EP0479967A1

EP0479967A1 - Dowel fitting device.

Info

Publication number: EP0479967A1
Application number: EP91906661A
Authority: EP
Inventors: Michael Weinberger
Original assignee: THOMA ERHARD L
Current assignee: THOMA ERHARD L
Priority date: 1990-05-02
Filing date: 1991-03-27
Publication date: 1992-04-15
Anticipated expiration: 2011-03-27
Also published as: ES2049109T3; WO1991017314A1; EP0479967B1; DE59100662D1; DE4014098A1; US5273374A; DE4014098C2

Abstract

On décrit un appareil à placer les goujons pouvant être installé sur une machine de bétonnage à coffrage glissant (1). Dans le sens du déplacement (7), plusieurs bras pivotants (30) sont disposés avant la carrosserie (2) du véhicule et avant les installations (3, 11, 12) servant au compactage du béton (10). A l'extrémité des bras (30) se trouvent des dispositifs (33) de saisie des goujons. Les dispositifs (33) de saisie des goujons prennent, dans une position de chargement (33'), des goujons (31) dans un magasin (32). Après avoir pivoté, les dispositifs de saisie des goujons prennent une position de pose dans laquelle, vu dans le sens du déplacement, leur extrémité s'enfonce du côté avant et parallèlement au sens du déplacement, dans la zone où le béton (10) commence à devenir compact. C'est là que les goujons (31) sont éjectés.A dowel placing apparatus is disclosed which can be installed on a slipform concreting machine (1). In the direction of movement (7), several pivoting arms (30) are arranged before the body (2) of the vehicle and before the installations (3, 11, 12) serving for compacting the concrete (10). At the end of the arms (30) are devices (33) for gripping the studs. The stud gripping devices (33) take, in a loading position (33 '), studs (31) in a magazine (32). After being rotated, the stud gripping devices assume an installation position in which, seen in the direction of travel, their end sinks from the front side and parallel to the direction of travel, in the area where the concrete (10) begins to become compact. This is where the studs (31) are ejected.

Description

Title: Dowel setting tool

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

A dowel setting device of this type is 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 Figure 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. He dodges sideways and has to be explained again in the space between the carrier of the dowel setting device and the leveling plate .11 des Slipform paver are brought. In addition, this carrier 10 hinders the unloading of the concrete in front of the slipform paver, ie the concrete cannot be poured out directly in front of the leveling plate or the like of the slipform paver.

As is known, the slipform paver produces concrete 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 pressing plate. The dowel setting tool then places rows of dowels running 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. When 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 put the dowels behind the slipform paver, but according to the previously known dowel setting device before If slipform pavers are placed 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. The dowel setting therefore does not require any reworking of the concrete surface as is necessary with dowel setting devices, which are arranged behind the slipform paver when viewed in the direction of travel.

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 I said, 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 seen in the direction of travel of the slipform paver can be inserted into the concrete before the latter without thereby obstructing 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. 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 the dowels have been set swivels up, the work area is in front of the

Slipform pavers for spreading the concrete freely accessible during most of the working time. You can coordinate the application of the concrete and the setting of the dowels so that the dowel placement does not affect the application of the concrete at all.

The operation of the dowel setting device is not 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 expenditure when inserting the dowels into the concrete. The dowels can still be positioned very precisely. Any reworking for the purpose of smoothing is also omitted. 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 dowel is not disturbed. The spacing of the dowels can be freely selected by choosing the design 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 subclaims.

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 shows a dowel setter

Embodiment behind a slipform paver (only shown schematically);

Figure 2 is a plan view of Figure 1;

Figure 3 shows a dowel (31) at the end of a dowel receiver

(30);

Figure 4 shows the magazine (32) of the dowel inserter according to Figure

1 with the facilities for loading the dowels; Figure 4 corresponds to area IV in Figure 1;

Figure 5 shows a section along the line V-V in Figure

4; and Figure 6 is a representation corresponding to Figure 5, but with the omission of various parts in the upright position of the pivot bar (56).

Figure 1 shows schematically - in thin lines - a slipform paver 1, consisting of vehicle body 2, plank 3, frame 4 and crawlers 5, 6 attached to it. The slipform paver 1 moves in the direction of the arrow 7 shown. Concrete 10 is loosely piled up in front of it , evenly distributed 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 screed 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 he assumes the dash-dot position 20 'in the uppermost position. Then the plates have the position 23 '.

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 designated 31'. Then, by lowering the carrier 20 into the setting position shown in solid lines in FIG. 1, the dowels 31 are introduced into the not yet solidified concrete in the front area of the

Slipform paver l. In this position, the dowels 31 are then ejected from the bracket 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, a row of approx. 20 dowels lies 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 information 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 brackets 30 by means of the dowel receivers 33 shown in FIG. 3, which are arranged or provided at the end of the brackets 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, which has slots 42 in which neoprene inserts 43 are arranged, is arranged in the dowel receiving sleeve 38. If a dowel 31 is now accommodated 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 34 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 the engagement of a switching finger 53 in the switching groove 52, the shaft which is 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 elastically fixed 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 on its left side (in FIG. 4) two centering plates 57 '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 with the lower outer surface parts of the U-profile rails 47, .48.

If the cam disks 49, 50 are in the position shown in FIG. 6 and the swivel lever 56 is swiveled down from the upright position shown in FIG. 6 (which is shown in broken lines in FIG. 4), the shift 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-dotted lines because, owing to 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 carrier 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 is shown setting position. 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

PATENT CLAIMS

1. Dowel setting tool for use on one

Slipform paver (1) in which several booms in front of the devices (3,11,12) for compacting the concrete (10)

(30) are arranged in the form of dowel receivers (33), the dowel receivers (33) from a magazine (32) dowels

(31) and seen in the direction of travel, extend from the front into the area of compaction of the concrete (10) parallel to the direction of travel, and eject the dowels there, characterized in that the extension arms (30 ') face in the direction of travel (7) the vehicle body (2) is arranged so that the dowel receptacles (33) are located at the end of the arms (30) and that they start the dowels (31) from a swiveled loading position (33 ') in a seated position after swiveling.

2. Dowel setting device according to claim 1, characterized in that the boom (30) are arranged on a support (20) which is arranged transversely to the direction of travel, and that the pivoting operation of the boom (30) from the loading position to the setting position or vice versa by pivoting of the carrier (20).

3. Dowel setting device according to claim 2, characterized. that the carrier (20) is connected to plates (23, 24) which have rollers (17, 18) guided in different rails (47, 48), and that the pivoting process of the carrier with the arms (30) from the loading position to the setting position or vice versa by forcibly guiding the rollers (17, 18) in the guide rails (13, 14) during a lifting movement of the carrier (20).

4. Dowel setting device according to claim 1, characterized in that the boom (30) in the setting position from the top upward to the bottom inclined in the direction of travel (7) in the concrete (10).

5. Dowel setting device according to claim 1, characterized in that the dowel receiver (33) has a cylinder (34) in which a piston (36) is displaceable, that with the piston (36) a plunger (37) for ejecting the dowel ( 31) is connected, and that a dowel receiving sleeve (38) is arranged for receiving and holding the dowel (31) following the cylinder (34).

6. Dowel setter according to claim 5, characterized in that the dowel-holding neoprene inserts (43) are arranged in the dowel receiving sleeve (38).

7. Dowel setter according to claim 1, characterized in that the magazine (32) is formed by profile rails (47, 48) into which the dowels (31) can be inserted from above, and that the profile rails are closed on their underside by cam disks (49, 50), the cam disks each having a dowel receiving groove (51) which, while taking a dowel (31), can be pivoted into a position (FIG. 5) in which the dowel (31) is received by clamping members (54, 55) which are arranged on a swivel bar (56).

8. Dowel setter according to claim 7, characterized in that the swivel bar (56) from the first position in which it receives a dowel (31) can be pivoted into a position (FIG. 6) in which the boom (30) is moved by the dowel (31) is received in the dowel receiver (33).

9. Dowel setter according to claim 7, characterized in that the rotation of the cam disc (49, 50) takes place by engagement of a switching finger (53) in a switching groove (52) provided on the cam discs, the switching finger (53) on the swivel bar (56). is arranged.

10. Dowel setter according to claim 9, characterized in that a centering plate (67) with centering groove (68) is arranged at the free end of the swivel arm (56), which is movable up to the stop on the dowel receiver (33), with engagement of the centering groove the dowel sensor (33) is centered.