EP0865539A1

EP0865539A1 - Bridge inspection system

Info

Publication number: EP0865539A1
Application number: EP96943873A
Authority: EP
Inventors: Alfons Moog
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-07
Filing date: 1996-12-06
Publication date: 1998-09-23
Anticipated expiration: 2016-12-06
Also published as: AU1365197A; ATE186351T1; EP0865539B1; DE59603598D1; DE19681064D2; WO1997020988A1

Abstract

A bridge inspection system is designed specifically for moving along the underside of bridges (1) and comprises the following: a chassis (2) capable of travelling along the length of the bridge; a frame (3) mounted on the chassis (2) for gripping around a bridge rail (4), sound-proofing wall or the like; a support device (5) which can pivot and rotate on the frame (3) and can be laid against the bridge (1); and a lifting tower (6) which can be hung into or onto the chassis (2) or frame (3), said tower having an adjoining working platform (7). The system is intended for use on bridges (1) with rails (4), sound-proofing walls etc. of differing heights. It is based on a safe yet simple design such that the frame (3) is telescopically height-adjustable at least in the outer region.

Description

"Device for bridge inspection"

The invention relates to a device for bridge inspection, in particular for driving on the underside of bridges, with a chassis which can be moved in the longitudinal direction of the bridge, a frame which is placed on the chassis and which serves to grip over a bridge railing, a soundproofing wall or the like. and rotatably articulated support device which can be placed on the bridge and a lifting tower which can be suspended in or on the chassis or in the frame with an adjoining working platform.

Devices of the type in question have been known in practice for some time. By way of example only, reference is made to DE 31 24 183 A1 for documentation of the relevant prior art.

The previously known devices for bridge inspection comprise as essential components a narrow-track chassis which has supports that can be attached to the structure or the bridge to prevent the device from tilting to the side. A walkable boom is rotatably mounted about a vertical axis, so that on the one hand support arms and on the other hand a work platform can be pivoted under the bridge.

However, the device for bridge inspection known from practice or from DE 31 24 183 A1 is problematic in use to the extent that the chassis is connected to the boom or a mast supporting the boom via rigid frame parts. In this respect, the use of the device in question is limited insofar as the height of the frame specifies the height of the obstacles that can be driven over, for example bridge railings or soundproof walls. If the known device for bridge inspection is to be universally applicable, the frame of the known device must have sufficiently high vertical frame legs. If the bridge railing is extremely low, such high frame legs ensure inadequate and, to this extent, unnecessarily reduced stability. In any case, an adaptation to the structural conditions of the bridge is not possible with the known device. The present invention is therefore based on the object of designing and developing a device for bridge inspection of the type mentioned at the outset such that use on bridges with railings of different heights, soundproofing walls or the like is possible on the basis of a safe and simple construction with sufficient stability.

The device according to the invention achieves the aforementioned object by the features of patent claim 1. According to this, a device for bridge inspection of the type mentioned at the outset is designed in such a way that the height of the frame can be adjusted, at least in the outer region.

According to the invention, it has been recognized that an optimal adaptation of the device to the structural conditions of a bridge, in particular to the railings, soundproof walls or the like provided there, is possible if the frame carried by the chassis at least in the outer area, i.e. in the area serving to accommodate the lifting tower, is height adjustable. In the case of such a structural design, the assembly of the device which overlaps the bridge railing or the soundproofing wall can be adapted optimally, so that the overall height of the frame which is just required to reach over the chassis or the soundproofing wall can be set in each case. This effectively avoids an unnecessary overall height of the frame and the acceptance of a reduced stability or even instability of the frame caused thereby.

From the point of view of universal use of the device according to the invention, the undercarriage comprises a single-track undercarriage which can preferably move at the outer end of a walkway laid on the bridge. This is an area that can accommodate the highest possible load on the walkway on the bridge. The single-track design of the chassis has the enormous advantage that an extremely narrow lane is sufficient to move the device. The entire frame is part of the chassis, but is discussed in isolation below. For the safe support or movement of the undercarriage, it advantageously has a plurality of support wheels, pairs of support wheels or groups of support wheels. It is essential that the undercarriage can be moved in the longitudinal direction, the orientation of the support wheel pairs specifying the direction of travel. More specifically, the chassis can have vertically arranged support wheels running on the floor and horizontally arranged support wheels running on an inner wall of the bridge or the bridge railing or a soundproofing wall.

The frame placed on the chassis - as a link between the chassis and the lifting tower - has in the working position at least largely vertical inner and outer frame legs, the inner frame legs being assigned to the chassis and the outer frame legs of the support device or the lifting tower . The height adjustability of the frame advantageously results from the fact that at least the outer vertical frame legs, but preferably also all vertical frame legs, can be extended telescopically. The vertical frame legs are actuated hydraulically or pneumatically.

For a stable design of the frame legs, in particular for realizing a stable overlapping of a bridge railing or a soundproof wall, the inner frame legs assigned to the undercarriage can be rigidly connected to the outer frame legs via transverse struts, so that the frame is U-shaped overall. Depending on the number of inner and outer frame legs, there are several U-profiles of the frame, which are in turn connected transversely to one another. This connection can be provided on the side of the inner frame legs or on the side of the outer frame legs.

Now, when using the device according to the invention, the problem often arises that any obstacles hinder or even prevent the device from continuing to travel in the assembled state. For example, lampposts or flagpoles, which cannot be dismantled, can be arranged in the immediate vicinity of the bridge railing. So that the device for Overcoming such obstacles does not unnecessarily have an excessively extendable frame or does not have to be (partially) dismantled each time, the frame overlapping the bridge railing or the soundproofing wall can advantageously be designed in such a way that the outer ones — assigned to the support device - Frame legs are firmly connected to each other and that the inner frame legs are each pivotable or foldable out of the lane in the direction of the outer frame legs, preferably upwards, via a foldable parallel arm linkage, individually and individually. However, it would also be conceivable to make individual frame legs detachable.

Due to this design, there is now the possibility that frame legs for frame legs are pivoted out of the working area to overcome any obstacles in the course of the advancement of the device, the inner frame legs remaining in the lane in each case ensuring sufficient stability or vertical support of the device. The pivoting of the inner frame legs out of the lane preferably takes place over the outer edge of the bridge, so that the frame leg which is given away can move freely past the obstacle. After overcoming the obstacle, the frame leg is then swiveled back into the lane and can be supported on the road or on the sidewalk.

In the manner mentioned above, the frame legs are swung away shortly before the obstacle and swung back into the working position or lane after overcoming the obstacle. The working position of the support device or even the lifting tower with the adjoining work platform is in no way impaired by this. A quick overcoming of any kind of obstacles is therefore possible regardless of the height of the obstacles, because these obstacles cannot be overcome by overlapping the obstacles on the part of the frame, but rather by swinging away individual frame parts. The overall height of the frame therefore no longer plays a role. For bearing against the bridge or on the outside of the bridge jib or the railing, for guiding the lifting tower and finally also to favor a safe support, the support device preferably comprises two support wheels articulated on outer vertical frame legs, which run essentially horizontally in the direction of travel. Since the outer vertical frame legs can also preferably be adjusted telescopically in length, the location used to support the support wheels can be precisely specified according to the height of the bridge railing to be overlapped or the soundproofing wall to be overlapped. The frame legs in question or the support wheels carried by the outer frame legs are preferably positioned to lie as low as possible against the outer region of the bridge.

To ensure a particularly high level of stability of the device, the support device further comprises at least one support arm which is articulated on an outer vertical frame leg, can be pivoted under the bridge, can be supported from the underside against the bridge and is at least largely horizontal in its working position. The vertical frame leg carrying the support arm can be extended telescopically, so that an optimal adaptation to the structural conditions of the bridge is possible. The support arm itself can also be extended telescopically, so that it extends far enough under the bridge. For the actual support, the support arm comprises at least one support which runs essentially vertically or extends orthogonally upward from the support arm with an end-side support wheel which rolls vertically in the direction of travel. This jockey wheel is used to rest against the underside of the bridge and, by retracting or shortening the frame leg supporting the support arm and / or by extending the support, reaches the bridge securely.

To further improve the stability, the support arm has two spaced-apart, essentially vertical supports, each with an end support wheel, the support which is furthest from the lifting tower or frame leg or its support wheel essentially absorbs the support forces. For further The supports carrying the support wheels can also be telescopically extendable to match the structural conditions.

In a particularly advantageous manner and in order to promote a further secure stand of the device, the support facing the frame leg or its support wheel in the working position is arranged approximately under the support wheel or under the support wheels of the undercarriage, provided that the bridge construction permits. This means that the support wheels of the chassis with the support wheel of the support in question - if possible - approximately in alignment.

With regard to a further advantageous embodiment of the support device, a total of two support arms, preferably arranged parallel to one another, each with two supports and support wheels carried vertically in the direction of travel and carried by the supports can be provided. These support arms are articulated to vertically arranged frame legs which run parallel to one another, the frame legs carrying the support arms in turn being connected to one another by transverse struts.

In any case, it is essential for the previously discussed support device that the entire device is supported on the bridge exclusively via support wheels that can be unrolled in the longitudinal direction of the bridge - vertically and horizontally. The movability of the device is thus in no way impaired or even impeded by the support. A method of the device is thus also with a fully effective support device, i.e. in the working position of the entire device, possible.

As already stated at the beginning, the device comprises a lifting tower which can be suspended in or on the chassis or in the frame, with a working platform adjoining it. In concrete terms, the lifting tower can be articulated on the outer vertical frame legs, for which purpose a receptacle for the lifting tower or for the guide carriage of the lifting tower is provided. The lifting tower can advantageously be hooked onto the outer frame legs or brought into engagement with the guide slide there. The guide carriage advantageously comprises guide parts, in particular guide rollers, so that the lifting tower can be displaced vertically, with the sliding or rolling guide implemented. is easily possible. The lifting tower can in any case be guided vertically in the guide carriage, so that a vertical movement stroke of approximately 5 m is possible, the vertical lowering depth being between 7 and 8 m depending on the length of the tower.

As already mentioned before, a work platform connects to the lower end of the lifting tower. An additional platform for work in the area of the cantilever arms of the bridge can be attached above this work platform and below the support device already discussed above. The additional platform can be extended to adapt to the structural conditions of the bridge. To reach the working platform on the one hand and the additional platform on the other hand, the lifting tower comprises an internal access which extends up to the lower part of the lifting tower. The individual areas of the lifting tower or the working platforms can thus be reached from within the lifting tower.

The work platform can be swiveled under the bridge to set up the device. For this purpose, the working platform is pivoted or pivoted to the lower part of the lifting tower via a turntable provided at the lower end of the lifting tower. The lifting tower itself can be moved vertically, so that any area or location under the bridge can be reached with the working platform or the additional platform.

On the side of the turntable opposite the work platform, a machine room is further advantageously formed, in which electrical, hydraulic and possibly pneumatic energy supplies and control devices are provided. Likewise, installations of hoist winches for pillaring, including the rope winders required for this, can be accommodated in the machine room. It is also essential for the work area that, in particular with long work platforms, it also serves as a counterweight. With short working platforms, such a counterweight in the form of a machine room is not absolutely necessary.

A pillar access device is arranged below the work platform and can be moved along the work platform. To accommodate the pillar access device A rail is provided below the work platform, which extends from the slewing ring or machine room to the free end of the work platform. In this respect, the machine room is of further importance as a counterweight, since the pillar access device contributes to an increased tilting moment when the end of the working platform facing the bridge is reached.

As mentioned before, the lift tower is accessible or serves as a step up to the work platform. The work platform itself is designed similarly to the lifting tower and can therefore also be walked on. Provided for exiting the work platform into a pillar access device arranged underneath. The work platform has at least two access flaps in the floor for climbing onto the pillar drive device. One of the access flaps is provided in the area of the lifting tower, so that the pillar access device can be accessed directly from the lifting tower.

The pillar access device comprises a base platform and at least one additional platform attached to the side. It is also possible to provide an additional platform on both sides of the base platform, so that overall a T-shaped structure results. The base platform can have a length of approx. 3.5 m and is operatively connected to the work platform or the rail arranged under the work platform via a suspension that engages at both ends. Furthermore, a suspension platform can be assigned to the pillar access device or its base platform and / or the work platform. Here too, for reasons of a uniform weight distribution, it is of particular advantage to provide suspension platforms arranged on both sides. In any case, the additionally provided suspension platforms enable an inspection of the bridge pier up to the middle on the face side.

There are now various possibilities for designing and developing the teaching of the present invention in an advantageous manner. For this purpose, reference should be made on the one hand to the claims subordinate to claim 1, and on the other hand to the following explanation of an embodiment of the invention with reference to the drawing. In connection with the explanation of the preferred embodiment of the invention with reference to the drawing, the General preferred refinements and developments of the teaching and the structure of the device according to the invention explained. In the drawing shows

Fig. 1 in a schematic side view of an inventive

Device for bridge inspection in the operating state,

2 shows a schematic side view of the object from FIG. 1 with the lifting tower lowered further and with a suspension platform assigned to the working platform,

3 shows a schematic front view of a first exemplary embodiment of the frame of the object from FIG. 1 carrying the support device,

4 shows the object from FIG. 3 in a schematic side view,

5 shows a schematic front view of the device according to the invention in the assembled state, the frame having special measures for driving around obstacles,

6 is a schematic side view of the object of FIG. 5,

7 shows the frame of the object from FIGS. 5 and 6 in an enlarged front view,

Fig. 8 is a schematic side view of the subject of Fig. 7 and

9 to 20 in schematic representations the individual steps of the construction of a device according to the invention on a bridge. 1 and 2 each show schematic side views of an inventive device for bridge inspection in the assembled state, ie in the operating state. This device serves for driving on the underside of a bridge 1, which is only indicated schematically in the figures, and has a chassis 2 which can be moved in the longitudinal direction of the bridge. A chassis 3 is attached to the chassis 2 and is used to reach over a bridge railing 4. Furthermore, the device comprises a support device 5 which is pivotably and rotatably articulated on the frame 3 and can be placed on the bridge 1, and a lifting tower 6 which can be suspended in or on the chassis 2 or in the frame 3. The lifting tower 6 closes a work platform 7 in the lower area.

According to the invention, the frame 3 is height-adjustable, which results from an overall view of the figures.

The chassis 2 of the exemplary embodiment of a device according to the invention selected in the figures comprises a single-track undercarriage 8, this undercarriage 8 comprising a plurality of support wheels 9 which roll vertically and horizontally in the direction of travel. Alternative configurations can be seen in particular from FIGS. 3 to 8, wherein the frame 3 can be assigned individual support wheels 9, support wheel pairs or groups of support wheels, which - arranged individually or in groups - all form a common lane.

Figures 3 to 8 show particularly clearly that the frame 3 has vertically extending inner and outer frame legs 10, 11, the inner frame legs 10 being assigned to the chassis 8 and the outer frame legs 11 to the support device 5. In Figures 1, 2 and Figures 3 to 8 is indicated that the vertical frame legs 10, 1 1 are telescopically extendable, the actuation of the frame legs 10, 11 or the telescopically interlocking elements is carried out hydraulically.

In the exemplary embodiment shown in FIGS. 1 to 4, the inner frame legs 10 are rigidly connected to the outer frame legs 11 by means of cross struts 12, so that the frame 3 is U-shaped overall. In the further exemplary embodiments shown in FIGS. 5 to 8, the outer frame legs 11 are firmly connected to one another. The inner frame legs 10 can each be pivoted or folded out of the lane via a foldable parallel arm linkage 13 - individually - in the direction of the outer frame legs 11, preferably upwards, so that an obstacle can be avoided by pivoting away an inner frame leg 10. After overcoming the obstacle, the inner frame leg 10 is brought back into its working position, so that the next frame leg 10 can be folded away or pivoted away. Removing individual frame legs 10 from the lane would also be conceivable. In any case, it is essential that the frame 3 is not lifted as a whole in order to overcome the obstacle, but rather that individual inner frame legs 10 are moved out of the lane. The entire device remains in the working position.

In FIGS. 1 to 8 it is also indicated that the support device 5 comprises two support wheels 15 which are articulated on outer vertical frame legs 14 and serve to rest or guide on the outside of the bridge 1. These support wheels 15 are arranged or supported such that they roll laterally - at least largely horizontally - along the bridge 1 in the direction of travel of the device.

Figures 1 to 8 further show that the support device 5 two articulated on two outer vertical frame legs 16, pivotable under the bridge 1, from the underside against the bridge 1, in the working position at least largely horizontal support arms 17 includes. These support arms 17 can also be extended telescopically. Each of the support arms 17 in turn comprises two vertical supports 18, each with an end support wheel 19, which also rolls against the bridge 1 in contact with the device in the direction of travel of the device. The supports 18 can be extended telescopically, so that an optimal adaptation to the structural conditions of the bridge 1 is possible.

Figures 1 and 2 and 4, 6 and 8 show that the frame legs 11 and 14 and 16 facing supports 18 or their Support wheels 19 are arranged in the working position approximately under the support wheels 9 of the chassis 8. Optimal support is provided by this measure in conjunction with the support wheels 15 facing the bridge. The supports 18 facing the lifting tower 6 with support wheels 19 also provided there serve only to increase operational safety, but only absorb supporting forces to a minor extent.

3 further shows that the frame legs 16 carrying the support arms 17 are connected to one another by cross struts 20. This achieves a certain increase in stability.

1 and 2 as well as in FIG. 6 indicate that a receptacle (not shown in more detail) for the lifting tower 6 or its guide carriage is provided on the outer vertical frame legs 11 and 16, respectively. To avoid repetition, reference is made to the general part of the description.

1 and 2 show particularly clearly that an additional platform 21 for work in the region of the cantilever arm 22 of the bridge 1 is attached to the lifting tower 6 below the support device 5 and above the work platform 7. The additional platform 21 can be extended to adapt to the structural conditions of the bridge 1 and is located directly below the support device 5 in the embodiment shown in FIGS. 1 and 2.

The lifting tower 6 comprises an internal access 23 to the lower part 24 of the lifting tower, so that the working platform 7 can be walked on from there. The working platform 7 is in turn articulated to the lower part 24 of the lifting tower 25 by means of a turntable 25 provided at the lower end of the lifting tower 6. A machine room 26 is formed on the side of the turntable 25 opposite the work platform 7, which also serves as a counterweight for the work platform 7. Electrical, hydraulic and pneumatic energy supplies 27, on the one hand, and installations 28 of elevator winches for pillar access including the cable winders, on the other, are accommodated in the machine room 26. 1 and 2 can also be seen that below the work platform 7 a pillar drive device 29 which can be moved along the work platform 7 is provided. To accommodate the pillar access device 29 below the work platform 7, a rail, not shown in the figures, is provided, which extends from the slewing ring 25 or machine room 26 to the free end of the work platform 7. The work platform 7 in turn has two access flaps 30 for climbing onto the pillar drive device 29. One of the access flaps 30 is provided in the area of the lifting tower 6, so that the pillar access device 29 parked under the lifting tower 6 for static reasons is accessible from there. With regard to a specific configuration of the pillar access device 29, reference is also made to the general part of the description.

Additional platforms can be provided on both sides of the base platform 31 of the pillar access device 29, so that overall a T-shaped construction results. For reasons of clarity, a corresponding illustration in the figures has been omitted.

In any case, it is indicated in FIGS. 1 and 2 that the base platform 31 or the pillar access device 29 is operatively connected to the work platform 7 or the rail arranged under the work platform 7 via a suspension 32 which engages at both ends. The cables of the suspension 32 extend to the machine room 26 and are actuated from there.

Finally, it is indicated in FIG. 2 that the work platform 7 is assigned a suspension platform 33, by means of which a more extensive inspection of the underside of the bridge or the bridge pillar is possible. For reasons of symmetry or for reasons of a uniform weight distribution, two suspension platforms 33 are provided here, of which only one is shown for the sake of clarity.

9 to 20 show the individual work steps for the construction of the device according to the invention. The following: As shown in FIGS. 9 and 10, the entire device is loaded onto the trailer 34 of a truck 35. A crane, not shown in the figures, is required to set up the device. The trailer 34 is placed on the bridge 1 for construction and the vertical position is checked. The crane suspension 36 is suspended from the eyes of the undercarriage 8 so that the undercarriage 2 with the undercarriage 8, frame 3 and support device 5 can be lifted off the trailer 34 (FIG. 11). Thanks to the telescopic frame legs of the frame, this or the chassis has an acceptable transport height.

FIGS. 12 to 15 show the placement and construction of the assembly initially lifted from the trailer 34, the chassis 2 being placed on the edge of the bridge. The vertical position of the chassis 2 must also be observed here (Fig. 12).

In a next step, the outer vertical frame legs 16 with the support arms 17 hinged to them are telescopically extended downward (FIG. 13) and pivoted through 90 ^° under the bridge 1 (FIG. 14). The hydraulics are supplied by a smaller emergency unit.

According to the illustration in FIG. 15, the outer vertical frame legs 16 are then retracted telescopically until the support wheels 19 of the supports 18 move with pressure against the underside of the bridge. 15 already shows the state in which the support device 5 is activated as a whole. At this point the crane suspension 36 can be unhooked again.

In a next step, the lifting tower 6 is now brought into its vertical position on the trailer 34 by means of the crane by 90 ^° (see FIG. 16). In the vertical position, the lifting tower 6 is then locked and the transport locks can be released (Fig. 17). Then the lifting tower 6 is lifted from the crane together with the working platform 7. The working platform 7 is pivoted with the lifting tower 6 raised over the pillar access device 29 and the suspension 32 is suspended on the working platform 7 (FIG. 18). Additional platforms are also mounted on the pillar access device 29 or on its base platform 31, so that the pillar device 29 has a T-shape in plan view. Finally, the entire unit, ie the lifting tower 6, the working platform 7 and the pillar access device 29 is lifted off the trailer 34 (FIG. 19) and either lowered from the bridge or raised from below the bridge and into the outer frame legs 11 or hooked into a guide provided there. In the suspended state, the work platform 7 can be moved or swiveled together with the pillar access device 29 and the additional platforms under the bridge 1 (20). Finally, the hydraulics - possibly pneumatics and electrical lines - are connected. The diesel engine is started and a function check can take place. The device according to the invention is thus ready for use.

Finally, it should be particularly pointed out that the exemplary embodiment of a device for bridge inspection according to the invention discussed above was chosen purely arbitrarily to discuss the claimed teaching. However, the teaching claimed is not restricted to this by the purely arbitrarily chosen exemplary embodiment.

Claims

claims

1. Device for inspection of bridges, in particular for driving on the underside of bridges (1), with a chassis (2) that can be moved in the longitudinal direction of the bridge, one placed on the chassis (2), for gripping over a bridge railing (4), a soundproofing wall or the like . serving frame (3), on the frame (3) pivotally and rotatably articulated, can be placed on the bridge (1) support device (5) and in or on the chassis (2) or in the frame hookable lifting tower (6 ) with an adjoining work platform (7), characterized in that the frame (3) is adjustable in height at least in the outer region.

2. Device according to claim 1, characterized in that the chassis (2) comprises a single-track undercarriage (8).

3. Apparatus according to claim 2, characterized in that the chassis (8) has a plurality of support wheels (9), pairs of support wheels or groups of vertically and optionally horizontally running support wheels.

4. Device according to one of claims 1 to 3, characterized in that the frame (3) has at least largely vertically extending inner and outer frame legs (10, 11), the inner frame legs (10) the chassis (8) and the outer Frame legs (11) of the support device (5) are assigned.

5. The device according to claim 4, characterized in that the vertical frame legs (10, 11) are telescopically extendable.

6. The device according to claim 5, characterized in that the vertical frame legs (10, 11) can be actuated hydraulically or pneumatically.

7. Device according to one of claims 4 to 6, characterized in that the inner frame legs (10) via cross struts (12) are rigidly connected to the outer frame legs (11), so that the frame (3) overall U-shaped is trained.

8. Device according to one of claims 4 to 6, characterized in that the outer frame legs (11) are firmly connected to each other and that the inner frame legs (10) each via a foldable parallel arm linkage 13 - individually - in the direction of the outer frame legs (1 1 ), preferably upwards, can be swiveled out or folded out of the lane.

9. Device according to one of claims 1 to 8, characterized in that the support device (5) preferably two on outer vertical Rahmenschen¬ legs (14) articulated, to rest on the outside of the bridge (1) serving, hori¬ zontal running support wheels (16).

10. Device according to one of claims 1 to 9, characterized in that the support device (5) at least one on an outer vertical frame leg (16) articulated, under the bridge (1) pivotable from the bottom against the bridge ( 1) supportable support arm (17) which extends at least largely horizontally in its working position.

11. The device according to claim 10, characterized in that the support arm

(17) can be extended telescopically.

12. The apparatus of claim 10 or 11, characterized in that the support arm (17) has at least one substantially vertical support (18) with a vertically running end support wheel (19).

13. The apparatus of claim 10 or 11, characterized in that the support arm (17) two spaced apart, substantially vertical supports

(18) each with a vertically running end support wheel (19). 14. The apparatus according to claim 12 or 13, characterized in that the support (18) is telescopically extendable.

14. Device according to one of claims 12 to 14, characterized in that the frame leg (16) facing support (18) or its support wheel (19) in the working position approximately under the support wheel (9) of the chassis (8) ¬ is classified.

15. Device according to one of claims 10 to 14, characterized in that the support device (5) comprises two support arms (17) preferably arranged parallel to one another.

16. The apparatus according to claim 15, characterized in that the support arms (17) on vertical frame legs (16) extending parallel to one another are articulated.

17. The apparatus according to claim 16, characterized in that the frame arms (16) supporting the support arms (17) are connected to one another by transverse struts (20).

18. Device according to one of claims 1 to 17, characterized in that a receptacle for the lifting tower (6) or its guide carriage is provided on the outer vertical frame legs (16).

19. The apparatus according to claim 18, characterized in that the guide carriage comprises guide rollers.

20. Device according to one of claims 1 to 19, characterized in that on the lifting tower (6) below the support device (5) and above the working platform (7) an additional platform (21) for work in the region of the cantilever (22) the bridge (1) is attached.

21. The apparatus according to claim 20, characterized in that the additional platform (21) can be extended to adapt to the structural conditions of the bridge (1).

22. Device according to one of claims 1 to 21, characterized in that the lifting tower (6) comprises an internal access (23) to the lower part of the lifting tower (24).

23. The device according to one of claims 1 to 22, characterized in that the working platform (7) is articulated to the lower part of the lifting tower (24) via a swivel head (25) provided at the lower end of the lifting tower (6).

24. The device according to claim 23, characterized in that on the Ar¬ beitsbühne (7) opposite side of the turntable (25) is provided as a counterweight, optionally serving as a machine room (26).

25. The device according to claim 24, characterized in that in the machine room (26) electrical, hydraulic and optionally pneumatic Energiever¬ supplies (27) are provided.

26. The apparatus according to claim 24 or 25, characterized in that in the machine room (27) installations (28) of elevator winches for a pillar trip including the cable winder are accommodated.

27. The device according to one of claims 1 to 26, characterized in that below the work platform (7) along the work platform (7) movable pillar access device (29) is provided.

28. The apparatus according to claim 27, characterized in that for receiving the pillar access device (2) beneath the work platform (7) is provided a rail which extends from the slewing ring (25) or machine room (26) to the free end of the work platform (7) extends.

29. The device according to claim 27 or 28, characterized in that the working platform (7) in the bottom thereof has at least two access flaps (30) for climbing the pillar access device (29).

30. The device according to claim 29, characterized in that one of the access flaps (30) is provided in the region of the lifting tower (6).

31. The device according to one of claims 27 to 30, characterized in that the pillar access device (29) comprises a base platform (31) and at least one laterally attached additional platform.

32. Apparatus according to claim 31, characterized in that an additional platform is provided on both sides of the base platform (31), so that there is a T-shaped structure.

33. Apparatus according to claim 31 or 32, characterized in that the base platform (31) is operatively connected via a suspension (32) engaging at both ends with the work platform (7) or the rail arranged under the work platform (7).

34. Device according to one of claims 31 to 33, characterized in that the pillar access device (29) or the base platform (31) and / or the work platform (7) are preferably assigned two suspension platforms (33) arranged on both sides.