NL2015896B1 - Mast crane and offshore vessel. - Google Patents

Mast crane and offshore vessel. Download PDF

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Publication number
NL2015896B1
NL2015896B1 NL2015896A NL2015896A NL2015896B1 NL 2015896 B1 NL2015896 B1 NL 2015896B1 NL 2015896 A NL2015896 A NL 2015896A NL 2015896 A NL2015896 A NL 2015896A NL 2015896 B1 NL2015896 B1 NL 2015896B1
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NL
Netherlands
Prior art keywords
boom
jib
column
main boom
main
Prior art date
Application number
NL2015896A
Other languages
Dutch (nl)
Inventor
Van Wingerden Mike
Roodenburg Joop
Original Assignee
Itrec Bv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Itrec Bv filed Critical Itrec Bv
Priority to NL2015896A priority Critical patent/NL2015896B1/en
Application granted granted Critical
Publication of NL2015896B1 publication Critical patent/NL2015896B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
    • B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
    • B66C23/52—Floating cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/48—Automatic control of crane drives for producing a single or repeated working cycle; Programme control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/82—Luffing gear

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Jib Cranes (AREA)

Abstract

The invention relates to a mast crane. Typically, a mast crane comprises a hollow vertical column, a boom slew bearing, a boom, a cable guide slew bearing, a top cable guide, a boom pivoting assembly and a hoist assembly. According to the invention, the mast crane is provided with a pivotable jib and with a jib pivoting assembly. The jib pivoting assembly comprises a jib winch with an associated jib tensioning member, and a jib tensioning member spacing structure comprising lever arms. The lever arms are configured to provide the jib tensioning member with leverage for pivoting the jib, i.e. to position the jib relative to the boom, even when a load is supported by the hoisting assembly. This configuration allows for a vast range of positions of the jib, using simple means such as cables and a winch.

Description

MAST CRANE AND OFFSHORE VESSEL
The invention relates to a mast crane. Typically, a mast crane comprises a hollow vertical column, a boom slew bearing, a boom, a cable guide slew bearing, a top cable guide, a boom pivoting assembly and a hoist assembly.
The column has a foot and a top, and is stationary fixed to a vessel.
The boom slew bearing is located at the foot of the column and extends around the stationary vertical column. The boom is supported by the boom slew bearing, so that the boom can rotate about the vertical stationary column. An inner end of the boom is connected pivotably about a horizontal boom pivot axis to the boom slew bearing, so that the boom can pivot up and down about the boom pivot axis;
The cable guide comprises sheaves for guiding cables into the hollow vertical column at the top end thereof. It is supported by the cable guide slew bearing, which is located at the top of the stationary vertical column, such that the cable guide can follow rotary movements of the boom about the vertical column and adopts substantially the same angular position as the boom.
The boom pivoting assembly, for pivoting the boom up and down, comprises a boom winch and an associated luffing cable. The boom winch is disposed in the vicinity of the foot of the vertical column, preferably in the column, so that the luffing cable extends from the winch through the hollow vertical column and via the top cable guide to the outer end of the boom. The boom winch allows to vary the length of the luffing cable and thus to position the boom.
The hoist assembly, for lifting and lowering a load, comprises a hoist winch and an associated hoisting cable; and a load suspension device. The hoist winch is disposed in the vicinity of the foot of the vertical column, preferably in the column, so that the hoisting cable extends from the hoisting winch through the hollow vertical column and via the top cable guide and via at last one sheave at the tip of the jib to a load suspension device. The hoist winch allows to vary the length of the hoisting cable and thus to lower and lift the load suspension device.
Mast cranes of this type have already been commercially available from the applicant for decades, in particular for installation on a vessel, such as for example a cargo vessel, a tender ship used in the offshore industry, etc. NL 192 679 has disclosed a hoisting crane of this type, in which a cable guide mechanism is provided in the interior of the hollow vertical column, ensuring that the hoisting cable follows the correct path in every angular position of the jib with respect to the column.
It is furthermore known in the prior art to provide the boom of mast cranes with a fixed extension in the form of a jib. Typically, the jib supports an auxiliary hoist, i.e. a hoist assembly configured for lifting and lowering loads comparatively small in view of the loads lifted by the hoisting assembly supported by the boom. In some cases, the extension jib is dimensioned to support the main hoist. In these cases, the jib is used as a boom extension, i.e. to provide the mast crane with an extended reach.
It is an object of the first aspect of the invention to propose an improved hoisting crane. To this end, the invention provides a hoisting crane in accordance with claim 1. According to the invention the mast crane is provided with a jib, the jib having an inner end, a mid section and a tip opposite the inner end of the jib. The inner end of the jib is connected pivotably about a horizontal jib pivot axis to the outer end of the main boom, so that the jib is pivotable between an extended position and a folded position, the mast crane furthermore comprises a jib pivoting assembly for pivoting the jib relative to the boom between its extended position and its folded position. The jib pivoting assembly comprises a jib winch and an associated jib tensioning member, and a jib tensioning member spacer structure. The spacer structure comprises at least a first, second and third lever arm for supporting the jib tensioning member at a first, second and third support point respectively, which support points are spaced in a radial direction relative to the jib pivot axis and are located at different angular positions relative to the jib, wherein the first support point is located closest to the tip. The jib winch is disposed in the vicinity of the foot of the vertical column, preferably in the column, so that the tensioning member extends from the jib winch through the hollow vertical column, via the top cable guide and over the jib tensioning member spacer structure to the tip of the jib. The jib winch allows to vary the length of the tensioning member and thus to position the jib. Furthermore, the tensioning member and the spacer structure are embodied such that, depending on the orientation of the jib, the tensioning member is engaged and supported by the first or by the first and second or by the first, second and third lever arm.
Providing the mast crane with a pivotable jib, the jib supporting the hoist of the mast crane, enhances the reach of the mast crane. In its extended positions the jib provides a reach beyond the length of the boom. While in its folded position it allows for lifting and lowering loads relatively close to the mast. With known boom extensions, the reach of the boom is simply extended, and the working area of the mast crane is moved outward. With a pivotable jib, the working area is increased, enabling the mast crane to lift loads close to the mast as well as further away from the mast.
Furthermore, the invention allows for providing a mast crane with a comparatively low mast without a diminished working area. This is beneficial since a small mast enables the vessel to pass low bridges.
Also, the pivotable jib allows for lifting large voluminous objects, such as jackets and top sides, close to the column. When the boom is pivoted upward, to enable lifting a large object, the jib can be set at an angle relative to the boom to thus position the load hoisting device at a distance from the boom, i.e. to offset the hoisting device relative to the boom, and prevent a voluminous object contacting the boom. Therefore a smaller crane can be used compared to a traditional fixed boom crane to perform similar operations.
Furthermore, with the pivotable jib in its folded position, the mast crane is provided with a low suspension point. This low suspension point reduces the free hanging length of the hoisting cable, and thus decreases the swinging motions of the load, which increases load control and safety aboard the vessel. Also, as the force of the load is introduced at a lower point of the crane, the stability of the vessel is increased. These features makes the crane safe and efficient.
According to the invention, the Mast crane is provided with a jib pivoting assembly comprising a jib winch with an associated jib tensioning member, and a jib tensioning member spacing structure. The lever arms are configured to provide the jib tensioning member with leverage for pivoting the jib, i.e. to position the jib relative to the boom, even when a load is supported by the hoisting assembly. This configuration allows for a vast range of positions of the jib, using simple means such as cables and a winch.
Preferably, the tensioning member and the first lever arm of the spacer structure are embodied such that the tensioning member stays connected with the first lever arm in all positions of the boom and jib, while the second and third lever arm may disconnect from the tensioning member or support and engage the tensioning member depending on the position of the boom and jib.
For example, when the boom is in its lowered position, the tensioning member may extend from the first lever arm directly to the cable guide at the top of the column, while when the boom is in its raised position, the tensioning member is engaged and supported by the first second and third lever arm. It is noted that in an embodiment, the spacer structure may comprise four or more lever arms.
The tensioning member may comprise a cable portion, a chain portion, or interconnected elongated rods. In a possible embodiment the tensioning member comprises multiple articulated interconnected elongated rods, wherein the pivot points between the elongated rods are adapted to be engaged by the distal ends of the lever arms of the spacer structure. An advantage of such an embodiment is that slip of the elongated tensioning member over the extension guide is not possible.
In an embodiment, the jib tensioning member spacer structure comprises lever arms for engaging and supporting the jib tensioning member at the first, second and third support point only. In such an embodiment, the lever arms are for example each provided at a lateral end with a cradle in which the tensioning member is received.
The lever arms may be interconnected at their distal outer ends, but embodiments without such an interconnection are also conceivable. At their distal ends, the lever arms may be provided with a cradle for receiving the tensioning member, which cradle may be provided with a central groove or recess for receiving and positioning the tensioning member in a support position.
In an alternative embodiment, the spacer structure comprises a cradle which extends along the lateral ends of multiple lever arms, such that the tensioning member is supported between the lever arms as well. In such an embodiment, the lever arms can be configured as “spokes”, extending in a radial direction relative to the jib pivot axis, supporting a cradle which extends along a curved trajectory.
In an embodiment, the extended cradle defines a curvature to guide the tensioning member, preferably approximating a portion of a circle or oval, preferably having the second pivot axis as a center.
In an embodiment, the tensioning member may be fixed to one or more lever arms, preferably at a distal end thereof, thus forming a truss structure. In a possible embodiment the tensioning member comprises multiple articulated interconnected elongated rods, wherein the pivot points between the elongated rods are coupled with the distal ends of the lever arms of the spacer structure.
In a possible embodiment, one or more of the lever arms of the spacer structure are provided with a fork shaped end sections, for receiving a portion of the tensioning member. Any type of recess can be used for receiving a tensioning member section, for example, the cable portion can be embodied as a chain or cable.
Possibly, the curve of the extension guide is approximated by a polygon, e.g. formed by multiple interconnected straight surfaces. The tensioning member can in that case for example comprise multiple interconnected links of essentially the same length as the cooperating straight surfaces. The polygon can be formed by the distal outer ends of two or more ‘spokes’, preferably extending from a common central axis, preferably the jib pivot axis.
In an embodiment, the tensioning member comprises multiple articulated interconnected elongated rods. In a possible embodiment, the pivot points between the elongated rods are adapted to connect to the distal ends of the ‘spokes’ of the curved extension guide. An advantage of such an embodiment is that slip of the tensioning member over the curved extension guide is not possible.
In a possible embodiment, the tensioning member comprises a set of cables and sheaves, which cables are allowed to be hauled in and paid out by the jib winch to vary the length of the tensioning member. For example, the tensioning member comprises an end section, for example comprising multiple articulated interconnected elongated rods, which is connected to the tip of the jib, and an a luffing section, comprising a set of cables and sheaves, between the jib winch and the end section.
The mast crane comprises a column, which column is to be mounted with its foot to a vessel or is with its foot formed integral with a vessel such that the column is stationary relative to the vessel. This configuration, i.e. a stationary column provided with a slew bearings for supporting the boom and the cable guide rotatably relative to the column, is typical for mast cranes.
The foot of the column is preferably mounted on deck of the vessel, or it is also conceivable that the foot is formed integral with a portion of the hull and possibly the deck of the vessel, which may improve the overall stability of the crane.
The hollow column allows for cables to be guided from the top of the column to the foot of the column, and possibly into the hull of the vessel below the column, and to winches mounted inside the column or hull of the vessel respectively. Preferably, the winches are mounted on a rotatable winch support, which winch support can rotate about a vertical axis which coincides with the axis of rotation of the cable guide, which axis preferably coincide with the central axis of the column. Thus, the winches can follow the movement of the cable guide and boom.
The winch support preferably has an associated drive motor assembly for moving the winch support, in such a manner that the winch support maintains a substantially constant orientation with respect to the cable guide in the event of rotary movements of the cable guide, boom and jib about the vertical column.
In an embodiment, the mast crane is provided with a crane operator housing, for accommodating a mast crane operator, in which at least one operating member for operating the winches of the hoisting assembly and the boom and jib pivot assemblies are provided in the housing. The operator housing is adapted to slew, i.e. rotate, relative to the column to follow the position of the boom. In an embodiment, the operator housing is carried and guided by an annular bearing structure extending about the vertical column, so that the operator housing can rotate with the boom and jib about the vertical column.
It is noted that the use of a luffing device to position the main boom is known from, and similar to conventional cranes having a single boom. The main boom comprises an outer end and an opposite inner end which is connected pivotably about a first horizontal pivot axis to the crane housing, allowing an up-and-down movement of the main boom. The luffing device possibly comprises a luffing cable and a luffing winch. Varying the length of the luffing cable provides the main boom with a pivoting range of roughly 90°, such that the main boom can be pivoted between an essentially vertical upright position and a lowered position in which the main boom extends in a substantial horizontal position, i.e. at an angle of 90° with respect to the column of the mast crane.
It is noted that depending on the design of the mast crane, it may be possible to lower the boom below its horizontal position. In practice however, such a lowered position of the boom this is almost never required, and the design may be limited to lowering the boom in the substantial horizontal position.
In a possible embodiment, a vang is provided between the main boom and the jib. The vang in combination with the jib pivoting assembly is able to fixate the position of the jib with respect to the main boom. Possibly, the vang is connected to a central area of the main boom and to a central area of the jib. The vang can also be used to actively pull the jib towards the boom, i.e. towards its folded position.
When the boom is in an upright, vertical position, the jib can be raised to the vertical position in which the tip extends upwardly and the jib can be lowered to a vertical position in which the tip extends downwardly, and in which the jib is folded towards the boom. In a situation in which the boom is positioned horizontally, the jib tensioning member and the jib tensioning member spacer structure are able to pull the jib upwards to a position in which the tip extends substantially parallel to the boom, and to lower the jib until the tip of the jib extends downwards. However, in this situation the tensioning member is not able to pivot the jib further to a folded position in which the jib is folded towards or even along the boom. In this situation the provision of a vang is advantageous, as such a vang is able to pull the jib towards the boom. Thus, the vang is used to allow even more relative positions of the jib and boom.
Another advantage of a vang is that it may contribute to the fixation of the jib relative to the boom. In a general configuration, the jib is prevented from lowering by the tensioning member. The jib is prevented to move upwards by gravity, not only exerted on the jib itself but also on a load which is possibly suspended from the hoisting cable. However, due to sea state induced vessel motions, gravity, in particular when only exerted on the jib alone, may be insufficient to prevent small upward movements of the jib. The provision of a vang will fixate the jib relative to the boom.
Also, because of the jib pivoting assembly, the jib can be pivoted while the crane is supporting a load. Thus, a mast crane according to the invention can move the suspension point, i.e. the point where the hoist cable leaves the jib, in a horizontal direction. To operate the mast crane the boom and the jib are individually controlled using the boom pivoting assembly and the jib pivoting assembly respectively. In an embodiment, the mast crane is provided with control system which controls both the boom winch and the jib winch, and which control system is configured to control those winches such that the suspension point is moved in a horizontal direction towards or away from the column. In a further embodiment, the control system also controls the hoist winch in combination with the boom winch and the jib winch to move a load in a horizontal direction towards or away from the column.
The mast crane is provided with a hoisting winch and a hoisting cable, which hoisting cable leaves the column via sheaves at the cable guide and leaves the jib of the mast crane over a departing sheave at the tip of the jib to an object/load suspension device, which preferably comprises a hook or the like.
In an embodiment, the hoisting cable is allowed to run from the cable guide at the top of the mast to the tip of the jib, preferably via one or more sheaves located at the outer end of the boom and/or at the inner end of the jib.
In an embodiment the hoisting cable runs directly from the top of the mast to the distal end of the boom or jib. In an alternative embodiment, the hoist cable runs from the cable guide at the top of the mast downward, along the mast, to the inner end of the boom, and subsequently along the boom to the outer end of the boom end the jib.
It is noted that the hoisting cable may be provided in a multiple fall configuration between the tip of the end and the load suspension device. In such an embodiment, multiple sheaves are provided at the tip of the jib and on the load suspension device.
Upon actuation of the hoist winch the object suspension device can be raised and lowered. The hoist winch is preferably provided in the column, or below the column in the hull of the vessel,
The load suspension device of the hoisting assembly preferably comprises a crane hook or the like to connect the load. It is also conceivable that the load suspension device comprises a gripper or similar.
In an embodiment, a crane block is suspended from the hoisting cable, and wherein a crane block catcher device is provided between the crane block and the jib to secure the crane block with respect to the jib, at least to prevent swaying of the block with respect to the jib, when the crane block is fully raised.
In a further embodiment, the block catcher device comprises a pin and a receiver for the pin, and wherein preferably the pin is mounted on the crane block upwardly directed towards the jib and the receiver is mounted on the jib, and wherein preferably the receiver is suspended from a bearing arrangement at its top end, freely pivotable about a horizontal axis, e.g. about a shaft which also supports one or more cable pulleys.
In an embodiment, the jib tensioning member comprises a link section extending between the tip of the jib and the first support point, thus providing a truss.
In an embodiment, the vertical column has a substantially continuous outer wall.
In an embodiment, a horizontal section through the vertical column is substantially circular, and in which the cross section preferably decreases gradually towards the top of the column.
In an embodiment, the foot of the column is substantially rectangular.
In an embodiment, the lever arms have a triangular configuration, comprising a base and left and right point, and wherein the jib tensioning member comprises a left and right tensioner section for engagement and support at the left and right support points of the lever arms respectively.
In an embodiment, the boom slew bearing is rotated by boom slew bearing drives for slewing the boom, which boom slew bearing drives are provided on the outside of column.
In an embodiment, the mast crane comprises a control system that controls both the boom winch and the jib winch, and which control system is configured to control those winches such that the suspension point is moved in a horizontal direction away or towards the column.
In an embodiment, the operational range of the load suspension device relative to the center of the column - in a radial direction - extends between 13,5 m and 73,5 m.
In an embodiment, the load suspension device can be lifted up to at least 73 m, preferably up to at least 78 m, for example up to 84 m.
In an embodiment, the boom has a length in the range of 45 m - 55 m, for example in the range of 47 m - 53 m, for example has a length of 50 m.
In an embodiment, the jib has a length in the range of 15 m - 30 m, for example in the range of 20 m - 25 m, for example has a length of 23 m.
In an embodiment, the jib can be pivoted relative to boom between an extended position, in which a longitudinal axis of the jib and a longitudinal axis of the boom enclose an angle of 30 degrees, more preferably of 20 degrees and a folded position in which the a longitudinal axis of the jib and a longitudinal axis of the boom enclose an angle of 150 degrees, more preferably 160 degrees.
In an embodiment, the mast crane has a second hoisting assembly for lifting and lowering a load, the hoist second assembly comprising: a hoist winch and an associated hoisting cable; and a load suspension device, wherein the hoist winch is disposed in the vicinity of the foot of the vertical column, preferably in the column, so that the hoisting cable extends from the hoisting winch through the hollow vertical column and via the top cable guide and via at least one sheave at the tip of the jib to a second load suspension device, and wherein the hoist winch allows to vary the length of the hoisting cable and thus to lower and lift the second load suspension device.
In an embodiment, the hoisting device and the second hoisting device are each provided with a departing sheave at the tip of the jib, and wherein the rotational axis of the departure sheaves extend parallel to each other and substantially perpendicular to a longitudinal axis of the jib.
In a further embodiment, mast crane comprises a double load suspension device support at tip end of the jib for temporarily attaching the load suspension device and the second load suspension device to the jib when not in use.
In an embodiment, the mast crane is configured for hoisting loads up to 800 mt, more preferably up to 900 mt, most preferably up to 1000 mt with the hoisting device, preferably is provided with a second hoisting device and is configured to hoisting loads up to 800 mt, more preferably up to 900 mt, most preferably up to 1000 mt with each hoisting device.
In an embodiment, the column, including the cable guide, has a height in the range of 50 -60 m, for example has a height of 54 m, relative to the main deck level.
The invention furthermore provides a vessel comprising a mast crane according to the invention. In an embodiment, the column, including the cable guide, has a height in the range of 50 - 60 m, for example has a height of 54 m, relative to a main deck level of the vessel.
In an embodiment, the vessel further comprises a boom rest for supporting the boom in a rest position, which boom rest engages the boom at an outer end thereof, such that the column and the jib are located on opposite sides of the boom rest when the boos is in its rest position, wherein preferably the height of the boom rest is at least the length of the jib such that the jib can extend at a substantially right angle to the boom when the latter is in its support position on the boom rest.
Further advantageous embodiments of the hoisting crane according to the first aspect of the invention are described in the dependent claims and in the following description with reference to the drawing.
In the drawing:
Fig. 1 shows a side view of a mast crane, the crane having a boom and a jib according to the invention;
Fig. 2 shows a side view of the crane of Fig. 1 with the boom and jib shown in two working positions, wherein the jib is in an extended position;
Fig. 3 shows a side view of the crane of Fig. 1 with the boom and jib shown in two working positions, wherein the jib is in a folded position;
Fig. 4 shows a side view of the crane of Fig. 1 with the boom and jib shown in two working positions, wherein a tip of the jib in both working position located at the same height;
Fig. 5 shows a side view of the crane of Fig. 1 with the boom and jib shown in a rest position;
Fig. 6 shows a tip of the jib of a mast crane according to the invention provided with two hoisting assemblies.
Fig. 1 shows a side view of a mast crane 1 according to the invention.
The mast crane 1 comprises a hollow vertical column 2, a boom slew bearing 3, a boom 4, a tip 19, a cable guide slew bearing 5, a top cable guide 6.
The column 2 has a foot 7 and a top 8, and is stationary fixed to a vessel 9, of which only the working deck 14 is shown. The boom 4 has an inner end 21, a mid section 22 and an outer end 23.
The jib 19 has an inner end 24, a mid-section 25 and a tip 20 opposite the inner end of the jib. According to the invention, the inner end 24 of the jib 19 is connected pivotably about a horizontal jib pivot axis 26 to the outer end 23 of the boom 4, so that the jib 19 is pivotable between an extended position, for example shown in Fig. 1, and a folded position, for example shown in Fig. 3.
The boom slew bearing 3 is located at the foot 7 of the column 2 and extends around the stationary vertical column. The boom 4 is supported by the boom slew bearing 3, so that the boom 4 can rotate about the vertical stationary column 2. An inner end of the boom 4 is connected pivotably about a horizontal boom pivot axis 10 to the boom slew bearing 3, so that the boom can pivot up and down about the boom pivot axis.
The cable guide 6 comprises sheaves 11 for guiding cables into the hollow vertical column 2 at the top end 8 thereof. It 6 is supported by the cable guide slew bearing 5, which is located at the top 8 of the stationary vertical column 2, such that the cable guide 6 can follow rotary movements of the boom 4 about the vertical column 2 and adopts substantially the same angular position as the boom.
The mast crane 1 furthermore comprises a boom pivoting assembly for pivoting the boom up and down, a jib pivoting assembly for pivoting the jib relative to the boom, and a hoist assembly for lifting and lowering a load.
The boom pivoting assembly comprises a boom winch 12 and an associated luffing cable 13. The boom winch 12 is disposed in the vicinity of the foot 7 of the vertical column 2, in the embodiment shown below the column and below the deck 14 of the vessel 9.
The luffing cable 13 extends from the boom winch 12 through the hollow vertical column 2 and via the top cable guide 6 to the outer end of the boom 4. The boom winch 12 allows to vary the length of the luffing cable 13 and thus to position the boom 4.
The jib pivoting assembly, for pivoting the jib 19 relative to the boom 4 between its extended position and its folded position, comprises a jib winch 27 with an associated jib tensioning member 28, and a jib tensioning member spacer structure 29.
According to the invention, the jib tensioner spacer structure 29 shown comprises a first 30, second 31 and third lever arm 32 for supporting the jib tensioning member 28 at a first, second and third support point respectively. These support points are spaced in a radial direction relative to the jib pivot axis 26 and are located at different angular positions relative to the jib 19. The first support point, i.e. the point at which the first lever arm 30 engages the jib tensioning member 28, is located closest to the tip 19.
The jib winch 27 is disposed in the vicinity of the foot 7 of the vertical column 2, in the particular embodiment shown below the column and below the deck 14 of the vessel 9.
The jib tensioning member 28 extends from the jib winch 27 through the hollow vertical column 2, via the top cable guide 6 and over the jib tensioning member spacer structure 29 to the tip 20 of the jib 19. The jib winch 27 allows to vary the length of the jib tensioning member 28 and thus to position the jib 19. Furthermore, the jib tensioning member 28 and the jib tensioner spacer structure 29 are embodied such that, depending on the orientation of the jib 19, the tensioning member is engaged and supported by the first 30, or by the first 30 and second 31, or by the first 30, second 31 and third lever arm 32.
For example, Fig. 2 shows the mast crane of fig. 1 with the boom 4 and jib 19 in a first, raised, working position, and in a second, lowered, working position. In both working positions, the jib 19 is pivoted in the extend position relative to the boom 4.
In the first working position, the boom 4 is raised and the jib 19 is pivoted in its extended position, and the third lever arm 32 is disconnected form the jib tensioning member 28. In the second working position, the boom 4 is lowered and the jib 19 is pivoted in its extended position, and both the second 31 and third 32 lever arm are disconnected form the jib tensioning member 28.
The hoist assembly, for lifting and lowering a load, comprises a hoist winch 15 with an associated hoisting cable 16, and a load suspension device 17, in this embodiment a hook. The hoist winch 15 is disposed in the vicinity of the foot 7 of the vertical column 2, in the embodiment shown below the column and below the deck 14 of the vessel 9.
The hoisting cable 16 extends from the hoisting winch 15 through the hollow vertical column 2 and via the top cable guide 6 and via at last one sheave 18 at the tip 20 of the jib 19 to a load suspension device. The hoist winch 15 allows to vary the length of the hoisting cable 16 and thus to lower and lift the hook 17.
Providing the mast crane 1 with a pivotable jib 19, the jib supporting the hoist of the mast crane, enhances the reach of the mast crane. In its extended positions, for example shown in fig. 2, the jib 19 provides a reach beyond the length of the boom 4. While in its folded position it allows for lifting and lowering loads relatively close to the mast, see for example Fig. 3. With the pivotable jib 19 the working area is increased, enabling the mast crane to lift loads close to the mast as well as further away from the mast, compare Fig. 3 and Fig. 2.
Also, the pivotable jib allows for lifting large voluminous objects, such as jackets and top sides, close to the column. When the boom is pivoted upward, see for example fig. 1, the jib can be set at an angle relative to the boom, for example jib position depicted in the lowered working position shown in Fig. 3, to thus position the hook 17 at a distance from the boom 4, i.e. to offset the hoisting device relative to the boom, and prevent a voluminous object contacting the boom. Therefore a smaller crane can be used compared to a traditional fixed boom crane to perform similar operations.
Furthermore, with the pivotable jib 19 in its folded position, the mast crane 1 is provided with a low suspension point, see for example Fig. 3 and fig. 4. This low suspension point reduces the free hanging length 33 of the hoisting cable 16, and thus decreases the swinging motions of the load, which increases load control and safety aboard the vessel. Also, as the force of the load is introduced at a lower point of the crane, the stability of the vessel is increased. These features makes the crane safe and efficient.
According to the invention, the mast crane 1 is provided with a jib pivoting assembly comprising the jib winch 27 with an associated jib tensioning member 28, and the jib tensioning member spacing structure 29. The lever arms 30, 31,32 are configured to provide the jib tensioning member with leverage for pivoting the jib, i.e. to position the jib relative to the boom, even when a load is supported by the hoisting assembly. This configuration allows for a vast range of positions of the jib, using simple means such as cables and a winch.
Also, because of the jib pivoting assembly, the jib can 19 be pivoted while the crane is supporting a load. Thus, the mast crane 1 can move the suspension point, i.e. the point where the hoist cable leaves the jib, in a horizontal direction, which is shown in Fig. 4, which shows a side view of the crane of Fig. 1 with the boom 4 and jib 19 shown in two working positions, and wherein the tip 20 of the jib 19 in both working position is located at the same height relative to the deck 14 of the vessel 19.
To operate the mast crane 1, the boom 4 and the jib 19 are individually controlled using the boom pivoting assembly and the jib pivoting assembly respectively. In an embodiment, the mast crane is provided with control system which controls both the boom winch and the jib winch, and which control system is configured to control those winches such that the suspension point is moved in a horizontal direction towards or away from the column. In a further embodiment, the control system also controls the hoist winch in combination with the boom winch and the jib winch to move a load in a horizontal direction towards or away from the column.
In the shown embodiment, the jib tensioning member 28 comprises a first portion 34, configured to be guided by the tensioning member spacer structure 29, and a second portion 35, which extends between the first portion 34 of the jib tensioning member 28 and the jib winch 27, and of which second portion 35 the length may be varied by the jib pivoting winch to control the position of the jib.
In the embodiment shown, the first portion of the jib tensioning member 28 is connected to the tip of the jib 19, and is spaced relative to the jib pivot axis by the jib tensioning member spacing structure 29.
In the shown embodiment, the first portion 34 of the jib tensioning member 29 comprises a first rod 36 secured to the tip of the jib 19 and to the distal end of the first lever arm 30. The firs portion further comprises a second rod 37 and a third rod 38. The three rods of the first portion are pivotably connected, and thus form an articulated tensioning member section.
The second portion 35 of the jib tensioning member 28 comprises a cable, of which the length may be varied by the jib winch, which cable is guided over sheaves directly connected to interconnected elongated rods of the first portion of the tensioning member. In this embodiment, the pivot points between the elongated rods are adapted to connect to the distal ends of the ‘spokes’ 30, 31,32 a of the tensioning member spacing structure.
In order to position the main boom, a luffing cable is provided, extending between the main boom and the crane housing. The luffing cable is preferably connected to the outer end of the main boom, in particular to a sheave connected to the outer end of the main boom, or advantageously to one or more sheaves rotatable about the located at the outer end of the main boom. The luffing cable is preferably provided in a multiple fall configuration, i.e. is looped multiple times between the top of the column and the boom. 01 mast crane 02 hollow vertical column 03 boom slew bearing 04 boom 05 cable guide slew bearing 06 cable guide 07 foot column 08 top column 09 vessel 10 boom pivot axis 11 sheaves cable guide for guiding 12 boom winch 13 luffing cable 14 deck of vessel 15 hoist winch 16 hoisting cable 17 suspension device / hook 18 sheave at tip of jib 19 jib 20 tip of jib 21 inner end boom 22 mid-section boom 23 outer end boom 24 inner end jib 25 mid-section jib 26 jib pivot axis 27 jib winch 28 jib tensioning member 29 jib tensioning member spacer structure 30 first lever arm 31 second lever arm 32 third lever arm 33 free hanging length hoisting wire 34 first portion jib tensioning member 35 second portion jib tensioning member 36 first rod jib tensioning member 37 second rod jib tensioning member 38 third rod jib tensioning member

Claims (21)

1. Mastkraan, omvattende: een holle verticale kolom, waarbij de kolom een voet en een top heeft, welke kolom stationair is bevestigd, of is ingericht om stationair te worden bevestigd, aan een vaartuig; - een hoofdgieklager, welk hoofdgieklager is voorzien aan de voet van de kolom en zich uitstrekt rondom de stationaire verticale kolom; - een hoofdgiek, waarbij de hoofdgiek een binneneinde, middensectie, en een buiteneinde heeft, en waarbij de hoofdgiek wordt ondersteund door het hoofdgieklager, zodanig dat de hoofdgiek kan draaien rondom de verticale stationaire kolom, en waarbij het binneneinde van de hoofdgiek scharnierbaar om een horizontale hoofdgiekscharnieras is verbonden met het hoofdgieklager, zodanig dat de hoofdgiek naar boven en beneden kan scharnieren om de hoofdgiekscharnieras; - een giek, waarbij de giek een binneneinde, een middensectie en een tip tegenover het binneneinde van de tip heeft, waarbij het binneneinde van de giek scharnierbaar om een horizontale giekscharnieras is verbonden met het einde van de hoofdhoofdgiek, zodat de giek scharnierbaar is tussen een uitgestrekte stand en een opgevouwen stand; - een kabelgeleidingslager, welk kabelgeleidingslager is voorzien aan de top van de stationaire verticale kolom; - een kabelgeleiding, welke kabelgeleiding schijven omvat voor het in de holle verticale kolom geleiden van kabels aan het boveneinde daarvan, waarbij de topkabelgeleiding wordt ondersteund door het kabelgeleidingslager, zodanig dat de top kabelgeleiding draaibewegingen van de hoofdgiek om de verticale kolom kan volgen en in hoofdzaak dezelfde hoekpositie inneemt als de hoofdgiek; - een hoofdgiekscharniersamenstel voor het op en neer scharnieren van de hoofdgiek, waarbij het hoofdgiekscharniersamenstel omvat: een hoofdgieklier en een geassocieerde loefkabel, waarbij de gieklier is aangebracht in de nabijheid van de voet van de verticale kolom, bij voorkeur in de kolom, zodanig dat de loefkabel zich uitstrekt van de lier door de holle verticale kolom en via de topkabelgeleiding naar het buiteneinde van de hoofdgiek, en waarbij de hoofdgieklier het mogelijk maakt om de lengte van de loefkabel, en dus de positie van de hoofdgiek, te variëren; - een giekscharniersamenstel voor het ten opzichte van de hoofdgiek scharnieren van de giek tussen zijn uitgestrekte positie en zijn opgevouwen positie, waarbij het giekscharniersamenstel omvat: een gieklier en een geassocieerd giekspanelement; en een giekspanelement afstandshouderconstructie, waarbij de afstandshouderconstructie ten minste omvat een eerste, tweede en derde hefboom voor het ondersteunen van het giekspanelement op respectievelijk een eerste, tweede en derde ondersteuningspunt, welke ondersteuningspunten in radiale richting ten opzichte van de giekscharnieras zijn gespatieerd en zijn gelokaliseerd op verschillende hoekposities ten opzichte van de giek, waarbij het eerste gieksteunpunt het dichtste bij de giek is gepositioneerd, waarbij de hoofdgieklier is voorzien in de nabijheid van de voet van de verticale kolom, bij voorkeur in de kolom, zodat het spanelement zich uitstrekt van de gieklier door de holle verticale kolom, via de topkabelgeleiding en over de giekspanelement afstandshouderconstructie maar de tip van de giek, waarbij de gieklier het mogelijk maakt om de lengte van het spanelement te variëren en aldus de giek te positioneren, en waarbij het spanelement en de afstandshouderconstructie zodanig zijn gevormd dat, afhankelijk van de oriëntatie van de giek, het spanelement wordt aangegrepen door de eerste, of door de eerste en tweede, of door de eerste, tweede en derde hefboom; - een hijssamenstel voor het optillen en neerlaten van een last, waarbij het hijssamenstel omvat: een hijslier en een geassocieerde hijskabel; en een lasttilinrichting, waarbij de hijslier is voorzien in de nabijheid van de voet van de verticale kolom, bij voorkeur in de kolom, zodanig dat de hijskabel zich uitstrekt van de hijslier door de holle verticale kolom en via de topkabelgeleiding en via ten minste een schijf bij de tip van de giek naar een lastdraaginrichting, en waarbij de hijslier het mogelijk maakt de lengte van de hijskabel te variëren en dus de lasttilinrichting op te tillen en neer te laten.A mast crane, comprising: a hollow vertical column, the column having a base and a top, which column is stationary attached or arranged to be stationarily attached to a vessel; - a main boom bearing, which main boom bearing is provided at the base of the column and extends around the stationary vertical column; - a main boom, wherein the main boom has an inner end, center section, and an outer end, and wherein the main boom is supported by the main boom bearing, such that the main boom can pivot around the vertical stationary column, and wherein the inner end of the main boom pivots about a horizontal main boom pivot axis is connected to the main boom bearing such that the main boom can pivot up and down about the main boom pivot axis; a boom, the boom having an inner end, a middle section, and a tip opposite the inner end of the tip, the inner end of the boom pivotally connected about a horizontal boom pivot axis to the end of the main boom, so that the boom is pivotable between a extended position and a folded position; - a cable guide bearing, which cable guide bearing is provided at the top of the stationary vertical column; a cable guide, which cable guide disks comprises for guiding cables in the hollow vertical column at the upper end thereof, the top cable guide being supported by the cable guide bearing, such that the top cable guide can follow rotational movements of the main boom about the vertical column and substantially occupies the same angular position as the main boom; - a main boom hinge assembly for hinging the main boom up and down, the main boom hinge assembly comprising: a main boom gland and an associated windlass, the boom gland being arranged in the vicinity of the base of the vertical column, preferably in the column, such that luffing cable extends from the winch through the hollow vertical column and via the top cable guide to the outer end of the main boom, and wherein the main boom gland makes it possible to vary the length of the luffing cable, and thus the position of the main boom; - a boom hinge assembly for hinging the boom relative to the main boom between its extended position and its collapsed position, the boom hinge assembly comprising: a boom winch and an associated boom clamp element; and a boom tensioning element spacer structure, the spacer structure comprising at least a first, second and third lever for supporting the boom tensioning element on a first, second and third support point, respectively, which support points are spaced radially with respect to the boom pivot axis and are located on different angular positions with respect to the boom, the first boom support point being positioned closest to the boom, the main boom gland being provided in the vicinity of the base of the vertical column, preferably in the column, so that the tension element extends from the boom gland through the hollow vertical column, via the top cable guide and over the boom tensioning element spacer structure but the tip of the boom, wherein the boom winch makes it possible to vary the length of the tensioning element and thus position the boom, and wherein the tensioning element and the spacer structure to be formed that, depending on the orientation of the boom, the tensioning element is engaged by the first, or by the first and second, or by the first, second and third lever; - a hoisting assembly for lifting and lowering a load, the hoisting assembly comprising: a hoisting winch and an associated hoisting cable; and a load lifting device, wherein the hoisting winch is provided in the vicinity of the base of the vertical column, preferably in the column, such that the hoisting cable extends from the hoisting winch through the hollow vertical column and via the top cable guide and via at least one disk at the tip of the boom to a load carrying device, and wherein the hoisting winch makes it possible to vary the length of the hoisting cable and thus to lift and lower the load lifting device. 2. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij een neerhouder is aangebracht tussen de hoofdgiek en de giek om de positie van de giek ten opzichte van de hoofdgiek te positioneren en / of te fixeren.2. Mast crane as claimed in one or more of the foregoing claims, wherein a downholder is arranged between the main boom and the boom to position and / or fix the position of the boom relative to the main boom. 3. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij het giekspanelement een link sectie omvat die zich uitstrekt tussen de tip van de giek en het eerste steunpunt, en aldus voorziet in een steunconstructie (truss).3. Mast crane as claimed in one or more of the foregoing claims, wherein the boom clamping element comprises a link section which extends between the tip of the boom and the first support point, and thus provides a support construction (truss). 4. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de verticale kolom een in hoofdzaak continue buitenwand heeft.Mast crane according to one or more of the preceding claims, wherein the vertical column has a substantially continuous outer wall. 5. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij een horizontale sectie door de kolom in hoofdzaak cirkelvormig is, en waarbij de doorsnede bij voorkeur afneemt richting de top van de kolom.Mast crane as claimed in one or more of the foregoing claims, wherein a horizontal section through the column is substantially circular, and wherein the cross-section preferably decreases towards the top of the column. 6. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de voet van de kolom in hoofdzaak rechthoekig is.Mast crane according to one or more of the preceding claims, wherein the base of the column is substantially rectangular. 7. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de hefbomen een driehoekige configuratie hebben, met een basis linker en rechter punt, en waarbij het giekspanelement een linker en rechter spansectie omvat voor aangrijpen en ondersteunen bij de linker en rechter steunpunten van de respectievelijke hefboomarmen.Mast mast according to one or more of the preceding claims, wherein the levers have a triangular configuration, with a base left and right point, and wherein the boom clamping element comprises a left and right clamping section for engaging and supporting at the left and right support points of the respective lever arms. 8. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij het hoofdgieklager wordt verdraaid door hoofdgieklager aandrijvingen voor het roteren (slewing) van de hoofdgiek, waarbij de hoofdgieklageraandrijvingen zijn voorzien aan de buitenkant van de kolom.Mast crane according to one or more of the preceding claims, wherein the main boom bearing is rotated by main boom bearing drives for rotating (slewing) the main boom, wherein the main boom bearing drives are provided on the outside of the column. 9. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de mastkraan een controlesysteem omvat dat zowel de hoofdgieklier als de gieklier controleert, en welk controlesysteem is ingericht om deze lieren zodanig te controleren dat het steunpunt in horizontale richting van en naar de kolom wordt bewogen.Mast crane according to one or more of the preceding claims, wherein the mast crane comprises a control system that controls both the main gland and the gland, and which control system is arranged to control these winches in such a way that the support point is moved horizontally from and to the column moved. 10. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de operationele range van de lasttilinrichting ten opzichte van het midden van de kolom -in radiale richting - zich uitstrekt tussen de 13,5 en de 73,5 m.Mast crane according to one or more of the preceding claims, wherein the operational range of the load lifting device with respect to the center of the column - in radial direction - extends between 13.5 and 73.5 m. 11. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de lasttilinrichting kan worden opgetild tot ten minste 73 m, en bij voorkeur tot ten minste 78 m, bijvoorbeeld tot 84 m.Mast crane according to one or more of the preceding claims, wherein the load lifting device can be lifted to at least 73 m, and preferably to at least 78 m, for example up to 84 m. 12. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de hoofdgiek een lengte heeft in de range van 45 m - 55 mm bijvoorbeeld in de range van 47 m - 53 m, bijvoorbeeld een lengte heeft van 50 m.12. Mast crane according to one or more of the preceding claims, wherein the main boom has a length in the range of 45 m - 55 mm, for example in the range of 47 m - 53 m, for example a length of 50 m. 13. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de giek een lengte heeft in de range van 15 m - 30 m, bijvoorbeeld in de range van 20 m - 25 m, bijvoorbeeld een lengte heeft van 23m.Mast crane according to one or more of the preceding claims, wherein the boom has a length in the range of 15 m - 30 m, for example in the range of 20 m - 25 m, for example a length of 23 m. 14. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de giek kan worden gescharnierd ten opzichte van de hoofdgiek tussen een uitgestrekte positie, waarin een lengteas van de giek en een lengteas van de hoofdgiek een hoek van 30 graden insluiten, bij verdere voorkeur van 20 graden en een gevouwen positie waarin de lengteas van de giek en een lengteas van de hoofdgiek een hoek van 150 graden insluiten, bij verder voorkeur van 150 graden.Mast boom according to one or more of the preceding claims, wherein the boom can be pivoted with respect to the main boom between an extended position, in which a longitudinal axis of the boom and a longitudinal axis of the main boom enclose an angle of 30 degrees, more preferably of 20 degrees and a folded position in which the longitudinal axis of the boom and a longitudinal axis of the main boom enclose an angle of 150 degrees, more preferably of 150 degrees. 15. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de mastkraan een tweede hijssamenstel heeft voor het optillen en neerlaten van een last, waarbij het tweede hijssamenstel omvat: een hijslier en een geassocieerde hijskabel; en een lasttilinrichting, waarbij de hijslier is voorzien in de nabijheid van de voet van de verticale kolom, bij voorkeur in de kolom, zodanig dat de hijskabel zich uitstrekt van de hijslier door de holle verticale kolom en via de top kabelgeleiding en via de ten minste ene schijf bij de top van de giek naar een tweede lasttilinrichting; en waarbij de hijslier het mogelijk maakt om de lengte van de hijskabel te variëren en aldus de tweede lasttilinrichting op te tillen en neer te laten.Mast crane according to one or more of the preceding claims, wherein the mast crane has a second hoisting assembly for lifting and lowering a load, the second hoisting assembly comprising: a hoisting winch and an associated hoisting cable; and a load lifting device, wherein the hoisting winch is provided in the vicinity of the base of the vertical column, preferably in the column, such that the hoisting cable extends from the hoisting winch through the hollow vertical column and via the top cable guide and via the at least cable guide one disk at the top of the boom to a second load lifting device; and wherein the hoisting winch makes it possible to vary the length of the hoisting cable and thus to lift and lower the second load lifting device. 16. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de lasttilinrichting en de tweede lasttilinrichting ieder zijn voorzien van een uitvoerschijf bij de tip van de giek, en waarbij de rotatieassen van de uitvoerschijven zich parallel aan elkaar uitstrekken en in hoofdzaak loodrecht p[ een lengteas van de giek.Mast crane as claimed in one or more of the foregoing claims, wherein the load lifting device and the second load lifting device are each provided with an output disc at the tip of the boom, and wherein the rotational axes of the output discs extend parallel to each other and substantially perpendicularly p a longitudinal axis of the boom. 17. Mastkraan volgens conclusie 15 of 16, verder omvattende een dubbele lasttilinrichting ondersteuning bij het tip einde van de giek voor het tijdelijk bevestigen van de lasttilinrichting en de tweede lasttilinrichting aan de giek wanneer ze niet worden gebruikt.17. Mast crane as claimed in claim 15 or 16, further comprising a double load lifting device support at the tip end of the boom for temporarily attaching the load lifting device and the second load lifting device to the boom when they are not being used. 18. Mastkraan volgens een of meer van de voorgaande conclusies, waarbij de mastkraan is ingericht voor het tillen van lasten tot 800Mt, bij grotere voorkeur tot 900 Mt, bij grootste voorkeur toto 1000 Mt met de lasttilinrichting, bij voorkeur is voorzien van een tweede tilinrichting en is ingericht voor het tillen van lasten tot 800 Mt, bij grotere voorkeur tot 900 Mt, bij grootste voorkeur tot 1000 Mt met iedere tilinrichting.Mast crane as claimed in one or more of the foregoing claims, wherein the mast crane is adapted to lift loads up to 800 Mt, more preferably up to 900 Mt, most preferably up to 1000 Mt with the load lifting device, preferably provided with a second lifting device and is adapted to lift loads of up to 800 Mt, more preferably up to 900 Mt, most preferably up to 1000 Mt with each lifting device. 19. Vaartuig voorzien van een mastkraan volgens een of meer van de voorgaande conclusies.19. Vessel provided with a mast crane according to one or more of the preceding claims. 20. Vaartuig volgens conclusie 19, waarbij de kolom, inclusief de kabelgeleiding, een hoogte heeft in de range van 50 - 60 m, bijvoorbeeld een hoogte heeft van 54 m, ten opzichte van het hoofddek niveau.A vessel according to claim 19, wherein the column, including the cable guide, has a height in the range of 50 - 60 m, for example a height of 54 m, relative to the main deck level. 21. Vaartuig volgens conclusie 19 of 20, waarbij het vaartuig verder omvat een hoofdgieksteun voor het ondersteunen van de hoofdgiek in een steunpositie, welke hoofdgieksteun aangrijpt op de hoofdgiek bij een buiteneinde daarvan, zodanig dat de kolom en de giek zijn gelokaliseerd aan tegenovergelegen zijden van de hoofdgieksteun wanneer de hoofdgiek zich in zijn steunpositie bevindt, waarbij bij voorkeur de hoogte van de hoofdgieksteun ten minste de lengte van de giek bedraagt zodanig dat de giek zich kan uitstrekken onder een in hoofdzaak rechte hoek ten opzichte van de hoofdgiek wanneer de laatste zich in zijn steunpositie op de hoofdgieksteun bevindt.The vessel of claim 19 or 20, wherein the vessel further comprises a main boom support for supporting the main boom in a support position, which main boom support engages the main boom at an outer end thereof, such that the column and boom are located on opposite sides of the main boom support when the main boom is in its support position, the height of the main boom support preferably being at least the length of the boom such that the boom can extend at a substantially right angle to the main boom when the latter is in its supporting position on the main boom support.
NL2015896A 2015-12-02 2015-12-02 Mast crane and offshore vessel. NL2015896B1 (en)

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