CN115973338A - Transfer process of rail type gantry crane - Google Patents

Transfer process of rail type gantry crane Download PDF

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Publication number
CN115973338A
CN115973338A CN202310045502.5A CN202310045502A CN115973338A CN 115973338 A CN115973338 A CN 115973338A CN 202310045502 A CN202310045502 A CN 202310045502A CN 115973338 A CN115973338 A CN 115973338A
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CN
China
Prior art keywords
crane
barge
track
rail
cross beam
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Pending
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CN202310045502.5A
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Chinese (zh)
Inventor
黄叶锋
陈喜
宋春年
汪小建
景晓燕
张帅
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Nantong Branch Of Shanghai Zhenhua Heavy Industry Group Co ltd
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Nantong Branch Of Shanghai Zhenhua Heavy Industry Group Co ltd
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Priority to CN202310045502.5A priority Critical patent/CN115973338A/en
Publication of CN115973338A publication Critical patent/CN115973338A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters

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Abstract

The invention relates to a transfer process of a rail type gantry crane, which comprises the following steps: step 1, berthing a barge, step 2, arranging barge rails, step 3, arranging ship loading rails, step 4, arranging ship unloading rails, step 5, loading and pulling, step 6, binding a complete machine, step 7, transferring the complete machine, and step 8, unloading and pulling; the crane moving tracks are laid on the wharf and the barge, the module vehicle and the jacking beam are used for driving the crane to move from the wharf to the barge along the tracks, the barge drives the crane to move to the target position on the wharf, and the module vehicle and the jacking beam are used for driving the crane to move from the barge to the target position on the wharf along the tracks, so that the whole crane is transferred, the process of dismantling and assembling is omitted, the operation is simple, the transfer efficiency is high, and the cost is low.

Description

Transfer process of rail type gantry crane
Technical Field
The invention relates to the technical field of transfer of gantry cranes, in particular to a transfer process of a rail type gantry crane.
Background
In recent years, with the high-speed development of the domestic shipbuilding industry, the domestic shipyard generally adopts an equipment matching mode that a shipbuilding gantry crane and a portal crane cooperatively operate in a shipway area so as to improve the production benefit of equipment. The portal crane is a cantilever crane with a bridge frame supported on a ground rail or a foundation through supporting legs at two sides, and is provided with a rail running along the ground, and the lower part of the portal crane can be driven by a vehicle to run along the rail to carry out hoisting, loading and unloading operation. At present, the track of current portal crane is mostly the double track mode that is parallel to each other, and the track is the straight line and extends, when portal crane need remove the operation position, because equipment is bulky, and weight is big, adopts earlier the complete machine to demolish, shifts in batches, the mode of reassembling shifts again usually, and whole transfer process is complicated loaded down with trivial details, shifts with high costs, and the operation is inconvenient.
Therefore, the invention provides a transfer process of a rail-mounted gantry crane, which solves the problems.
Disclosure of Invention
The invention aims to provide a transfer process of a rail type portal crane, which is simple in operation, high in transfer efficiency and low in cost.
In order to solve the technical problems, the technical scheme of the invention is as follows: a transfer process of a rail-mounted gantry crane is characterized by comprising the following innovation points: the method comprises the following steps:
step 1, berthing a barge, berthing the barge at a wharf where a crane is located, mooring the barge, and connecting a tugboat for protection;
step 2, laying barge rails, namely laying the barge rails on one side, close to a wharf, of a barge deck, and welding lifting lugs on the barge deck;
step 3, arranging the shipping tracks, namely paving the shipping tracks on one side, close to the barge, of the crane track on the wharf, connecting one side of the shipping tracks with the crane track, and placing a first water tank on one side, far away from the shipping tracks, of the crane track to serve as a ground anchor;
step 4, laying ship unloading rails, laying a new crane rail at the transfer target position on the wharf in advance, laying a ship unloading rail at one side of the new crane rail close to the wharf shore, connecting the ship unloading rail with the new crane rail, and placing a second water tank at one side of the new crane rail far away from the ship unloading rail as a ground anchor;
step 5, shipping and towing, namely installing a jacking beam on a crane, moving a module car in place, connecting the jacking beam with the module car, laying a first rigid beam to connect a shipping track with a barge track, connecting two sides of the crane with a first water tank and a lifting lug on the barge by using a safety steel wire rope and a towing steel wire rope respectively, removing the crane for anchoring, adjusting the barge draft to meet the shipping requirement, and driving the crane to move to the barge track along the crane track, the shipping track and the first rigid beam in sequence by the module car through the jacking beam;
step 6, binding the whole machine, removing the safety steel wire rope and the traction steel wire rope, connecting and fixing the crane with a barge deck by using four binding support rods, wherein the four binding support rods are distributed at four corners of the crane in a square shape, and two adjacent binding support rods are in an outer splayed shape;
step 7, transferring the whole machine, driving the barge to move by using a tugboat, and moving the crane to a wharf at a transfer target position along with the barge;
and 8, unloading and towing, laying a second rigid beam to connect the barge track with the unloading track, connecting the two sides of the crane with a second water tank and lifting lugs on the barge by using a towing steel wire rope and a safety steel wire rope respectively, driving the crane to move to a new crane track along the barge track, the second rigid beam and the unloading track in sequence by the module car through the jacking beam, installing the crane for anchoring, and dismantling the jacking beam, the towing steel wire rope and the safety steel wire rope.
Further, in the step 3, when the shipping tracks are laid, the equipment on the crane track on the wharf close to one side of the barge is removed in advance.
Further, the joints of each track of the barge track, the loading track and the unloading track are fixed by adopting horse plate welding.
Further, in step 5, during the ship loading and pulling process, the barge ballast needs to be adjusted to keep the deck of the barge flush with the wharf.
Further, in the step 6, when the crane needs to be parked on the barge for a long time, the crane arm support is placed on a jig frame preset on the barge deck in advance to be bound, and the contact position of the jig frame and the crane arm support is protected by a sleeper.
Furthermore, the jacking beam comprises a middle cross beam and two lateral cross beams arranged on two sides of the middle cross beam in parallel, the middle cross beam and the lateral cross beams are horizontally arranged, the lateral cross beams are arranged above the middle cross beam, and the lateral cross beams are respectively connected with the middle cross beam through connecting structures.
Further, connection structure is including erecting roof beam and two round pin axles, erect the vertical connection of roof beam and be close to one side bottom of middle cross beam at the side direction crossbeam to form L type structure with the side direction crossbeam cooperation, erect the draw-in groove that has joint middle cross beam on the roof beam bottom surface, the middle cross beam joint is in the draw-in groove, erect roof beam and middle cross beam cooperation and open and have two and supply the pivot separately male round pin shaft hole, two round pin axles are inserted respectively in the round pin shaft hole that corresponds, erect the roof beam and keep away from one side of middle cross beam and pass through the bracing and be connected with the side direction crossbeam.
Further, connection structure is including erecting the roof beam, transversely lifting joist and a plurality of bolt and nut subassembly, erect the vertical one side of connecting in the side direction crossbeam bottom near middle cross beam of roof beam, transversely lift joist horizontally and erect one side that the roof beam bottom is close to middle cross beam, transversely lift the joist, erect roof beam and side direction crossbeam cooperation and form Z type structure, middle cross beam sets up transversely lifting the joist top, middle cross beam's side and bottom are passed through the bolt and nut subassembly respectively with erect the roof beam and transversely lift the joist and be connected, erect the roof beam and keep away from one side of middle cross beam and pass through the bracing and be connected with side direction crossbeam.
Furthermore, connection structure is including erecting roof beam and a round pin axle, erect the vertical connection of roof beam and be close to one side bottom of middle cross beam at the side direction crossbeam to form L type structure with the cooperation of side direction crossbeam, it has the logical groove that supplies middle cross beam to pass to open on the perpendicular roof beam, and middle cross beam inserts and establishes in leading to the inslot, erects roof beam and middle cross beam cooperation and opens and to supply round pin axle hole that the pivot was male, and the round pin axle is inserted in the round pin axle hole.
The invention has the advantages that:
the crane moving tracks are laid on the wharf and the barge, the module vehicle and the jacking beam are used for driving the crane to move from the wharf to the barge along the tracks, the barge drives the crane to move to the target position on the wharf, and the module vehicle and the jacking beam are used for driving the crane to move from the barge to the target position on the wharf along the tracks, so that the whole crane is transferred, the process of dismantling and assembling is omitted, the operation is simple, the transfer efficiency is high, and the cost is low.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view illustrating the transfer of the rail-type portal crane according to the present invention.
Fig. 2 is a schematic view of the layout of the barge rails according to the present invention.
Fig. 3 is a schematic view of the connection of the barge rails to the barge deck according to the invention.
Fig. 4 is a schematic structural view of the ship loading traction of the invention.
Fig. 5 is an enlarged view of the invention at a.
Fig. 6 is an enlarged view of the present invention at B.
Fig. 7 is an enlarged view of the present invention at C.
Fig. 8 is a schematic diagram of the complete machine banding of the present invention.
Fig. 9 is a schematic view of the crane boom of the present invention resting on a gantry.
Fig. 10 is a partial enlarged view of the invention at point B.
Fig. 11 is a schematic view of a jacking beam of embodiment 1 of the present invention.
Fig. 12 is a schematic structural view of a middle cross member of embodiment 1 of the present invention.
Fig. 13 is a schematic structural view of a vertical beam of embodiment 1 of the present invention.
Fig. 14 is a schematic view of a jacking beam of embodiment 2 of the present invention.
Fig. 15 is a schematic view of a jacking beam of embodiment 3 of the present invention.
Fig. 16 is a schematic structural view of vertical beams and lateral beams of embodiment 3 of the present invention.
Detailed description of the preferred embodiments
The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Example 1
As shown in fig. 1-10, the transfer process of the rail-mounted gantry crane provided by the invention comprises the following steps:
step 1, berthing a barge, berthing the barge 1 at a wharf 2 where a crane is positioned, mooring the barge 1, and connecting a tugboat 3 for protection;
step 2, laying barge rails, namely laying barge rails 4 on the deck of the barge 1 at one side close to a wharf, welding and fixing each rail joint of the barge rails 4 by adopting a horse plate 5, laying steel plates 6 below the barge rails 4 for reinforcement, and welding lifting lugs 13 on the deck of the barge 1;
step 3, arranging the shipping tracks, wherein when the shipping tracks 7 are arranged, overhead cables, fire hydrants and car stop devices on the crane tracks on the wharf 2 close to one side of the barge 1 are removed in advance to prevent the laying of the shipping tracks 7 from being influenced, the shipping tracks 7 are laid on the crane tracks on the wharf 2 close to one side of the barge 1, one sides of the shipping tracks 7 are connected with the crane tracks, a first water tank 8 is placed on one sides of the crane tracks far away from the shipping tracks 7 to serve as ground anchors, and the joints of each track of the shipping tracks 7 are welded and fixed by adopting horse plates;
step 4, laying ship unloading rails, laying a new crane rail at the position of the transfer target position on the wharf in advance, laying a ship unloading rail 9 at one side of the new crane rail close to the wharf shore, connecting the ship unloading rail 9 with the new crane rail, placing a second water tank as a ground anchor at one side of the new crane rail far away from the ship unloading rail 9, and welding and fixing each rail joint of the ship unloading rail 9 by adopting a horse plate;
step 5, shipping and towing, wherein a jacking beam is installed on a crane, a module car moves in place, the jacking beam is connected with the module car, a first rigid beam 10 is laid to connect a shipping rail 7 with a barge rail 4, two sides of the crane are respectively connected with a first water tank 8 and a lifting lug 13 on the barge 1 through a safety steel wire rope 11 and a towing steel wire rope 12, two ends of the safety steel wire rope 11 are respectively provided with a four-door pulley 14, the safety steel wire rope is connected with an auxiliary steel wire rope 16 through a shackle 15, the auxiliary steel wire rope 16 is connected with the first water tank 8 through a shackle, the end part of the towing steel wire rope 12 is provided with the four-door pulley, the four-door pulleys are connected with the lifting lug 13 on the barge 1 through a shackle, the crane is removed for anchoring, the barge 1 is adjusted to have water to meet the shipping requirement, the module car drives the crane to sequentially move to the barge rail 4 along the crane rail, the shipping rail 7 and the first rigid beam 10 through the jacking beam, and the barge is adjusted to keep the deck of the barge 1 flush with the wharf 2 in the shipping and towing process;
and 6, binding the whole machine, dismantling the safety steel wire rope 11 and the traction steel wire rope 12, connecting and fixing the crane with a deck of the barge 1 by utilizing four binding support rods 17, wherein the four binding support rods 17 are distributed at four corners of the crane in a square shape, two adjacent binding support rods 17 are in an outer splayed shape, two ends of each binding support rod 17 are respectively welded with the crane and the deck of the barge 1, when the crane needs to be parked on the barge 1 for a long time, a crane arm frame is placed on a jig frame 18 preset on the deck of the barge 1 in advance for binding, and a contact part of the jig frame 18 and the crane arm frame is protected by a sleeper 19.
7, transferring the whole machine, driving the barge 1 to move by using the tug 3, and moving the crane to a wharf at a transfer target position along with the barge 1;
and 8, unloading and towing, laying a second rigid beam to connect the barge track 4 with the unloading track 9, connecting the two sides of the crane with a second water tank and lifting lugs on the barge by using a towing steel wire rope and a safety steel wire rope respectively, driving the crane to move to a new crane track along the barge track 4, the second rigid beam and the unloading track 9 in sequence by the module car through the jacking beam, installing the crane for anchoring, and dismantling the jacking beam, the towing steel wire rope and the safety steel wire rope.
The rail type portal crane transfer process comprises the steps of laying crane moving rails on a wharf and a barge, driving the crane to move from the wharf to the barge along the rails by using the module car and the jacking beam, driving the crane to transfer to a target position on the wharf by using the barge, and driving the crane to move from the barge to the target position on the wharf along the rails by using the module car and the jacking beam, so that the whole crane transfer is realized, the process of dismantling and assembling is omitted, the operation is simple, the transfer efficiency is high, and the cost is low.
The jacking beam 20 comprises a middle cross beam 201 and two lateral cross beams 202 arranged on two sides of the middle cross beam 201 in parallel, the module vehicle 21 is arranged below the lateral cross beam 202 on the same side, the middle cross beam 201 and the lateral cross beams 202 are both horizontally arranged, the lateral cross beams 202 are arranged above the middle cross beam 201, and the lateral cross beams 202 are respectively connected with the middle cross beam 201 through a connecting structure.
In this embodiment, as shown in fig. 11 to 13, the connection structure includes a vertical beam 203 and two pin shafts 204 located on the same horizontal plane, the vertical beam 203 is vertically connected to the bottom of one side of the lateral cross beam 202 close to the middle cross beam 201, and is matched with the lateral cross beam 202 to form an L-shaped structure, the side of the middle cross beam 201 has a protrusion for clamping, a clamping groove 2031 for clamping the protrusion of the middle cross beam 201 is formed on the bottom surface of the vertical beam 203, the protrusion of the middle cross beam 201 is clamped in the clamping groove 2031, the vertical beam 203 and the middle cross beam 201 are matched with two pin shaft holes for the respective insertion of the pin shafts 204, the two pin shafts 204 are respectively inserted into the corresponding pin shaft holes, one side of the vertical beam 203 far from the middle cross beam 201 is connected with the bottom surface of the lateral cross beam 202 through the inclined strut 205, the connection structure is simple in manufacturing process, and the jacking beam is convenient to install and operate.
Example 2
The transfer process of the rail-mounted gantry crane in embodiment 2 is the same as that in embodiment 1, as shown in fig. 14, the connection structure in embodiment 2 includes a vertical beam 203, a transverse lifting beam 207 and a plurality of bolt and nut assemblies 206, the vertical beam 203 is vertically connected to one side of the bottom of the lateral cross beam 202 close to the middle cross beam 201, the transverse lifting beam 207 is horizontally connected to one side of the bottom of the vertical beam 203 close to the middle cross beam 201, the transverse lifting beam 207, the vertical beam 203 and the lateral cross beam 202 cooperate to form a Z-shaped structure, the middle cross beam 201 is disposed above the transverse lifting beam 207, the side and the bottom of the middle cross beam 201 are respectively connected with the vertical beam 203 and the transverse lifting beam 207 through the bolt and nut assemblies 206, and one side of the vertical beam 203, which is far away from the middle cross beam 201, is connected with the bottom of the lateral cross beam 202 through the inclined strut 205. The connection structure of example 2 has higher connection strength and better stability than the connection structure of example 1.
Example 3
The transfer process of the rail-mounted gantry crane in embodiment 3 is the same as that in embodiment 1, as shown in fig. 15 to 16, the connection structure in embodiment 3 includes a vertical beam 203 and a pin 204, the vertical beam 203 is vertically connected to the bottom of one side of the lateral cross beam 202 close to the middle cross beam 201 and is matched with the lateral cross beam 202 to form an L-shaped structure, the vertical beam 203 is provided with a through groove 2021 for the middle cross beam to pass through, the middle cross beam 201 is inserted into the through groove 2021, the vertical beam 203 and the middle cross beam 201 are matched to be provided with a pin hole for the pin 204 to insert, and the pin 204 is inserted into the pin hole. Embodiment 3's connection structure relatively with embodiment 1 and embodiment 2, the installation is convenient and fast more, stable in structure, need not the bracing and strengthen fixedly, the consumptive material is few.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. A transfer process of a rail-mounted gantry crane is characterized in that: the method comprises the following steps:
step 1, berthing a barge, berthing the barge at a wharf where a crane is located, mooring the barge, and connecting a tugboat for protection;
step 2, laying barge rails, namely laying the barge rails on one side, close to a wharf, of a barge deck, and welding lifting lugs on the barge deck;
step 3, arranging the shipping tracks, namely paving the shipping tracks on one side, close to the barge, of the crane track on the wharf, connecting one side of the shipping tracks with the crane track, and placing a first water tank on one side, far away from the shipping tracks, of the crane track to serve as a ground anchor;
step 4, laying ship unloading rails, laying a new crane rail at the transfer target position on the wharf in advance, laying a ship unloading rail at one side of the new crane rail close to the wharf shore, connecting the ship unloading rail with the new crane rail, and placing a second water tank at one side of the new crane rail far away from the ship unloading rail as a ground anchor;
step 5, shipping and towing, wherein a jacking beam is installed on the crane, the module car moves in place, the jacking beam is connected with the module car, a first rigid beam is laid to connect the shipping track with the barge track, the two sides of the crane are respectively connected with the first water tank and a lifting lug on the barge by using a safety steel wire rope and a towing steel wire rope, the crane is removed for anchoring, the barge draft is adjusted to meet the shipping requirement, and the module car drives the crane to move to the barge track along the crane track, the shipping track and the first rigid beam in sequence through the jacking beam;
step 6, binding the whole machine, dismantling the safety steel wire rope and the traction steel wire rope, and connecting and fixing the crane with a barge deck by using four binding support rods, wherein the four binding support rods are distributed at four corners of the crane in a square shape, and two adjacent binding support rods are in an external splayed shape;
7, transferring the whole machine, driving the barge to move by using a tugboat, and moving the crane to a wharf of a transfer target position along with the barge;
and 8, unloading and towing, laying a second rigid beam to connect the barge track with the unloading track, connecting the two sides of the crane with a second water tank and lifting lugs on the barge by using a towing steel wire rope and a safety steel wire rope respectively, driving the crane to move to a new crane track along the barge track, the second rigid beam and the unloading track in sequence by the module car through the jacking beam, installing the crane for anchoring, and dismantling the jacking beam, the towing steel wire rope and the safety steel wire rope.
2. The rail-mounted gantry crane transfer process of claim 1, wherein: and 3, when the shipping tracks are laid, dismantling equipment on the crane track on the wharf close to one side of the barge in advance.
3. The rail-mounted gantry crane transfer process of claim 1, wherein: and the joint of each track of the barge track, the loading track and the unloading track is welded and fixed by adopting a horse plate.
4. The rail-mounted gantry crane transfer process of claim 1, wherein: in the step 5, during the ship loading and pulling process, the barge ballast needs to be adjusted to keep the deck of the barge flush with the wharf.
5. The rail-mounted gantry crane transfer process of claim 1, wherein: in the step 6, when the crane needs to be parked on the barge for a long time, the crane arm support is placed on a jig frame preset on a barge deck in advance to be bound, and a contact position of the jig frame and the crane arm support is protected by a bolster.
6. The rail-mounted gantry crane transfer process of claim 1, wherein: the jacking beam comprises a middle cross beam and two lateral cross beams arranged on two sides of the middle cross beam in parallel, the middle cross beam and the lateral cross beams are horizontally arranged, the lateral cross beams are arranged above the middle cross beam, and the lateral cross beams are respectively connected with the middle cross beam through connecting structures.
7. The rail-mounted portal crane transfer process of claim 6, wherein: the connecting structure comprises a vertical beam and two pin shafts, the vertical beam is connected to the bottom of one side, close to the middle cross beam, of the lateral cross beam, an L-shaped structure is formed by matching the lateral cross beam, a clamping groove for clamping the middle cross beam is formed in the bottom surface of the vertical beam, the middle cross beam is clamped in the clamping groove, the vertical beam and the middle cross beam are matched and provided with two pin shaft holes for inserting the pin shafts respectively, the two pin shafts are inserted into the corresponding pin shaft holes respectively, and one side, far away from the middle cross beam, of the vertical beam is connected with the lateral cross beam through an inclined strut.
8. The rail-mounted gantry crane transfer process of claim 6, wherein: connection structure is including erecting the roof beam, transversely lifting joist and a plurality of bolt and nut subassembly, erect the vertical one side of connecting in the side direction crossbeam bottom and being close to the intermediate transverse beam of roof beam, transversely lift joist horizontal connection in the one side of erecting the roof beam bottom and being close to the intermediate transverse beam, transversely lift the joist, erect roof beam and side direction crossbeam cooperation and form Z type structure, the intermediate transverse beam setting is in transversely lifting the joist top, the side and the bottom of intermediate transverse beam pass through the bolt and nut subassembly respectively with erect the roof beam and transversely lift the joist and be connected, the one side that the intermediate transverse beam was kept away from to the perpendicular roof beam is passed through the bracing and is connected with the side direction crossbeam.
9. The rail-mounted gantry crane transfer process of claim 6, wherein: the connecting structure comprises a vertical beam and a pin shaft, the vertical beam is connected to the bottom of one side, close to the middle cross beam, of the lateral cross beam and matched with the lateral cross beam to form an L-shaped structure, a through groove for the middle cross beam to penetrate through is formed in the vertical beam, the middle cross beam is inserted in the through groove, a pin shaft hole for inserting the pin shaft is formed in the vertical beam and the middle cross beam in a matched mode, and the pin shaft is inserted in the pin shaft hole.
CN202310045502.5A 2023-01-30 2023-01-30 Transfer process of rail type gantry crane Pending CN115973338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310045502.5A CN115973338A (en) 2023-01-30 2023-01-30 Transfer process of rail type gantry crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310045502.5A CN115973338A (en) 2023-01-30 2023-01-30 Transfer process of rail type gantry crane

Publications (1)

Publication Number Publication Date
CN115973338A true CN115973338A (en) 2023-04-18

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CN202310045502.5A Pending CN115973338A (en) 2023-01-30 2023-01-30 Transfer process of rail type gantry crane

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