EP0479967B1 - Dowel fitting device - Google Patents

Abstract

The description relates to a dowel fitting device which can be inserted in a slip form paver (1). Several brackets (30) are pivotably arranged in front of the vehicle superstructure (2) and in front of the devices (3, 11, 12) for compacting the concrete (10), in the direction of travel. Dowel receivers (33) are located at the end of the brackets (30). In a loading position (33'), the dowel receivers (33) take dowels (31) from a magazine (32). After a pivoting cycle the dowel receivers assume a setting position in which, looked at in the direction of travel, they extend from the front into the region of initial compacting of the concrete (10) parallel to the direction of travel. The dowels (31) are pushed out at this point.

Description

The invention relates to a dowel setting device according to the preamble of patent claim 1.

A dowel setting device of this type has become known from DE-OS 22 59 040. This dowel setting device is characterized by a relatively simple structure, but this is purchased with a disadvantage that is not negligible in practice. According to FIG. 1 of the drawing of this prior publication, the carrier of this dowel setting device is constantly pushed through the loose concrete heaped up in front of the slipform paver. It dodges sideways and must be brought back into the space between the carrier of the dowel setting device and the leveling plate of the slipform paver in an unexplained manner. In addition, this carrier hinders the unloading of the concrete in front of the slipform paver, ie the concrete cannot be poured directly in front of the leveling plate or the like of the slipform paver.

The slipform paver is known to produce concreted surfaces such as roads, concrete slopes and the like in continuous motion. Trucks in front of the paver are loosely filled with liquid concrete. It is then distributed and smoothed by a auger which is arranged transversely to the direction of travel, and then compacted and smoothed by vibrators immersed in the liquid concrete and a subsequent press plate. The dowel setting device then places rows of dowels parallel to the direction of travel in the not yet solid concrete at predetermined intervals. If the latter has already set something, joints are milled into the concrete at this point across the dowels. As the concrete hardens further, the concrete slab will crack at these points. This creates individual, separate concrete slabs that are fixed against each other by the pre-pressed dowels. The dowels prevent these concrete slabs from displacing each other in terms of height and thereby forming thresholds.

If you do not insert the dowels behind the slipform paver, but according to the known dowel setting device in front of the slipform paver in the as yet unconsolidated concrete, this has the advantage that the concrete is not yet fully compacted and the surface has not yet been smoothed out. The dowel setting therefore does not require any reworking of the concrete surface as it is necessary for dowel setting devices that are seen in the direction of travel are arranged behind the slipform paver.

Dowel setting devices arranged behind the slipform paver have the advantage that they do not hinder the delivery of the concrete in front of the slipform paver. On the other hand, however, as mentioned, they require extensive rework.

It is therefore the task of developing a dowel setting device according to the preamble of claim 1 so that the dowels can be inserted into the concrete seen in the direction of travel of the slipform paver before the latter without hindering the laying of the concrete in front of the slipform paver.

To achieve this object it is proposed according to the invention that the dowel setting device is designed in accordance with the preamble of claim 1 in accordance with the characterizing part of this claim. This dowel setting device is attached to the slipform paver so that the cantilevers are in front of the vehicle body in the direction of travel, so that the dowels extend from the front into the area where the concrete begins to compact. However, because this dowel setting device or its dowel receivers are only briefly swiveled into the work area in front of the slipform paver and you put them back into a loading position immediately after placing the dowels swivels up, the working area in front of the slipform paver is freely accessible for spreading the concrete during most of the working time. The application of the concrete and the setting of the dowels can be coordinated with one another in such a way that setting the dowel does not impair the application of the concrete at all.

The operation of the dowel setting device is no more difficult and the workload is not less than that of the previously known dowel setting device. The same applies to the work and energy required when inserting the dowels into the concrete. The dowels can still be positioned very precisely. There is also no reworking for the purpose of smoothing. As a result, no screed is required behind the slipform paver with this dowel setting device. On the other hand, the dowel setting device is characterized by a short, compact design. Moreover, the known direction of movement when inserting the dowels has the advantage that the distribution of the concrete grain over the dowels is not disturbed. The spacing of the dowels can be freely selected by a suitable choice of the structural arrangement of the individual components (dowel receptacles). The dowels are inserted into the concrete along a special arch shape, which is already in motion by the vibrators at this point. The dowels are brought out of the dowel receptacles in a known manner precisely where the energy absorption of the concrete by vibrators (vibrators) stops, ie where the concrete is in its final position and the consolidation process begins. The control and expansion of the arrangement is particularly simple.

Advantageous developments of the invention are defined in the dependent claims.

Figur 1

ein Dübelsetzgerät nach einem Ausführungsbeispiel an einem (lediglich schematisch gezeigten) Gleitschalungsfertiger;

Figur 2

eine Draufsicht auf Figur 1;

Figur 3

einen Dübel am Ende eines Dübelaufnehmers;

Figur 4

das Magazin des Dübelsetzgeräts gemäß Figur 1 mit den Einrichtungen zum Laden der Dübel; Figur 4 entspricht dem Bereich IV in Figur 1;

Figur 5

einen Schnitt entlang der Linie V-V in Figur 4; und

Figur 6

eine Darstellung entsprechend Figur 5, jedoch unter Weglassung verschiedener Teile in aufrechter Stellung des Schwenkbalkens (56).

An embodiment of the invention and its advantageous developments is described in more detail below with reference to the accompanying drawings. They represent:

Figure 1

a dowel setting device according to an embodiment on a slipform paver (only shown schematically);

Figure 2

a plan view of Figure 1;

Figure 3

a dowel at the end of a dowel receiver;

Figure 4

the magazine of the dowel setting device according to Figure 1 with the facilities for loading the dowels; Figure 4 corresponds to area IV in Figure 1;

Figure 5

a section along the line VV in Figure 4; and

Figure 6

a representation corresponding to Figure 5, but omitting various parts in the upright position of the pivot bar (56).

Figure 1 shows schematically - in thin lines - a slipform paver 1, consisting of the vehicle body 2, screed 3, frame 4 and attached crawlers 5, 6. The slipform paver 1 moves in the direction of the arrow 7. Concrete 10 is loosely poured in front of it , distributed uniformly over the width of the pavement runway to be concreted by a distributor screw 11, compacted by vibrators 12 and further solidified by the press plank 3 and provided with a smooth surface. The slipform paver 1 then leaves the completely installed concrete 10 'behind it.

On booms 21, 22 (see FIG. 2), which are only indicated in FIG. 1, the vehicle body 2 carries guide profiles 13, 14 and 15, 16 on both sides. Rollers 17, 18 run on these guide profiles, which on plates 23 , 24 are attached, which in turn are connected to a carrier 20. If the carrier 20 is displaced in the vertical direction, it changes its position not only with regard to the height, but because the roller 17 in the guide profile 13 and the roller 18 in the guide profile 14 (or in the guide profiles 15, 16) run in such a way that that in the uppermost position it assumes the position 20 'shown in broken lines. Then the plates have the positions 23 ', 24'.

The height shift of the carrier 20 is carried out by a hydraulically driven chain drive. Details have been omitted from Figure 1 for the sake of clarity. However, the person skilled in the art knows how to install such devices.

There is a large number of brackets 30 on the carrier 20 which, when the carrier 20 is shifted in height, are shifted from the setting position shown in solid lines in FIG. 1 to the loading position 30 'shown in dash-dotted lines. In the loading position 30 ', the ends of the arms 30 receive dowels 31, which are provided from a magazine 32. The position of a dowel 31 in the boom in its loading position 30 'is denoted by 31'. Then, by lowering the support 20 into the setting position shown in solid lines in FIG. 1, the dowels 31 are introduced into the not yet finally solidified concrete in the front area of the slipform paver 1. In this position, the dowels 31 are then ejected from the boom 30 and then remain in their position. The slipform paver 1 and with it the boom 30 continue in the direction of arrow 7. The slipform paver 1 passes over the concrete, which is still liquid but increasingly subject to compaction and consolidation. The dowel 31 does not change its position in this more. As can be seen from FIG. 2, there is a row of approx. 20 dowels next to each other in the concrete. About 50 to 80 meters behind the slipform paver 1, a groove is then milled transversely to the longitudinal axis of the dowels 31 into the already solid, but not yet finally hardened and dried concrete. However, this distance specification is not to be interpreted restrictively. The decisive factor is the time interval; it depends on the temperature and the concrete composition and can be between a few hours and 2 days. In the course of the further hardening process of the concrete, the concrete ceiling tears along the groove, so that several panels are joined together, which are then connected to one another via the dowels 31.

The dowels 31 are received by the cantilevers 30 by means of the dowel receivers 33 shown in FIG. 3, which are arranged or provided at the end of the cantilevers 30.

The dowel receiver 33 has a cylinder 34 which is screwed into the bracket 30 with its left end (in FIG. 3) and can be pressurized with a hydraulic medium via a connection 35. A piston 36 is displaceable in the cylinder 34 and is connected to a tappet 37. A dowel receiving sleeve 38 is screwed into the end of the cylinder 34. Between the cylinder 34 and the dowel receiving sleeve 38 there is a disk 39 on which a spring 40 is supported, which follows the piston 36 in FIG left presses. A guide sleeve 41 is arranged in the dowel receiving sleeve 38 and has slots 42, in which neoprene inserts 43 are arranged. If a dowel 31 is now received in a guide sleeve 41 in the manner shown, it is therein, with the appropriate dimensions of the neoprene inserts 43, such that they are pressed together somewhat (in the radial direction towards the outside) when the dowel is inserted. This can be supported by the fact that when the connection 35 is subjected to low pressure, which also propagates through the opening 44 in the piston 36 into the interior of the cylinder 34, the guide sleeve 41 presses the neoprene inserts 43 in the axial direction and presses them thereby expanding somewhat radially. If the pressure at the connection 35 increases, then the piston 36 moves against the force of the spring 40 to the right and pushes the dowel 31 out of the dowel receiving sleeve 38 or the guide sleeve 41 in the direction of arrow 45 in the axial direction. This process takes place in the setting position (see FIG. 1).

The process of loading the dowel receiver 33, which is shown in FIG. 1 in the loading position 33 ', results in detail from FIGS. 4 to 6. Various devices that are shown there have been omitted from FIG. 1 for the sake of clarity.

6, the boom 30 is also in its loading position 30 ', the dowel receiver in its position 33', the dowel in position 31 '.

The magazine 32 is formed by two U-shaped rails 47, 48, into which dowels 31 are inserted from above. Cam plates 49, 50 are arranged on the underside of the profile rails 47, 48, offset somewhat inward relative to these. They prevent the dowels from falling out. Both cams have a dowel receiving groove 51; the cam plate 49 also has a switching groove 52. In the position shown in FIG. 6, the dowel receiving groove 51 receives a dowel 31 at the lower end of the shaft formed by the U-shaped rails 47, 48. If the cams 49, 50 are rotated by engagement of a shift finger 53 in the shift groove 52, the shaft formed by the U-shaped rails 47, 48 is closed at the bottom and at the same time the dowel 31 is brought into a position in which it 5, is clamped between leaf springs 54 and a guide plate 55. As can be seen, the leaf springs 54 and 54a are slightly rounded, so that at this point the dowel 31 between the guide plate 55 and the leaf spring 54 is fixed elastically in a defined position. As can be seen from FIG. 4, the leaf springs 54 are provided twice at a distance and screwed onto a swivel beam 56. This swivel beam 56 carries a centering plate 67 on its left side (in FIG. 4) and is welded on its right side to plates 57, 58 which are rotatably fastened to the boom 60 by means of shaft 59, which is machine-fixed, and that is arranged on a mounting bracket 61. Above the monthly carrier 61 there is a running surface 62 from which the magazine 32 can be loaded with dowels 31. A square tube 63 is also welded to the plates 57, 58. The pivoting of the swivel beam 56 relative to the extension arm 60 takes place by means of a hydraulically actuatable cylinder / piston arrangement 64. The cam disks 49, 50 can be rotated about the shaft 66. These are provided on the lower outer surface parts of the U-shaped rails 47, 48.

If the cam disks 49, 50 are in the position shown in FIG. 6 and the swivel bar 56 is swiveled down from the upright position shown in FIG. 6 (which is shown in dash-dotted lines in FIG. 4), the switching finger 53 engages in the switching groove 52 of the cam disks 49, 50 and thus turns the cams to the position shown in FIG. 5. A dowel 31 is thus pressed into the clamping position between the guide plate 55 and the leaf springs 54. If the swivel beam 56 is then swiveled up again, the centering disk 67, which for this purpose has a centering groove 68, is centered on the dowel receiving sleeve 38 (cf. FIG. 6; in FIG. 6, the centering disk 67 is shown in dash-dot lines because it follows the position of the Section VV is in front of the drawing level). This is done in that the groove engages around the dowel receiving sleeve 38 in a practically fork-like manner, so that the latter also serves as a stop at the same time. In this situation begins the downward movement of the carrier 20 with the arms 30 arranged thereon from the position 30 '(FIG. 1). In the first phase, the dowel receiving sleeve 38 then slides over the upper end of the dowel 31 in the position 31 'shown in FIG. 4. The dowel 31 lies on the square tube 63 for receiving. After recording, the swivel bar is pivoted back with the square tube 63, and with further downward movement of the support 20 along the somewhat more marked dash-dotted coupling curves in FIG. 1 moves so far down that after the swiveling process, the dowel 31 in FIG. 1 is solid Line shown setting position is. Then the connection 35 (see FIG. 3) is pressurized so that the dowel is ejected. As already explained, it is then in its final position.

Claims (10)

1. Dowel fitting device for fitting dowels or the like in concrete road surfaces, for use in a slip form paver (1), consisting of a holder (20, 23, 24, 30) with dowel receivers (33) and a magazine (32), wherein the dowel receivers (33) can load dowels (31) from the magazine (32) and can push out the dowels (31) in the setting position, characterised in that the dowel receivers (33) are located at the free ends of several brackets (30) and that the other ends of the brackets (30) are arranged to pivot from an upwardly pivoted loading position of the free ends into the setting position assumed following a pivoting cycle.
2. Dowel fitting device according to claim 1, characterised in that the brackets (30) are arranged on a bearer (20) which is arranged transversely to the direction of travel and that the pivoting cycle of the brackets (30) from the loading position into the setting position or vice versa is effected by pivoting the bearer (20).
3. Dowel fitting device according to claim 2, characterised in that the bearer (20) is connected to plates (23, 24) which have rollers (17, 18) guided in different guide rails (13, 14) and that the pivoting cycle of the bearer with the brackets (30) from the loading position into the setting position or vice versa is effected by controlled guiding of the rollers (17, 18) in the guide rails (13, 14) upon a movement of stroke of the bearer (20).
4. Dowel fitting device according to at least one of claims 1 to 3, characterised in that, in the setting position, the bracket (30) extends from the front at the top at a downward incline in the direction of travel (7) into the concrete (10).
5. Dowel fitting device according to at least one of claims 1 to 4, characterised in that the dowel receiver (33) has a cylinder (34) in which a piston (36) can be displaced, that a push rod (37) for pushing out the dowel (31) is connected to the piston (36) and that a dowel receiving sleeve (38) is arranged after the cylinder (34) for receiving and holding the dowel (31).
6. Dowel fitting device according to claim 5, characterised in that neoprene inserts (43) holding the dowel are arranged in the dowel receiving sleeve (38).
7. Dowel fitting device according to at least one of claims 1 to 6, characterised in that the magazine (32) is formed by profiled rails (47, 48) into which the dowels (31) can be inserted from above and that the profiled rails are sealed on their undersides by cam plates (49, 50), the cam plates each having a dowel receiving groove (51) which, taking up a dowel (31), can be pivoted into a position (Figure 5) in which the dowel (31) is received by clamping members (54, 55) which are arranged on a swivel beam (56).
8. Dowel fitting device according to claim 7, characterised in that the swivel beam (56) can be pivoted from the first position in which it receives a dowel (31) into a position (Figure 6) in which a dowel (31) is received in the dowel receiver (31) by moving the brackets (30).
9. Dowel fitting device according to claim 7 or claim 8, characterised in that the rotation of the cam plates (49, 50) is effected by the engagement of an indexing finger (53) in an indexing groove (52) provided on the cam plates, the indexing finger (53) being arranged on the swivel beam (56).
10. Dowel fitting device according to claim 9, characterised in that a centring plate (67) with a centring groove (68) is arranged at the free end of the swivel arm (56) and can be moved until it bears against the dowel receiver (33), centring being effected by the engagement of the centring groove with the dowel receiver (33).

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