Slipform paver

Abstract

The road construction machine according to the invention, in particular a slipform paver or a curing machine for freshly produced concrete layers, has a machine frame 1 supported by running gear 3A, 3B, 4A, 4B, on which a working unit 11 is provided, which has a working device 18 movable in a direction transverse to the working direction I, which is attached to a carriage 13, which is guided on a linear guide 12 extending transversely to the working direction. The carriage 13 is connected to a cable 15 deflected on one longitudinal side of the machine frame, the free ends of which are attached to the cable drum 19 of a winch 16 on the other longitudinal side of the machine frame, so that the carriage can be moved transversely by rotating the cable drum.The road construction machine is characterized by the fact that the cable drum 19 has a first and a second drum half 20, 21, with one end of the cable 15 attached to one drum half 20 and the other end of the cable to the other drum half 21. The cable winch 16 can assume a first operating mode in which the first and second drum halves 20, 21 are connected to each other such that the carriage 13 is moved by rotating the first and / or second drum half. The cable winch 16 can assume a second operating mode in which the first and second drum halves 20, 21 are rotatable relative to each other in at least one direction of rotation, so that the cable tension can be adjusted by a relative rotational movement of one drum half with respect to the other drum half.

Description

[0001] The invention relates to a road construction machine, in particular a slipform paver or a curing machine for freshly produced concrete layers, with a machine frame supported by running gears on which a working device is provided.

[0002] Road construction machines include slipform pavers, which are equipped with a slipform for placing concrete. These well-known slipform pavers allow for particularly economical concrete placement. The concrete to be placed is placed in front of the slipform paver in the direction of travel. To ensure even distribution of the concrete across the entire paving width, the slipform paver is equipped with a distribution device positioned in front of the slipform in the direction of travel.

[0003] Slipform pavers are known whose distribution device features a slider that can be moved transversely to the working direction, allowing the concrete to be distributed transversely. The slider, also known as a distribution blade, is attached to a carriage that is guided along a linear guide running transversely to the working direction.

[0004] To move the carriage, traction cables can be attached to the sides of the carriage. These cables can be wound up or unwound using cable winches located on the long sides of the slipform paver, allowing the carriage to be moved transversely with the placing blade. In an alternative embodiment, the carriage can be connected to a cable deflected on one long side of the slipform paver, the free ends of which are attached to the cable drum of a cable winch on the other long side of the machine frame, allowing the carriage to be moved transversely by rotating the cable drum.

[0005] To create a particularly smooth concrete surface, slipform pavers can also be equipped with a smoothing device located behind the slipform in the working direction. Slipform pavers are known whose smoothing device comprises a trowel attached to a carriage, which is guided along a linear guide running transversely. Two traction cables can be provided to move the carriage, which are wound up and unwound using cable winches. Alternatively, only one cable winch can be provided, with the cable being redirected to one side of the slipform paver.

[0006] Known curing machines used for curing freshly finished concrete layers can also be equipped with such a working device with a transversely movable working device. In these curing machines, the working device can be a texturing device for texturing the freshly finished concrete, and the working device can be a brush element that can be moved in a direction transverse to the working direction. However, the working device can also be a spraying device for spraying the freshly finished concrete with a liquid, with the working device being a transversely movable spray head for applying the liquid.

[0007] Road construction machines are known that allow for variable adjustment of different working widths. The machine frame of these road construction machines features telescopic frame sections and / or the machine frame is designed in such a way that frame sections can be inserted into or removed from the existing machine frame to increase the working width.

[0008] A slipform paver with a variable working width, which has a distribution device as a working device, whose working device (distributing blade) is moved in the transverse direction by means of two cables, which are wound up or unwound on cable winches arranged on both sides of the machine frame, is known from EP 1 068 397 B1, as well as from DE 299 24 218 U.

[0009] A post-treatment machine with a working device which has a spray head as a working device is known from EP 2 886 717 A1.

[0010] Road construction machines equipped with work equipment of the type described above face the problem of adjusting and maintaining the rope tension required for proper operation of the equipment. Experience has shown that rope tension can decrease if the machine is not in operation for an extended period of time. However, rope tension can also decrease overnight, for example due to temperature changes, requiring retensioning the rope the following day. Furthermore, changing the working width of the road construction machine presents the problem of adjusting the free length of the rope. This requires winding or unwinding the rope on the drum, and then readjusting the rope tension.

[0011] In road construction machines equipped with two cable winches, the working width can be changed and the cable tension adjusted by operating the cable winches, which are used to wind up or unwind the cables. The disadvantage, however, is that this design requires two separate cable winches. In a design with only one cable winch, a cable clamp can be provided on the carriage to release the cable. A disadvantage, however, is the relatively high force required to manually tension the cable. Tensioning the cable also proves to be relatively time-consuming. In addition, releasing the cable clamp and tensioning the cable requires work in a hazardous area directly in front of the road construction machine.

[0012] The invention is based on the object of creating a road construction machine, in particular a slipform paver or a curing machine for freshly produced concrete layers, which has a working device of the type described above, in which the tensioning of the cable is simpler, faster and safer.

[0013] This object is achieved according to the invention with the features of the independent patent claims. The dependent claims relate to preferred embodiments of the invention.

[0014] The road construction machine according to the invention, in particular a slipform paver or curing machine for freshly produced concrete layers, comprises a machine frame supported by running gears, on which a working device is provided, which comprises a working device movable in a direction transverse to the working direction, which is attached to a carriage guided on a linear guide extending transversely to the working direction. The carriage is connected to a cable deflected on one long side of the machine frame, the free ends of which are attached to the cable drum of a cable winch on the other long side of the machine frame in such a way that the carriage can be moved transversely by rotating the cable drum. A linear guide is understood to mean all components that allow the carriage to be guided transversely, for example, guide rods, profile rail systems, tongue and groove systems, etc.A carriage refers to all components that are guided in a transverse direction. The carriage can be guided either by sliding or by rollers.

[0015] The road construction machine according to the invention is characterized in that the cable drum has a first and a second drum half, with one end of the cable being attached to one drum half and the other end of the cable being attached to the other drum half. In this context, "a" cable is also understood to mean a cable composed of several cables or cable sections that are connected to one another in such a way that tensile forces can be transmitted. For example, the free ends of two cable sections can be connected to one another by being attached to the carriage, thus forming a single cable.

[0016] The cable winch is designed in such a way that the cable winch can assume a first operating mode in which the first and second drum halves are connected or coupled to one another in such a way that rotating the first and / or second drum halves in one direction or the other moves the carriage in one direction or the other. The first operating mode corresponds to normal operation in which the carriage is moved transversely with the work equipment. In this operating mode, the connection between the first and second drum halves does not need to be rigid. What is crucial is that the connection allows the required torque to be transferred from one drum half to the other in order to move the carriage to the left or right during operation of the road construction machine under load, provided that the drive is only on one of the two drum halves.The drive of each drum half can be done by means of a hydraulic, pneumatic or electric motor drive unit.

[0017] The cable winch is further designed such that it can assume a second operating mode in which the first and second drum halves can be rotated relative to one another in at least one direction of rotation, such that the cable tension can be adjusted by a relative rotation of one drum half relative to the other drum half. To rotate one drum half relative to the other drum half, one of the two drum halves can be held in place while the other drum half is rotated. The respective drum half can be driven hydraulically, pneumatically, or by an electric motor. The drive unit for the second operating mode can be the drive unit for the first operating mode. However, separate drive units can also be provided.

[0018] Consequently, in the first operating mode, the two drum halves form a "single rope drum" with which the rope can be wound or unwound without changing the free rope length. In the second operating mode, however, the two drum halves form "two rope drums," allowing the free rope length to be changed. The two drum halves can therefore also be understood as two separate rope drums that can be coupled or decoupled from each other, i.e., separated from each other.

[0019] One embodiment of the cable winch provides that the first drum half has at least one first connecting element and the second drum half has at least one second connecting element, wherein the at least one first and second connecting element are designed such that in the first operating mode a non-positive connection is established between the first and second connecting elements. The connecting elements can, for example, be clutch discs that allow a non-positive connection in order to be able to transmit the torque required to move the carriage. The non-positive connection can be released by at least one of the two drum halves being moved in the axial direction so that the clutch discs are arranged at a distance from one another. A suitable adjustment mechanism can be provided for this purpose. This adjustment mechanism can, for example, have an adjusting screw.The drum halves can also be adjusted using a piston / cylinder arrangement, for example. The clutch discs can also be designed to function as a slip clutch, whereby the transmittable torque is still sufficiently large that the carriage can be moved in the first operating mode and the drum halves can be rotated relative to each other in the second operating mode. In this case, an adjustment mechanism is not required. The connecting elements can be an integral part of the drum halves or form separate components.

[0020] An alternative embodiment provides that the first drum half has at least one first connecting element and the second drum half has at least one second connecting element, wherein the at least one first and second connecting element are designed such that a positive connection is established between the first and second connecting elements in the first operating mode. The connecting elements can, for example, have claws or external or internal toothings that are engaged in the first operating mode and disengaged in the second operating mode. To release the connecting elements, an adjustment mechanism for axially moving the drum halves can be provided in this embodiment.

[0021] A particularly preferred embodiment provides that the cable winch is designed such that the first and second cable drums form a coupling that operates only in one direction of rotation, so that the first drum half and the second drum half, respectively, can only be rotated in one direction of rotation. This direction of rotation is preferably the direction in which one drum half must be rotated to tension the cable when the other drum is held in place.

[0022] In the particularly preferred embodiment, the first drum half can have at least one locking piece and the second drum half can have at least one spring-loaded pawl, wherein the at least one locking blade engages in the at least one locking piece. The two drum halves can be rotated against each other to tension the cable, wherein the locking effect in one direction of rotation facilitates tensioning because the cable system remains under the set pretension. The required torque can be easily transmitted in one direction of rotation. Torque transmission in the other direction of rotation, i.e. opposite to the locking effect, can be made possible by rigidly connecting the two drum halves. The rigid connection can be made, for example, with a screw or a bolt or other electromagnetically, hydraulically or pneumatically actuated locking elements.However, a locking device is not necessary if the freewheel is designed in such a way, for example if the spring preload of the pawl is dimensioned in such a way that the two drum halves are held together in the other direction of rotation to such an extent that the required torque is transmitted.

[0023] The first drum half can have a plurality of locking pieces that are arranged circumferentially distributed at predetermined intervals around a rotational axis of one of the two drum halves, and the other of the two drum halves can have a plurality of locking pawls that are arranged circumferentially distributed at predetermined intervals around a rotational axis of the drum half. This makes it possible to connect one drum half to the other drum half in different intermediate positions. A particularly large number of intermediate positions can be achieved by coordinating the predetermined intervals at which the locking pieces of one of the two drum halves are arranged and the predetermined intervals at which the locking pawls of the other of the two drum halves are arranged in a vernier manner.

[0024] In order to completely separate the first drum half and the second drum half, the two drum halves can, in the particularly preferred embodiment, be axially displaceable relative to one another between a first position in which the at least one pawl engages with the at least one locking piece, and a second position in which the at least one pawl does not engage with the at least one locking piece. When both drum halves are completely separated from one another, the rope can be wound up or unwound from one of the two rope drums when the working width is increased or decreased. A suitable adjustment mechanism can be provided for axially displacing the drum halves. This adjustment mechanism can, for example, have a setscrew. However, the drum halves can also be adjusted using a piston / cylinder arrangement, for example.

[0025] To tension or wind or unwind the rope, only a relative movement of the drum halves is required. For this purpose, both drum halves or just one of the two drum halves can be rotated, with only one rotary drive on one side or rotary drives on both sides of the rope drum being provided. Preferably, only one rotary drive is provided to drive the first drum half, which can be arranged on the inside facing the machine frame. The rotary drive can thus be attached to the machine frame.

[0026] A further embodiment provides a locking device designed such that one of the two drum halves can be locked relative to the machine frame. If only one of the two drum halves is to be driven, the second drum half can be locked by means of the locking device.

[0027] The locking device can comprise a perforated body on one of the two drum halves with holes arranged circumferentially around the rotational axis of the drum half, and a stationary frame associated with the drum half with a bore, so that a bolt for locking the drum half can be pushed through the bore of the frame into one of the holes. However, locking can also be achieved by means of other locking devices, for example, by means of a braking device acting on the cable drum or its drum half.

[0028] The road construction machine can be a slipform paver, the machine frame of which has a right frame part running in the working direction and a left frame part running in the working direction, between which a slipform is arranged, wherein the working device is a distribution device arranged in front of the slipform in the working direction for distributing the concrete to be placed in a direction running transversely to the working direction, wherein the working device is a slider movable in the transverse direction.

[0029] The road construction machine can also be a slipform paver, the machine frame of which has a right frame part running in the working direction and a left frame part running in the working direction, between which a slipform is arranged, wherein the working device is a smoothing device arranged behind the slipform in the working direction for smoothing the freshly produced concrete, and the working device is a smoother movable in a direction running transversely to the working direction.

[0030] In addition, the road construction machine can also be a curing machine for freshly produced concrete layers, wherein the working device is a texturing device for texturing the freshly produced concrete, and the working device is a brush element movable in a direction transverse to the working direction, or the working device is a spraying device for spraying the freshly produced concrete with a liquid, wherein the working device is a spray head movable in a direction transverse to the working direction.

[0031] The advantages of the invention become particularly apparent when the machine frame of the road construction machine and the linear guide of the working device are designed for variable adjustment of different working widths, so that not only the problem of adjusting the cable tension, but also the adaptation of the free cable length to the different working widths arises. The required cable tension can be achieved quickly and easily by turning one or both drum halves. The cable supply can be distributed between both drum halves. This is particularly advantageous if the cable supply is not evenly distributed between the two drum halves, but rather the majority of the cable supply is located on one of the drum halves. The cable can be retensioned on one side of the road construction machine outside the danger zone.The rope can be re-tensioned manually on one side only or with a single rotary drive on one side only. With suitable drive units and adjustment mechanisms, the rope tensioning and setting of the appropriate free rope length can also be carried out partially or fully automatically.

[0032] In the following, embodiments of the invention are described in detail with reference to the drawings.

[0033] They show: Fig. 1 is a schematic plan view of a slipform paver with a variable working width as an example of a road construction machine, which has a front and rear working device in the working direction. Fig. 2 is a schematic plan view of a curing machine for freshly produced concrete layers with a variable working width as an example of a road construction machine, which has a working device. Figs. 3A, 3B and 3C are a schematic plan view of a first embodiment of the cable winch of the working device to illustrate the functional principle. Figs. 4A and 4B are a schematic plan view of a second embodiment of the cable winch. Fig. 5A is a plan view of one of the two drum halves of the cable drum of the cable winch, showing a third embodiment of the cable drum.Fig. 5B shows the other of the two drum halves of the cable drum of the cable winch of the third embodiment in plan view, and Fig. 5C shows a pawl of the cable drum of the third embodiment.

[0034] Fig. 1 shows a slipform paver as an example of a self-propelled construction machine in a highly simplified schematic representation.

[0035] The slipform paver has a machine frame 1 supported by a chassis 2. The chassis 2 comprises a front, left-hand crawler track 3A and a front, right-hand crawler track 3B in the working direction I, and a rear, left-hand crawler track 4A and a rear, right-hand crawler track 4B in the working direction. The crawler tracks are attached to the machine frame by means of front, left, and right lifting devices 5A, 5B and rear, left, and right lifting devices 6A, 6B.

[0036] The machine frame 1 comprises a left frame section 7A in working direction I, a right frame section 7B, and a middle frame section 8. The middle frame section 8 can be lengthened or shortened to change the working width of the slipform paver. For this purpose, piston / cylinder arrangements 9 (only indicated in outline) can be provided, or individual frame sections 8A can be inserted into or removed from the middle frame section 8.

[0037] Between the outer frame parts 7A, 7B, a slipform 10 is arranged, running transversely to the working direction, for producing a concrete layer for a roadway. The slipform 10 also has a variable working width, for example, by inserting and removing individual slipform segments 10A.

[0038] In addition, the slipform paver comprises a front working device 11 in working direction I, which is arranged in front of the slipform 10, and a rear working device 11' in working direction I, which is arranged behind the slipform in working direction.

[0039] The front and rear working devices 11, 11' each comprise a longitudinal guide 12 running transversely to the working direction, on which a carriage 13 is guided in the transverse direction, as well as a cable pull system 14 for moving the carriage. The same reference numerals are used for the corresponding parts of the working device. The working width of the longitudinal guide 12 can also be changed by inserting and removing longitudinal guide parts 12A. The cable pull system 14 of the two working devices has a cable 15 running in the transverse direction, which is wound up or unwound by means of a cable winch 16 on the left in working direction I and is deflected on a deflection pulley 17 on the right in working direction I. The carriage 13 is attached to the cable 15. A working device 18, 18' is attached to the carriage 13.

[0040] If the working width of the slipform paver is changed, the width of the working equipment 11, 11' must be adjusted. To do this, the free cable length of the cable pull system 14 must be adjusted. Furthermore, tensioning or retensioning of the cable 15 is required for the proper functioning of the cable pull system 14. The structure and function of the cable pull system 14 are described in detail below.

[0041] The front working device 11 is a distribution device for distributing the concrete to be placed in a direction transverse to the working direction across the entire working width. The working device 18 is a pusher, also known as a distribution blade. The rear working device 11' is a smoothing device for smoothing the freshly poured concrete. The working device 18' is a trowel.

[0042] Fig. 2 shows, as an example of a self-propelled construction machine with a working device, a curing machine for freshly produced concrete layers. The components corresponding to the slipform paver are designated by the same reference numerals. In the curing machine, the working device 11" can be a texturing device for texturing the freshly produced concrete, wherein the working device 18" is a brush element movable in a direction running transversely to the working direction I. However, the working device 11" can also be a spraying device for spraying the freshly produced concrete with a liquid, wherein the working device 18" is a spray head movable in the transverse direction.

[0043] The Figuren 3A, 3B and 3Cshow a simplified schematic representation of a first embodiment of the cable winch 16 of the cable pulling system 14. The cable winch 16 has a cable drum 19, which comprises a first and a second drum half 20, 21. The first and second drum halves 20, 21 are rotatably mounted on the machine frame 1 about a common rotation axis 22. Fig. 3A shows the cable winch 16 in the first operating mode and Fig. 3C shows the cable winch in the second operating mode. Fig. 3B shows a view of the front side of the cable drum 19 from a direction opposite to the working direction I.

[0044] The first drum half 19 is driven by a drive unit 23 provided on the machine frame 1. The drive unit 23 can, for example, comprise a hydraulic motor or an electric motor.

[0045] The first and second drum halves 20, 21 each have a connecting element 20A, 21A on their end faces, which in the present embodiment is a clutch disc with a clutch lining. The two drum halves 20, 21 are spring-loaded against each other in the axial direction, pressing the clutch discs together. The torque transmittable by the clutch discs is sufficient to allow the carriage 13 to be moved during operation of the road construction machine. The transmittable torque is determined by the design of the clutch discs and the contact pressure.

[0046] The free ends of the rope 15 deflected on the pulley 17 are fastened in opposite directions to the rope drum 19. The free end of the upper rope section ( Fig. 3B ) is attached to the first drum half 20 ( Fig. 3A ), and the free end of the lower rope piece ( Fig. 3B ) is on the second drum half 21 ( Fig. 3A ) so that when the cable drum 19 rotates clockwise A (as viewed from a direction opposite to the working direction I), the incoming, upper cable section is wound onto the first drum half 20 and the outgoing, lower cable section is unwound from the second drum half 21. Consequently, the carriage 13 attached to the upper cable section is moved with the working device 18, 18', 18" in the direction of arrow a ( Fig. 1 , Fig. 3A, Fig. 3B ) from right to left (seen in the working direction) ( Fig. 1 ). However, the carriage can also be attached to the lower section of the rope, which reverses the direction of movement. Rotating the rope drum counterclockwise B causes the implement to move in the direction of arrow b, from left to right (as seen in the working direction). Consequently, the implement can be moved in both directions a, b, which corresponds to the first operating mode.

[0047] To tension the cable 15, the cable winch 16 has a locking device 24 attached to an outer frame 1A of the machine frame 1. In the present embodiment, this locking device has a hydraulically, pneumatically, or electromagnetically actuated locking element 24A, for example a bolt, which is displaceable. The second drum half 21 has a perforated body 25 on its outer side with holes 25A arranged circumferentially around its rotational axis 22, into which the locking element 24A, which can be advanced through a bore 1AA in the frame 1A, can engage in order to lock the second drum half 21 to the stationary frame 1A. Instead of a locking device with an automatically actuated locking element, a bolt can also be pushed manually through the bore 1AA into one of the holes 25A for locking.

[0048] To set the second operating mode, the second drum half 21 is locked by means of the locking device 24 ( Fig. 3C ). To tension the rope 15 in the second operating mode, the first drum half 20 is rotated clockwise A by means of the drive unit 23, while the second drum half 21 is held in place. The two drum halves 20, 21 act as a slip clutch ( Fig. 3C ), which corresponds to the second operating mode.

[0049] To adjust the free rope length to a reduced or increased working width, the second drum half 21 is locked and the first drum half 20 is turned clockwise A or counterclockwise B, which corresponds to the second operating mode.

[0050] To control the drive unit 23 and the locking device 24, a control unit 26 ( Fig. 3A ), which may be part of the central control unit (not shown) of the road construction machine. The drive unit 23 and the locking device 24 are connected to the control unit 26 via control lines 23A, 24C. The control unit 26 can be configured such that the individual process steps for tensioning the cable or for adjusting the free cable length are carried out fully automatically.

[0051] The Figuren 4A and 4B show an alternative embodiment in which the connecting elements do not produce a force-locking connection, but a form-locking connection. The corresponding parts are designated by the same reference numerals. The connecting element 20A of the first drum half 20 has, in the present embodiment, Figuren 4A and 4Bonly vaguely shown claws 20AA, which engage in corresponding recesses 21AA provided on the second drum half 21, so that a positive connection is established.

[0052] In the alternative embodiment, the cable winch has an adjusting device 27 designed such that the first drum half 20 is movable in the axial direction relative to the second drum half 21. The adjusting device 27 can comprise hydraulic, pneumatic, or electromagnetic drive means, for example a piston / cylinder arrangement, which are connected to the control unit 26 via a control line 27A. The control unit 26 can again be configured such that the individual method steps for tensioning the cable or for adjusting the free cable length are carried out fully automatically. However, the adjusting device 27 can also comprise, for example, a manually operated adjusting screw.

[0053] To tension the cable 15, the control unit 26 actuates the adjusting device 27 such that the first cable drum 20 is moved from a first position in which the claws 20AA are engaged ( Fig. 4A ), is moved in the axial direction into a second position in which the claws 20AA are disengaged ( Fig. 4B ). In addition, the control unit 26 actuates the locking device 24 such that the second drum half 21 is locked. After the second drum half 21 has been locked, the control unit 26 starts the drive unit 23 so that the cable 15 is wound onto the first cable drum 20 for tensioning (clockwise direction of rotation A, viewed from a direction opposite to the working direction I) or, in the case of a change in the working width to shorten or lengthen the free cable length, the cable is wound onto or unwound from the first cable drum 20 (direction of rotation A or B, respectively). The first cable drum 20 is then moved back into the first position and the locking device 24 is released again ( Fig. 4A ).

[0054] The Figuren 5A , 5B und 5C show in a simplified schematic representation a further alternative embodiment which differs from the embodiment of the Figuren 4A and 4B differs in that the cable winch 16 is designed such that the first and second drum halves 20, 21 form a coupling acting only in one direction of rotation. Structure and function of the cable winch 16 from the Figuren 5A , 5B und 5C otherwise correspond to the design of the Figuren 4A and 4B . The cable winch 16 therefore also has the Figuren 4A and 4B illustrated drive unit 23, locking device 24 and adjusting device 27 as well as the control unit 26. Fig. 5A shows a plan view of the front side of the first drum half 20, while Fig. 5B shows a plan view of the front side of the second drum half 21.

[0055] On the front side of the first drum half 20, locking pieces 20AB are provided, distributed circumferentially around its rotational axis 22 at predetermined intervals ( Fig. 5A ). The second drum half 21 has locking pawls 21AB arranged on the front side around its rotational axis 22 at predetermined intervals, which engage in the locking pieces 20AB in the first position of the drum halves ( Fig. 5B ), so that the drum halves 20, 21 form a freewheel. Fig. 5C shows one of the plurality of pawls 21AB engaging one of the plurality of locking pieces 20AB. The pawl 21AB is provided with a Fig. 5C not shown spring is spring-loaded so that a force F acts on the pawl, whereby the pawl is supported with a first contact surface 28A on a stop surface 28B on the front side of the second drum half 21 and is supported with a second contact surface 29A on a second stop surface 29B on the locking piece 20AB of the first drum half 20. If the first drum half 20 is rotated relative to the fixed second drum half 21 in the direction of arrow A, which corresponds to the direction of rotation A in Fig. 4A corresponds, the locking piece 20AB engages the pawl 21AB at its inclined surface 30, so that the pawl moves in the direction of arrow C ( Fig. 5C ) (freewheel). A rotation of the first drum half 20 in the opposite direction B ( Fig. 5C ) is not possible, however, because the pawl 21AB blocks rotation in this direction. Therefore, the torque required to move the implement 18, 18', 18" can be easily transmitted in the direction of rotation B. The spring tension F can be dimensioned such that, in the event that the first cable drum 20 is driven by the drive unit 23 in the direction of rotation A and the locking device 24 releases the second cable drum 21 (first operating mode), the torque required to move the implement in both directions (left and right) can be transmitted without the clutch slipping.

[0056] To tension the cable 15 or to shorten the free cable length, the second drum half 21 is locked, while the first drum half 20 is rotated in the direction of rotation A. The predetermined distances between the locking pieces 20AB of one of the two drum halves 20 and the predetermined distances between the locking pawls 21AB of the other of the two drum halves 21 are aligned in the manner of a vernier scale. This creates a multitude of locking positions, allowing the cable tension to be adjusted in relatively small increments.

[0057] However, when the first drum half 20 is in the first position, the free rope length cannot be extended because the "clutch is engaged" (cf. Fig 4A ). To extend the free rope length, the first drum half 20 is moved by means of the adjusting device 27 into the second position in which the locking blades 21AB are disengaged (cf. Fig. 4B ). The first drum half 20 is then rotated in the direction of rotation B, so that the rope 15 can unwind from the first drum half 20. The second drum half 21 does not need to be locked for this purpose.

Claims

1. Road construction machine, in particular slipform paver or curing machine for freshly manufactured concrete layers, comprising a machine frame (1) supported by running gears (3A, 3B; 4A, 4B), on which machine frame a working device (11) is provided, which has a working means (18) that can be moved in the direction running transversely to the working direction (I), which working means is fastened to a carriage (13) which is guided on a linear guide (12) running transversely to the working direction, characterised in that the carriage (13) is connected to a cable (15) that is deflected on one longitudinal side of the machine frame (1), the free ends of which are fastened to the cable drum (19) of a cable winch (16) on the other longitudinal side of the machine frame (1) in such a way that the carriage (13) can be moved in the transverse direction by rotating the cable drum, the cable drum (19) having a first and a second drum half (20, 21), one end of the cable (15) being fastened to one drum half (20) and the other end of the cable being fastened to the other drum half (21), and in that the cable winch (16) is designed in such a way that the cable winch can assume a first operating mode in which the first and second drum halves (20, 21) are connected to one another in such a way that rotating the first and / or second drum halves in one direction or the other causes the carriage (13) to move in one direction or in the other direction, and the cable winch can assume a second operating mode, in which the first and second drum halves (20, 21) can be rotated in opposite directions at least in one direction of rotation, so that the cable tension of the cable (15) can be adjusted by rotating one drum half relative to the other drum half.

2. Road construction machine according to claim 1, characterised in that the first drum half (20) has at least one first connecting element (20A) and the second drum half (21) has at least one second connecting element (21A), the at least one first and second connecting elements (20A, 21A) being designed in such a way that in the first operating mode a non-positive connection is established between the at least one first and second connecting elements.

3. Road construction machine according to claim 1, characterised in that the first drum half (20) has at least one first connecting element (20A) and the second drum half (21) has at least one second connecting element (21A), the at least one first and second connecting elements (20A, 21A) being designed in such a way that in the first operating mode a positive connection is established between the at least one first and second connecting elements.

4. Road construction machine according to claim 1, characterised in that the cable winch (16) is designed in such a way that the first and second drum halves (20, 21) form a clutch which acts only in one direction of rotation.

5. Road construction machine according to claim 4, characterised in that one of the two drum halves (20) has at least one locking piece (20AB) and the other of the two drum halves (21) has at least one spring-loaded locking pawl (21AB), the at least one locking blade (21AB) engaging in the at least one locking piece (20AB).

6. Road construction machine according to claim 5, characterised in that one of the two drum halves (20) has a plurality of locking pieces (20AB) which are arranged circumferentially distributed around an axis of rotation (22) of the drum half at predetermined intervals, and the other of the two drum halves (21) has a plurality of pawls (21AB) distributed circumferentially around an axis of rotation (22) of the drum half at predetermined intervals.

7. Road construction machine according to claim 6, characterised in that the predetermined intervals at which the locking pieces (20AB) of one of the two drum halves (20) are arranged and the predetermined intervals at which the pawls (21AB) of the other of the two drum halves (21) are arranged are matched to one another in the manner of a nonius, so that the drum halves can assume a variety of locking positions.

8. Road construction machine according to any of claims 5 to 7, characterised in that the first drum half (20) and the second drum half (21) are axially displaceable relative to each other between a first position, in which the at least one pawl (21AB) engages in the at least one locking piece (20AB), and a second position, in which the at least one pawl (22AB) is disengaged from the locking piece (20AB).

9. Road construction machine according to any of claims 1 to 8, characterised in that the cable winch (16) has a locking device (24) which is designed in such a way that one of the two drum halves (20, 21) can be locked in relation to the machine frame (1).

10. Road construction machine according to claim 9, characterised in that a perforated body (25) is provided on one of the two drum halves (21) having holes (25A) arranged circumferentially around the axis of rotation (22) of the drum half and a stationary frame (1A) assigned to the drum half (21) having a bore (1AA), so that a locking element (24A) can be pushed through the bore (1AA) of the frame (1A) into one of the holes (25).

11. Road construction machine according to any of claims 1 to 10, characterised in that the cable winch (16) has a drive unit (23) for driving one of the two drum halves (20, 21).

12. Road construction machine according to any of claims 1 to 11, characterised in that the road construction machine is a slipform paver, the machine frame (1) of which has a right-hand frame part (7B) running in the working direction (I) and a left-hand frame part (7A) running in the working direction, between which a slipform (8) is arranged, the working device (18) being a distribution device arranged in the working direction (I) in front of the slipform (8) for distributing the concrete to be paved in a direction running transversely to the working direction (I), the working means (18) being a pusher that can be moved in the transverse direction.

13. Road construction machine according to any of claims 1 to 11, characterised in that the road construction machine is a slipform paver, the machine frame (1) of which has a right-hand frame part (7B) running in the working direction (I) and a left-hand frame part (7A) running in the working direction, between which a slipform (8) is arranged, the working device (11 ') being a smoothing device arranged behind the slipform (8) in the working direction (I) for smoothing the freshly manufactured concrete, and the working means (18') being a smoother movable in a direction extending transversely to the working direction.

14. Road construction machine according to any of claims 1 to 11, characterised in that the road building machine is a curing machine for freshly manufactured concrete layers, the working device (11") being a texturing device for texturing the freshly manufactured concrete, and the working means (18") being a brush element that can be moved in a direction running transversely to the working direction, or the working device (11") being a spraying device for spraying the freshly manufactured concrete with a liquid, the working means (18") being a spray head which can be moved in a direction transverse to the working direction.

15. Road construction machine according to any of claims 1 to 14, characterised in that the machine frame (1) of the road construction machine and the linear guide (12) of the working device (18', 18", 18") are designed for variable setting of different working widths.

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