Crane subassembly for installing a tub mounted crane.
Patent Information
- Application Number
- NL2039029
- Authority / Receiving Office
- NL · NL
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2026-06-08
- Estimated Expiration
- 2044-11-07
Smart Images
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Abstract
Description
P37003NL02 / KHO Title: Crane subassembly for installing a tub mounted crane. The invention relates to a crane subassembly including a crane house for installation of a tub mounted crane and an installation method in which the crane subassembly is used. NL8600551 discloses a tub mounted crane having a tub, a crane house, a gantry and a boom. The tub mounted crane is arranged for heavy lifting purposes and has a tub diameter of at least 15m. The crane house is mounted onto the tub and has a slew bearing flange at a lower section to allow the crane house to rotate relative to the tub. The boom is pivotable about a horizontal axis connected to a boom connector of the crane house. The boom connector is rigidly fixated to the crane house to obtain a proper load distribution from a hoisting hook to the tub. The gantry has a front framework which is connected to a front base mount at the boom connector and a rear framework being connected at a rear base mount at an upper side of the crane house. The tub mounted crane comprises a plurality of winches inside the crane house. The winches are installed on a floor of the crane house. WO18143807 discloses a crane housing ofa tub mounted crane. The crane housing comprises a cylinder-shaped circumferential wall with a lower section being delimited by a lower end of the wall. The lower end is adapted to be mounted to a slew bearing. An upper section of the circumferential wall is delimited by an upper end of the wall. The tub mounted crane has a winch carrier, also called a back pack or a winch unit, which is supported by the crane housing at a rear side. The winch unit comprises one or more winches. A luffing winch of the winch unit is operable to set a boom angle of the boom by using one or more luffing wires extending between a gantry apex and an outer end of the boom. At leastone other winch of the winch carrier is operable to haul in and payout a hoisting wire to lift or lower a hoist load. The weight of the winch unit at the rear side of the crane housing is beneficially used as a ballast. The crane housing is provided with a floor which at least partially closes off a bottom of the cylinder-shaped wall. The floor is arranged to support further equipment, like electronic equipment, additional winches and or slew drive motors of the crane inside crane housing. W02024 / 0101453 discloses a similar crane house. Here, the crane house is called a support structure for a crane. The support structure has a lower end with a circularshape for connecting _ 2 _ it with a slew bearing. The support structure has an upper end with a polygonal shape defined by a peripheral box frame for supporting a boom and a gantry, here called a support frame, of the crane. The box frame allows a central opening in which equipment or a jack-up leg can be accommodated. These tub mounted cranes are very large structureswhich are capital intensive. It is a challenge to reduce involved capital investments. Regarding the above-mentioned prior art, it is remarked that any discussion ofdocuments, acts, materials, devices, articles or the like included in the present specification is for the purpose of providing a context for the present invention, and is not to be taken as an admission that any such matters form part of the prior art or were common general knowledge in the field relevant to the present invention before the priority date of each claim of this application. The general object ofthe present invention is to at least partially eliminate the above mentioned drawback and / or to provide a usable alternative. More specific, it is an object of the invention to provide a crane subassembly which allows a reduction of involved capital investments in building a tub mounted crane. According to the invention, this object is achieved by a crane subassembly according to claim 1. According to the invention, a crane subassembly for installation of a tub mounted crane is provided which comprises a crane house and a winch carrier. The crane house has a circumferential wall which defines an inner space. The circumferential wall has a lower section delimited by a lower end of the wall and an upper section delimited by an upper end of the wall. The lower end is adapted to be mounted to a slew bearing. Particularly, the lower section is provided with a slew bearing flange. At an upper region, the crane house has a boom connector for mounting a boom to the crane house. Further, at the upper region, the crane house has at least one base mount for mounting a gantry to the crane house. The winch carrier is arranged to carry several winches. The winch carrier may be arranged to support one or more luffing winches and / or one or more hoisting winches. The winch carrier _ 3 _ has a carrier body. The carrier body includes a platform for supporting several winches. The platform is provided with a plurality ofwinch seats for each receiving a winch. The crane subassembly according to the invention provides an improvement in that the crane house comprises a plurality of carrier mounts and in that the winch carrier comprises an associated plurality of complementary carrier mounts for mounting the winch carrier to the crane house. The carriermounts may enable a releasable connection ofthe winch carrier inside the inner space to the crane house. Preferably, at least one of the carrier mounts of the crane house and the complementary carrier mounts of the winch carrier provide a pin-hole assembly for mounting the winch carrier to the crane house by insertion of a pin-shaped element through a hole of a mounting. Beneficially, the winch carrier including several winches can be installed and tested in a preparing step before installing the winch carrier inside the crane house. The winch carrier including several winches can be installed and tested at another location remote from a construction site where the crane house is built. After installation and fulfilling test requirements, the winch carrier can be transported to the crane house, whereafter the crane house and winch carrier can be assembled together. The crane subassembly allows an installation method according to the invention in which the winch carrier provided with several pre-assembled winches is subsequently mounted to the crane house. Herewith, a logistic advantage, can be achieved which allows a reduction of capital investment in building a tub mounted crane. In an embodiment of the crane subassembly, the plurality of carrier mounts are positioned at an inner side of the circumferential wall of the crane house. Particularly, the plurality of carrier mounts are positioned ata middle section of the circumferential wall in which the middle section is provided with stiffeners. Herewith, the winch carrier can be mounted to the crane house in a rigid manner which allows a proper load distribution during hoisting. In an embodiment of the crane subassembly, the platform has a rectangular outer shape. The complementary carrier mounts are provided along an outer edge region of the platform. Particularly, each corner of the platform is provided with a complementary carrier mount. In an embodiment of the crane subassembly, the several winch seats on the platform are positioned in an array. Particularly, the platform comprises at least two arrays ofwinch seats. In an embodiment of the crane subassembly, all hoisting winches and particularly all luffing winches are carried by the winch carrier. All hoisting and possibly all luffing winches are positioned on the winch carrier in a pre-assembly. The hoisting and luffing winches are the _ 4 _ largest winches of a tub mounted frame. Beneficially, all hoisting winches are installed on the winch carrier and can be tested before mounting the winch carrier to the crane house. In an embodiment of the crane subassembly, a rear outer side of the crane house remains free from a winch assembly, a so-called backpack of winches. Beneficially, the available space at the rear side of the crane house enables other operations, like a gantry lowering operation in which a rear framework of the gantry is lowered along the rear side of the crane house. In an embodiment of the crane subassembly, the crane subassembly further comprises an assembly structure, also called an assembly table, which is configured for aligning the winch carrier with respect to the crane house. The assembly structuremay include separate assembly frames being combined together to support a which carrier. The separate assembly frames may together form the assembly table. The assembly table has a table frame which defines a predetermined table height corresponding with a built-in height of the winch carrier relative to the crane house. In particular, the assembly table comprises a plurality ofcrane house supports for levelling the crane house relative to a winch carrier being placed on the table frame. Herewith, the built-in height is determined by the crane house supports. Preferably, the crane house supports are connected to the table frame. Alternatively, a crane house support may be a separate item which can for example be placed onto a ground surface aside the table frame for supporting and levelling the crane house. In a variant, at least one of the crane house supports may be connected to the winch carrier. In an embodiment of the crane subassembly, the crane house has an open bottom side. The crane house may lack a crane house floor. The crane house may have a partly open crane house floor extending around the circumferential wall. Preferably, the crane house has a ring- shaped crane house floor at the lower section which leaves an open mid area. In particular, the winch carrier is mountable to the crane house after placement of the winch carrier in the mid area. The open bottom side of the crane house allows an installation method according to the invention, wherein in a step the crane house is positioned from above over the winch carrier. The crane house can be lowered onto the winch carrier being positioned on the assembly structure, whereafter the winch carrier is mounted to the crane house. In an embodiment of the crane subassembly, the crane house has a crane house deck which is open worked to allow wires originating from winches below the crane house deck to pass along. The crane house deck partially closes of a top of the circumferential wall. _ 5 _ Further, the invention relates to a tub mounted crane for transferring a hoist load, which the mounted crane comprises a substructure, also called a tub, on which a superstructure including operating machinery is mounted, wherein the superstructure comprises a crane subassembly according to the invention as described above. The tub mounted crane comprises a crane house, a boom connected to the crane house, a gantry, also called a luffing frame, for supporting the boom, a hoisting system for hoisting the hoist load, and a boom hoist for raising and lowering the boom. The crane house is rotatably connected to the tub for allowing a slew motion of the superstructure relative to the tub around a vertical axis. The crane house comprises a boom connectorwhich defines a horizontal boom pivot axis for connecting a boom to the crane house. The boom is arranged to support a hoist load. The boom has a longitudinal axis extending from a proximal end portion to a distal end portion which includes a head structure. The boom is pivotally connected to the crane house via the boom connector, so that the boom is pivotal about a boom pivot axis. The gantry is arranged to support the boom and is mounted to the crane house. The hoisting system is arranged for hoisting the hoist load. The hoisting system comprises at least one hoisting winch with an associated hoisting wire. The hoisting wire extends from the hoisting winch to the head structure of the boom. The boom hoist is arranged for raising and lowering the boom by pivoting the boom about the boom pivot axis over a boom angle. The boom hoist comprises at least one boom hoist winch, also called a luffing winch, for hauling in and paying out a luffing wire to respectively raise and lower the boom. The boom hoist comprises a boom suspension for supporting the boom. The boom suspension extends between a top of the gantry, also called a gantry apex, and the head structure of the boom. The tub mounted crane according to the invention is improved in that a crane subassembly is provided including a winch carrier having a carrierbodywhich includes a platform for supporting several winches, wherein the carrier body is provided with several winch seats for each receiving a winch and in that the crane house comprises a plurality of carrier mounts and in that the winch carrier comprises an associated plurality of complementary carrier mounts for mounting the winch carrier to the crane house. In an embodiment of the tub mounted crane, the winch carrier comprises at least four winch seats. In particular, the winch carrier comprises side-by-side positioned winch seats. Preferably, the winch carrier comprises eight winch seats. More preferably, the winch carrier comprises two arrays of side-by-side positioned winches, in particular eight side-by-side positioned winches. _ 6 _ In an embodiment of the tub mounted crane, the winch carrier is releasably mounted to the crane house. The winch carrier is mounted by a mechanical connection to the crane house which allows a de-mounting of the winch carrier. Preferably, the winch carrier is mounted by a pin-hole assembly to the crane house. Alternatively, the winch carrier may be welded to the crane house. Further, the invention relates to an installation method for assembling a crane subassembly to a substructure of a crane. In particular, the installation method is configured for assembling a crane subassembly to a substructure, a so-called tub, ofa tub mounted crane. In the installation method, use is made of a crane subassembly including a crane house and a winch carrier. Preferably, use is made ofa crane subassembly according to the invention as described above. The method comprises a step of placing the winch carrier on an assembly structure, also called an assembly table, for assembling several winches to the winch carrier. The method comprises a step of assembling several winches to the winch carrier, wherein each winch carrier is mounted to a winch seat of a carrier body. The method comprises a step of placing a crane house over the winch carrier. The method comprises the step of lowering the crane house relative to the winch carrier to align winch carrier mounts at an inner side over a circumferential wall of the crane house with associated complementary winch carrier mounts at the winch carrier. The method comprises the step of connecting the winch carrier mounts of the crane house to the complementary winch carrier mounts of the winch carrier. Preferably, the winch carrier is connected to the crane house by a mechanical connection, like a bolt connection or a pin-hole assembly. In an embodiment of the installation method, the winch carrier is connected by welding to the crane house. The connection of the carrier mounts of the crane house to the complementary carrier mounts of the winch carrier may be carried out by welding, wherein a carrier mount include a weld stud to be welded to an associated weld stud of a complementary carrier mount. In an embodiment of the installation method, the method further comprises a step of testing a functionality of each winch installed on the carrier body. The testing may be carried out a pre- assembly phase before connecting the winch carrier to the crane house. The testing may be carried out in a preparational step before placement of the crane house. Herewith, a test protocol to be carried out after an assembly of the winch carrier to the crane house can be shortened which may provide a logistic advantage and reduce costs involved. In an embodiment of the installation method, the crane subassembly of the winch carrier and the crane house is assembled in a preparational step ata location remote from the substructure. _ 7 _ The crane subassembly is assembled before placing the crane subassembly onto the substructure of a crane be assembled. The crane house including the winch carrier is in an assembled condition placed onto the substructure. In an alternative embodiment of the installation method, the crane subassembly is mounted at the substructure of the crane in separate steps. In a step of the installation method, the winch carrier is positioned onto the substructure and subsequently in a next step of the installation method, the crane house is positioned above and lowered onto the substructure. In particular, in carrying out the installation method by these successive steps, the assembly table for positioning the winch carrier relative to the substructure is connected to the substructure. Thus, the invention provides a crane subassembly including a crane house and a winch carrier and an installation method for assembling the crane subassembly to a substructure of a crane. The winch carrier has a carrier body for supporting several winches on several winch seats. The crane house comprises a plurality of carrier mounts and the winch carrier comprises an associated plurality of complementary carrier mounts for mounting the winch carrier to the crane house. In the installation method, the crane house is lowered relative to the winch carrier being placed on an assembly table to level the carrier mounts with each other. Instead of successively placing the winch carrier onto the substructure and then lowering the crane house, preferably, the crane assembly is assembled at another location before placement onto the substructure. The invention will be explained in more detail with reference to the appended drawings. The drawingsshow a practical embodiment according to the invention, which may not be interpreted as limiting the scope of the invention. Specific features may also be considered apart from the shown embodiment and may be taken into account in a broader context as a delimiting feature, not only for the shown embodiment but as a common feature for all embodiments falling within the scope of the appended claims, in which: Fig. 1 shows a side view of a tub mounted crane which has a tub which is mounted to a hull of a vessel, a superstructure having an upstanding gantry on top of a slewable crane house and an extending boom supported by a boom rest; Fig. 2 shows an enlarged view of the gantry of the tub mounted crane which is provided with a lowering mechanism for raising and lowering the gantry to obtain a total crane height reduction; _ 8 _ Fig. 3 and 4 show a backwards tilting of a front framework of the gantry, wherein a base of a rear framework is lowered along a back side of the crane house and guided by a link framework of the lowering mechanism until the link framework abuts against an end stop at the tub; Fig. 5 shows an enlarged view of the crane house which is provided with a boom connector defining a horizontal boom pivot axis, a front base mount for mounting the front framework and a rear base mount for mounting the rear framework to the crane house, wherein a tugger winch is provided for tensioning the base of the rear framework in case of an operation of the lowering mechanism; Fig. 6 shows an enlarged view of the base of the rear framework being positioned in a seat forming the rear base mount and wherein the base of the rear framework is connected to a link framework of the lowering mechanism; Fig. 7 shows a side view of Fig. 6 in which the base of the rear framework has a fork end provided with a fork end hole in alignment with upstanding plates with plate holes for receiving a pin to fasten the base of the rear framework by a pin-hole assembly; Fig. 8 is an enlarged view of Fig. 6 in which the link framework is not shown; Fig. 9 shows a head structure on a distal portion of the boom including a jib provided with an auxiliary load suspension device and a whip line; Fig. 10 shows a side view of a vessel crane having a boom suspension extending from a gantry apex of a gantry on top of a crane house and a distal boom end portion of a boom, wherein the boom suspension has a multiple fall arrangement of luffing wire reeved between sheaves, wherein at least one sheave is detachable to adapt the multiple fall arrangement; Fig. 11 shows the multiple fall arrangement of the boom suspension in a frontal view including a detachable sheave block which is transferable between a gantry sheave block at the gantry apex and a boom sheave block at the distal boom end portion of the boom; Fig. 12 shows an enlarged view of the gantry sheave block of Fig. 11 being connected to the detachable sheave block; Fig. 13 shows an enlarged view of a transfer winch for displacing the detachable sheave block being situated at the distal boom end portion; Fig. 14 shows a sectional side view of an embodiment of a crane subassembly according to the invention having a winch carrier mounted in an innerspace of a crane house by carrier mounts; Fig. 15 and 16 show respectively and upper and lower perspective view of a cylindrical shaped crane house of a tub mounted crane; Fig. 17 shows a side view of the winch carrier of Fig. 14 which winch carrier supports several winches on winch seats; _ g _ Fig. 18 shows a top view of the crane subassembly of Fig. 14 wherein two arrays of winches are carried by a winch carrier; Fig. 19 - 21 show an embodiment of an installation method for assembling a crane subassembly, wherein in successive steps a winch carrier is provided with winches on an assembly table, a crane house is lowered and mounted to the winch carrier, and the crane house is placed together with the winch carrier on top of a substructure; Fig. 22 and 23 show an alternative embodiment of an installation method, wherein a winch carrier is first placed on a substructure, whereafter a crane house is lowered and mounted to the winch carrier. Fig. 14-23 Show an embodiment of a crane subassembly 12 according to the invention which includes a crane house 2 and a winch carrier 2, and an embodiment of an installation method according to the invention. According to an aspect of the invention, in Figs. 1-23, a vessel crane, in particular a tub mounted crane, is shown in an embodiment according to the invention and denoted overall by reference numeral 1. Identical reference signs are used in the drawings to indicate identical or functionally similar components. The tub mounted crane 1 is provided on board of a crane vessel 100. The tub mounted crane 1 has a pedestal, also called a tub 10, which is mounted to a hull 101 of the crane vessel. The crane vessel is configured for heavy lifting, e.g. more than 1500Mtons, in particular more than 5000Mtons. Based on a proven track record in delivering high capacity offshore cranes over the last decades, nowadays Huisman offers a range of Tub Mounted Cranes with lifting capacities up to 12,000mt. The tub mounted crane 1 is suitable to be used for transferring materials to and fro a quay, a marine vessel, a barge, a jacket, or another structure by elevating and rotating. The shown crane vessel 100 has a semi-submersible design which allows it to partially submerge in water. By pumping water in or out of ballast tanks, the crane vessel 100 can adjust its height in the water. This height adjustment capability serve to improve stability during heavy lifting operations. In an other embodiment, the crane vessel 100 may be a jack-up vessel. Such a jack-up vessel comprises a hull 101 with openings in the hull, wherein the openings extend vertically through the hull 101 to receive a respective jack-up leg. For each leg, a leg driving device may be provided to allow to move the corresponding leg up and down relative to the hull in a vertical _ 10 _ direction to allow the hull to be lifted out of a water body. The legs are retracted for sailing with the vessel. The top mounted crane 1 comprises a substructure formed by the tub 10 onto which a rotatable superstructure 11 is mounted. The superstructure is rotatable about a vertical axis 01. The superstructure 11 comprises operating machinery to carry out hoisting operations. The superstructure 11 comprises a crane house 2, a gantry 4 on top of the crane house and a boom 3 being pivotable about a horizontal boom pivot axis 03 at a proximal boom end portion 301. In particular, in such a heavy lifting crane vessel 100, the boom pivot axis 03 is positioned at a height level of at least 20m, in particular about 30m above a deck level DL. The boom may have a boom length of at least 80m. As shown in Fig. 5, the boom 3 ofthe crane 1 has a latticed structure. The boom comprises an A-frame with two boom legs that are connected at one end to the crane house 2 so as to be pivotal about the boom pivot axis 03 of a boom connector 22. The latticed boom legs may adjoin another in a box structure. The crane house 2 is rotatably connected to the tub 10 to allow a rotation of the superstructure 11 about a -practically seen- vertical axis 01. The crane house 2 is rotatably connected to the tub 10 for allowing a slew motion of the revolving superstructure 11 relative to the substructure. The crane house comprises a boom connector 22 which defines the horizontal boom pivot axis 03. The crane house 2 may include a cab where an operator manoeuvres the cranes controls. The crane comprises a boom hoist 30, which may also be called a luffing assembly. The boom hoist is arranged to set an angular orientation of the boom 3 relative to the crane house 2. The boom hoist 30 is configured to raise and lower the boom by pivoting the boom 3 about a boom angle about the boom pivot axis 03 defined by the boom connector 22. The boom hoist 30 comprises at least one boom hoist winch, also called a luffing winch 31. The luffing winch 31 is arranged to wind and unwind a luffing wire 32. The at least one luffing winch 31 is positioned at the crane house. Preferably, the at least one luffing winch 31 is positioned at the rear region at an upper region of the crane house 2. The luffing wire 32 is reeved along the gantry and extends in a multiple fall arrangements between a gantry apex and a distal end portion of the boom. The superstructure 11 comprises a hoisting system 7 for hoisting a hoist load by a load suspension device 8. Here, the load suspension device 8 includes a main load suspension _ 11 _ device 81 provided with a main hoisting wire 810, a multi sheave main block and a hook. Further, the load suspension device 8 includes an auxiliary load suspension device 82 and a whip line 83, also called a fast line. The auxiliary load suspension device 82 and the whip line 83 are connected to a jib 38 provided at a head structure 302 of the boom 3. The hoisting system 7 comprises at least one hoisting winch 70. The at least one hoisting winch 70 is positioned at the crane house 2. Here, a hoisting winch assembly 71 is provided including a plurality of hoisting winches 70. The hoisting winch assembly 71 is situated at the upper region of the crane house 2. Hoisting wires 701 extend from the hoisting winch assembly 71 to the head structure 302 of the boom, which is also shown in Fig. 11. In Fig. 1, the gantry, also called a luffing frame, is shown in a raised position RP. As shown in Fig. 2-4, the gantry 4 is collapsible from the raised position RP to a lowered position LP for reducing a total crane height during sailing of the vessel. The gantry 4 comprises a front framework 40 and a rear framework 41 which are each mounted on top of the crane house 2. The front framework 40 is positioned at a front region on top of the crane house 2. In the raised position RP, at their bases, the front framework 40 and the rear framework 41 are each connected to the crane house 2 by respectively a front and rear base mount 400, 410. The bases are connected by a pin-hole assembly. The front base mount 400 of the front framework 40 includes a base pivot 040 which defines a front pivot axis 040. The base pivot allows the front framework 40 to tilt in a vertical plane. The base pivot 040 allows a pivotal movement of the front framework40 relative to the crane house 2. Here, the base pivot 040 of the front framework is positioned above the boom pivot axis 03 of the boom connector 22. Here, the front base mount is integral with the boom connector 22. The base of the rearframework is connected to the crane house 2 by the rear base mount 410. The rear base mount410 is positioned at a rear region on top ofthe crane house 2. In particular, the rear base mount 410 is provided at the crane house deck 23. The rear base mount 401 of the rear framework is here formed a pin-hole assembly, see Fig. 6 and 7. The base of the rear framework has a through hole for receiving a pin. The pin-hole assembly has a seat 411, also called a base rest, at the crane house 2 for receiving the base of the rear framework. The seat has a seat hole 413 for receiving the pin to fixate the base of the rear framework to the seat. _ 12 _ Here, the seat 411 has at least one upstanding plate 412. Each plate 412 has a plate hole 413 for receiving the pin. The seat 411 is here formed by a left and right upstanding plate 412 which are each fixated to the crane house. Each plate 412 has a seat portion for supporting the base of the rear frame work. The base of the rear framework has a plate shaped end provided with a through hole. Here, the base of the rear framework has a fork end 414 including a left and right fork leg which are each provided with a fork end hole 415. In the pin-hole assembly, the fork end holes 415 are in alignment with the left and right upstanding plate holes 413. At an upper end, the front framework and rear framework 40, 41 are connected to each other by a top pivot 42 at a gantry apex 43. Herewith, seen in a side view, the gantry has an upside down V-shape in which the V-legs are formed by the front framework 40 and rear framework 41. As shown in detail in Fig. 2, according to an aspect of the invention, the superstructure of the tub mounted crane 1 further comprises a lowering mechanism 5 for lowering the gantry 4. The lowering mechanism 5 includes a link framework 50 and a lock system 51, see also Fig. 6, 7 and 8. The link framework 50 is arranged for displacing the rear framework 41 in downwards and upwards direction to respectively lower and raise the gantry. At one end, the link framework 50 is pivotally connected by a first link pivot 051 to the base of the rearframework of the gantry for displacing the base of the rearframework. At an opposite end, the link framework 50 is pivotally connected by a second link pivot 052 to the crane house 2. During a displacement, the link framework 50 provides a guidance to the base of the rear framework. By displacing the base of the rear framework, the gantry 4 can be lowered to reduce a total crane height. Seen from aside -in the side views of Fig. 2, 3 and 6- , the link framework 50 has an upside down L-shape. The link top 501 is provided with a first link pivot 051 at an end of a short leg of the L-shape. Here, as shown in Fig. 6, the first link pivot 051 is formed by a pin-hole coupling in which the hole has an oblong shape. The link base 501 is provided with a second link pivot 052 at an end of a long leg of the L-shape. The second link pivot 052 connects the link base 50 to the crane house 2. The second link pivot 052 has a horizontal pivot axis which allows the link framework 50 to rotate in a vertical plane with respect to the crane house 2. _ 13 _ The lock system 51 is arranged for locking the rear framework 41 in position when the gantry is in the raised position RP. The Iock system 51 includes at least one lock member 510 to lock or release the base ofthe rearframework 41, see also Fig. 7 and 8. In a locked state, the gantry 4 is fixed to the crane house 2. The fixation by the lock system 51 provides a solid and rigid connection of the gantry 4 to the crane house 2 which is required for hoisting operations. ln an unlocked state, the rear framework 41 of the gantry is displaceable which allows a lowering of the gantry 4. As shown in Fig. 3 and 4, the base of the rear framework is guided by the link framework 50 along a back side of the crane house. When lowering the base of the rear framework, the link framework 50 pivots about an angle of until about 180° along a back side of the crane house. ln Fig. 3, an initial displacement of the base of the rearframework41 to an intermediate position 41 at a back of the crane house is shown. In Fig. 4, a further lowering of the base of the rear framework is shown , wherein the link framework 50 finally abuts against the substructure, which is here the tub of the tub mounted crane. lnitially, in the raised position RP of the gantry, the link framework 50 is in an upright position. During lowering, the link framework 50 rotates in a direction away from the crane house 2 (backwards) as indicated by the references 42, 42 and 42". The link framework 50 rotates until the link top 501 abuts against an end stop 52. The end stop 52 is mounted at an outer side of a tub wall of the tub 10 for stopping the link framework 50. The tub wall may be provided with a reinforcement structure. After lowering the gantry 4, the link framework 50 has rotated about an angle of about 180°. As shown in Fig. 3 and 4 by the lowering of the gantry apex, a total crane height reduction is obtained. By using the link framework 50 for collapsing the gantry 4 of such a heavy lift crane 1 which might have a gantry height of for example about 90m from a water line WL, the gantry apex 43 can even be lowered about a distance of at least 20m. In particular, the gantry apex 43 can be lowered until a total crane height of at most 65m above a waterline to allow a crane vessel 100 to pass large bridges like the Great Belt Bridge of Denmark. Fig. 5 shows an enlarged view of the crane house 2 including a tugger winch 53 for tensioning the base of the rear framework by a tugger wire 530 during an operation of the lowering mechanism. Fig. 6 shows an enlarged view of the base portion of the rear framework 41 being _ 14 _ positioned in the seat 411 on top of the crane house 2, wherein the tugger wire 530 is fastened to the base of the rear framework. As shown in Fig. 4, a guide element for guiding the tugger wire is positioned at the crane house deck 23. The guide element is a guide roller 531. The guide roller is positioned at a rear edge region on top of the crane house for conducting the tugger wire across the crane house when the base of the rear framework is situated behind the crane house. ln a method for lowering a base of a rear framework, the tugger winch 53 is operated to exert a pull force when carrying out a displacement of the base of the rear framework 41 relative to the crane house 2. The tugger winch 53 is positioned at a front region of the crane house 2. The tugger winch 53 is positioned at the base of the front framework 40. A tugger wire 530 extends from the tugger winch 53 to the base of the rear framework 41. As shown in Fig. 6, an end of the tugger wire 530 is connected to the base of the rear framework 41. The tugger wire 530 extends along a tugger wire path which is determined by several tugger wire sheaves 531. In the illustrated embodiment, a tugger wire sheave 531 is connected to the boom 3 and another tugger wire sheave 531 is connected to the front framework 40, such that the tugger wire path extends from the tuggerwinch 53 via the boom 3 and the frontframework40 to the base ofthe rearframework 41. It is remarked that another tugger wire path is also conceivable. Fig. 6, 7 and 8 further show the locksystem 51 which is arranged for locking the rear framework 41 in position when the gantry 4 is in the raised position RP. The lock system 51 includes at least one lock member 510 to lock the base of the rear framework 41. The at least one lock member 51 fixates the base of the rear framework 41 to the crane house 2. The lock member 510 is formed by a pin which is receivable in the through hole at the base of the rear framework 41. The lock system 51 comprises a lock member actuator 511 for driving the lock member 510 into or out of the through hole for respectively locking or unlocking the base of the rear framework 41. Here, the lockmember actuator 511 is a hydraulic actuator. The hydraulic actuator may be self-sustained and being provided with a pump unit and a battery for incidentally actuating the lock member 510. Fig. 9 shows a head structure 302 of the boom 3 in further detail. The head structure includes a jib 38. The head structure 302 is arranged to carry a main load suspension device 81 which _ 15 _ is connected by a main hoisting wire 810 and provided with a multi-sheave main block and hook, an auxiliary load suspension device 82 and a whip line, also called a fast line 83. According to an aspect of the invention, Fig. 10 shows a vessel crane 1 in a side view. The vessel crane 1 is suitable to be installed on board of a crane vessel 100. The vessel crane 1 is mountable to a hull 101 of a vessel. Here, the vessel crane is a tub mounted crane, a so-called a TMC. The vessel crane 1 is arranged to transfer a hoist load from one to another position. The vessel crane 1 may transfer the hoist load to or from a marine vessel, a barge, a jacket or another structure. The vessel crane 1 comprises a substructure 10. Here, the substructure includes a pedestal, also called a tub. A superstructure 11 is mounted on top of the substructure 10. The superstructure includes operating machinery for carrying out a hoisting operation. The superstructure 11 comprises a crane house 2. The crane house is rotatably connected to the substructure to allow a slew motion of the superstructure relative to the substructure around a vertical axis 01. The crane house comprises a boom connector 22. The boom connector 22 defines a horizontal pivot axis for connecting a boom to the crane house. The superstructure 11 comprises a boom 3 for supporting a hoist load. The boom has a longitudinal axis which extends from a proximal end portion 301 of the boom to a distal end portion of the boom. The distal end portion of the boom is provided with a head structure 302. The boom is pivotally connected to the crane house 2 via the boom connector 22, so that the boom is pivotable about a boom pivot axis 03. The superstructure 11 comprises a gantry 4. The gantry 4 is a crane frame which is arranged to support the boom 3 of the vessel crane 1. The gantry 4 is mounted on the crane house 2. To reduce a total crane height during travelling of the crane vessel, the gantry 4 is collapsible from a raised position RP to a lowered position LP. The gantry 4 comprises a front framework 40 and a rear frame 41. In the raised position RP, the front framework 40 and the rear framework are at their bases mounted to the crane house 2. The gantry has a gantry apex 43. The gantry apex43 is formed by a connection ofa top of the front framework to a top of the rear framework. The front framework and the rear framework are connected to each other by a top pivot 42. _ 16 _ The superstructure 11 comprises a hoisting system 7 for hoisting the hoist load. The hoisting system 7 comprises at least one hoisting winch 70 which is provided with a hoisting wire 701. The hoisting wire extends from the hoisting winch 70 to the head structure 302 ofthe boom 3. Here, the head structure 302 includes a jib 38. The jib 38 is arranged to carry an auxiliary load suspension device 82 and a fast line. The superstructure 11 comprises a boom hoist 30 for raising and lowering the boom 3. The boom can be raised and lowered by pivoting the boom about the boom pivot axis 03 over a boom angle. The boom is depicted in fig. 10 in a substantially horizontal orientation in which the boom 3 is supported by a boom rest 39. The boom hoist 30 is provided with at least one boom hoist winch 31 for hauling in and paying out a luffing wire 32. By hauling in the luffing wire, the boom 3 can be raised and vice versa by paying out the luffing wire, the boom 3 can be lowered. Further, the boom hoist 30 comprises a boom suspension 6 for supporting the boom. The boom suspension 6 extends between the gantry apex 43 and the head structure 302 of the boom 3. The boom suspension contains the luffing wire which is configured in a multiple fall arrangement 60. The multiple fall arrangement 60 extends between a gantry sheave block 61 and a boom sheave block 62. The gantry sheave block 61 is positioned at a side of the gantry apex 43. The boom sheave block 62 is positioned at a side of the head structure 302 of the boom 3. The boom suspension 6 comprises an arrangement which enables a shortening of luffing wire in the multiple fall arrangement. The shortening of luffing wire 32 in the multiple fall arrangement allows to wind up a length of luffing wire onto the boom hoist winch 31 which length of luffing wire can subsequently be used for lowering the gantry 4. The boom suspension 6 comprises at least one detachable sheave block which allows an adaptation of the luffing wire length contained by the multiple fall arrangement 60. The luffing wire length can be adapted by displacing the at least one detachable sheave block away from a hoist position. The at least one detachable sheave block is in a hoist operational status of the vessel crane positioned in the hoist position. In the vessel crane design, the hoist position of the at least one detachable sheave block is determined for a heavy lifting hoisting operation in which heavy hoist loads are to be handled. The hoist position may represent a position ofthe at least one detachable sheave block in which a maximum hoist load can be lifted by the vessel crane. By moving the at least one detachable sheave block away from the hoist position, the luffing wire length in the multiple _ 17 _ fall arrangement can be shortened. During the displacement of the at least one detachable sheave block, a luffing wire may be wound onto the boom hoist winch. When a crane vessel 100 provided with the vessel crane 1 is travelling to another location, it may occur that the crane vessel has to pass a bridge with a maximum clearance height. In incidental cases, it may then be necessary to reduce a total crane height of the vessel crane 1 on board of the crane vessel 100. A total crane height can then be reduced by lowering the gantry 4. Depending on a particular vessel crane configuration, such a gantry 4 might be lowered in different ways. It may be possible by tilting the front framework 40 about a base pivot 040 and folding a rear framework in a backwards direction as disclosed in for example EP3.825.274 or as disclosed in for exampleWO2020 / 204719 by folding a rearframework in a fonNard direction. ln another method of lowering the gantry 4, the rear framework 41 may comprise an integral rigid body in which a base of the rear framework is to be demounted from a rear base mount 410 ofthe crane house 2 to be subsequently lowered at a back side of the crane house 2. Generally, the gantry 4 is lowered by tilting the front framework in a backwards direction about the base pivot 040. During a tilting motion of the front framework 40, the boom is maintained stationary. Preferably, the boom 3 remains on the boom rest 39 when tilting the front framework 40. After placing the boom 3 onto the boom rest 39, the boom suspension 6 can be slackened. To allow the front framework 40 to move away from the boom, the boom suspension 6 has to be lengthened. Thus, the tilting of the front framework 40 requires a lengthening of the boom suspension 6 which can be achieved by paying out luffing wire from the boom hoist which 31. As a consequence, the boom hoist Winch 30 may be configured to contain an additional length of luffing wire 32 to allow this tilting of the front framework 40. According to an aspect of the invention, an improvement is provided in that the gantry 4 can be lowered without a need for the predetermined additional length of luffing wire 32. In a vessel crane, the multiple fall arrangement of luffing wire 60 of the boom suspension 6 is determined to carry out a hoisting operation in which the boom 3 and a hoisting load are to be supported. ln comparison with hoisting, when lowering the gantry 4, the boom suspension 6 is subjected to lower forces. This allows the boom suspension 6 to be adapted to a less heavy configuration. The multiple fall arrangement 60 of the boom suspension 6 may contain a shorter length of luffing wire. An amount of falls of the luffing wire in the multiple fall arrangement of the boom suspension 6 may for example be reduced. _ 18 _ For adapting the multiple fall arrangement 60, according to the aspect of the invention, the multiple fall arrangement 60 of the boom suspension 6 comprises at least one detachable sheave block 63. At one side, at a side of the gantry 4, the multiple fall arrangement 60 has a gantry sheave block 61 and at an opposite side, at a side of the boom 3, the multiple fall arrangement 60 has a boom sheave block 62. The at least one detachable sheave block 63 is detachable from at least one of the gantry sheave block 61 and boom sheave block 62. Here, in Fig. 10, the at least one detachable sheave block 63 is in the hoist position connected to the boom sheave block 62. By detaching the at least one detachable sheave block 63 and moving the at least one detachable sheave block 63 away from its hoist position H, a length of luffing wire in the multiple fall arrangement is adapted. By moving the at least one detachable sheave block 63 away, the luffing wire 32 in the multiple fall arrangement is then shortened. During the movement, the luffing wire is wound onto the boom hoist Winch 31. After a predetermined displacement of the at least one detachable sheave block 63 in which the at least one detachable sheave block reaches a gantry tilt position GT, a sufficient length of luffing wire is wound onto the boom hoist winch 31 to allow a subsequent lowering of the gantry 4. Herewith, beneficially, the boom hoist winch 31 being configured for a hoisting operation needs no additional capacity to carry out an incidental operation in which the gantry 4 has to be lowered. Here, in Fig. 10, the at least one detachable sheave block 63 is transferable along a path between the boom sheave block 62 and the gantry sheave block 61. In the gantry tilt position GT, the at least one detachable sheave block is connectable to the gantry sheave block 61. It is conceivable that the at least one detachable sheave block 63 is transferable along an alternative path. The alternative path may extend along the boom. Preferably, the alternative path is a linear path which extends in a longitudinal direction defined by a longitudinal axis of the boom 3. In the gantry tilt position GT, the at least one detachable sheave block 63 may be connectable to the boom at a boom position at a distance from the boom sheave block 62. An auxiliary block 621 may be positioned at the boom position for connecting the at least one detachable sheave block 63. The at least one detachable sheave block 63 is transferable to and fro the boom sheave block 62 and the auxiliary block 621. The auxiliary block 621 may be positioned between the boom pivot axis 03 and the boom sheave block 62. The boom position for connecting the at least one detachable sheave block 63 may be located at the proximal end portion 301 of the boom. ln a variant, it is conceivable that in the gantry tilt position, the at least one detachable sheave block 63 is connectable to the crane house 2 or the gantry 4. In particular, the at least one detachable sheave block 63 may be connected to a base of a front framework 40 of the gantry 4. _ 19 _ In Fig. 10, the luffing wire 32 runs from sheaves 61 in the gantry 4 directly to sheaves 62 at the distal end portion 302 of the boom which is beneficial in that it puts a less dynamic loading into the sheaves. However, this so-called continuously reeved luffing wire requires a more lengthy wire in comparison with a boom suspension including a multiple fall arrangement 60 with an extension (69: not shown) as described above. The extension may be positioned between the gantry 4 and the multiple fall arrangement 60 or alternatively between the boom 3 and the multiple fall arrangement 60. As the luffing wire is a wearing component in hoisting operations, a wire replacement in a continuously reeved arrangement is more costly. Although, the aspect of the invention is illustrated by a continuously reeved luffing wire in Fig. 10, it is conceivable that the aspect of the invention is likewise applicable in case of a boom suspension including the extension. Fig. 11 and 12 show the multiple fall arrangement 60 of the boom suspension 6 in enlarged views. In the left-sided view of Fig. 11, a gantry sheave block 61 is positioned at the gantry apex 43. Here, in the gantry tilt position GT, a detachable sheave block 63 is connected to the gantry sheave block 61. In the right sided view of Fig. 11, a boom sheave block62 is positioned at a distal end portion 302 ofthe boom 3. Here, illustrated in the hoist position H, the detachable sheave block 63 is connected to the boom sheave block 62. To reduce an amount of falls of reeved luffing wire 32 in the multiple fall arrangement 60, the detachable sheave block 63 is transferred from the hoist position H at the boom 3 to the gantry tilt position GT at the gantry apex 43. The reduction of falls results in less luffing wire contained by boom suspension which becomes available to carry out a lowering of the gantry for to reduce a total crane height. As shown in Fig. 11, the detachable sheave block 63 is provided with a connector member 631 and the gantry sheave block 61 and the boom sheave block 62 are each provided with a complementary connector member 611, 621. Here, the detachable sheave block 63 is provided with a first connector member 631 at one side and a second connector member 632 at an opposite side for connecting the detachable sheave block 63 at opposite sides to an associate complementary connector member 611, 621. To obtain a proper alignment of a detachable sheave block 63 approaching one of the gantry sheave block 61 and boom sheave block 62, the detachable sheave block 63 has a sheave frame 630 which is provided with a positioning member 65. Preferably, the positioning member is one of a male and female member, wherein a complementary counterpart is provided at at least one of the gantry sheave block 61 and boom sheave block 62. In Fig. 10 and in the enlarged view of Fig. 13 a transfer winch 66 is shown which is configured to transfer a detachable sheave block 63. The transferwinch 66 is arranged to wind and unwind -zo- a transfer wire 660. The transfer winch 66 is positioned at the distal boom end portion 302. Here, the transfer winch 66 is positioned at the boom sheave block 62. The transfer wire 660 is connected to the detachable sheave block 63 to guide the sheave block 63 along the path from the hoist position H to the gantry tilt position GT. It is conceivable that in a variant, the transfer winch 66 is positioned at the gantry sheave block 61. By operating the transfer winch 66, the transfer wire can be paid out to lower the detachable sheave block 63 away from the gantry sheave block 61. Subsequently, the gantry sheave block 63 may be received and connected to the boom sheave block 62 or connected at another boom position which results in a shortening of luffing wire contained by the pump suspension 6. According to an aspect of the invention, in Figs. 14-23, a crane subassembly according to the invention is denoted overall by reference numeral 12. Identical reference signs are used in the drawings to indicate identical or functionally similar components. Fig. 14 shows an enlarged view of a crane, a so-called tub mounted crane TMC, having a crane house 2 being positioned on a substructure 10, a pedestal, a so-called crane tub, simply called a tub. The tub mounted crane is preferably configured to be installed on board of a vessel having a hull 101, e.g. a semi-submersible crane vessel, and a deck structure, a vessel deck 102, on which the crane according to an embodiment of the invention can be mounted. lt will be appreciated that the crane is of the same type as disclosed in WO2015 / 088332. The crane may also be connected to a ground surface GS, e.g. on a quay, for onshore operations. The crane is a slewing crane comprising a fixed substructure 10 and a rotatable superstructure 11. Here, the substructure is formed by the crane tub which is mounted to the deck structure 102. A slew bearing is arranged between the crane house 2 and the substructure 10 to allow slewing of the crane house relative to the substructure about a substantially vertical slewing axis, practically called a vertical axis. Preferably, the slew bearing is a roller slew bearing comprising raceways and a multitude of rollers arranged between said raceways and embodied to absorb vertical loads, radial loads, as well as tilting loads. The crane house 2 is configured to support a boom 3 at a front side of the crane house 2. Further, the crane house is configured to support a gantry 4, also called a luffing frame. Here, the gantry 4 is positioned on top of the crane house. Other arrangements of a mounting of a gantry to the crane house are also conceivable. A plurality of possible gantry arrangements is known from the prior art. _ 21 _ The crane house 2 may be embodied as disclosed in WO2018 / 143807. Fig. 15 and 16 show this known crane house in further detail. The crane house 2 has a substantially cylindrical shape. The crane house comprises a substantially cylinder-shaped circumferential wall 21 that is preferably made of steel. In this embodiment, the circumferential wall comprises a lower section 26, an upper section 27 and a middle section 25 in between the lower section and the upper section. These sections are integrated into one continuous wall 21 and here primarily serve as an indication ofa region of the circumferential wall. The lower section 26 is delimited by the circumferential stiffeners and a slew bearing flange at a lower end 211 of the wall. The slew bearing flange is embodied to connect the lower end of the wall to a slew roller bearing of substantially the same diameter. For example, a diameter of 15m or more. The illustrated embodiment, the diameter is about 30m. The upper section 27 is delimited by the circumferential stiffener and an upper end 212 of the wall, where a crane house deck 23 adjoins the upper end of the wall and partially closes off a top of the cylinder-shaped wall. The middle section 25 is here delimited by stiffeners on the inside of the wall 21. The stiffeners may be vertically spaced apart, and spaced from the neighbouring lower end 211 and upper end 212 of the wall 21 respectively. The circumferential stiffeners provide stiffness to the wall, distribute loads as they adjoin box element end portions of a base mount or a boom connector for respectively mounting the gantry or boom. The stiffeners may comprise oblique strengthening ribs, and assist to maintain the cylindrical shape of the structure of the crane house during operation. A boom connector 22 is connected to an upper section 27 of the wall for supporting the boom 3 of the crane at the front side of the crane house. The boom connector 22 defines a first horizontal pivot axis 03 for the boom to allow the boom to be pivoted up and down. In this embodiment, the crane house 2 is configured to support a gantry 4 having a gantry structure comprising an inclined front framework 40 which is at its lower end supported by a front gantry attachment structure, a front base mount 400, which is here incorporated with the boom connector 22, and a substantially vertical rear framework 41, also called a back stay member, supported by a rear gantry attachment structure, a rear base mount 410. _ 22 _ In an assembled state of the gantry 4, the front framework 40 and the rear framework 41 are pivotally connected to each other at the top. The connection of the front and rear framework at the top form a gantry apex 43. Although not illustrated in the drawings of WO2018 / 143807, the disclosed crane house is provided with a floor that at least partially closes off a bottom of the cylinder-shaped wall. In this prior art, this floor is used to support further equipment, e.g. electronic equipment, any winches, slew drive motors, of the crane inside the crane house. Fig. 17 shows a winch carrier 71 for carrying one or more winches. In particular, the winch carrier 71 is configured to carry a plurality of hosting winches 70. The winch carrier has a carrier body 710 which forms a platform 711. The platform 711 has a plurality ofwinch seats 712. Each winch seat 712 is configured to receive a winch. A winch can be mounted to the winch seat. Here, the winch seats 712 are positioned in an array. As shown in the top view of fig.18, the platform may provide multiple arrays, here two arrays ofwinch seats. As shown in fig. 18, the crane house deck 23 is open worked to allow wires originating from winches 31 ;70 below the crane house deck to pass along. Luffing wires 32 and hoisting wires 701 may pass through a crane house deck aperture to extend between a winch and the gantry apex 43. Fig. 19-21 show successive steps of an embodiment of an installation method for assembling a crane subassembly 12. Fig. 19 shows an assembly table 120 which is configured for installation of the winches onto the winch carrier 31. The assembly table has a table frame 121 which provides a predetermined table height. The table height is adapted to an associated built- in height of the winch carrier 31 being required for an associated crane house 2 to form the crane subassembly 12. The assembly table may include a plurality of crane house supports 122 forsupporting the crane house 3 relative to a winch carrier 31 being placed on the assembly table 121. Fig. 20 shows a step of an installation method wherein the winch carrier 31 is situated in an inner space of the crane house 2. In the step of the installation method, the crane house 2 is placed from above over the winch carrier. To allow the crane house to receive the winch carrier from below, the crane house has an open bottom. -23- The crane house 2 may have a ring-shaped crane house floor extending along the circumferential wall. The ring-shaped crane house floor provides an open mid area for receiving the winch carrier 31 inside the crane house 2. As shown in Fig. 20, the crane subassembly 12 comprises a plurality of carrier mounts 281, 781 for connecting the winch carrier 31 to the crane house 2. The carrier mounts 281 of the crane house are positioned at an inner side of the circumferential wall 21. In particular, the carrier mounts 281 are positioned at the middle section 25 of the circumferential wall. The carrier mounts 781 of the winch carrier 31 are situated at an outer contour. Preferably, a pair ofassociated carriermounts 281,781 comprise each a part ofa pin-hole assemblywhich allows the winch carrier 31 to be fastened to the crane house 2 by inserting a pin-shaped element into a hole of the carrier mounts. Fig. 21 shows a step of the installation method, wherein the crane house 2 together with the winch carrier 31 is placed on top of the substructure 10 ofthe crane. The crane house 2 is lifted from the assembly table 120 together with the winch carrier 31 and positioned on top of the substructure 10. After a positioning and alignment, the sub assembly of the crane house 2 and the winch carrier 31 is mounted to the substructure 10. Fig. 22 and 23 show an alternative embodiment of the installation method, wherein the winch carrier 31 is placed on the substructure before placing the crane house 2. Winches are preferably mounted to the winch carrier 31 in preparation of the placement ofthe winch carrier 31 onto the substructure. The winch carrier 31 is accurately positioned on the substructure by using a positioning frame being configured to correctly position the winch carrier 31 on the substructure 10. Subsequently, the crane house 2 is placed over the winch carrier 31 and the winch carrier 31 is mounted to the crane house 2. After mounting the winch carrier 31 to the crane house, the positioning frame may be removed. Although the present invention has been described in detail, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the invention as hereinafter claimed. It is intended that all such changes and modifications be encompassed within the scope of the present disclosure and claims. Further, it is remarked that any feature of the system according to the invention which is described in the embodiments and / or mentioned in the dependent claims is in itself considered patentable without any dependency to another presented feature. In particular, any measure _ 24 _ presented in a dependent claim is also considered patentable without dependency of the independent claim. Reference signs list: TMC tub mounted crane 27 upper section DL deck level 28 inner space WL water line 281 carrier mount RP raised position 3 boom LP lowered position 03 boom pivot axis 301 proximal boom end portion H hoist position (of sheave) 302 distal boom end portion; head structure GT gantry tilt position (of sheave) 30 boom hoist; luffing assembly 31 boom hoist Winch; luffing winch GS ground surface 32 luffing wire (6boom suspension) 1 tub mounted crane 01 vertical axis 38jib 100 crane vessel 39 boom rest 101 hull 102 vessel deck 4 gantry; luffing frame; A-frame 10 tub; pedestal; substructure 40 front framework 11 superstructure 400 front base mount 12 crane subassembly 040 base pivot 120 assembly table 41 rear framework 121 table frame 410 rear base mount 122 crane house support 411 seat 412 upstanding plate 2 crane house 413 seat hole; plate hole 21 circumferential wall 414 fork end 211 lower end 415 fork end hole 22 boom connector 42 top pivot 23 crane house deck 43 gantry apex 212 upper end 25 middle section 5 lowering mechanism 26 lower section 50 link framework -25- 501 link top 631 connector member 051 first link pivot 632 second connector member 502 link base 64 auxiliary block 052 second link pivot 65 positioning member 66 transfer winch 51 lock system 660 transfer wire 510 lock member 69: extension (not shown) 511 lock member actuator 7 hoisting system 52 end stop 70 hoisting winch 53 tugger winch 31, 70 lufng winch, hoisting winch 530 tugger wire 701 hoisting wire 531 guide roller; tugger wire sheave 71 winch carrier 710 carrier body 6 boom suspension 711 platform 60 multiple fall arrangement 712 winch seat 61 gantry sheave block 781 complementary carrier mount 610 gantry sheave frame 611 complimentary connector member 8 load suspension device 62 boom sheave block 81 main load suspension device 620 boom sheave frame 810 main hoisting wire 621 complimentary connector member 811 multi sheave main block (and hook) 63 detachable sheave block 82 auxiliary load suspension device 630 sheave frame 83 whip line; fast line CONCLUSION 1. Valve subassembly (12) for installing a tubular valve (TMC), where the crane sub-assembly comprises: - a crane house (2), where the crane house has a perimeter wall (21) that has an inner defines located space, where the perimeter wall (21) has a lower part (26) that is bounded by a lower end of the wall (211), where the lower end (211) is designed to be mounted on a swivel bearing and an upper part (27) that is bounded by an upper end (212) of the perimeter wall (21), where the crane house a boom connector (22) has in an upper area of the crane house for the attaching a boom (3) to the crane housing and at least one base attachment point (400, 410) for attaching a gantry (4) to the crane house; and - a winch carrier (71) with a support body (710) that in particular a platform (711) includes for carrying multiple winches (31, 70), where the carrying body (710) is equipped with multiple winch seats (712) to each receive a winch (31, 70), where the crane housing (2) comprises a multitude of support attachment points (281) and where the lyre carrier (71) a corresponding multitude of complementary includes carrier attachment points (781) to attach the winch carrier to the crane housing. 2. Crane subassembly (12) according to claim 1, where at least one of the multiple of carrier fastenings (281) and complementary carrier fastenings (781) provides a pin- hole assembly for attaching the winch carrier (71) to the crane housing (2) by the insertion of a pin-shaped element. 3. Crane subassembly (12) according to claim 1 or 2, where the multiple of carrier- fastenings (281) are placed on the inside of the perimeter wall (21), in the particularly in a middle section (25) of the perimeter wall (21), where the middle section is equipped with reinforcements (250). 4. Crane subassembly (12) according to one of the preceding claims, where the platform (711) has a rectangular outer shape, where the complementary support fastenings (781) are provided along an outer edge area of the platform, in particular in each corner of the rectangular platform (711). 5. Crane subassembly (12) according to one of the preceding claims, where the multiple winch seats (712) are placed in an orderly arrangement, in particular the The platform is provided with at least two arranged arrangements of winch seats (721). 6. Crane subassembly (12) according to one of the preceding claims, where all hoisting winches (70) and in particular all winding winches (13) from the tub crane (1) to the winch carrier (71) are placed. 7. Crane subassembly (12) according to one of the preceding claims, where a rear located outside of the crane house (2) remains free of a winch assembly, a so-called winch backpack. 8. Crane subassembly (12) according to one of the preceding claims, where the crane- subassembly (12) further comprises an assembly table (120) which is set up to the winch carrier (71) to align with respect to the crane housing (2), where the assembly table (12) a table frame (121) has a predetermined table height that corresponds to an installation height of the winch carrier (71) relative to the crane housing (2). 9. Crane subassembly (12) according to claim 8, where at least one of the winch carriers (71) and the assembly table (120) includes at least one crane housing support (122) for the supporting the crane housing (2) in relation to the winch carrier (71) which is on the table frame (121) is placed, so that the installation height is determined by a multiple of crane housing supports (122). 10. Crane subassembly (12) according to claim 9, where at least one crane housing sub- support (122) is connected to the table frame (121) and / or the winch carrier (71). 11. Crane subassembly (12) according to claim 9, where at least one crane housing sub- support (122) is a separate article, in which the installation height is specified in particular with reference to a ground surface (GS). 12. Crane subassembly (12) according to one of the preceding claims, where the crane- house (2) has an open bottom. 13. Crane subassembly (12) according to claim 12, where the crane house is a crane house floor includes with an open central area for receiving the winch carrier (71) inside the crane house (2). 14. Crane subassembly (12) according to claim 13, where the winch carrier (71) in the middle area can be attached to the crane housing (2). 15. Crane subassembly (12) according to one of the preceding claims, where a crane house deck (23) has been opened up to pass wires coming from the winches under the crane house deck to be able to let through. 16. Tubular crane (TMC) for transferring a lifting load, where the ship crane a substructure (10) comprises a superstructure (11) with control equipment on which is mounted mounted, whereby the superstructure comprises: - a crane housing (2) that is rotatably connected to the substructure to a swiveling movement of the upper structure relative to the lower structure to a to enable vertical axis, where the crane housing includes a boom connector (22) that a horizontal boom pivot axis (03) defines for connecting a boom (3) to the crane house (2); - a boom (3) for carrying a lifting load, where the boom has a longitudinal axis which extends from a proximal end section (301) to a distal end section with a head construction (302), where the boom is hinged to the crane housing (2) via the boom connector (22) so that the boom pivots around a boom pivot axis (03); - a gantry (4) for supporting the boom (3), with the gantry attached to the crane house, - a hoisting system (7) for hoisting the load, where the hoisting system has at least a hoist winch (70) includes a corresponding hoist wire (701) extending from the hoist winch to the boom head structure (302); - and boom hoisting device (30) for lifting and lowering the boom (3) by turning the boom around the boom pivot axis (03) over a boom angle, whereby the boom hoisting device at at least one boom hoisting winch (31) includes, also called a winding winch, for hoisting and issuing a luff wire to raise or lower the boom respectively, and whereby the boom hoisting device includes a boom suspension (6) for supporting the boom, where the boom suspension extends between a top of the gantry, a so-called gantry top (43) and the boom head structure (302) (3), where the tub crane (TMC) comprises a crane sub-assembly (12) with a winch carrier (71) which is connected to the crane housing (2), where the winch carrier (71) has a supporting body (710) that includes a platform (711) for carrying multiple winches (31, 70), where the The support body (710) is equipped with multiple winch seats (712) to each hold a winch (31, 70) received, where the crane housing (2) has a multitude of support attachment points (281) includes and where the winch carrier (71) a corresponding multitude of complementary carrier attachment points (781) to attach the winch carrier to the crane housing. 17. Tub crane (TMC) according to claim 16, where the winch carrier (71) is detachable attached by means of a mechanical connection to the crane housing (2). 18. Assembly method for assembling a crane sub-assembly (12) on a understructure (10) of a crane, in particular a tubular crane (TMC), where use is made of a crane subassembly with a crane housing (2) and a winch carrier (71), in in particular a crane sub-assembly within the meaning of one of the preceding claims, where the the method includes the following steps: - placing the winch carrier (71) on an assembly table (120) for assembling several winches (31) on the winch carrier; - assembling multiple winches on the winch carrier, where each winch is attached to a lyre seat (712) of a support body (710); - installing a crane housing (2) above the winch carrier (71); - lowering the crane housing (2) relative to the winch carrier (71) to support fixings (281) on the inside of a perimeter wall (21) of the crane housing (2) to be level with corresponding complementary support fastenings (781) on the winch carrier; - connecting the support fastenings (281) of the crane housing to the winch carrier mountings (781) of the winch carrier. 19. Assembly method in accordance with claim 18, whereby the method further comprises a step with testing the functionality of each winch (31, 70) that is on the support body (710) mounted 20. Assembly method in accordance with claim 18 or 19, whereby the crane sub-assembly in a preparatory step at a distance from the substructure (10) is assembled prior to placing the crane sub-assembly (12) on the substructure (10) of a to assemble tubular valve (TMC). 21. Assembly method according to claim 18 or 19, whereby the crane sub-assembly (12) on the The substructure (10) of the tub crane is attached, with one step of the assembly method the winch carrier (71) is placed on the substructure and whereby in a next step of the assembly procedure the crane housing (2) above the substructure (10) is placed and lowered onto it. 22. Assembly method according to conclusion 21, where the assembly table (120) for the positioning of the winch carrier (71) relative to the substructure (10) is connected with the substructure (10).