EP0865539B1 - Bridge inspection system - Google Patents

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

The invention relates to a device for bridge inspection, in particular for Driving on the underside of bridges with one that can be moved in the longitudinal direction of the bridge Chassis, one placed on the chassis, for gripping one Bridge railing, a soundproofing wall or the like serving frame, one the frame can be pivoted and rotated, and can be attached to the bridge Support device and one that can be hung in or on the chassis or in the frame Lift tower with an adjoining working platform.

Devices of the type in question have been out of the market for quite some time Known practice. Documentation of the relevant is only an example State of the art referred to DE 31 24 183 A1.

The previously known devices for bridge inspection include as essential components a narrow-track chassis, which for prevention a lateral inclination of the device via attachable to the structure or the bridge Props. A walkable boom is around a vertical axis rotatably mounted so that on the one hand support arms and on the other hand a working platform are pivotable under the bridge.

The device known from practice or from DE 31 24 183 A1 Bridge inspection is problematic in use to the extent that the chassis over rigid frame parts with the boom or a boom supporting mast is connected. In this respect, the use of those in question here Device limited to the extent that the height of the frame is the height of the passable Obstacles, for example bridge railings or noise barriers. Should the known device for bridge inspection can be used universally, must the frame of the known device sufficiently high vertical frame legs include. If the bridge railing is extremely low, such high ones ensure Frame legs for insufficient and therefore unnecessarily reduced stability. An adaptation to the structural conditions of the bridge is possible with the known device in any case not possible.

The present invention is therefore based on the object of a device for To design bridge inspection of the type mentioned in the beginning and to further develop that use on bridges with railings of different heights, Soundproof walls or the like on the basis of a safe and simple construction with sufficient stability is possible.

The device according to the invention achieves the aforementioned object by Features of claim 1.

According to the invention it has been recognized that an optimal adaptation of the device the structural conditions of a bridge, in particular those provided there Railings, soundproof walls or the like., Is possible if the from Chassis-supported frames at least in the outer area, i.e. in the for Inclusion of the lifting tower serving area, is adjustable in height. With one constructive design can be the bridge railing or Adapt the cross-section of the device of the device to the soundproof wall, see above that the overall height of the frame can be adjusted to reach over of the chassis or the noise barrier is just required. A unnecessary overall height of the frame and the acceptance of a resulting this results in reduced stability or even instability of the frame effectively avoided.

From the point of view of universal use, the chassis comprises the Device according to the invention advantageously a single-track chassis, which is preferably at the outer end of a walkway on the bridge can. This is an area that has the highest possible load of the sidewalk on the bridge. The single-track design of the In any case, the undercarriage has the enormous advantage that it is already an extremely narrow one Lane is sufficient to move the device. The whole frame belongs to the chassis, but is discussed in isolation below.

For safe support or movement of the undercarriage, this points in advantageously several support wheels, pairs of support wheels or groups of support wheels on. It is essential that the chassis move in the longitudinal direction lets, the orientation of the pairs of support wheels determines the direction of travel. More specifically, the chassis can be vertically arranged, running on the floor Jockey wheels and horizontally arranged on an inner wall of the bridge or the support rail running on the bridge railing or a soundproof wall exhibit.

The frame placed on the chassis - as a link between the Chassis and the lifting tower - can at least largely in the working position have vertically extending inner and outer frame legs, the inner Frame legs the chassis and the outer frame legs of the support device or are assigned to the lifting tower. The height adjustability of the frame results in an advantageous manner in that at least the outer vertical Frame legs, but preferably also all vertical frame legs, are telescopically extendable. The actuation of the vertical frame legs takes place hydraulically or pneumatically.

For a stable design of the frame legs, in particular for implementation a stable overlap of a bridge railing or a soundproof wall, can the inner frame legs assigned to the chassis via cross struts be rigidly connected to the outer frame legs, so that the frame overall is U-shaped. According to the number of inner and outer frame legs result in several U-profiles of the frame, which in turn are connected crosswise. This connection can on the part of the inner frame leg or provided on the side of the outer frame leg be.

The problem often arises when using the device according to the invention, that any obstacles prevent the device from continuing in the built position Hinder condition or even prevent. So can be in the immediate vicinity the bridge railing, for example, lampposts or flagpoles arranged that cannot be disassembled. So that the device for Overcoming such obstacles does not need an excessively extendable one Have frames or do not have to be (partially) dismantled each time the bridge railing or the soundproof wall frame in an advantageous Be designed such that the outer - the support device associated - frame legs are firmly connected and that the inner Frame legs each via a foldable parallel arm linkage - individually and each individually - in the direction of the outer frame legs, preferably upwards, can be pivoted out of the lane or folded out. However, it would also be conceivable to remove individual frame legs shape.

Due to this design, there is now the possibility that Overcoming any obstacles in the course of advancing the device Frame legs for frame legs pivoted out of the work area the inner frame legs remaining in the lane for sufficient stability or vertical support of the device to care. Swiveling the inner frame legs out of the lane preferably takes place over the outer edge of the bridge, so that the respective frame legs given away freely move past the obstacle leaves. After overcoming the obstacle, the frame leg becomes again swung inward into the lane and can be on the lane or on support the sidewalk.

In the manner mentioned above, the frame legs are each shortly before pivoted away from the obstacle and back in after overcoming the obstacle the working position or lane swung back. The working position of the Support device or even the lifting tower with the adjacent work platform is in any case not affected. A quick overcoming The obstacles of any kind are therefore regardless of the height of the obstacles possible, because these obstacles are not caused by overlapping the obstacles on the part of the frame, but rather by swiveling individual people away Frame parts can be overcome. The overall height of the frame is therefore relevant no longer matter.

For installation on the bridge or on the outside of the bridge arm or the Bridge railing, to guide the lifting tower and finally also to benefit a safe support, the support device preferably comprises two outer vertical frame legs articulated support wheels, which point in the direction of travel run essentially horizontally. Since the outer vertical Frame legs can preferably be telescopically adjusted in length the location used to support the support wheels according to the height of the overlapping bridge railing or overlapping soundproofing wall be specified exactly. Preferably those in question here Frame legs or the support wheels carried by the outer frame legs positioned to the lowest possible area on the outside of the bridge.

To ensure a particularly high stability of the device includes the support device further comprises at least one on an outer vertical Frame legs articulated, swiveling under the bridge, from the The bottom can be supported against the bridge, at least in its working position largely horizontal support arm. Also the one supporting the support arm vertical frame leg is telescopically extendable, 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 is sufficiently far below the bridge stretches. For the actual support, the support arm comprises at least an essentially vertical or orthogonal from the support arm support extending at the top with an end rolling vertically in the direction of travel Jockey wheel. This jockey wheel is used to abut the underside of the bridge and reaches by retracting or shortening the frame leg supporting the support arm and / or by extending the support for safe attachment to the Bridge.

To further improve stability, the support arm has two to each other spaced, essentially vertical supports, each with an end Jockey wheel, with the most distant support from the lifting tower or frame leg or whose support wheel essentially absorbs the support forces. For further The supporting wheels can also be adapted to the structural conditions Supports can be extended telescopically.

In a very particularly advantageous manner and to favor a continued The safe stand of the device is the one facing the frame leg Support or its support wheel in the working position approximately under the support wheel or Arranged under the support wheels of the landing gear, provided it is the bridge construction allowed. This means that the support wheels of the undercarriage with the support wheel of the prop 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 two supports each and supported by the supports, vertically in the direction of travel Running support wheels can be provided. These support arms are parallel to each other extending, vertically arranged frame legs articulated, wherein the frame legs carrying the support arms in turn by cross struts together are connected.

For the previously discussed support device, it is essential that the entire Device exclusively over in the longitudinal direction of the bridge - vertical and horizontal - rollable support wheels supported on the bridge. The movability of the The device is thus in no way affected by the support or even with special needs. A method of the device is thus also fully effective Support device, i.e. in the working position of the entire device, possible.

As already stated at the beginning, the device comprises an in or on the Chassis or lifting tower hooked into the frame with one attached to it subsequent working platform. In concrete terms, the lifting tower can be on the outer Articulate vertical frame legs, for which there is a holder for the Lift tower or is provided for the guide carriage of the lifting tower. In advantageous The lifting tower can be attached to the outer frame legs or bring it into engagement with the guide slide there. The sledge advantageously comprises guide parts, in particular guide rollers, so that a vertical shifting of the lifting tower - with realized sliding or rolling guidance - is easily possible. The lifting tower can be in any case in the guide carriage guide vertically so that a vertical movement stroke of approx. 5 m is possible is, the vertical lowering depth being between 7 and 8 m depending on the length of the tower can.

As mentioned before, a work platform closes at the lower end of the lifting tower on. Above this work platform and below that previously discussed Support device can be an additional platform for work in the field Cantilever arms of the bridge. To adapt to the structural conditions the bridge, the additional platform is designed to be extendable. To reach on the one hand the work platform and on the other hand the additional platform includes the Elevator an internal access that extends to the lower part of the lift tower extends. The individual areas of the lifting tower or the working platforms are thus accessible from within the lifting tower.

The work platform can be swiveled under the bridge to set up the device. The work platform is provided for this purpose at the lower end of the lifting tower The slewing ring is pivoted or pivoted to the lower part of the lift tower. The lifting tower itself can be moved vertically, so that every area or each Accessible under the bridge with the working platform or the additional platform is.

On the side of the slewing ring opposite the work platform is in further advantageously formed a machine room in which electrical, hydraulic and possibly pneumatic power supplies and control devices are provided are. Installations of elevator winches can also be installed in the machine room for a pillar trip, including the necessary cable winder. It is also essential for the work space that this in particular also serves as a counterweight for long working platforms. At Short work platforms are such a counterweight in the form of a machine room not necessarily required.

A pillar access device is arranged below the work platform, which runs along the work platform is movable. To accommodate the pillar access device A rail is provided below the work platform, extending from the slewing ring or machine room extends to the free end of the work platform. So far The machine room is of further importance as a counterweight, because that Pillar access device when the end of the working platform facing the bridge is reached contributes to an increased overturning moment.

As mentioned before, the lift tower is accessible or serves as a step to the work platform. The working platform itself is similar to the lifting tower, is therefore also accessible. To exit the work platform in a pillar access device arranged underneath is provided. The work platform points at least two access flaps in the floor for climbing onto the pillar access device on. One of the access hatches 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 on the side attached additional platform. It is also possible on both sides of the base platform to provide an additional platform, so that there is a total of a T-shaped Structure results. The base platform can have a length of approx. 3.5 m and is attached to the work platform or the rail arranged under the work platform is operatively connected. Furthermore can the pillar access device or its base platform and / or the work platform be assigned a mounting platform. Again, for the sake of one Even weight distribution of particular advantage, on both sides to provide arranged mounting platforms. The additional mounting platforms provided allow inspection of the bridge pier in any case on the face to the middle.

Fig. 1

in einer schematischen Seitenansicht eine erfindungsgemäße Vorrichtung zur Brückeninspektion im Betriebszustand,

Fig. 2

in einer schematischen Seitenansicht den Gegenstand aus Fig. 1 bei weiter abgesenktem Hubturm und mit einer der Arbeitsbühne zugeordneten Einhängeplattform,

Fig. 3

in einer schematischen Vorderansicht ein erstes Ausführungsbeispiel des die Stützeinrichtung tragenden Rahmens des Gegenstandes aus Fig. 1,

Fig. 4

den Gegenstand aus Fig. 3 in einer schematischen Seitenansicht,

Fig. 5

in einer schematischen Vorderansicht die erfindungsgemäße Vorrichtung im aufgebauten Zustand, wobei der Rahmen besondere Maßnahmen zum Umfahren von Hindernissen aufweist,

Fig. 6

in einer schematischen Seitenansicht den Gegenstand aus Fig. 5,

Fig. 7

den Rahmen des Gegenstands aus den Fig. 5 und 6 in einer vergrößerten Vorderansicht,

Fig. 8

in einer schematischen Seitenansicht den Gegenstand aus Fig. 7 und

Fig. 9 bis 20

in schematischen Darstellungen die einzelnen Schritte des Aufbaus einer erfindungsgemäßen Vorrichtung an einer Brücke.

There are now various possibilities for advantageously designing and developing the teaching of the present invention. For this purpose, on the one hand, reference is made 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 conjunction with the explanation of the preferred exemplary embodiment of the invention with reference to the drawing, generally preferred configurations and developments of the teaching and the structure of the device according to the invention are also explained. In the drawing shows

Fig. 1

a schematic side view of an inventive device for bridge inspection in the operating state,

Fig. 2

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

Fig. 3

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

Fig. 4

3 in a schematic side view,

Fig. 5

in a schematic front view the device according to the invention in the assembled state, the frame having special measures for avoiding obstacles,

Fig. 6

5 shows the object from FIG. 5 in a schematic side view,

Fig. 7

5 and 6 in an enlarged front view,

Fig. 8

in a schematic side view the object of Fig. 7 and

9 to 20

the individual steps of the construction of a device according to the invention on a bridge in schematic representations.

1 and 2 each show a schematic side view of an invention Device for bridge inspection in the assembled state, i.e. in the operating state. This device is used to drive on the bottom of a Figures only schematically indicated bridge 1 and has a in Movable chassis 2 on the longitudinal direction of the bridge. Belongs to the chassis 2 an attached frame 3, which serves to reach over a bridge railing 4. Furthermore, the device comprises a pivotable and rotatable on the frame 3 Articulated support device 5 which can be placed on the bridge 1 and one in or on the chassis 2 or in the frame 3 attachable lifting tower 6. To the lifting tower 6 is followed by a work platform 7 in the lower area.

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

The chassis 2 of the embodiment of an embodiment of the invention selected in the figures Device comprises a single-track undercarriage 8, this Chassis 8 several support wheels 9 that roll vertically and horizontally in the direction of travel includes. Alternative configurations can be seen in particular in FIGS. 3 to 8 remove, the frame 3 individual support wheels 9, pairs of support wheels or Groups of support wheels can be assigned, which - individually or in groups arranged - all form a common lane.

Figures 3 to 8 show particularly clearly that the frame 3 extending vertically 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. In Figures 1, 2 and in Figures 3 to 8 is indicated that the vertical frame legs 10, 11 telescopically are extendable, the actuation of the frame legs 10, 11 and the telescopically interlocking elements hydraulically.

The inner frame legs 10 are in that shown in Figures 1 to 4 Embodiment via cross struts 12 rigid with the outer frame legs 11 connected so that the frame 3 is U-shaped overall.

In the further exemplary embodiments shown in FIGS. 5 to 8, the outer frame leg 11 firmly connected. The inner frame legs 10 are each via a foldable parallel arm linkage 13 - individually - in Direction of the outer frame legs 11, preferably upwards, from the Lane can be swung out or folded out, so that by swiveling away an inner frame leg 10 an obstacle can be avoided. After overcoming the obstacle, the inner frame leg 10 is again spent in its working position so that the next frame leg 10 folded away or can be swung away. Removing individual frame legs 10 from the lane would also be conceivable. In any case, it is essential that to overcome the obstacle the frame 3 is not a total Raised, but rather individual inner frame legs 10 from the lane to be spent. The entire device remains in the working position.

In Figures 1 to 8 is further indicated that the support device 5 two 14 hinged to outer vertical frame legs, for abutment or guidance on the outside of the bridge 1 serving support wheels 15 comprises. These training wheels 15 are arranged or mounted such that they are in the direction of travel of the device Roll along the bridge 1 sideways - at least largely horizontally.

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

Figures 1 and 2 and 4, 6 and 8 show that the Frame legs 11 or 14 and 16 facing supports 18 or their Jockey wheels 19 in the working position approximately under the jockey wheels 9 of the chassis 8 are arranged. This measure ensures optimal support Given connection with the support wheels 15 facing the bridge. The one Lift 6 facing supports 18 with support wheels also provided there 19 are used only to increase operational safety, but take supportive Forces only to a minor extent.

Fig. 3 further shows that the frame arms supporting the support arms 17 16 are connected to one another by cross struts 20. A certain one This increases the stability.

1 and 2 and in Fig. 6 it is indicated that on the outer vertical Frame legs 11 and 16, a not shown for the Lift tower 6 or its guide carriage is provided. To avoid Repetitions are referred to the general part of the description.

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

The lifting tower 6 comprises an internal access 23 to the lower part of the lifting tower 24, so that the work platform 7 is accessible from there. The working platform 7 is again via a turntable provided at the lower end of the lifting tower 6 25 articulated to the lower part 24 of the lifting tower. On the platform 7 opposite On the side of the turntable 25, a machine room 26 is formed which also serves as a counterweight for the work platform 7. Within the Machine room 26 are electrical, hydraulic and pneumatic Energy supplies 27 on the one hand and installations 28 of elevator winches for a pillar inspection including the cable winder on the other hand.

1 and 2 can also be seen that below the work platform 7th a pillar access device 29 movable along the work platform 7 is provided. To accommodate the pillar access device 29 below the work platform 7 is one in rail not shown in the figures is provided, which extends from the slewing ring 25 or Machine room 26 extends to the free end of the work platform 7. The working platform 7 in turn has two access flaps 30 for climbing the pillar access device 29 on. One of the access flaps 30 is in the area of the lifting tower 6 provided, so that from there for static reasons under the Lift tower 6 parked pillar access device 29 is accessible. With regard to a concrete Design of the pillar access device 29 is also based on the general Part of the description referenced.

Can on both sides of the base platform 31 of the pillar access device 29 Additional platforms can be provided so that there is a total of a T-shaped structure results. For the sake of clarity, an appropriate representation has been made omitted in the figures.

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

Finally, it is indicated in Fig. 2 that the work platform 7 is a suspension platform 33 is assigned, via which a more extensive inspection of the underside of the bridge or the bridge pier is possible. For reasons of symmetry or In order to distribute the weight evenly, there are two suspension platforms 33 provided, of which only the one for clarity is shown.

9 to 20 show the individual steps for the construction of the invention Contraption. The following:

As shown in Figures 9 and 10, the entire device is on the trailer 34 of a truck 35 loaded. To build the device is in crane not shown in the figures required. The trailer 34 becomes a body placed on bridge 1 and the vertical position is checked. The crane hanger 36 is attached to the eyes of the chassis 8, so that the chassis 2 with the chassis 8, frame 3 and support device 5 are lifted from the trailer 34 can (Fig. 11). Thanks to the telescopically retracted frame legs of the This frame or the chassis has an acceptable transport height.

Figures 12 to 15 show the placement and construction of the trailer 34 lifted assembly, with the chassis 2 on the edge of the bridge is put on. 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 articulated support arms 17 telescopically extended downwards (Fig. 13) and pivoted through 90 ° under bridge 1 (Fig. 14). The hydraulics are through a smaller emergency unit is supplied.

As shown in Fig. 15, the outer vertical frame legs 16 retracted telescopically until the support wheels 19 of the supports 18 with Apply 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, it can Crane hangers 36 can be unhooked again.

In a next step, the lifting tower 6 is now on the trailer 34 with the help of the crane moved into its vertical position by 90 ° (see FIG. 16). In vertical The tower 6 is then locked in position and the transport locks can can be solved (Fig. 17). Then the lifting tower 6 is together with the working platform 7 lifted from the crane. The work platform 7 is raised with the lifting tower 6 pivoted over the pillar access device 29 and the suspension 32 is on the Work platform 7 suspended (Fig. 18). Additional platforms are also on the Pillar access device 29 or mounted on its base platform 31, so that for the pillar device 29 results in a T-shape in plan view.

Finally, the entire unit, i.e. 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 lifted from below the bridge and in the outer frame legs 11 or in a guide provided there mounted. When suspended, the work platform 7 can be used together with the pillar access device 29 and the additional platforms under the bridge 1 move or swivel (20). Finally, the hydraulics - if necessary Pneumatics and electrical lines - connected. The diesel engine is started and a functional check can take place. The device according to the invention is ready for use.

In conclusion, it should be particularly pointed out that this is mentioned above discussed embodiment of an inventive device for Bridge inspection chosen arbitrarily to discuss the claimed teaching has been. However, the teaching claimed is chosen arbitrarily Embodiment not limited to this.

Claims (13)

1. Bridge inspection system, specifically for moving along the underside of bridges (1), with 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), characterised in that the frame (3) at least in the outer section closest to the lifting tower is height-adjustable.
2. System according to claim 1, characterised in that the chassis (2) comprises a single track undercarriage (8), said undercarriage (8) comprising several support wheels (9), support wheel pairs or groups of support wheels that are vertical and if necessary horizontal in a position of use.
3. System according to claim 1 or 2, characterised in that the frame (3) comprises inner and outer frame links (10, 11) that run at least largely vertically in the position of use, wherein the inner frame links (10) are assigned to the undercarriage (8) and the outer frame links (11) to the support device (5), wherein the vertical frame links (10, 11) are telescopically extendable and may be operated hydraulically or pneumatically.
4. System according to claim 3, characterised in that the inner frame links (10) are connected by transverse struts (12) rigidly to the outer frame links (11), so that the frame (3) as a whole is designed to be U-shaped, or in that the outer frame links (11) are firmly joined together, and in that the inner frame links (10) respectively can - singly - be pivoted out or folded out of the drive track preferably upwards by a foldable parallel arm rod (13) in the direction of the outer frame link (11).
5. System according to one of claims 1 to 4, characterised in that the support device (5) preferably comprises two horizontal support wheels (16) hinged onto outer frame links (14) that are vertical in a position of use, for mounting on the outside of the bridge (1)
6. System according to one of claims 1 to 5, characterised in that the support device (5) comprises at least one support arm (17) that is hinged onto an outer frame link (16) vertical in the position of use, which support arm is pivotable under the bridge (1), supportable from underneath against the bridge (1) and is at least mainly horizontal in it working position, wherein the support arm (17) is preferably extendable telescopically and if necessary has at least one essentially vertical support (18) with a vertical running end support wheel (19) or two spaced apart essentially vertical supports (18) each with a vertically running end support wheel (19).
7. System according to claim 6, characterised in that the support (18) or its support wheel (19) facing the frame link (16) is arranged in the working position approximately below the support wheel (9) of the undercarriage (8), wherein the support device (5) if necessary comprises two preferably parallel arranged support arms (17) and the support arms (17) are preferably hinged onto parallel running vertical frame links (16), wherein the frame links (16) bearing the support arms (17) are joined together by transverse struts (20).
8. System according to one of claims 1 to 7, characterised in that on the outer frame links (16) that are vertical in a position of use a mount for the lifting tower (6) or its guide carriage is provided, wherein the guide carriage comprises guide rollers.
9. System according to one of claims 1 to 8, characterised in that on the lifting tower (6) underneath the support device (5) and above the working platform (7) an additional platform (21) for work in the region of the jib (22) of the bridge (1) is arranged, wherein the additional platform (21) can be extended to fit the structural requirements of the bridge (1).
10. System according to one of claims 1 to 9, characterised in that the lifting tower (6) has an intemal access (23) to the lifting tower lower part (24) and in that the working platform (7) if necessary is hinged to the lifting tower lower part (24) by a slewing ring (25) provided at the bottom end of the lifting tower (6), wherein on the side of the slewing ring (25) opposite the working platform (7) a machine room (26) acting as a counterweight is provided, and wherein in the machine room (26) electrical, hydraulic and if necessary pneumatic energy supplies (27) are provided.
11. System according to one of claims 1 to 10, characterised in that underneath the working platform (7) a travelling pier device (29) movable along the working platform (7) is provided, and in that for mounting the travelling pier device (29) underneath the working platform (7) a rail is provided, which extends from the slewing ring (25) or the machine room (26) up to the free end of the working platform (7), wherein the working platform (7) in its base has at least two access flaps (30) for stepping onto the travelling pier device (29), and wherein of necessary one of the access flaps (30) is provided in the region of the lifting tower (6).
12. System according to claim 11, characterised in that the travelling pier device (29) has a main platform (31) and at least one laterally attached additional platform, and in that on both sides of the main platform (31) an additional platform is provided forming a T-shaped structure, wherein the main platform (31) is connected by a suspension (32) gripping at both ends to the working platform (7) or the rail arranged under the working platform (7).
13. System according to claim 12, characterised in that to the travelling pier device (29) or the main platform (31) and/or the working platform (7) preferably two suspension platforms (33) arranged on both sides are assigned.

Images