EP2287070A2 - Heavy load loading system - Google Patents

Abstract

The heavy duty loading system (10) has two mutually parallel crane runway girder along which a lifting machine (22) is movable. The lifting machine is equipped with a traveling trolley (18). The crane runway girder is mounted on a support structure (12) at the land side, and is mounted on another support structure (14) at the ship side. An independent claim is also included for a method for loading or unloading of ships.

Description

The present invention relates to a heavy load loading system and a method for loading and / or unloading of ships.

For loading and unloading of ships often portal cranes are used, which have a cantilevered crane runway carrier, which extends beyond the ship to be loaded in order to lower the goods to be loaded on the ship or lift from there. Although relatively large loads can be moved with such gantry cranes, the maximum load of these gantry cranes is nevertheless limited, inter alia, by the Kragarmlänge the cantilevered crane runway girder.

In addition, the maximum load of known ship cranes is also limited by the fact that they derive both their own weight and that of the goods to be moved into the ground on which they are built. Thus, the bearing capacity of the subsurface and in particular the Grundbruchwiderstand significantly affects the maximum load of known ship cranes, with the result that extremely heavy loads such as transformers, presses or power turbine turbines are not moved with conventional ship cranes or only with the help of auxiliary measures such as additional cranes can.

The invention is therefore based on the object of a heavy load loading system and a method for loading and / or unloading of ships to move even extremely heavy loads such as transformers, presses or power plant turbines.

This object is achieved according to one aspect of the present invention with a heavy duty loading system for loading and / or unloading ships, having the features of claim 1.

The heavy-duty loading system according to the invention has at least one crane runway girder along which a lifting trolley can be moved beyond the ship to be loaded and / or unloaded, the at least one gantry girder on a first support structure on the shore side and on a second support structure on the ship side, which is located on the loading and / or unloading ship is stored.

According to the invention, it is thus proposed for the first time to provide a second support for the usually cantilevered crane runway girder, which is located on the ship to be loaded and / or unloaded and thus supports or supports the usually freely projecting end of the gantry support. The weight of the crane runway girder itself as well as the weight of the goods to be moved is thus proportionately derived via the shore-side support structure into the ground and the ship-side support structure in the ship, whereby the Grundbruchgefahr the substrate on which the first land-side support structure is reduced. In addition, the maximum bending moment occurring in the crane runway carrier as well as the maximum occurring transverse force are reduced by the bearing of the crane runway girder on the ship-side support structure, so that significantly heavier loads can be moved with essentially the same sized crane runway girders.

In order to be able to move the trolley up to about the loading and / or unloading ship to unload or pick up goods there, the ship-side support structure is designed such that with the heavy load loading system to be loaded goods hanging on the hoist up in the inner region of the support structures are conveyed. For this purpose, the ship-side support structure, for example, have a U-shaped plan, as this can ensure that goods to be loaded on the hoist hanging through the opening of the "U" can be transported into the inner region of the support structures.

Preferred embodiments of the heavy duty loading system according to the invention will become apparent from the description, the drawings and the dependent system claims.

In order to be able to move particularly heavy loads, the heavy-duty loading system according to the invention may comprise two mutually parallel crane runway girders, both of which are mounted on the land side on the first support structure and on the ship side on the second support structure. The weight of the loads to be moved is thus, before it is introduced into the two support structures, split on two crane runway beams, so that each of the two crane runway again undergoes less bending moment and shear force, which means inversely an increase in the maximum load. In addition, the fact that two crane runway carriers are used also reduces the bearing forces of the respective crane runway carrier on the supporting structures and thus also the internal forces that are decisive for dimensioning the supports and the intersections between the crane runway girder and the supporting structure individual crane runway beams but also the respective supports can be dimensioned smaller.

In order that the weight of the loads to be moved is divided as evenly as possible on the two crane runway carriers, the heavy load loading system according to the invention can comprise at least one, preferably two, cat carriers which can be moved together along the crane runway carriers, which span the distance between the two crane runway carriers.

According to a further embodiment, at least one, preferably two hoists may be provided on each of the cat carriers, which may be, for example, cable or chain hoists or rope or chain winches. However, it proves to be particularly advantageous if so-called strand jacks are used as hoists, since loads of several 100 t can be lifted with such strand jacks, so that the hoist has no relevant influence on the maximum load capacity of the heavy-load loading system.

Although the heavy-duty loading system according to the invention is suitable for moving extremely heavy loads, the draft of the ship loading and / or unloading with the heavy-duty loading system according to the invention will generally not change or will only change slightly, since the buoyancy of the ship is generally high will be many times greater than the loads to be moved. The respective ship can thus be regarded as a kind of infinite rigid support to which the ship-side support structure releases its loads.

In the case, however, that the draft of the ship should nevertheless change during the loading and / or unloading, which, for example, in smaller Ships or when loading with a variety of extremely heavy goods may be the case, it is provided according to a further embodiment, that the first support structure and / or the second support structure to compensate for load-induced inclination changes of the crane runway carrier are adjustable in height, including the first support structure and / or the second support structure can have telescopic, preferably hydraulically telescopic supports. If, in fact, the draft of the ship to be loaded should change during the loading process, this draft change has an effect on the inclination of the crane runway girder as a result of the bearing of the crane runway girder via the second ship-side support structure. However, since such changes in inclination are generally undesirable, since they can lead to extremely high forced voltages in the crane runway girder, for example, in the event that the draft of the ship should increase to a certain extent, the support height of the second, ship-side support structure can be increased by the same amount around which the draft increases, so that the crane runway carrier does not experience any change in inclination.

However, since the changes in inclination of the crane runway girder (s) with the naked eye are barely discernible, and even slightest changes in inclination can cause extremely high forced stresses in the gantry crane (s), it is provided according to a further embodiment that in the area at least one Crane rail carrier a sensor, z. As a dragonfly or a digital spirit level, is provided which measures the inclination of the respective crane runway girder. By continuously monitoring the measurement result of the dragonfly or the digital spirit level, a decision can therefore be made as to whether and which of the two support structures is to be adjusted in height.

Although this height or inclination adjustment can be made manually by an operator continuously monitors the measurement result of Libelle or digital spirit level and optionally actively makes a height adjustment of the respective support structure, according to a further embodiment, this adjustment can also be done automatically. For this purpose, the heavy-duty loading system according to the invention may comprise a control device according to another embodiment, which continuously changes the height of the first support structure and / or the second support structure, evaluating the Kranbahnträgerneigung. The control device evaluates, for example, the measurement results generated by the digital spirit level and generates corresponding control signals, by which an actuator for adjusting the height of the respective support structure can be made to make the desired height adjustment.

According to a further embodiment, the second or the ship-side support structure may include at least two stackable modules, wherein the upper module is preferably releasably connected to the at least one crane runway girder. This embodiment may prove to be advantageous in particular when different and in particular different sized ships are to be loaded with the heavy-duty loading system according to the invention since, depending on the size of the ship and the structure, different levels of support structures on the ship are required. However, instead of creating differently high ship-side support structures on each ship to be loaded with the heavy-load loading system of the present invention, the present embodiment allows the ship-side support structure to comprise at least two stackable modules, only the lower module, in different high embodiments must be maintained in order to bridge the height difference to the lower edge of the upper module. The ship-side support structure in at least two stackable modules to subdivide, thus turns out to be advantageous that, for example, the lower module can be an integral part of the ship, so that this lower module are effectively regarded as an adapter for coupling to the heavy-load loading system according to the invention can.

As already explained above, even slight deformations of the crane runway girder (s) can cause extremely high forced stresses in the affected crane runway girder. Accordingly, the respective crane runway carrier only a single support point on the shore-side support structure in order to prevent unwanted forced voltages are introduced into the respective crane runway carrier, which can be caused by a multiple storage. The respective crane runway girder can thus slightly deflect due to the load, without any forced-cut sizes occurring, as may be the case with statically overdetermined systems.

According to a particularly preferred embodiment, it can further be provided that the support, on which the at least one crane runway support is mounted on the first support structure, is a monovalent bearing displaceable in the longitudinal direction of the at least one crane runway support. In this way, not only temperature-induced Normakraftspannungen but also such normal force voltages can be prevented, which would otherwise be initiated by lateral movements of the vessel to be loaded in the crane runway carrier.

In order to load the ship-side support structure even with minor rolling movements of the ship always evenly, it is according to another provided preferred embodiment that each crane runway carrier is mounted on two supports on the second support structure and preferably releasably connected thereto, wherein a load balancing device, preferably a hydraulic coupling is provided which automatically performs load balancing between the supports on which the respective crane runway carrier on the second support structure is stored.

Thus, for example, a slight rolling movement of the ship would normally lead to relieving the one bearing and additionally burdening the other abutment. Such an uneven Auflagerbelastung can be counteracted by a hydraulic coupling of the individual supports, as this ensures that each support is always charged equally. This can for example be achieved in that each support comprises a piston-cylinder unit, which are in fluid communication with each other, whereby load-induced deformations of the one bearing can be converted into corresponding opposite deformations of the other bearing, which corresponds to a load balance between the respective camps.

According to a further aspect of the present invention, the object underlying the invention is also achieved with a method for loading and / or unloading ships, which has the features of claim 13. For the sake of completeness, it should be noted at this point that all the features of the heavy duty loading system according to the invention can be implemented in the method according to the invention, since this preferably operates using the heavy load loading system according to the invention.

The inventive method for loading and / or unloading of ships runs so that first a land-side support structure and a ship-side support structure, which is located on the loading and / or unloading ship, are created on which then stored at least one crane runway becomes. Subsequently, goods to be loaded are then loaded using a trolley having a hoist, which is movable along the at least one crane runway carrier.

Preferred embodiments of the method according to the invention for loading and / or unloading ships result from the description, the drawings and the dependent method claims.

In order to avoid the emergence of deformation-induced positive stresses in the crane runway during the loading process, it is provided according to a preferred embodiment of the method according to the invention during the loading process to continuously monitor the crane runway inclination, wherein in case that the crane runway slope should exceed or fall below a predetermined threshold, the crane track carrier inclination is actively changed by preferably changing the height of the ship-side support structure and / or the shore-side support structure. This can be done, for example, that an operator continuously crane runner inclination using a sensor attached thereto, for. As a dragonfly or digital spirit level, monitored. If the operator determines that the crane runway inclination exceeds or falls below a predetermined threshold value, the operator can activate an actuation actuator, such as a hydraulic pump, to hydraulically telescope in or out the supports of the affected support structure, for example in the area of the supports Piston-cylinder units are to be arranged.

Fig. 1

eine Aufrissdarstellung des erfindungsgemäßen Schwerlast- Verladesystems zeigt;

Fig. 2

eine Draufsicht auf das erfindungsgemäße Schwerlast- Verladesystems der Fig. 1 zeigt;

Fig. 3

den Schnitt A - A der Fig. 1 zeigt;

Fig. 4

den Schnitt B - B der Fig. 1 zeigt;

Fig. 5

den Schnitt C - C der Fig. 1 zeigt;

Fig. 6

den Schnitt F - F der Fig. 1 zeigt;

Fig. 7

den Schnitt H - H der Fig. 1 zeigt;

Fig. 8

den Schnitt G - G der Fig. 1 zeigt;

Fig. 9

den Schnitt E - E der Fig. 1 zeigt;

Fig.

10 den Schnitt D - D der Fig. 1 zeigt; und

Fig. 11

den Schnitt I - I der Fig. 1 zeigt.

In the following, the heavy-duty loading system and method according to the invention will be described purely by way of example with reference to an exemplary embodiment with reference to the accompanying drawings, in which:

Fig. 1

an elevation view of the heavy duty loading system according to the invention;

Fig. 2

a plan view of the heavy-load loading system of the invention Fig. 1 shows;

Fig. 3

the section A - A of Fig. 1 shows;

Fig. 4

the section B - B of the Fig. 1 shows;

Fig. 5

the section C - C of the Fig. 1 shows;

Fig. 6

the section F - F of Fig. 1 shows;

Fig. 7

the section H - H the Fig. 1 shows;

Fig. 8

the section G - G of the Fig. 1 shows;

Fig. 9

the cut E - E the Fig. 1 shows;

FIG.

10 the section D - D the Fig. 1 shows; and

Fig. 11

the section I - I the Fig. 1 shows.

The Fig. 1 shows a heavy-load loading system 10 according to the invention in a side view. The heavy duty loading system 10 is adapted to load a ship S floating in a body of water G with extremely heavy goods such as transformers, presses or power plant turbines or to clear the ship S. In the illustrated embodiment, the heavy-load loading system 10 has two mutually parallel crane runway girders 16a, 16b, which may, for example, be I-girders of the IPE, HEAA, HEA, HEB or HEM series. In order to reduce the risk of bending bends, however, the crane runway girders 16a, 16b are preferably designed as closed hollow-profile boxes with a height dimension of the order of 150 cm to 250 cm, as shown in FIG Fig. 6 to 11 can be removed.

The heavy duty loading system 10 according to the invention further comprises a first land-side support structure 12, which may for example be erected on the subsurface U of a harbor, and a second ship-side support structure 14 which extends into the hull of the ship S and stands up there. The two crane runway girders 16a, 16b are mounted on the first support structure 12 on the shore and on the second support structure 14 on the ship.

If the shore-side support structure 12 and the ship-side support structure 14 globally considered as a single support for the two crane runway girder 16a, 16b considered, each of the two crane runway girder 16a, 16b thus the static system of a single-frame carrier is based, in which both the maximum bending moment and the maximum occurring lateral force is smaller than in a cantilevered crane runway girder. Conversely, this means that in the same size crane rail girders with the heavy-load loading system according to the invention 10 significantly heavier loads can be lifted and moved, as with a gantry crane with the same size, freely projecting crane girder carriers.

How best of all Fig. 2 can be removed, extend between the two parallel crane runway girders 16a, 16b two trolley 18 forming Katzträger 20a, 20b, which are not shown in detail on sliding or rolling means on the upper flange of the two crane runway girder 16a, 16b in the longitudinal direction of the same. Although in the illustrated embodiment, two parallel cat carriers 20a, 20b are shown, the trolley 18 may also be formed by more or less than two cat carriers.

In the illustrated embodiment, the trolley 18 has a total of four synchronously operable hoists 22, which may preferably be stranded jacks, as can be lifted with such strand jacks loads of several 100 t, so that hoist 22 has no relevant influence on the maximum load capacity of the heavy load loading system 10 has.

The two support structures 12, 14 are spatial frames with rigid and preferably concave frame corners (see, for example, FIG. Fig. 7 . Fig. 1 ), whereby not only the spatial rigidity of the support structures 12, 14 but also the maximum occurring internal internal forces, which are caused by the corner moments, can be kept small. The support structures 12, 14 are thus each formed by three frames, which are arranged and oriented relative to each other so that they form a U-shape in plan view, as for example the 3 and 4 can be removed. The mutually perpendicular frames are divided each with a common corner support. Due to the fact that the support structures 12, 14 have a U-shape in the plan view, it is possible to transport goods to be suspended on the trolley 18 or the hoists 22 in particular into the inner area of the ship-side support structure 14 and there to the ship S, which it is to be loaded, can be discontinued. Also, in this way, a discharge of the ship S is possible by goods that are located in the interior of the U-shape of the ship-side support structure 14 on the ship S, raised from there by means of the trolley 18 and the hoists 22 and out of the area the ship-side support structure 14 are conveyed out.

In order to further increase the spatial rigidity of the supporting structures 12, 14, both the frame panels extending in the longitudinal direction of the crane runway girders 16a, 16b and the transversely extending outer frame panels can be stiffened by bandages 24 in the form of crossing bars or ropes. In principle, only the said U-shape forming frame or their supports can be stiffened with bandages, whereas the two inner supports of the two support structures 12, 14 should not be stiffened by bandages, as this the transport of hanging on the hoists 22 Goods in the area of the land-side support structure 12 in the inner region of the ship-side support structure 14 or vice versa would be hindered.

Since smaller ships S may experience a draft change as a result of loading with very heavy goods, it is provided in the illustrated embodiment that the ship-side support structure 14 is height-adjustable, as shown in FIG Fig. 1 indicated by the arrows H. This height adjustment H can be at a draft change take advantage of the ship S to the extent that the height adjustment H, the height of the support structure 14 can be increased or decreased by the same amount by which the draft of the ship S or has decreased. In this way it can be prevented that the crane runway girders 16a, 16b experience an undesired change in inclination.

In order to realize this height adjustability H, the support structure 14 in the illustrated embodiment has telescopic, preferably hydraulically telescoping supports 26 (FIG. Fig. 1 ), so that any depth changes of the ship S can be compensated continuously or in real time by actuation of associated actuation actuators (not recognizable).

However, since neither the draft changes of the ship S nor the concomitant changes in inclination of the crane runway girders 16a, 16b can be detected with the naked eye, a dragonfly 28 and / or a digital spirit level 28 is provided in the area of the gantry girders 16a, 16b so as to reduce the inclination of the crane girder 16a, 16b continuously monitor respective crane runway girder 16a, 16b and, if appropriate, either manually or using a corresponding control device to cause the aforementioned actuator to vary the height of the supports 26 of the support structure 14.

Since different ships, which are to be loaded with the heavy-load loading system 10 according to the invention, may also have different depths, it is further provided in the illustrated embodiment that the ship-side support structure 14 consists of at least two stackable U-shaped frame modules 14.1, 14.2, wherein the upper frame module 14.2 with each the two crane runway girders 16a, 16b can be detachably connected via two strap connections 30. The upper frame module 14.2 can thus be attributed to a certain extent the stationary, land-side part of the heavy load loading system 10, whereas the lower frame module 14.1 can be attributed to the ship S, which allows each ship S, be with the inventive heavy-load loading system 10 be - or to be unloaded, has its own frame module 14.1 to compensate for the height difference to the lower edge of the upper frame module 14.2 can. The lower frame module 14.1 or its supports 26 therefore do not have to have such a large telescopic lift that the height difference can thus be bridged to the lower edge of the crane runway girders 16a, 16b.

In order to evenly load the ship-side support structure 14 with loads from the crane runway girders 16a, 16b even with slight rolling movements of the ship S, the two support points 30 on which each of the crane runway girders 16a, 16b rests on the support structure 14 are provided by a load balancing device such as a hydraulic coupling K interconnected so as to ensure a load balance between the support points 30. In this way it can be ensured that the support structure 14 is always uniformly loaded, whereby the risk of buckling individual supports is reduced by any overload.

In contrast to the ship-side support structure 14, the two crane runway girders 16a, 16b are mounted on the landside support structure 12 only at a single support point 32 in the form of a monovalent support, which permits longitudinal movement of the crane run girders 16a, 16b with respect to the shore support structure 12. This is made possible by the fact that the two crane runway girders 16a, 16b in one Art quiver 34 are guided, which flank both the crane runway girders 16a, 16b and the parallel extending latch 36 of the support structure 12 (s. Fig. 8 ). In this way, not only temperature-induced normal force voltages but also such normal force voltages in the two crane runway girders 16a, 16b can be prevented, which otherwise would result from lateral movements of the ship S to be loaded.

In the following, the steps required for setting up and operating the heavy-duty loading system according to the invention will now be explained:

After the shore-side support structure 12 already explained in detail above has been erected on the harbor underground U and a ship S has created adjacent to the shore-side support structure 12, an already pre-assembled lower, ship-side frame module 14.1 can subsequently be fitted into the fuselage, for example with a mobile crane (not shown) of the ship S are lifted, if the ship S does not already have such a lower frame module 14.1 itself. Subsequently, an already preassembled second or upper frame module 14.2 is placed on the lower frame module 14.1 with the mobile crane, so that then placed on the two so constructed support structures 12, 14 with the help of the mobile crane, the two crane runway girder 16a, 16b in the manner explained above or can be stored. In the event that the upper frame module 14.2 has already been connected in advance to the crane runway girders 16a, 16b via the strap connections 30, the unit consisting of gantry girders 16a, 16b and upper frame module 14.2 can also be brought into position as a whole with the aid of the mobile crane. After finally the trolley 18 with the mobile crane on the two crane runway girders 16a, 16b was discontinued, then the operation of the heavy duty loading system 10 can be recorded.

Although some time is required to build the heavy duty loading system 10 of the present invention in the manner previously described, this does not adversely affect the economics of the heavy load docking system 10, as it does when loaded with the heavy load docking system 10 a plurality of goods to be loaded, the operating time is significantly longer than the time required to build the loading system 10 so that it can be neglected.

Thus, according to the invention, a heavy load loading system is proposed for the first time, which at least partially discharges its loads to a ship to be loaded or unloaded.

LIST OF REFERENCE NUMBERS

10

Heavy loading system

12

first, shore-side support structure

14

second, ship-side support structure

14.1

lower frame module

14.2

upper frame module

16a

Crane track carrier

16b

Crane track carrier

18

trolley

20a

Katz carrier

20b

Katz carrier

22

hoists

24

associations

26

telescopic supports

28

Dragonfly or spirit level

30

splices

32

one-value bearings

34

quiver

36

bars

G

waters

U

underground

S

ship

H

Height adjustment

K

hydraulic coupling

Claims (15)

Heavy load loading system (10) for loading and / or unloading a ship (S), with at least one crane runway girder (16a, 16b) along which a hoist (22) having trolley (18) up to about to The at least one crane runway girder (16a, 16b) is mounted on the ship side on a first support structure (12) on the shore and on a second support structure (14) which is located on the ship to be loaded and / or unloaded is. Heavy load loading system according to claim 1,
characterized in that
the heavy load loading system (10) has two mutually parallel crane runway girders (16a, 16b), both of which are mounted on the land side of the first support structure (12) and on the ship side on the second support structure (14). Heavy load loading system according to claim 2,
characterized in that
the distance between the two crane runway girders (16a, 16b) is bridged by at least one, preferably two, cat girders (20a, 20b) which are movable jointly along the crane runway girders (16a, 16b). Heavy load loading system according to claim 3,
characterized in that
at least one, preferably two hoists (22) are provided on each cat carrier (20a, 20b), which are rope or chain hoists, rope or chain winches or preferably strand jacks. Heavy duty loading system according to at least one of the preceding claims,
characterized in that
the first support structure (12) and / or the second support structure (14) are designed to be height adjustable in order to compensate load-induced inclination changes of the at least one crane runway girder (16a, 16b). Heavy duty loading system according to at least one of the preceding claims,
characterized in that
the first support structure (12) and / or the second support structure (14) telescoping, preferably hydraulically telescoping supports (26). Heavy duty loading system according to at least one of the preceding claims,
characterized in that
in the region of at least one crane runway girder (16a, 16b) a sensor, for. B. a dragonfly (28) or a digital spirit level (28), is provided, which measures the inclination of the respective crane runway girder (16 a, 16 b). Heavy duty loading system according to at least one of the preceding claims,
characterized in that
a control device is provided which continuously changes the height of the first support structure (12) and / or the second support structure (14) while evaluating the crane runway inclination. Heavy duty loading system according to at least one of the preceding claims,
characterized in that
the second support structure (14) comprises at least two stackable modules (14.1, 14.2), wherein preferably the upper module (14.2) is releasably connected to the at least one crane runway girder (16a, 16b). Heavy duty loading system according to at least one of the preceding claims,
characterized in that
the support (32) on which the at least one crane runway girder (16a, 16b) is mounted on the first support structure (12) is a monovalent bearing displaceable in the longitudinal direction of the at least one gantry support (16a, 16b). Heavy duty loading system according to at least one of the preceding claims,
characterized in that
each crane runway girder (16a, 16b) is mounted on two supports (30) on the second support structure (14), wherein a load balancing device (K), preferably a hydraulic coupling (K) is provided, which automatically performs a load balance between the supports (30) on which the respective crane runway girder (16a, 16b) is mounted on the second support structure (14). Heavy duty loading system according to at least one of the preceding claims,
characterized in that
at least the ship-side support structure (14) is designed such that with the heavy-load loading system (10) goods to be loaded on the hoist (22) hanging in the inner region of the support structures (12, 14) are conveyed. Heavy duty loading system according to at least one of the preceding claims,
characterized in that
the first and / or the second support structure (12, 14) comprises two two-armed frames extending in the craneway longitudinal direction, which are preferably connected to one another in a frame-like manner via crossbeams such that goods to be loaded on the hoist can be loaded with the heavy-load loading system (10) (22) hanging in the range of support structures (12, 14) are conveyed. Method for loading and / or unloading a ship (S), in which: - For at least one crane runway girder (16a, 16b) created a shore-side support structure (12) and on the ship to be loaded and / or unloading (S) a ship-side support structure (14) is provided; - The at least one crane runway girder (16a, 16b) is mounted on the thus created support structures (12, 14); and - Loading and / or unloading ship (S) using a hoist (22) having trolley (18) along the at least one crane runway girder (16a, 16b) is moved, loaded and / or unloaded. Method according to claim 14,
characterized in that
during the loading operation, the crane runway inclination is continuously monitored, wherein in case the crane runner inclination exceeds or falls below a predetermined threshold, the crane runner inclination is changed by preferably changing the height of the ship's support structure (14) and / or the shore support structure (12) ,

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