Transverse moving launching method for super-long ship

Abstract

The invention discloses a transverse moving launching method for an ultra-long ship, belongs to the technical field of ship launching, and solves the problem that an existing ultra-long ship is prone to toppling during transverse moving. According to the method, an auxiliary transverse moving trolley with walking wheels capable of swinging in the transverse moving direction is arranged below the ultra-long part of the ship body, and the ship body is supported by the auxiliary transverse moving trolley and a transverse moving row to transversely move into a launching slide way at the same time. According to the transverse moving launching method for the super-long ship, the super-long ship can be stably and transversely moved to be launched, and the working efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of ship launching, and more particularly to a transverse launching method for an ultra-long ship. Background Art

[0002] During the construction of small and medium-sized ships, the mechanical longitudinal launching method is as follows: after the ship is built on the land slipway, it is moved longitudinally from the slipway to the transverse shifting row (or transverse shifting vehicle), and the transverse shifting row carries the entire ship transversely. After aligning it with the launching slide, the ship is launched along the launching slide with a certain slope.

[0003] When the weight and length of the ship being built are within the load range of the transverse row, the safety of such a transverse process is guaranteed. However, when the length of the ship being built exceeds the length of the transverse row by a large margin, such as exceeding 90% of the length of the transverse row, that is, when a 50-meter-long transverse row carries a 95-meter-long ship, the length of the part exceeding the transverse row is 45 meters. If the weight of the extra-long part is not supported, its center of gravity will produce a huge tipping moment, causing safety risks such as deformation, overload and even longitudinal tilt to the ship-lifting trolley at the end of the transverse row, as well as the end of the transverse row and the hull structure near the end of the transverse row. The usual practice is to carry out technical transformation and lengthen the transverse row, but it involves huge investment in equipment, infrastructure, land, and funds, and the continuity of production will be interrupted. The cost is too high, and sometimes orders have to be abandoned.

[0004] The applicant's prior application, with the patent technology of publication number: CN102730169B, discloses a ship launching and transverse shifting auxiliary device, including a ship lifting trolley and a trolley track, the ship lifting trolley is arranged on the trolley track, the ship lifting trolley is provided with a ship shifting track, one end of the ship shifting track is the river end A close to the river surface, and also includes an auxiliary transverse shifting track, a detachable movable track frame and a transverse shifting trolley, the detachable movable track frame is arranged beside the river end A of the ship shifting track, the auxiliary transverse shifting track is installed on the top of the detachable movable track frame, and the transverse shifting trolley is arranged on the auxiliary transverse shifting track. The present invention has a fast construction period, low labor intensity of construction, saves manpower and material resources, has good practicality and safety, is easy to disassemble and maintain, can effectively improve the launching capacity of the shipyard, and the length of the launched ship can be increased by 30 meters.

[0005] Although the existing ship launching lateral movement auxiliary device can move an extra-long ship sideways to the launching slide, in the actual lateral movement process, since the ultimate goal of the lateral movement is to align with the sloped launching slide, the stern gradually descends down the slope, and the hull is prone to heeling.

[0006] Therefore, it is urgent to develop and design a method for launching an ultra-long ship transversely to solve the above-mentioned technical problems. Summary of the invention

[0007] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. An object of the present invention is to provide a method for launching an extra-long ship laterally, which can smoothly launch the extra-long ship laterally and effectively improve work efficiency.

[0008] In order to achieve the above-mentioned purpose, the present invention provides a method for the transverse launch of an extra-long ship, which method is to set an auxiliary transverse trolley with running wheels that can swing along the transverse direction under the extra-long part of the hull, and use the auxiliary transverse trolley and the transverse row to simultaneously support the hull to move transversely to the launching slide.

[0009] As a further improvement, the method comprises the following steps:

[0010] S1: An auxiliary transverse movement trolley is installed on the auxiliary transverse movement track below the extra-long part of the hull to support the extra-long part of the hull, and a boat lifting trolley is installed on the corresponding launching slide at the end of the auxiliary transverse movement track;

[0011] S2: Connect the lateral traction rope of the lateral winch to the lateral row and the auxiliary lateral trolley at the same time;

[0012] S3: Start the transverse winch to drive the transverse row, the hull and the auxiliary transverse trolley to move transversely to the side of the water slide at the same time, until the hull moves transversely to the water slide and the auxiliary transverse trolley moves transversely to the boat lifting trolley;

[0013] S4: The auxiliary lateral movement trolley is fixedly connected to the boat lifting trolley, the launching traction rope of the launching winch is connected to the hull and the boat lifting trolley at the same time, and the lateral movement traction rope of the auxiliary lateral movement trolley is loosened;

[0014] S5: Start the launching winch, slowly loosen the launching traction rope of the launching winch, and the hull and the boat-lifting trolley slowly slide down the launching slideway under the action of their own gravity until the boat-lifting trolley contacts the water surface of the river;

[0015] S6: Release the launching traction rope of the hull, and the hull falls into the river channel, completing the lateral launching of the extra-long hull.

[0016] Furthermore, the step S1 includes the following specific steps:

[0017] S1.1: Install auxiliary traverse rails on the ground on one side of the traverse row;

[0018] S1.2: After the hull is hoisted on the transverse row, an auxiliary transverse trolley is installed on the auxiliary transverse track under the extra-long part of the hull;

[0019] S1.3: Place multiple pads on the top of the auxiliary traverse trolley in sequence until the pads are in contact with the bottom surface of the hull to support the extra-long part of the hull;

[0020] S1.4: Install a boat lift trolley on the launching slide corresponding to the end of the auxiliary traverse track.

[0021] Furthermore, the auxiliary transverse shifting trolley is installed at the center of gravity of the extra-long part of the hull.

[0022] Furthermore, the step S1.1 includes the following specific steps:

[0023] S1.1.1: Pre-embed steel plates on the ground on one side of the transverse row;

[0024] S1.1.2: Weld multiple T-shaped rails parallel to the transverse row on the top of the steel plate;

[0025] S1.1.3: Place two auxiliary traverse rails on top of multiple T-shaped rails, and weld connecting plates on both sides of the auxiliary traverse rails corresponding to each T-shaped rail;

[0026] S1.1.4: Place two movable locking nuts in each T-shaped rail, move the locking nuts to the corresponding positions of the connecting plate, and then use fastening bolts to pass through the connecting plate and connect them to the locking nuts to complete the installation of the auxiliary traverse track.

[0027] Furthermore, in the step S1.3, the pad in contact with the hull is a conical plate, and after the conical plate contacts the bottom surface of the hull, the conical plate is impacted by an external force so that the conical plate is embedded between the lower pad and the bottom surface of the hull.

[0028] Furthermore, the step S3 includes the following specific steps:

[0029] S3.1: Start the transverse winch to drive the transverse row, hull and auxiliary transverse trolley to move 2-3m to the side of the lower water slide at the same time, close the transverse winch and stop the transverse movement;

[0030] S3.2: Detect the axis deviation and transverse level of the hull, and compare the detected values ​​with the range values ​​of the axis deviation and transverse level of the hull transverse movement. If the detected values ​​are both within the range values, proceed to the next step. If the detected values ​​are not within the range values, adjust them before proceeding to the next step.

[0031] S3.3: Repeat steps S3.1 and S3.2 until the hull is transversely moved to the launching slide and the auxiliary transverse movement trolley is transversely moved to the boat lifting trolley.

[0032] Furthermore, in the step S3.2, the axis deviation and lateral levelness of the hull are detected by a level measuring instrument.

[0033] Furthermore, in the step S4, the auxiliary transverse shifting trolley and the boat lifting trolley are connected by bolt fastening or latching.

[0034] Furthermore, the auxiliary transverse movement trolley includes a support frame and a plurality of wheels, each of the wheels is hingedly mounted on the bottom of the support frame, and the number of wheels on one side of the support frame is greater than the number of wheels on the other side. In the step S1, when the auxiliary transverse movement trolley is installed on the auxiliary transverse movement track under the extra-long part of the hull, the side of the support frame with more wheels is placed toward the side of the water slide.

[0035] Beneficial Effects

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] 1. The method for launching an extra-long ship transversely of the present invention adopts an auxiliary transverse shifting trolley with wheels that can swing in the transverse shifting direction to support the extra-long part of the hull, and cooperates with the transverse shifting row to transversely shift the hull to the launching slide. During the transverse shifting process, when it moves transversely to the inclined auxiliary transverse shifting track, the wheels swing relative to the top of the auxiliary transverse shifting trolley to keep the auxiliary transverse shifting trolley deck horizontally moving in the transverse shifting direction, thereby keeping the hull horizontal, and the extra-long ship can be smoothly launched transversely, effectively improving work efficiency.

[0038] 2. The method for launching an extra-long ship transversely of the present invention installs the track body by arranging a T-shaped steel rail on one side of the transverse row. In actual use, the position of the track body can be adjusted by loosening the fastening bolts so that the track body is located below the center of gravity of the extra-long part of the hull, thereby allowing the auxiliary transverse trolley to be more accurately supported at the center of gravity of the extra-long part of the hull, thereby being able to effectively support the extra-long parts of the hull of different lengths, having a wider range of applications, and making the force on the hull more even, effectively protecting the hull while greatly improving the transverse stability of the hull. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the transverse launching arrangement of an ultra-long ship of the present invention;

[0040] Figure 2 It is a schematic diagram of the cross-sectional structure of the hull before transverse movement in the present invention;

[0041] Figure 3 It is a schematic diagram of the cross-sectional structure of the hull after transverse displacement in the present invention;

[0042] Figure 4 for Figure 3 A schematic diagram of the structure enlargement at the center A;

[0043] Figure 5 It is a schematic cross-sectional view of the installation structure of the auxiliary lateral movement track in the present invention;

[0044] Figure 6 It is an enlarged schematic diagram of the main structure of the auxiliary transverse shifting trolley in the present invention;

[0045] Figure 7 It is an enlarged schematic diagram of the left side structure of the auxiliary transverse shifting trolley in the present invention;

[0046] Figure 8 It is an enlarged schematic diagram of the right side structure of the auxiliary transverse shifting trolley in the present invention;

[0047] Fig. 9 It is an enlarged schematic diagram of the top view of the auxiliary transverse shifting trolley in the present invention.

[0048] Among them: 1-hull, 2-walking wheels, 3-auxiliary transverse movement trolley, 4-transverse movement row, 5-launching slide, 6-auxiliary transverse movement track, 7-ship lifting trolley, 8-pad, 9-steel plate, 10-T-shaped rail, 11-connecting plate, 12-locking nut, 13-fastening bolt, 14-support frame, 15-concrete. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0050] See also Figure 1-9 A method for launching an extra-long ship transversely is provided, wherein an auxiliary transverse trolley 3 with running wheels 2 that can swing along the transverse direction is arranged under the extra-long part of the hull 1, and the auxiliary transverse trolley 3 and the transverse row 4 are used to simultaneously support the hull 1 to move transversely to the launching slide 5.

[0051] Specifically, the method comprises the following steps:

[0052] S1: Install an auxiliary transverse movement trolley 3 on the auxiliary transverse movement track 6 below the extra-long portion of the hull 1 to support the extra-long portion of the hull 1, and install a boat lifting trolley 7 on the launching slide 5 corresponding to the end of the auxiliary transverse movement track 6;

[0053] S2: Connect the transverse traction rope of the transverse hoist with the transverse row 4 and the auxiliary transverse trolley 3 at the same time. There are two transverse hoists, one for traction and the other for tensioning. After the traction rope of the transverse hoist for traction is connected with the transverse row 4 and the auxiliary transverse trolley 3, the pull rope of the other transverse hoist for tensioning is also connected with the transverse row 4 and the auxiliary transverse trolley 3;

[0054] S3: Start the transverse winch (tighten the traction rope of the transverse winch for traction and loosen the pull rope of the transverse winch for tension), drive the transverse row 4, the hull 1, and the auxiliary transverse trolley 3 to move transversely to the side of the water slide 5 at the same time, until the hull 1 moves transversely to the water slide 5 and the auxiliary transverse trolley 3 moves transversely to the boat lifting trolley 7;

[0055] S4: The auxiliary lateral movement trolley 3 is fixedly connected with the boat lifting trolley 7, and the launching traction rope of the launching winch is connected to the hull 1 and the boat lifting trolley 7 at the same time (the boat lifting trolley 7 on the lateral movement row 4 is also connected to the launching traction rope at the same time), and the lateral movement traction rope of the auxiliary lateral movement trolley 3 is loosened (the lateral movement winch pull rope is also loosened);

[0056] S5: Start the launching winch, slowly loosen the launching traction rope of the launching winch, and the hull 1 and the boat-lifting trolley 7 slowly slide down the launching slideway 5 under the action of their own gravity (if they cannot slide, they can be pushed by a locomotive), until the boat-lifting trolley 7 contacts the water surface of the river;

[0057] S6: The launching traction rope of the hull 1 is released, and the hull 1 falls into the river channel, completing the lateral launching of the extra-long hull.

[0058] The method for launching an extra-long ship transversely adopts an auxiliary transverse trolley 3 with running wheels 2 that can swing in the transverse direction to support the extra-long part of the hull 1, and cooperates with the transverse row to move the hull 1 transversely to the launching slide 5. During the transverse movement, when it moves transversely to the inclined auxiliary transverse track 6, the running wheels 2 swing relative to the top of the auxiliary transverse trolley 3 to keep the auxiliary transverse trolley 3 horizontally moving in the transverse direction, so that the hull 1 remains horizontal, and the extra-long ship can be smoothly launched transversely, effectively improving work efficiency.

[0059] Preferably, step S1 includes the following specific steps:

[0060] S1.1: Install an auxiliary traverse track 6 on the ground on one side of the traverse row 4;

[0061] S1.2: After the hull 1 is hoisted on the transverse row 4, the auxiliary transverse trolley 3 is installed on the auxiliary transverse track 6 below the extra-long portion of the hull 1;

[0062] S1.3: Multiple pads 8 are placed on the top of the auxiliary transverse trolley 3 in sequence until the pads 8 are in contact with the bottom surface of the hull 1 to support the extra-long portion of the hull 1. The pads 8 are in contact with the hull 1 to support the auxiliary transverse trolley 3, which not only facilitates the installation of the auxiliary transverse trolley 3 under the extra-long portion of the hull 1, but also enables the auxiliary transverse trolley 3 to better support the hull 1;

[0063] S1.4: Install a boat-lifting trolley 7 on the launching slide 5 corresponding to the end of the auxiliary transverse movement track 6, and use the boat-lifting trolley 7 to support the auxiliary transverse movement trolley 3 to change the moving direction, so that the transverse movement and launching of the hull 1 are smoother.

[0064] Preferably, the auxiliary transverse movement trolley 3 is installed at the center of gravity of the extra-long part of the hull 1, so that the force on the hull 1 is more evenly distributed, which effectively protects the hull 1 and greatly improves the transverse movement stability of the hull.

[0065] Preferably, step S1.1 includes the following specific steps:

[0066] S1.1.1: Pre-embed a steel plate 9 on the ground on one side of the transverse row 4;

[0067] S1.1.2: Weld a plurality of T-shaped steel rails 10 parallel to the transverse row 4 on the top of the steel plate 9;

[0068] S1.1.3: Place two auxiliary transverse tracks 6 on top of the plurality of T-shaped rails 10, and weld connecting plates 11 on both sides of the auxiliary transverse tracks 6 corresponding to each T-shaped rail 10;

[0069] S1.1.4: Two movable locking nuts 12 are placed in each T-shaped rail 10, and the locking nuts 12 are moved to the corresponding positions of the connecting plate 11, and then the fastening bolts 13 are passed through the connecting plate 11 and threadedly connected to the locking nuts 12 to complete the installation of the auxiliary transverse track 6.

[0070] In this embodiment, the auxiliary transverse track 6 is installed by setting a T-shaped steel rail 10 on one side of the transverse row 4. During actual use, the position of the auxiliary transverse track 6 can be adjusted by loosening the fastening bolts 13 so that the auxiliary transverse track 6 is located below the center of gravity of the extra-long part of the hull 1, thereby allowing the auxiliary transverse trolley 3 to be more accurately supported at the center of gravity of the extra-long part of the hull 1, thereby being able to effectively support the extra-long parts of the hull of different lengths, and having a wider range of applications.

[0071] Preferably, in step S1.3, the pad 8 in contact with the hull 1 is a conical plate, and after the conical plate contacts the bottom surface of the hull 1, the conical plate is hit by external force so that the conical plate is embedded between the lower pad 8 and the bottom surface of the hull 1, so that the auxiliary transverse movement vehicle 3 can better support the hull 1.

[0072] Preferably, step S3 includes the following specific steps:

[0073] S3.1: Start the transverse winch to drive the transverse row 4, the hull 1, and the auxiliary transverse trolley 3 to move 2-3 meters to the side of the lower water slide 5 at the same time, and then turn off the transverse winch to stop the transverse movement;

[0074] S3.2: Detect the axis deviation and transverse level of the hull 1, and compare the detected values ​​with the range values ​​of the axis deviation and transverse level of the transverse displacement of the hull 1 respectively. If the detected values ​​are both within the range values, proceed to the next step; if the detected values ​​are not within the range values, adjust them before proceeding to the next step;

[0075] S3.3: Repeat steps S3.1 and S3.2 until the hull 1 is transversely moved to the launching slide 5 and the auxiliary transverse movement trolley 3 is transversely moved to the boat lifting trolley 7.

[0076] In this embodiment, the hull 1 moves transversely in an intermittent transverse manner, which can detect whether the hull 1 is in a stable state, further improve the stability and safety of the transverse movement, and at the same time make it easier for the hull 1 to align with the launching slide.

[0077] Preferably, in step S3.2, the axis deviation and lateral levelness of the hull 1 are detected by a level meter, and the adjustment is made by adjusting the position or number of the transverse row 4 and the pad 8 to adjust the axis deviation and levelness of the hull 1.

[0078] Preferably, in step S4, the auxiliary transverse shifting trolley 3 and the boat lifting trolley 7 are connected by bolt fastening or latching, so that the auxiliary transverse shifting trolley 3 and the boat lifting trolley 7 are detachably connected to each other for easy reuse.

[0079] Preferably, the auxiliary lateral movement trolley 3 includes a support frame 14 and a plurality of running wheels 2, each running wheel 2 is hingedly mounted at the bottom of the support frame 14 to maintain the hull horizontally, and the number of running wheels 2 on one side of the support frame 14 is greater than the number of running wheels 2 on the other side. In step S1, when the auxiliary lateral movement trolley 3 is installed on the auxiliary lateral movement track 6 below the extra-long portion of the hull 1, the side of the support frame 14 with more running wheels 2 is placed toward the side of the water slide 5. Since the stern of the hull 1 tends to gradually descend during the lateral movement, the center of gravity of the hull 1 will be biased toward the side of the water slide 5. At this time, the number of running wheels 2 arranged toward the side of the water slide 5 is relatively large, which further improves the lateral movement stability.

[0080] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for launching an ultra-long ship transversely, characterized in that: The method comprises arranging an auxiliary transverse movement trolley (3) with running wheels (2) capable of swinging in a transverse movement direction under the extra-long portion of the hull (1), and using the auxiliary transverse movement trolley (3) and the transverse movement row (4) to simultaneously support the hull (1) to move transversely to a launching slideway (5).

2. The method for launching an ultra-long ship transversely according to claim 1, characterized in that: The method comprises the following steps: S1: Install an auxiliary transverse movement trolley (3) on the auxiliary transverse movement track (6) below the extra-long portion of the hull (1) to support the extra-long portion of the hull (1), and install a boat lifting trolley (7) on the launching slideway (5) corresponding to the end of the auxiliary transverse movement track (6); S2: Connect the transverse traction rope of the transverse winch to the transverse row (4) and the auxiliary transverse trolley (3) at the same time; S3: starting the transverse winch to drive the transverse row (4), the hull (1), and the auxiliary transverse trolley (3) to move transversely to one side of the water slide (5) at the same time, until the hull (1) moves transversely to the water slide (5) and the auxiliary transverse trolley (3) moves transversely to the boat lifting trolley (7); S4: The auxiliary transverse shifting trolley (3) and the boat lifting trolley (7) are fixedly connected together, the launching traction rope of the launching winch is connected to the hull (1) and the boat lifting trolley (7) at the same time, and the transverse shifting traction rope of the auxiliary transverse shifting trolley (3) is loosened; S5: starting the launching winch, slowly loosening the launching traction rope of the launching winch, and the hull (1) and the boat-lifting trolley (7) slowly slide down the launching slideway (5) under the action of their own gravity until the boat-lifting trolley (7) contacts the water surface of the river; S6: The launching traction rope of the hull (1) is released, and the hull (1) falls into the river channel, completing the lateral launching of the extra-long hull.

3. The method for launching an ultra-long ship transversely according to claim 2, characterized in that: The step S1 includes the following specific steps: S1.1: Install an auxiliary transverse track (6) on the ground at one side of the transverse row (4); S1.2: After the hull (1) is hoisted on the transverse row (4), an auxiliary transverse trolley (3) is installed on the auxiliary transverse track (6) below the extra-long portion of the hull (1); S1.3: placing a plurality of pads (8) on the top of the auxiliary transverse trolley (3) in sequence until the pads (8) are in contact with the bottom surface of the hull (1) to support the extra-long portion of the hull (1); S1.4: Install a boat-lifting trolley (7) on the launching slideway (5) corresponding to the end of the auxiliary transverse track (6).

4. The method for launching an ultra-long ship transversely according to claim 3, characterized in that: The auxiliary transverse shifting trolley (3) is installed at the center of gravity of the extra-long part of the hull (1).

5. The method for launching an ultra-long ship transversely according to claim 4, characterized in that: The step S1.1 includes the following specific steps: S1.1.1: Pre-embed a steel plate (9) on the ground on one side of the transverse row (4); S1.1.2: Weld a plurality of T-shaped steel rails (10) parallel to the transverse row (4) on the top of the steel plate (9); S1.1.3: Two auxiliary transverse tracks (6) are placed on top of the plurality of T-shaped steel rails (10), and connecting plates (11) are welded on both sides of the auxiliary transverse tracks (6) corresponding to each T-shaped steel rail (10); S1.1.4: Two movable locking nuts (12) are placed in each T-shaped rail (10), and the locking nuts (12) are moved to the corresponding positions of the connecting plate (11). Then, the fastening bolts (13) are passed through the connecting plate (11) and threadedly connected to the locking nuts (12), thereby completing the installation of the auxiliary transverse track (6).

6. The method for launching an ultra-long ship transversely according to claim 3, characterized in that: In the step S1.3, the pad (8) in contact with the hull (1) is a conical plate, and after the conical plate contacts the bottom surface of the hull (1), the conical plate is struck by an external force so that the conical plate is embedded between the lower pad (8) and the bottom surface of the hull (1).

7. The method for launching an ultra-long ship transversely according to claim 2, characterized in that: The step S3 comprises the following specific steps: S3.1: Start the transverse winch to drive the transverse row (4), the hull (1), and the auxiliary transverse trolley (3) to move 2-3 meters to one side of the lower water slide (5) at the same time, and then turn off the transverse winch to stop the transverse movement; S3.2: Detect the axis deviation and transverse levelness of the hull (1), and compare the detected values ​​with the range values ​​of the axis deviation and transverse levelness of the transverse movement of the hull (1). If the detected values ​​are both within the range values, proceed to the next step; if the detected values ​​are not within the range values, adjust them before proceeding to the next step; S3.3: Repeat steps S3.1 and S3.2 until the hull (1) is transversely moved to the launching slideway (5) and the auxiliary transverse movement trolley (3) is transversely moved to the boat lifting trolley (7).

8. The method for launching an ultra-long ship transversely according to claim 7, characterized in that: In the step S3.2, the axis deviation and the lateral levelness of the hull (1) are detected by a level measuring instrument.

9. The method for launching an ultra-long ship transversely according to claim 2, characterized in that: In the step S4, the auxiliary transverse shifting trolley (3) and the boat lifting trolley (7) are connected by bolt fastening or latching.

10. A method for launching an ultra-long ship transversely according to any one of claims 2 to 9, characterized in that: The auxiliary transverse shifting trolley (3) comprises a support frame (14) and a plurality of running wheels (2), each of the running wheels (2) being hingedly mounted at the bottom of the support frame (14), and the number of running wheels (2) on one side of the support frame (14) is greater than the number of running wheels (2) on the other side. In the step S1, when the auxiliary transverse shifting trolley (3) is installed on the auxiliary transverse shifting track (6) below the extra-long portion of the hull (1), the side of the support frame (14) with the greater number of running wheels (2) is placed toward the side of the water slide (5).

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