EP1925736B1 - Method for producing a sprayed layer and paving machine with spraying system - Google Patents

Description

The invention relates to a method according to the preamble of patent claim 1 and to a road paver according to the preamble of patent claim 11.

The out EP 0 484 236 A Known paver has distributed over the length of the paver on several trained as ramps spraying, which are offset even across the longitudinal axis of the paver against each other, for example, to form three strip-shaped Sprühgassen that result behind the paver cross-linked spray carpet. A first spraying ramp is placed in front of the chassis and sprays the ground between the lanes of the landing gear. Second sprayers are located behind the landing gear in the rear paver area which spray the lanes. Third spraying devices are provided outside the lanes, longitudinally between the front and rear sprayers, to spray the areas outside the landing gear up to the full working width. The spray carpet, as the sprayers are reciprocated and the spray nozzles deactivated upon reversal of motion, is tessellated from single, rectangular or parallelogram spray fields. Since the spraying device is designed so that all sprayers are activated simultaneously from the start of spraying and deactivated at the spray end, resulting from the displacement of the spraying in the direction of travel and transverse to a spray carpet whose rear and front boundaries are not straight and transverse to the direction of travel, but have a stair profile. However, since the installation start or the installation end of the built-in ceiling layer is rectilinear transverse to the direction of travel, and it must be ensured that the sprayed carpet extends over the full working width to the installation start and the installation end, remain due to the stair profile of the rear and front boundaries of the spray mat of the ceiling layer uncovered sections of the stair profile left over. This not only means a waste of the adhesive, but also a not necessary preimpregnation of the subgrade, which is multiplied by the fact that at a new installation start and connection a new ceiling layer is applied to an already built-in, in turn adhesive in excess according to the stair profile, since the new cover layer to be installed, of course, again on the working width fresh adhesive needed to achieve a homogeneous bond. In order to eliminate this disadvantage, in practice the respective stair profile can usually be supplemented with spray lances by hand. However, this usually results in a locally too rich application of the adhesive, which then acts for the ceiling layer rather as a release layer (adhesion damage), and an undesirable environmental impact with bitumen odor and spray.

The out DE 41 01 417 A Known road paver is designed so that the spray system is also optionally degradable. Below the landing gear, the spraying system comprises spraying ramps, which not only spray the basic width of the screed but also have extension beams which can be extended or swung out laterally. The mounting and handling of the extension beams spraying the outer areas of the working width can lead to problems. In addition, it is difficult to accommodate the sprayers in this area between the rear of the paver and the transverse spreading device for the screed.

At the DE 93 17 124 U known Sprühfertiger different spraying devices are mounted offset to one another in the longitudinal direction and transverse direction of the paver. All ancillary equipment common to all sprayers such as pumps and filters are mounted in a free space of the chassis. As soon as the ancillaries are switched on, all sprayers are supplied with the adhesive at the same time and all sprayers start spraying at the same time. From the dislocations between the sprayers and the simultaneous activation or deactivation results at the beginning of the spray carpet and at the end of the spray carpet, a stair profile that does not match the rectilinear transverse to the direction extending approaches the built-in ceiling layer.

In the distribution apparatus for bituminous material according to US 2,372,065 a transverse to the direction of travel extending main beam with nozzles is provided, on which at both ends pivotable beams are articulated with nozzles to vary the spray width by pivoting the end-side bars. A straight start of spraying, which runs transversely to the direction of travel, is only achieved with fully swung-out side beams. On the other hand, at a shorter working width, no spray start (or a spray end) that is rectilinear to the direction of travel is generated. All nozzles will be simultaneously with the bitminous Material supplied because a common valve device and a common pump are provided, which are activated or deactivated for a spraying process.

The invention has for its object to provide a method of the type mentioned above and designed for performing the method road paver, which make it possible despite the dislocations between the spray without tedious manual labor, waste of adhesive or contamination of the subgrade a substantially ideal rectangular spray carpet to produce consistently straight front and rear boundaries.

The stated object is achieved with the features of claim 1 and with the paver according to claim 11.

Since, according to the method, each spraying device is only activated to move when it has reached or reaches a certain distance from the previously set reference line, the rear boundary of the sprayed carpet becomes straight and parallel to the reference line, as does the front boundary of the sprayed carpet. Thus, the front and rear boundaries close to the installation start and installation end of the ceiling layer exactly, without wasting adhesive or unnecessarily polluting the planum. Of course, in practice, some overlap is introduced, i.e., the front and rear boundaries of the sprayed carpet come to lie very slightly in front of the installation end and behind the installation end, respectively, to avoid certain areas of the ceiling layer from receiving the desired bond. Even the most improperly dosing and polluting handwork is eliminated. The paver is equipped with its control device, either the controller of the paver itself or a spray system control device preferably communicating therewith, which is designed to sequentially activate and deactivate the spray devices if the respective spraying device is at the predetermined distance from the reference line or Reference line reached. This reference line is, preferably, also taken into account when installing the ceiling layer for the installation beginning and the installation end. This means that, in practice, two reference lines are set up, namely when an installation and spraying cycle starts and at the end of a fitting and spraying cycle.

In a suitable variant of the method, a spraying device oriented at 90 ° to the direction of travel movement is activated or deactivated with a plurality of spray nozzles spaced apart in the longitudinal direction of the spraying device so that all spraying nozzles spray start or finish at the same time. In this way, this spraying device generates a part of the front or rear boundary of the sprayed carpet, which part is rectilinear and transverse to the driving direction of movement.

In another expedient variant of the method, each spraying device which can be aligned with the direction of travel at a different angle than 90 ° is activated or deactivated with at least one spray nozzle, preferably a plurality of spray nozzles spaced longitudinally of the spraying device, such that each spray nozzle is separated by the predetermined distance from or Upon reaching the reference line, a spraying process begins or ends. In this way, in spite of the 90 ° different orientation angle of this sprayer again a part of the front or rear boundary of the sprayed carpet is generated, which is straight and transverse to the direction of travel movement, regardless of the angle.

When activating or deactivating each spraying device oriented at 90 ° to the direction of travel movement, it is expedient to measure the path up to the reference line in order to be able to precisely control the time of activation or deactivation.

On the other hand, in order to activate or deactivate each spraying device which can be oriented at an angle other than 90 ° to the direction of travel movement, a measurement of the path up to the reference line for each spray nozzle or a measurement of the alignment angle of the spray device and a position determination of each spray nozzle with respect to the reference line can be made; to deactivate or activate at the right time. This can be carried out, expedient, automatically via the control device, so that the operator does not need to worry about control operations, or triggered by an operator. In this case, of course, preferably, also proceeded depending on the set over the orientation angle of the sprayer working width, because this determines the orientation angle. Appropriately, the dosage is varied so that with smaller working width and thus small orientation angle, the amount of each spray nozzle is withdrawn, as overlap at a smaller angle, the spray nozzles in the direction of travel more than at larger orientation angle.

The method is expediently carried out such that first the reference line is placed virtually but stationary on the planum. Then, in the spray control device, preferably via a screen, the respective setpoint for the driving speed, the working width, the amount of spraying per unit area, and the like are input, and the spraying operation of the spraying system is switched to standby. Only then the vehicle is set in motion. As soon as the driving movement has begun, the spraying device closest to the reference line at the predetermined distance or reaching the reference line is automatically activated. At the end of the production of the sprayed carpet, the procedure is reversed in that initially the reference line is again placed virtually, and the sprayers are again deactivated sequentially with reference to the reference line.

In this case, it is expedient if the adhesive is heated in a controlled manner before starting the vehicle and circulated in the spray devices, wherein a release signal dependent on a setting check of the setpoint values is awaited. The release signal is issued only when all settings have been checked by the controller and found to be good. Then the vehicle is started and also the spraying process is initiated in the mentioned manner.

After a spraying end, preferably after the sequential deactivation of the spraying devices, either automatically or operator-guided, a compressed-air cleaning and emptying cycle of at least the spraying devices is carried out. In this way it is prevented that the spraying devices are added during a longer installation break.

It is also useful to permanently or removably integrate the spray system in a vehicle forming, at least one screed having road paver, with which by the driving movement from a largely linear installation start to a far-reaching line-shaped installation end, which are straight and transverse to the direction of travel, continuously , Built a ceiling layer, wherein the installation start or the installation end are used as the respective reference line L for activating and deactivating the sprayers. Preferably, however, the rear or front boundaries of the sprayed carpet are made a predetermined distance before the installation start or behind the installation end. Also in the transverse direction, it is expedient to make the spray carpet slightly wider than the built-in ceiling layer.

In a particularly comfortable manner, the respective reference line is placed virtually on a screen of the control device representing the travel path, and then becomes the approach of the spray devices after the acquisition of the travel movement the reference line is monitored until activation or deactivation. This can be done automatically by the computer or even by an operator.

An expedient embodiment of a paver is characterized in that in the spray system, a first spraying at 90 ° to the paver longitudinal axis in the front area for spraying the gap between the lanes of a chassis, two more spraying at 90 ° to the paver longitudinal axis in the rear area behind the lanes for spraying the first released lanes, and two are provided outside the lanes between the front and the rear either transversely movable to the paver longitudinal axis or pivotable relative to the paver longitudinal axis sprayer, each spraying device having multiple, distributed in the longitudinal direction of this spraying spray nozzles, individually, sequentially, in groups or together and optionally clocked to operate. This distribution of spraying offers the advantage of being able to use easily accessible areas on the paver for the sprayers, i. in the confined space between the rear of the chassis and the transverse distribution device of the screed to have to accommodate only very small spraying, but nevertheless to be able to produce an arbitrary wide spray carpet from the totality of spraying, and, advantageously, in spite of the proposed dislocations between the spraying rectilinear and transverse to the direction of travel movement to achieve front and rear boundaries of the sprayed carpet.

In the case of swiveling spray devices, these angle sensors are appropriately assigned to the control device in order to be able to regulate the pivoting adjustment cleanly, and on the other hand vary the dosage dependent on the angle and be able to determine the position of each spray nozzle with respect to a reference line exactly.

Furthermore, a distance measuring device connected to the control device is expedient, which is used for activating and deactivating the spraying devices.

Finally, a driving speed setting and detection device connected to or incorporated in the control device should also be provided, since, of course, the activation and deactivation of the spraying devices is dependent on driving speed, and the dosage should also take into account the driving speed.

Fig. 1

eine schematische Seitenansicht eines Straßenfertigers mit anmontierten Sprühmodulen für den Einbau einer bituminösen Decke mit Hilfe eines durchgehenden Haftschicht-Sprühteppichs aus eines aufgesprühten Bitumenemulsion,

Fig. 2

eine schematische Draufsicht zu Fig. 1,

Fig. 3

eine schematische Draufsicht zu Fig. 1, zur Erläuterung des Verfahrens zur Herstellung des Sprühteppichs, und

Fig. 4

eine Draufsicht auf die auf den Sprühteppich eingebaute Decke.

Reference to the drawings, embodiments of the subject invention will be explained. Show it:

Fig. 1

a schematic side view of a paver with mounted spray modules for the installation of a bituminous ceiling using a continuous adhesive layer sprayed carpet of a sprayed bitumen emulsion,

Fig. 2

a schematic plan view to Fig. 1 .

Fig. 3

a schematic plan view to Fig. 1 to illustrate the process for preparing the sprayed carpet, and

Fig. 4

a plan view of the built-in spray mat ceiling.

A paver F, namely a standard paver, for example, for smaller working widths, has a chassis 1, to the bottom of a chassis 2 (either a crawler chassis as shown, or as not shown a wheel gear) is mounted. At the front end of the chassis 1 a Gutbunker is provided, from which a bottom conveyor 8 (for example, a scraper belt or two adjacent scraper belts) leads to the rear end of the chassis 1. On the chassis a primary drive source M with an electronic control device C at an operating platform 4 is provided. Behind the rear end of the chassis 1, a transverse distribution device 5 is mounted, for example a distribution screw, behind which a screed 6 is arranged, which is articulated with Holmen 7 on the chassis 1 and towed.

It should be noted that the screed 6 as a so-called Ausziehbohle (as in Fig. 2 shown) has a base screed part and Ausziehbohlenteile 6a, so that the working width B is variable.

The paver F is complemented by a removably mounted spray S, if an adhesive layer of a bitumen emulsion is applied to the subgrade. If the paver F is used for installation work in which no adhesive layer is required, then the spray device S is either inoperative or will be partially or completely dismantled.

The spraying device S comprises a first spray module M1 on the operating platform 4, for example offset from the center of the operating platform 4 to the side. The first Spray module M1 contains components, inter alia, for storing, heating, filtering, circulating and discharging the bitumen emulsion and for a compressed-air cleaning cycle and is designed, for example, as block 13. In the first spray module M1, it is also possible to provide a spray control CU, for example an electric spray device. Alternatively, the spray control CU could also be mounted elsewhere in the paver F or integrated into the control device C. The first spray module M1 is connected via connecting lines, not shown, with the drive supply of the paver F, to obtain hydraulic and / or mechanical and / or electrical and / or electronic drive power from the paver itself. In one embodiment, not shown, the first spray module M1, however, could be designed to be self-sufficient with its own drive supply.

A second spray module M2 is attached to the chassis below the Gutbunkers 3, more precisely in the region of the front end of the conveyor device 8 with fasteners 10. The fasteners 10 may optionally be prepared on the paver M. The second spray module M has as spraying a transverse Sprühampe 11 with spray nozzles 12 and is connected via a laid inside or outside the paver line 9 with the first spray module M1. The spray ramp 11 applies the bitumen emulsion to the planum only within the lane width, so that the landing gear 2 does not travel in the bitumen emulsion.

The third spray module M3 is mounted behind the chassis 2 below the chassis 1 and has as spray two spraying ramps 11 'with spray nozzles 12, which spray only the lanes of the chassis 2, so that extends in the region of the transverse distribution device 5, an adhesive layer on the planum covers the working width B of the road paver interruption-free, or extends on both sides even slightly beyond.

Because of the extendable screed 6, 6a with the variable working width B, a fourth spray module M4 can be mounted which is arranged within the length of the chassis 1 between the second and third spray modules M1, M2, structurally separated therefrom, and with spraying ramps 14 as further spraying means the outside of the chassis 2 is fitted, which are mounted either on the chassis 2 or on the chassis. The fourth spray module M4 points per side according to Fig. 2 a spray ramp 14 which is mounted about a substantially vertical axis 15 between a largely folded to the outside position and a deployed position by an actuator 16 is pivotally adjustable. The fourth spray module M4 applies the bitumen emulsion to the remaining part of the working width B, ie to areas B3 and B3 'lying outside the landing gear 2.

The spray nozzles 12 at least in the spray ramps 14 are conveniently provided with shutters or valves 17, e.g. operated clocked. The spray nozzles 12 can be clocked simultaneously or cascade-like. The valves or closure elements 17 could also be arranged in the lines 9, or even in the first spray module M1. Optionally, the spray ramps 11, 11 ', 14 are only carriers of the spray nozzles 12, which are fed individually or in groups.

The spray control CU is designed so that, depending on the folding position, each spray ramp 14 is individually metered, that is, the strongest dose is applied when the spray ramp 14 is farthest out, and vice versa. Incidentally, the metering is carried out in dependence on the driving speed of the paver in Einbaufahrt to produce a uniform cohesive and thin as possible adhesive layer. This type of metering is expedient because the spray nozzles 12 overlap transversely to the working direction more strongly, the farther the spray ramp 14 is folded to the outside of the chassis 2, and then aufzubächten more adhesive per unit area than the other spray ramps 11, 11 '. For this purpose, also connected to the controller angle sensors 18 are installed.

In a modified, in Fig. 2 Dashed lines indicated embodiment instead of a spray ramp 14 per side in the fourth spray module M4 as sprayers per two spray ramps 14 'per page provided, which are unfolded and collapsed in the manner of a scissors mechanism. The substantially vertical axes X of the spraying ramps 14 are mounted as close as possible to the chassis 1. Since the spray nozzles 12 are arranged on the spraying ramps 14 of the fourth spray module with fixed intervals in the longitudinal direction of the spray ramps, and their distance from one another transversely to the direction of travel changes depending on the folding position, the spray control compensates CU in the dosage a consequent change in the output amount per Area unit depending on the folding angle.

The clocking of the spray nozzles 12, for example by valves, is carried out so that each spray nozzle is either fully open or fully closed, wherein the time ratio of closing time to opening time for influencing the application rate per unit area can be changed. Alternatively, even the degree of opening could be varied become. Thanks to this refined spray control, the sprayed carpet can be produced very uniformly and precisely with the correct, just sufficient dosage per unit area. This considerably increases the acceptance of the spray paver even among the building authorities, who have so far rejected the use of adhesives on account of their environmental impact and, above all, of the local loss of liability of the ceiling layer due to overdosing or underdosing.

In the Fig. 2 sprayers 14 shown (spray bars or spraying ramps with nozzles 12, or nozzle carriers with supply lines to the nozzles) could in an alternative embodiment be arranged transversely to the direction of travel R and be reciprocable.

Fig. 3 illustrated as a schematic plan view of the vehicle, such as the paver of Fig. 1 and 2 How to control the spraying system either manually or automatically to get an in Fig. 4 for a straight track, for example, relatively exactly rch-teckigen spray carpet T produce. Fig. 4 illustrates a completed construction section in which on a prepared by the spray system S spray carpet T a ceiling covering D has been installed. The sprayed carpet T has in this example straight track as well as the top layer D exact rectangular shape, which, preferably and not absolutely necessary, the sprayed carpet T over the outline of the ceiling layer D has an excess Y, so that the edge regions of the top layer D adhere properly. The sprayed carpet T has a front boundary V, which transverses the direction of travel R and straight over the working width B, and a rear boundary H, which also passes straight across the working width and transverse to the direction of travel. Similarly, the ceiling layer D has a mounting beginning A, the straight across the working width B and transversely to the direction of travel R passes, as well as a similar installation end E.

In order to be able to produce the sprayed carpet T in this form and in spite of the spraying devices 11, 11 ', 14, 14' displaced in the direction of travel R and transversely thereto, the method according to the invention is carried out either automatically or operator-guided. This is based on Fig. 3 explained.

Before the paver forming the vehicle with the spraying system is started, a spraying device 11, which extends transversely to the direction of travel of the vehicle, is placed on the planum in front of the spraying device 11 foremost (possibly directly below the same). This is done, for example, on a screen in the control device C, CU. Previously, set values for, for example, the traveling speed at installation, the working width B, and the spraying amount per unit area, and the like have been input to the control device. If the adhesive, for example a bitumen emulsion, should not have been heated yet, then the heating takes place, expediently with a regulation of the processing temperature. Subsequently, a circulation of the adhesive is switched on in the spray system and also the activation release of the spraying operation takes place. Then, for example, by the control device, a review of all previous settings, such as the temperature, the pressure, the circulation of the adhesive, the amount of dose, and the set travel speed, the positive result of this review is a release signal, which is displayed to the operator , Thereafter, the vehicle F is started or, if already started, set in motion. Then, the spraying operation is started, but still no spraying operations are performed.

Only when the spray device 11, which is at the forefront in the direction of travel, reaches a predetermined distance from the reference line L, or the reference line L, spraying starts from the nozzles of the spray device 11. The other spray devices 11 ', 14, 14' are still deactivated while the vehicle continues to drive.

Depending on the driving speed, e.g. is carried out by a gear pulse count on the hydraulic motor of the traction drive, or via another displacement measuring system or GPS-based, and also depending on the set working width B, the position of each spray nozzle 12 of the sprayers 14, also taking advantage of the information of the angle sensors, when reaching the reference line L or the predetermined distance before or behind detected and the individual spray nozzles 12 are each activated so that each spraying process begins exactly at the reference line L. The sprayers 11 'are still disabled. If, then, when proceeding, sprayers 11 'have finally reached the predetermined distance to or from reference line L, which is monitored, for example, by a displacement measuring system, sprayers 11' are also activated, so that they determine exactly at the reference line with the spraying processes.

In this way, a spray width corresponding to the working width B is laid. The start of work of the screed 6, 6a is relocated to the reference line L, namely expedient so that the installation start A, as in Fig. 4 shown shortly before the front boundary V of the sprayed carpet comes to rest.

If the route is processed and an operation stop or abort is scheduled, then the sprayers 11, 11 ', 14, 14' are deactivated in the reverse order, with the reverse sequence to form the rear boundary H. Finally, the installation in the ceiling layer D stops where the installation end E comes to rest slightly in the working travel direction of movement within the rear boundary H of the sprayed carpet T. This means that the spray nozzles 12 or the spray devices 11 'must be individually activatable and deactivatable depending on the movement movement, so that work can be carried out in this way.

The method can automatically via the control device, z. B. computer-performed or caused by the operator who monitors the processes visually, for example on the screen, and in parallel in nature.

After the end of work all sprayers are expediently blown out and cleaned by a manually initiated or automatic compressed air cleaning cycle as part of a program routine.

Claims (15)

1. Method for producing a continuous sprayed carpet (T) of a bonding agent on a planum, particularly from a bitumen emulsion, by a vehicle (F) having a spraying system (S) comprising at least two spraying facilities (11, 11', 14, 14') and a spraying control device (CU, C), at which vehicle (F) the spraying facilities are offset to each other in and crosswise to the travelling motion direction (R), each spraying facility comprising at least one spraying nozzle (12) and a controllable member (17) which is provided for at least activating and deactivating one spraying cycle, characterised in that during a travelling motion the sprayed carpet (T) is produced such that it has front and rear boundaries (V, H) which are continuous over the width of the sprayed carpet (T) and which are parallel to a respective stationary reference line (L) which is placed in front of a spraying facility (11) which is the frontmost one in travelling motion direction (R) on the planum crosswise to the travelling motion direction (R), the boundaries (V, H) being formed by activating or deactivating each of the spraying facilities (11, 11', 14, 14') in dependence on the travelling motion first at a predetermined distance from the or when reaching the respective reference line (L).
2. Method according to claim 1, characterised in that a spraying facility (11, 11') aligned at an angle of 90° with respect to the travelling motion direction (R) and having several spraying nozzles (12) which are distant from each other in longitudinal direction of the spraying facility, is activated and deactivated such that all spraying nozzles (12) start and terminate spraying cycles simultaneously.
3. Method according to claim 1, characterised in that a spraying facility (14, 14') which can be aligned at an angle different to an angle of 90° with respect to the travelling motion direction (R) and either has at least one spraying nozzle (12), preferably several spraying nozzles (12) which are distant from each other in longitudinal direction of the spraying facility, is activated or deactivated such that the or each respective spraying nozzle (12) starts or terminates a spraying cycle at a predetermined distance from the or when reaching the reference line (L).
4. Method according to claim 1, characterised in that the activation or deactivation of each spraying facility (11, 11') which is aligned at an angle of 90° with respect to the travelling motion direction (R) is carried out considering a measurement of the path distance to the reference line (L).
5. Method according to claim 1 characterised in that the activation or deactivation of each spraying facility (14, 14') which can be aligned at an angle (α) different to an angle of 90° with respect to the travelling motion direction (R) is activated or deactivated automatically or guided by an operator via a measurement of the distance to the reference line (L) and via a measurement of the angle (α) of the alignment of the spraying facility or via a position detection of each spraying nozzle (12) with respect to the reference line (L), preferably, depending on the working width (B) as adjusted by means of the angle (α) of alignment of the spraying facility.
6. Method according to at least one of the preceding claims, characterised in that first the respective reference line (L) is placed virtually,
   that the settings of target values of the travelling speed, the working width, the spraying amount per surface unit, and the like are input into the spraying control device (CU, C), preferably by means of a screen, and that the spraying system is switched into a standby condition,
   that the vehicle (F) is started to move,
   and that the respective spraying facility (11, 11', 14, 14') which is next to the reference line with the predetermined distance or which is reaching the reference line is activated automatically or by an operator.
7. Method according to claim 6, characterised in that prior to the start of the motion of the vehicle (F) the bonding agent is heated up in controlled fashion and is circulated in the spraying facility, and that for starting first a release signal is waited for which depends on the result of a check of the settings.
8. Method according to at least one of the preceding claims, characterised in that after a sequential deactivation of the spraying facilities (11, 11', 14, 14') a cleaning and emptying cycle at least of the spraying facilities is carried out with pressurised air.
9. Method according to at least one of the preceding claims, according to which method the spraying system (S) is fixedly or removably integrated into a road finisher (F) having at least one paving screed (6, 6a, 6b) and constituting the vehicle by which during a travelling motion a continuous cover layer (D) is laid down starting at a substantially line-shaped front boundary (A) to a substantially line-shaped rear boundary (E), each respectively extending crosswise to the travelling motion direction (R), characterised in that the front boundary (A) or the rear boundary (E) of the laid down cover layer (D) is used as the respective reference line (L) for activating or deactivating the spraying facilities (11, 11', 14, 14'), and that, preferably, the front boundary (V) and the rear boundary (H,) of the sprayed carpet (T) is produced with a predetermined distance (Y) in front of the front boundary (A) and behind the rear boundary (E) of the laid down cover layer (D).
10. Method according to claim 9, characterised in that the respective reference line (L) is placed virtually on a screen of the control device (C, CU) which screen displays the working travelling path, and that after the start of the travelling motion the approaching movement of the spraying facilities (11, 11', 14, 14') to the reference line are monitored until spraying facility activation or deactivation takes place.
11. Road finisher (F) having a spraying system (S), in particular for a bitumen emulsion, and a control device (C, CU) for both the road finisher and the spraying system (S), the spraying system (S) being equipped with at least two spraying facilities (11, 11', ', 14, 14') for producing a continuous sprayed carpet (T) on a planum, which spraying facilities are arranged offset to each other at the road finisher (F) in travelling motion direction (R) and crosswise to the travelling motion direction (R) and respectively are provided with at least one spraying nozzle (12) and a controllable member (17) at least for activating and deactivating a spraying cycle, characterised in that the spraying facilities (11, 11', 14, 14') are designed to be activated and deactivated one by one, that the control device (C, CU) is designed such that the sprayed carpet (T) in produced with front and rear boundaries (H, V) which are continuous over the working width of the sprayed carpet and extend parallel to a respective reference line (L) which is placed on the planum crosswise to the travelling motion direction (R), and in travelling motion direction (R) in front of the frontmost one spraying facility (11), and that each spraying facility is activated or deactivated automatically and depending on the travelling motion first when reaching a predetermined distance from the or when reaching the respective reference line (L).
12. Road finisher according to claim 11, characterised in that in the spraying system (S) a first spraying facility (11) is arranged at an angle of 90° to the longitudinal axis of the road finisher in the front region of the road finisher for spraying an intermediate space between travelling lanes of an undercarriage (2), two further spraying facilities (11') are arranged at an angle of 90° to the longitudinal axis of the road finisher in the rear region of the road finisher behind the travelling lanes to spray the bonding agent on the travelling lanes, and two further spraying facilities (14, 14') are arranged between the front region and the rear region of the road finisher and outside of the travelling lanes, which two further spraying facilities (14, 14') either can be displaced crosswise or can be pivoted relative to the longitudinal axis of the road finisher, and that each of the spraying facilities comprises a plurality of spraying nozzles (12) which are distributed in longitudinal direction of the respective spraying facility and which can be operated one by one, sequentially or commonly , and in some cases, cyclically.
13. Road finisher according to claim 12, characterised in that angle sensors (18) are associated to the two further pivotable spraying facilities (14, 14'), and that the angle sensors (18) are connected to the control device (C, CU).
14. Road finisher according to claim 11, characterised in that a path distance measuring device (W) is provided and is connected to the control device.
15. Road finisher according to claim 11, characterised in that a device for adjusting and for detecting the travelling speed is provided and either is connected to or is incorporated into the control device.

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