 of the Grundbohlenteils G1. The in Fig. 4 Not shown guide body 17 is retracted into the fixation 13 (position 18R, 17R). The torque arm 11 engages the other end of the guide rail 10. The base screed screed 1 is in working direction R before the Ausziehbohlen-screed plate 2, which is raised at the inner end. The frame A2 is moved by means of the adjusting 3 so far up that in Fig. 4 left end of the rear lower edge 2E of the Ausziehbohlen-Glättblechs 2 is at the height of the rear end edge 1 E of the screed Glättblechs 1, or even higher. The telescope is fully inserted. This could also be a position for the transport journey of the road finisher RF with raised screed E, which then has a transport width only corresponding to the width of the base board G.

In the Fig. 8 shown, further embodiment of the screed E according to the invention differs from the embodiment of the Fig. 2 to 7 Mainly in that, for adjusting the bank angle 39 'of the Ausziehbohlen-Glättbleches 2 for forming a shoulder 44 is not the Ausziehbohlen-Glättblech 2 relative to the frame A2 in the pivot joint 21 is pivoted, but the Ausziehbohlen-Glättblech 2, preferably interchangeable, fixed to the frame A2 is mounted, and the frame A2 is pivoted together with the Ausziehbohlen-smoothing plate 2 in the pivot joint 21 by means of the actuators 22. The adjusting devices 3, 30, 31 of the extension screed A jointly act on an intermediate frame 61, on which the swivel joint 21 for the frame A2 is arranged, and on which the actuators 22 connected to the frame A2 also engage. The pivot joint 21 and the actuators 22 are disposed near the end portions, ie, the outer and inner ends of the frame A2 so as to position the adjusting devices 3, 31, 30 therebetween.

In Fig. 8 Both Extending Screeds A are pushed out to the maximum, the in Fig. 8 left extension screed for forming the shoulder 44 is set so that the Ausziehbohlen screed plate 2 from the outer end toward the center M of the base screed with the bank angle 39 'increases obliquely, and the transverse position of the transition 19, 19' between the shoulder 44 and the Lane 43 is located at the outer end of the screed Glättbleches 1.

For the adjusting devices 3, 30, 31 of each extension screed, a common drive 20 is mounted on the pull-out guide structure A1, which is drivingly connected via chain drives or gear trains 36 to the screw spindles of the adjusting devices 3, 30, 31.

The further construction of screed E in Fig. 8 corresponds to that of the other embodiment of the screed of Fig. 2 to 7 , The multipoint support K for the respective pullout guide structure A1 is a three-point support with the first, second and third support points P1, P2 and P3. The first support point P1 is located in the outer cheek of the Ausziehführungsstruktur A1 and where the telescopic tube 28 is mounted in the outer cheek 29. The second support point P2 is located in the guide member 17 which is fixed to the inner cheek 18 of Ausziehführungsstruktur A1 and slidably guided on the guide rod or the guide tube 12 '. The guide rod 12 'is fixed at the outer end in the outer cheek 16 of the Grundbohlenteils G1 and extends with its inner end over the center M of the base G out into the other Grundbohlenteil G2 to the there placed fixation 13, with the inner cheek 15th is connected to the Grundbohlenteils G1, so that the guide member 17 from the outer position on the inside of the outer cheek 16 of the Grundbohlenteils G1 is displaceable until approximately in contact with the fixation 13, and the stroke of the Ausziehbohle A in about half the width of Base board G corresponds. The third support point P3 is defined by the torque arm 11 mounted on the outer cheek of the base board G and the guide rail 10 mounted on the rear side of the pullout guide structure A1 by the engagement between the guide rail 10 and the torque arm 11. The first and second support points P1, P2 follow the sliding movement of the extension screed A, while the third support point P3 remains stationary with respect to the base screed G. The guide tube 12 'is in working direction R relative to the telescope telescope with the telescopic base tube 26 between the inner and outer cheeks 16, 15 of the base screed part G1, the Zwischenteleskoprohr 27 and the telescopic tube 28. The guide tubes 12 'in the two Baseboard parts G1, G2 are also offset in working direction R relative to each other, as well as the drives 14, 12, that is, the hydraulic cylinders that extend through corresponding cutouts in the outer cheeks 16 and attack in the Ausziehführungsstruktur A1.

At the outer end of each frame A2, the mounting plate 46 is provided on the in Fig. 8 the side plate 48 is mounted, which prevents the built-in material laterally beyond the set working width during installation. Instead of the side plate 48 can be mounted on the mounting plate 46, not shown screed extension part, which then also carries a side plate 48 analog.

The basic screed parts G1, G2 can be made of the in Fig. 8 shown, aligned positioning about the hinge 7 are bent relative to each other to form a roof profile in the lane 43. For this purpose, a device 62 of the base board G may be provided. Further, in this embodiment, a device 63 between the base board G and each terminal 8 of an in Fig. 8 Not shown Zugholms provided to vary the attack angle of the screed relative to the towbar or connection 8, without adjusting the tow points 5 on the paver RF.

The embodiment in Fig. 8 could be provided with a statically determined three-point support of the Ausziehführungsstruktur A1, as explained with reference to the preceding embodiment, in which then a in Fig. 8 not shown guide body is guided displaceably on the telescopic base tube 26 of the telescope tube instead of the guide body 17 on the inner cheek 18 of Ausziehführungsstruktur A1. In this case, the first and second support points P1, P2 would be arranged in the axis of the tube telescope. However, then the extension stroke of the Ausziehbohle A would be somewhat shorter than in the Fig. 8 shown three-point support.

The transverse position of the transition 19, 19 'is held stationary with respect to the base board G by changing the working width, that the adjusting devices 3, 30, 31 are adjusted in accordance with the sliding movement (drive 14, 12), namely during insertion of the Extending screed A by lifting the subframe 61, and when pushing out the Ausziehbohle A by lowering the subframe 61st

Claims (16)

Screed (E) for road paver (RF), with
a base board (G) and for changing the working width front or rear each with a Ausziehführungsstruktur (A1) on a fixed to the base board (G) guide (F) supported Ausziehbohlen (A) by means of drives (14, 12) in a direction of displacement (Z) are displaceable relative to the base board (G),
screed plates (1, 2) arranged on the base board (G) and the extendable boards (A) at the bottom,
on the base board (G) arranged connections (8) for Zugholme (9) for floating towing the screed (E) with an angle of attack (α) of the screed plates (1, 2) relative to a plane (P),
a multipoint support (K) provided between the pullout guide structure (A1) and the ground pile (G),
a Ausziehbohlen the screed plate (2) having frame (A2) of the Ausziehbohle (A), and
at least two in the direction of displacement (Z) of the respective Ausziehbohle (A) spaced over at least one drive (20) operable, approximately vertical adjustment means (3, 30, 31) between the Ausziehführungsstruktur (A1) and the frame (A) at least for adjusting the height of the frame (A2) relative to the pullout guide structure (A1),
characterized,
that in the Ausziehbohle (A) one of the adjusting devices (3, 30, 31) structurally separate bank-adjusting device (Q) is provided with at least one remotely controllable drive with which a pivot joint (21) with a at least approximately perpendicular to the direction of displacement (Z) and parallel to the Ausziehbohlen-screed plate (2) oriented pivot axis (X) either on Ausziehbohlen-screed plate (2) relative to the frame (A2) or on the frame (A2) relative to the adjusting devices (3, 30, 31) has a shoulder Tilt angle (39 ') is adjustable. Screed according to claim 1, characterized in that the pivot joint (21) of the bank angle adjustment (Q) either between the screed plate (2) and the frame (A2) or between a lower Wirkendpunkte all adjusting devices (3, 30, 31) connecting intermediate frame (61) and the frame (A2) is arranged, and which is provided as the drive of the bank angle adjustment (Q) at least one of the pivot joint (21) in the direction of displacement (Z) spaced actuator (22) either between the frame ( A2) and the Ausziehbohlen-Glättblech (2) or between the frame (A2) and the intermediate frame (61) is arranged. Screed according to claim 1, characterized in that the Ausziehbohlen-smoothing plate (2) is a flat plate with a vorneliegenden in working direction, upstanding on one longitudinal side skirt (38 '), and that on the frame (A2) at the working direction (R) front side, a front wall (51) is mounted, which engages from above over the behind arranged skirt (38 ') of the Ausziehbohlen-Glättblechs (2) downwards. Screed according to claim 1, characterized in that on the Ausziehbohlen-screed plate (2) a support frame (59) is arranged, which has parts of the pivot joint (21) and at least one abutment (47) for the remotely controllable drive, and that the frame ( A2), which preferably has the reverse U-shaped cross section with an open bottom (57), further parts of the pivot joint (21) and a support (54) for the drive carries. Screed according to claim 1, characterized in that the pivot axis (X) of at least one in successive parts of the pivot joint (21) inserted pin is defined. Screed according to claim 1, characterized in that at the outer end of the frame (A2) a mounting plate (46) for a side plate (48) or a screed extension part (49) is mounted. Screed according to claim 2, characterized in that in the Ausziehbohle (A) the pivot joint (21) at the inner or outer end portion of the frame (A2) or is arranged therebetween, preferably in the Ausziehbohle (A) mounted on the back of the base board (G) ), the actuator (22) in a center (M) of the base board (G) facing end portion and the pivot joint (21) in the center (M) of the base board (G) facing away from the outer end portion of the frame (A2) are arranged. Screed according to claim 2, characterized in that the actuator (22) has at least one approximately vertical to the displacement direction (Z) oriented hydraulic cylinder or a hydraulically or electrically driven spindle drive (23), preferably with a bevel gear or worm gear. Screed according to claim 2, characterized in that between the Ausziehführungsstruktur (A) and either the frame (A2) or the intermediate frame (61), preferably functionally associated with the adjusting devices (3, 30, 31), vertical guides (33) are provided. Screed according to claim 4, characterized in that the underside of the frame (A2) and an upper edge (52) of the skirt (38 ') of the Ausziehbohlen-Glättblechs (2) in the direction of the center (M) of the base board (G) rise obliquely. Screed according to claim 1, characterized in that the extraction screed (A) is supported by at least one adjusting device (3, 30, 31) on the multi-point support (K) formed on the three-point support operating without clamping force, in which the pull-out guide structure (A) is supported on an outer side wall (A). 29) has a first support point (P1) on an inside cheek (18) outside the base board (G) on a telescopic tube (28) which can be pushed out of a tube telescope of the guide (F) fixed in the ground beam (G) ) has a second support point (P2) in a guide body (17 ') guided on the telescope, and a guide rail extending in the ejection direction on the backrest and at a distance from the guide (F) on the guide structure (A1) (G) fixed torque arm (11) has a third support point (P3), wherein the inner cheek (18) at maximum retracted Ausz iehbohle (A) on the telescope tube to an inner cheek (15) of the base board (G) is movable. Screed according to claim 1, characterized in that the Ausziehbohle (A) via at least one adjusting device (3, 30, 31) is formed on the trained as a clamping force-free three-point support Mehrpunktabstützung (K), in which the Ausziehführungsstruktur (A1) on an outer Cheek (29) outside of the base board (G) on a telescopic telescope of the base pile (G) fixed guide telescopic telescopic tube (28) has a first support point (P1) on an inner cheek (18) within the base board (G) parallel to one on a pipe telescope and perpendicular to the direction of displacement (Z), in the base board (G) 17) has a second support point (P2) and is fixed to a guide rail (10) fixed in the direction of displacement (Z) on the rear side of the pull-out guide structure (A1) in a base board (G ), wherein the guide tube (12 ') at the inner end in the base board (G) in one of the side of the Ausziehbohle (A) over the center (M) of the base board (G ) fixed to the other side of the center (M) offset fixation (13) and the guide body (17) with maximally inserted Ausziehbohle (A) on the guide tube (12 ') over the middle (M) away until about the fixation (13) is movable. Screed according to claim 2, characterized in that on the Ausziehbohle (A) a bank angle (42) and / or an altimeter for the relative height between the Ausziehbohlen-smoothing plate (2) and the base screed plate (1) and / or a Wegmesser is provided in or at the actuator (22) and / or in or at the adjusting devices (3, 30, 31) and / or the drives (14, 12), the or with a control device (C) for screed functions signal transmitting is connected or are. Screed according to claim 1, characterized in that , preferably designed as screw spindles or screw pairs, adjusting devices (3, 30, 31) of the Ausziehbohle (A) have a common drive (20), preferably a hydraulic motor or an electric motor having , Preferably approximately centrally disposed between the adjusting devices (3, 30, 31) on the frame (12) or the intermediate frame (61) and connected to the adjusting means for their synchronous operation via gear and / or drive trains (36). Method for installing a roadway (43) with a varying working width having a roadway (45) and at least one transversely inclined lateral shoulder (44) on a subgrade (P) with a screed (E) comprising a base screed (G) with a base screed Screed plate (1) and for adjusting the working width front or rear side of the base board (G) at least one with a Ausziehführungsstruktur (A1) on a scaffolding fixed guide (F) transversely displaceable Extending Screed (A) with a Ausziehbohlen-screed plate (2) for forming the shoulder ( 44) outside a transition (19 ') from the roadway (45) in the shoulder (44), and in the Ausziehbohle (A) between the Ausziehführungsstruktur (A1) on an underlying frame (A2) at least two in the direction (Z) having spaced adjusting means (3, 30, 31) for the height position of the Ausziehbohlen-Glättblechs (2) relative to the base board screed plate (1), wherein the Forming the shoulder (44) on the Ausziehbohlen-screed plate (2) relative to the guide (F) a bank angle (39 ') is set, characterized by the following steps: the bank angle (39 ') of the Ausziehbohlen-Glättblechs (2) is either relative to the frame (A2) or together with the frame (A2) exclusively by means of one of the adjusting devices (3, 30, 31) structurally and functionally separated bank tilt adjustment ( Q), and a transverse position of the transition (19 ') between the roadway (45) and the shoulder (44) is at a variation of the working width of the road surface (43) with respect to the base board (G) by actuating the adjusting means (3, 30, 31) kept stationary. A method according to claim 15, characterized in that at least in a change in the bank angle (39 '), the transverse position of the transition (19') relative to the base board screed plate (1) by substantially simultaneously tracking the altitude of the Ausziehbohlen-Glättblechs (2) stationary is held.

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