Ship launching method

Abstract

The invention relates to a ship launching method, and belongs to the technical field of ship building and launching. The method comprises the steps that S1, the inclined shipway unit is divided into a plurality of first supporting areas and second supporting areas which are distributed in a staggered mode; s2, a coupling beam platform is arranged on at least one second supporting area, and supporting cross beams are arranged on the other first supporting areas; the two sides of the coupling beam platform extend outwards from the middle longitudinal buoyancy tank, the two ends of the coupling beam platform are in lap joint with the two inclined shipway units respectively, and the coupling beam platform, the supporting cross beam and the supporting face of the first supporting area are coplanar. S3, the longitudinal center line of the middle longitudinal buoyancy tank coincides with the connecting line of the center point of the coupling beam platform and the center point of the supporting cross beam; s4, launching the breeding work ship. According to the scheme, the matching performance of the inclined shipway unit and the bottom frame structure of the breeding work ship can be optimized, and the integrity of the ship body structure in the launching process is guaranteed by increasing the supporting contact area and reducing local stress concentration.

Description

Technical Field

[0001] The present application relates to the technical field of ship construction and launching, and in particular to a ship launching method. Background Art

[0002] As a new type of marine equipment, the 155-meter-long hull faced significant technical challenges during its launch. The hull's lattice-like layout, constructed using a sea-going frame structure, presented structural mismatches with conventional oblique gantry equipment. This resulted in the bottom's load-bearing surface being concentrated amidships. This structural misalignment easily led to localized stress concentration, threatening both the structural integrity of the hull and the safety of the vessel's launch. Summary of the Invention

[0003] In order to overcome the problems existing in the relevant technology, the present application provides a ship launching method, which can optimize the matching of the inclined ship frame unit and the bottom frame structure of the aquaculture vessel, increase the support contact area, reduce local stress concentration, and ensure the integrity of the hull structure during the launching process.

[0004] The present application provides a ship launching method, which is applied to a farming vessel with a column-stabilized box-type structure, comprising the following steps: S1. Divide the inclined gantry unit into a plurality of staggered first support areas and second support areas; S2. Arrange a connecting beam platform on at least one of the second support areas, and arrange supporting beams on the remaining first support areas; the second support area where the connecting beam platform is located includes two oblique gantry units, and two sides of the connecting beam platform extend outward from the central longitudinal pontoon, and the two ends are respectively overlapped with the two oblique gantry units, and the connecting beam platform and supporting beams are coplanar with the support surface of the first support area; S3, move the aquaculture vessel horizontally twice to above the inclined ship frame unit so that the longitudinal center line of the middle longitudinal pontoon coincides with the line connecting the center point of the connecting beam platform and the center point of the supporting beam; S4. Use a winch to pull the inclined aquaculture boat into the water.

[0005] In some embodiments, in S2, the connecting beam platform includes a platform beam, a first raising beam, and a second raising beam; the number of the platform beams is two, and they are spaced apart and arranged in parallel along the length direction of the oblique gantry unit; the number of the first raising beam and the second raising beam are both two, wherein the first raising beam is respectively padded on one platform beam, and the second raising beam is padded on the oblique gantry unit and located between the two platform beams, the first raising beam is used to support the transverse pontoon, and the second raising beam is used to support the middle longitudinal pontoon; The difference between the support surface height of the connecting beam platform and the support surface height of the supporting beam is compensated by the inclination angle of the inclined gantry unit so that the longitudinal center line of the middle longitudinal pontoon coincides with the line connecting the center point of the connecting beam platform and the center point of the supporting beam.

[0006] In some embodiments, in S2, the height of the connecting beam platform is 0.7 meters, and the height of the supporting beam is 0.8 meters.

[0007] In some embodiments, in S3, moving the aquaculture vessel to above the inclined gantry in two steps specifically includes: S31. Mark the side of the middle longitudinal pontoon facing the slipway, evenly load several hydraulic trolleys on the left longitudinal pontoon, the middle longitudinal pontoon, and the right longitudinal pontoon, and use the hydraulic trolleys to move the aquaculture vessel laterally until the mark is away from the edge of the slipway to a preset distance; S32. Unload the hydraulic trolleys located in the area of ​​the extended trestle of the inclined gantry, and continue to move the remaining hydraulic trolleys laterally until the longitudinal center line of the middle longitudinal pontoon coincides with the line connecting the center points of the connecting beam platform and the center points of the supporting beam.

[0008] In some embodiments, in S4, pulling the aquaculture vessel into the water by a winch specifically includes: S41. Pull the aquaculture boat by the winch to run at a first speed of 0.3 m / min for 30 minutes, then increase to a second speed of 0.6 m / min and run at a constant speed. During the operation, monitor the current value of the winch and adjust the force of each inclined ship frame unit until the launching operation is completed.

[0009] In some embodiments, in S41, monitoring the winch current value and adjusting the force of each inclined gantry unit during operation specifically includes: S411. Record the no-load current value of each hoist, add a tension sensor to the transmission end of each hoist, and collect the actual tension of each hoist in real time; S412, monitoring the current value of each hoist in real time, and calculating the current difference, where the current difference is the current value and the no-load current value; S413. Preset a target pulling force in the control room and compare the difference between the actual pulling force and the target pulling force; S414. Based on the linear relationship K between the current difference and the tension difference, adjust the output current of each winch until the deviation between the actual tension of all winches and the target tension is less than 2%.

[0010] In some embodiments, the method further comprises: S5. Set the maximum launching acceleration of the aquaculture vessel to 0.05 m / s², the gust coefficient to 1.5, and the safety factor to 2; collect the center of gravity height, windward area, and centroid height of the windward area of ​​the aquaculture vessel; Collect the historical maximum wind pressure in the area where the aquaculture vessel is launched; Calculating the capsizing moment of the aquaculture vessel based on the maximum launching acceleration, the center of gravity height, the windward area, the height of the centroid of the windward area, and the historical maximum wind pressure; Calculate the anti-overturning moment of the aquaculture vessel based on the maximum contact width between the supporting beam and the transverse pontoon; calculate the ratio of the anti-overturning moment to the overturning moment; If the ratio is greater than or equal to the safety factor, the design loads of the central longitudinal pontoon and the transverse pontoon are collected, and the actual loads of the central longitudinal pontoon and the transverse pontoon after the coupling platform and supporting beams are arranged are verified; If the actual load is greater than the design load, the number of coupling beam platforms is increased; If the actual load is less than the designed load, the aquaculture vessel carrying the aquaculture workers will be launched; If the ratio is less than the safety factor, the supporting beam and the connecting beam platform are extended so that the supporting beam and the connecting beam platform overlap the left longitudinal pontoon and the right longitudinal pontoon.

[0011] The technical solution provided by this application may have the following beneficial effects: The ship launching method provided in the present application divides the inclined ship frame unit into a first support area and a second support area that are staggered. The first support area is the original conventional inclined ship frame structure layout, and the second support area is arranged with a connecting beam platform and a supporting crossbeam to achieve the matching optimization between the inclined ship frame unit and the bottom frame structure of the aquaculture vessel, which not only increases the support contact area, but also reduces local stress concentration, thereby ensuring the integrity of the hull structure during the launching process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0013] Figure 1 Schematic diagram of the bottom frame structure of a farming vessel shown in an embodiment of the present application; Figure 2 1 is a schematic structural diagram of an oblique ship frame unit shown in an embodiment of the present application; Figure 3 Schematic diagram of the arrangement of the first support area and the second support area shown in an embodiment of the present application; Figure 4 This is a schematic diagram of the state of the inclined ship frame unit after the connecting beam platform and the supporting beam are arranged in the embodiment of the present application; Figure 5 Schematic diagram of the structure of the connecting beam platform shown in the embodiment of the present application; Figure 6 is another structural schematic diagram of the connecting beam platform shown in an embodiment of the present application; Figure 7This is a diagram of the launching state of the aquaculture vessel shown in an embodiment of the present application; Figure 8 This is another launching state diagram of the aquaculture vessel shown in an embodiment of the present application.

[0014] Reference numerals: 1. The first support area; 2. Second support area; 3. Connecting beam platform; 31. Platform beam; 32. First raising beam; 33. Second raising beam; 4. Support beams; 100. Aquaculture vessel; 101. Middle longitudinal pontoon; 102. Transverse pontoon; 200. Inclined gantry unit; 201. Inclined gantry unit. DETAILED DESCRIPTION

[0015] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0016] As an emerging industry equipment, aquaculture vessels 100 offer a variety of structural types, including column-stabilized / semi-submersible, frame-type, modular, ship-type, barge-type, bottom-sitting, jack-up, and jacket-type. The column-stabilized aquaculture vessel 100 features a sea-going frame structure on its bottom, consisting of a central longitudinal pontoon 101, left and right longitudinal pontoons, and transverse pontoons 102 arranged in a lattice pattern. While this structure offers enhanced aquaculture advantages, it also presents structural compatibility issues with traditional oblique rig systems. The main issue is that the load-bearing surface of the bottom is concentrated midship, which can easily lead to localized stress concentration, threatening the structural integrity of the hull and compromising launch safety.

[0017] To solve the above problems, the present application provides a ship launching method, which optimizes the matching of the inclined ship frame unit 200 and the bottom frame of the aquaculture vessel 100, increases the support contact area, reduces local stress concentration, and ensures the structural safety of the launching process.

[0018] Figure 1 1 is a structural diagram of the bottom frame structure of a breeding vessel 100 shown in an embodiment of the present application. Figure 2 Schematic diagram of the structure of the inclined ship frame unit 200 shown in an embodiment of the present application.

[0019] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0020] See also Figure 1The bottom frame structure of the aquaculture vessel 100 is composed of a left longitudinal pontoon, a middle longitudinal pontoon 101 and a right longitudinal pontoon that extend longitudinally and are arranged in parallel, as well as several groups of transverse pontoons 102 connecting the left longitudinal pontoon, the middle longitudinal pontoon 101 and the right longitudinal pontoon.

[0021] See also Figure 2 The inclined cradle assembly 200 is a specialized device used in shipbuilding to support the longitudinal and transverse movement of dismantling or newly constructed vessels between land-based slipways and waterways. The inclined cradle assembly 200 consists of several parallel inclined cradle units 201, spaced 7 to 9 meters apart. Each inclined cradle unit 201 slides on tracks to ensure safe vessel movement.

[0022] See also Figures 3 to 8 , the embodiment of the present application proposes a ship launching method, which specifically includes the following steps: S1. Divide the inclined gantry unit 200 into a plurality of first support areas 1 and second support areas 2 that are staggered.

[0023] S2. Arrange a connecting beam platform 3 on at least one second support area 2, and arrange supporting beams 4 on the remaining first support areas 1. The second support area 2 where the connecting beam platform 3 is located includes two oblique gantry units 201. The two sides of the connecting beam platform 3 extend outward from the central longitudinal pontoon 101, and the two ends are respectively connected to the two oblique gantry units 201. The connecting beam platform 3 and the supporting beams 4 are coplanar with the support surface of the first support area 1.

[0024] S3. Move the aquaculture vessel 100 transversely to above the inclined ship frame unit 200 in two steps, so that the longitudinal center line of the middle longitudinal pontoon 101 coincides with the line connecting the center points of the connecting beam platform 3 and the support beam 4.

[0025] S4. The aquaculture vessel 100 is launched into the water by means of a winch.

[0026] The aquaculture vessel 100 is arranged on the oblique gantry unit 200 along the direction in which the oblique gantry units 201 are arranged. Since the length of the oblique gantry unit 201 does not match the width of the aquaculture vessel 100, the left longitudinal pontoon and the right longitudinal pontoon cannot form effective contact with the oblique gantry unit 201, resulting in the aquaculture vessel 100 being at risk of capsizing or deformation when launched, which is not likely to happen to conventional ships. The present application divides the oblique gantry unit into a first support area and a second support area, wherein the oblique gantry units 201 of the first support area 1 carry the middle longitudinal pontoon 101, and the second support area 2 carries the middle longitudinal pontoon 101 and the transverse pontoon 102 at the same time. At the same time, the number of the second support areas 2 is related to the number of the transverse pontoons 102. The second support area 2 may include one or two oblique gantry units 201, and the adjacent second support area 2 is the first support area 1. During specific implementation, the number of second support areas and the corresponding number of oblique gantry units are first preliminarily determined based on the number of transverse pontoons of the aquaculture vessel 100. After determining the positional layout of the first support area 1 and the second support area 2, the actual contact area between the oblique gantry units 201 of the second support area 2 and the transverse gantry units 102 can be determined by using a drawing fitting and overlapping method. Since the oblique gantry unit 200 does not completely match the bottom structure of the aquaculture vessel 100, in addition to determining that one of the transverse gantry units 102 can be fully ballasted on the oblique gantry unit 201, the remaining transverse gantry units 102 may fall into the following three situations: the first is that they are fully ballasted on the corresponding oblique gantry unit 201; the second is that the transverse gantry units 102 partially ballast the oblique gantry units 201; and the third is that the transverse gantry units 102 have no contact with the oblique gantry units 201 at all. In a preferred embodiment, in order to balance the forces on the bow and stern of the ship, the transverse pontoon 102 in the middle of the aquaculture vessel 100 can be ballasted on the inclined frame unit 201 to arrange the connecting beam platform 3 and the supporting beam 4, thereby determining the force conditions of the transverse pontoon 102 and the middle longitudinal pontoon 101.

[0027] Specifically, the design loads of the central longitudinal pontoon 101 and transverse pontoon 102 are first collected, and the actual load is calculated based on the contact area between the transverse pontoon 102 and the central longitudinal pontoon and the oblique frame unit 201. The actual load is compared with the design load. If the actual load exceeds the design load, a connecting beam platform 3 is installed in the second support area 2 to evenly distribute the load. In other words, if the actual load on the transverse pontoon 102 exceeds the design load, the connecting beam platform 3 is installed in the second support area 2 where it is located.

[0028] The connecting beam platform 3 can be formed by welding a steel structure, and its length is adjusted according to the spacing between the inclined gantry units 201, and its width is determined according to the actual load of the transverse pontoon 102. The supporting crossbeam 4 can be an I-beam or box beam structure. When the aquaculture vessel 100 is located on the slipway, it is driven by a hydraulic trolley, and the ballasting of the aquaculture vessel 100 and the inclined gantry unit 200 are achieved through a track system. During the movement, a laser rangefinder can be used to monitor the position deviation in real time, and a tension sensor can be used to monitor the traction change in real time to ensure the force balance of each inclined gantry unit 201. The connecting beam platform 3 and the supporting crossbeam 4 are arranged in the second support area 2 to optimize the matching between the inclined gantry unit 200 and the bottom frame structure of the aquaculture vessel 100, which not only increases the support contact area, but also reduces local stress concentration, thereby ensuring the integrity of the hull structure during the launching process. This method effectively improves the force distribution of the hull, avoids local stress concentration, and ensures the structural safety of the launching process. This method is optimized for the special structure of the aquaculture vessel 100 and has better adaptability and reliability.

[0029] Furthermore, the connecting beam platform 3 includes a platform beam 31, a first raising beam 32, and a second raising beam 33; the number of the platform beams 31 is two, and they are arranged in parallel along the length direction of the oblique gantry unit 200; the number of the first raising beams 32 and the second raising beams 33 are both two, wherein the first raising beam 32 is padded on one platform beam 31 respectively, and the second raising beam 33 is padded on the oblique gantry unit 201 and located between the two platform beams 31, the first raising beam 32 is used to support the transverse pontoon 102, and the second raising beam 33 is used to support the middle longitudinal pontoon 101; The difference between the support surface height of the connecting beam platform 3 and the support surface height of the supporting beam 4 is compensated by the inclination angle of the inclined gantry unit 201 so that the longitudinal center line of the middle longitudinal pontoon 101 coincides with the line connecting the center points of the connecting beam platform 3 and the supporting beam 4.

[0030] Specifically, the platform beam 31 can be constructed of an I-beam or box beam structure, its length matching the spacing between the oblique gantry units 201, and its ends secured to the oblique gantry units 201 via high-strength bolts. The first and second gantry beams 32, 33 are rectangular steel beams. The first gantry beam 32 is used to distribute the concentrated load of the transverse pontoons 102, while the second gantry beam 33 is used to compensate for the impact, contacting the central longitudinal pontoons 101. The independent movement control of the oblique gantry units 201 is achieved through a PLC system. Each oblique gantry unit 201 is equipped with a displacement sensor and winch, automatically adjusting its tilt angle and horizontal position based on the centerline position of the central longitudinal pontoons 101. In some embodiments, a Hall sensor is embedded in the center point of the connecting beam platform 3 and the center point of the supporting beam 4, and a neodymium iron boron magnet is welded every 5 meters on the longitudinal center line of the middle longitudinal pontoon 101. The sensor sampling frequency is 10 Hz. The magnetic field induction is used to determine whether the longitudinal center line of the middle longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting beam 4. When the magnetic field signal deviation exceeds ±0.1 mT, an alarm is triggered, and the hull position is readjusted by a hydraulic trolley until the longitudinal center line of the middle longitudinal pontoon 101 coincides with the line connecting the center point of the connecting beam platform 3 and the center point of the supporting beam 4.

[0031] In this embodiment, the concentrated load of the bottom frame is dispersed to multiple inclined framing units 201, wherein the first raising beam 32 directly bears the vertical force of the transverse pontoon 102, the second raising beam 33 maintains the linear support of the middle longitudinal pontoon 101, and the platform beam 31 serves as a force-transmitting component to transfer the load to the inclined framing foundation, thereby solving the stress concentration problem caused by the alignment deviation between the sea-going frame structure and the inclined framing, and ensuring that the hull maintains uniform stress during the launching process.

[0032] Furthermore, the height of the connecting beam platform 3 is 0.7 meters, and the height of the supporting crossbeam 4 is 0.8 meters. The height of the connecting beam platform 3 is achieved by the combination of the platform beam 31, the first raising beam 32, and the second raising beam 33. For example, the bottom structure of the 155-meter aquaculture vessel 100 has two transverse pontoons 102 and a bow pontoon. The bow pontoon can be used as a transverse pontoon 102, and the interval between them is 40 meters. When there are three transverse pontoons 102, the connecting beam platform 3 is installed on the inclined frame units 201J17 and J18. The length and height dimensions of the platform beam 31 are 11m×3.6m×0.3m. The first raising beam 32 is laid on the platform beam 31. The first raising beam 32 is a combined I-beam with a length, width and height dimension of 3.6m×2m×0.4m. The second bolster beam 33 is 0.4m high, ensuring that the platform beam 31, first bolster beam 32, and second bolster beam 33 are aligned at the same level. Support beams 4 are installed on the oblique gantry units J22 and J28, with dimensions of 20m x 2m x 0.8m. The height difference between the connecting beam platform 3 and the supporting beam 4 is 0.1m. This difference is compensated for by adjusting the tilt angle of the oblique gantry unit 201, ensuring that the longitudinal centerline of the mid-longitudinal pontoon 101 coincides with the line connecting the center points of the connecting beam platform 3 and the supporting beam 4. This configuration solves the problem of excessively concentrated contact between the bottom frame structure and the oblique gantry unit 201, ensuring the stability of the hull during launching.

[0033] Furthermore, the aquaculture vessel 100 is moved transversely to the upper side of the inclined ship frame in two steps, specifically including: S31. Mark the side of the middle longitudinal pontoon 101 facing the slipway, evenly load several hydraulic trolleys on the left longitudinal pontoon, the middle longitudinal pontoon 101, and the right longitudinal pontoon, and use the hydraulic trolleys to move the aquaculture vessel 100 laterally until the mark is away from the edge of the slipway to a preset distance; S32, unloading the hydraulic trolleys located in the area of ​​the inclined gantry extension trestle, and the remaining hydraulic trolleys continue to move laterally until the longitudinal center line of the middle longitudinal pontoon 101 coincides with the line connecting the center points of the connecting beam platform 3 and the support beam 4.

[0034] Specifically, the markings can be reflective stickers or laser markers, with the preset distance determined based on the slipway width and the length of the extended trestle area of ​​the oblique gantry, for example, 1.5 to 2 meters. The hydraulic trolleys utilize a synchronized control system, with each set of hydraulic trolleys equipped with pressure sensors to monitor the load-bearing status of each point in real time. The extended trestle area of ​​the oblique gantry refers to the transition support zone extending from the oblique gantry unit 201 toward the slipway, and its length is no less than the width of the transverse pontoon 102. By unloading the hydraulic trolleys in stages and controlling their movement trajectory, localized stress concentrations can be avoided when the bottom frame contacts the oblique gantry. The initial lateral movement ensures the overall translation of the hull into the effective support range of the oblique gantry, while the secondary movement achieves precise positioning by reducing the number of support points. This solution addresses the difficulty in aligning the seagoing frame structure with the oblique gantry. By adjusting the distribution of support points in stages, the bottom load is evenly transferred to the oblique gantry unit 201. Compared to continuous movement, the phased operation allows for more precise control of the hull's posture and prevents deformation of the frame structure caused by asynchronous support at multiple points.

[0035] Furthermore, starting the inclined ship frame unit 200 to pull the aquaculture vessel 100 into the water specifically includes: S41. The aquaculture vessel 100 is pulled by a winch to run at a first speed of 0.3 m / min for 30 minutes, and then increased to a second speed of 0.6 m / min for uniform operation. During the operation, the current value of the winch is monitored and the force of each inclined ship frame unit 201 is adjusted until the launching operation is completed.

[0036] The first speed is set at 0.3 m / min for stable initial launch, preventing structural impact caused by sudden loading. During launching, if the real-time wind speed exceeds 1.2 times the historical maximum wind pressure, the speed is immediately reduced to 0.1 m / min, and temporary hull securing devices, such as hydraulic locking blocks installed at the ends of the oblique gantry unit 201, are activated. Operation is resumed after the wind speed decreases. By adopting a slow-to-fast speed control strategy, the vessel's status can be observed at a lower speed during the initial launch phase, allowing for timely identification and resolution of potential issues. Subsequently, the speed is gradually increased after safety is confirmed, ensuring both safety and improved launching efficiency. The winch current is monitored using Hall sensors, sampling at a 10 Hz frequency to collect the current of each phase of the three-phase motor. Force adjustment of the oblique gantry unit 201 is achieved via a PID controller. Through staged speed control and real-time force balance adjustment, the problem of localized overload caused by the concentrated contact between the seagoing frame hull and the oblique gantry is addressed.

[0037] Compared to existing technologies that use a constant launching speed, dynamic speed regulation distributes the hull load more evenly across each oblique gantry unit 201. This has been shown to reduce maximum contact pressure by 37%. A current monitoring and force feedback system controls force deviation within the oblique gantry unit 201 to within 2%, effectively preventing structural deformation. This solution is particularly suitable for aquaculture vessels 100 with lattice-structured bottoms, and its operability has been verified in applications involving 155-meter vessels.

[0038] Furthermore, monitoring the winch current value and adjusting the force of each inclined gantry unit 201 during operation specifically includes: S411. Record the no-load current value of each hoist, add a tension sensor to the transmission end of each hoist, and collect the actual tension of each hoist in real time; S412, monitoring the current value of each hoist in real time, and calculating the current difference, where the current difference is the current value and the no-load current value; S413. Preset a target pulling force in the control room and compare the difference between the actual pulling force and the target pulling force; S414. Based on the linear relationship K between the current difference and the tension difference, adjust the output current of each winch until the deviation between the actual tension of all winches and the target tension is less than 2%.

[0039] Specifically, the no-load current value is the current value measured when the winch is not carrying the load of the aquaculture vessel 100, which serves as a benchmark reference. The tension sensor is installed at the transmission end of the winch, and is used to measure the actual tension of the winch in real time. At the same time, since the inclined ship frame unit 201 of the second support area 2 needs to additionally carry the connecting beam platform 3 or the supporting beam 4, the corresponding tension output is relative to the first support area 1. The specific data can be determined based on the total weight of the connecting beam platform 3 and the supporting beam 4. The current current value is the current value monitored in real time during the operation of the winch. By calculating the difference with the no-load current value, the load change of the winch can be reflected. The target tension preset in the control room is an ideal tension value set according to the launching requirements and safety requirements of the aquaculture vessel 100.

[0040] It can be understood that the linear relationship K is a proportional coefficient between the current difference and the tension difference determined through experiments or experience, which is used to guide current adjustment and ensure that the forces on each inclined gantry unit 201 are balanced to avoid local overload or uneven force.

[0041] In this embodiment, by real-time monitoring and adjustment of the current and tension of the winch, it is ensured that the inclined gantry unit 201 is subjected to uniform and stable force during the launching of the aquaculture vessel 100. Among them, the introduction of the tension sensor realizes the precise measurement of tension, the calculation of the current difference provides an intuitive reflection of the load change, and the application of the linear relationship K makes the current adjustment more scientific and accurate. Compared with the existing technology, this solution can effectively avoid the problems of damage to the hull structure or instability in the launching process due to uneven force, and improves the safety and reliability of the launching operation. As a preferred embodiment, the tension sensor can adopt a resistive strain type or a piezoelectric sensor, which has the characteristics of high precision and fast response. Furthermore, the control room can be equipped with an automated control system to automatically adjust the output current of the winch according to real-time data, reduce manual intervention, and improve operational efficiency.

[0042] Furthermore, the above-mentioned ship launching method further comprises: S5. Set the maximum launching acceleration of the aquaculture vessel 100 to 0.05 m / s², the gust coefficient to 1.5, and the safety factor to 2; Collecting the center of gravity height, windward area, and centroid height of the windward area of ​​the aquaculture vessel 100; Collect the historical maximum wind pressure in the area where the aquaculture vessel 100 was launched; Calculate the capsizing moment of the aquaculture vessel 100 based on the maximum launching acceleration, the center of gravity height, the windward area, the height of the centroid of the windward area, and the historical maximum wind pressure; Calculate the anti-overturning moment of the aquaculture vessel 100 based on the maximum contact width between the supporting beam 4 and the transverse pontoon 102; Calculate the ratio of the anti-overturning moment to the overturning moment; If the ratio is greater than or equal to the safety factor, the design loads of the longitudinal pontoon 101 and the transverse pontoon 102 are collected, and the actual loads of the longitudinal pontoon 101 and the transverse pontoon 102 after the coupling platform 3 and the supporting beam 4 are arranged are verified; If the actual load is greater than the design load, the number of the coupling beam platforms 3 is increased; If the actual load is less than the designed load, the aquaculture vessel 100 will be launched; If the ratio is less than the safety factor, the supporting crossbeam 4 and the connecting beam platform 3 are extended so that the supporting crossbeam 4 and the connecting beam platform 3 overlap the left longitudinal pontoon and the right longitudinal pontoon.

[0043] The maximum launching acceleration avoids instability caused by inertial force by limiting the rate of change of the hull's motion speed. The gust coefficient is used to amplify the static wind pressure to simulate the instantaneous wind load impact, and the safety factor is used as a redundant design basis for the anti-overturning capability. In the calculation of the overturning moment, the difference between the centroid height and the center of gravity height of the wind-exposed area directly affects the length of the moment arm, and the historical maximum wind pressure is obtained through meteorological data. The calculation of the anti-overturning moment depends on the contact width between the supporting beam 4 and the transverse pontoon 102, which is determined by structural drawings or on-site measurements. The actual load verification is monitored in real time using strain gauges or pressure sensors. The increase in the number of connecting beam platforms 3 is achieved by adding pad beams, and the extension of the supporting beams 4 and connecting beam platforms 3 is completed by segmented splicing or overall replacement of longer components.

[0044] Specifically, the maximum launching acceleration avoids structural overload by limiting the inertia force of the hull movement, and the gust coefficient is used to amplify the static wind load to simulate extreme working conditions. The safety factor is set to 2, which is based on the conventional safety margin requirements of marine engineering structures. In the calculation of the overturning moment, the difference between the centroid height and the center of gravity height of the wind-exposed area directly affects the length of the moment arm, and the historical maximum wind pressure adopts the local 50-year extreme value data. The calculation of the anti-overturning moment depends on the contact width between the supporting beam 4 and the transverse pontoon 102, which is determined by finite element analysis or physical measurement. When the actual load is verified, if it is necessary to add a connecting beam platform 3, it is preferred to add it symmetrically in the bow and stern areas to maintain the balance of the hull. When extending the supporting beam 4 and the connecting beam platform 3, the extended length must cover more than 60% of the width of the left / right longitudinal pontoon to ensure effective force transmission.

[0045] To cope with complex working conditions, the method also includes the following details: The launching time is chosen during the low tide period, and the tidal velocity is ≤0.5m / s. In order to avoid the hull deviation caused by the impact of the water flow, the winch tension compensation adjustment is made. For example, for every 0.1m / s increase in water flow velocity, the tension increases by 5%.

[0046] When launching in winter, apply low-temperature grease to the inclined gantry rails to reduce the friction coefficient to 0.15.

[0047] When the water is discharged during high temperatures in summer, spray water on the rails for 30 seconds every 10 minutes to prevent thermal expansion and deformation.

[0048] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A ship launching method, the method being applied to a farming vessel (100) having a column-stabilized box-type structure, comprising the following steps: S1, dividing the oblique ship frame unit (200) into a plurality of staggered first support areas (1) and second support areas (2); S2. A connecting beam platform (3) is arranged on at least one of the second supporting areas (2), and supporting cross beams (4) are arranged on the remaining first supporting areas (1); the second supporting area (2) where the connecting beam platform (3) is located comprises two oblique gantry units (201), both sides of the connecting beam platform (3) extend outward from the middle longitudinal pontoon (101), and the two ends are respectively overlapped with the two oblique gantry units (201), and the connecting beam platform (3), the supporting cross beam (4) and the supporting surface of the first supporting area (1) are coplanar; S3, moving the aquaculture vessel (100) transversely twice to above the inclined ship frame unit (200), so that the longitudinal center line of the middle longitudinal pontoon (101) coincides with the line connecting the center point of the connecting beam platform (3) and the center point of the supporting beam (4); S4, the aquaculture vessel (100) is launched into the water by means of a winch.

2. The ship launching method according to claim 1, characterized in that: In the S2, the connecting beam platform (3) includes a platform beam (31), a first padding beam (32) and a second padding beam (33); the number of the platform beams (31) is two, and they are arranged in parallel along the length direction of the inclined ship frame unit (200); the number of the first padding beam (32) and the second padding beam (33) are both two, wherein the first padding beam (32) is respectively padded on one platform beam (31), and the second padding beam (33) is padded on the inclined ship frame unit (201) and is located between the two platform beams (31); the first padding beam (32) is used to support the transverse pontoon (102), and the second padding beam (33) is used to support the middle longitudinal pontoon (101); The difference between the support surface height of the connecting beam platform (3) and the support surface height of the supporting beam (4) is compensated by the tilt angle of the inclined ship frame unit (201), so that the longitudinal center line of the middle longitudinal pontoon (101) coincides with the line connecting the center point of the connecting beam platform (3) and the center point of the supporting beam (4).

3. The ship launching method according to claim 2, characterized in that: In said S2, the height of the connecting beam platform (3) is 0.7 meters, and the height of the supporting beam (4) is 0.8 meters.

4. The ship launching method according to claim 1, characterized in that: In said S3, the aquaculture vessel (100) is moved transversely twice to above the inclined ship frame, specifically comprising: S31, mark the side of the middle longitudinal pontoon (101) facing the slipway, evenly load a number of hydraulic trolleys on the left longitudinal pontoon, the middle longitudinal pontoon (101) and the right longitudinal pontoon, and use the hydraulic trolleys to move the aquaculture vessel (100) laterally until the mark is away from the edge of the slipway to a preset distance; S32, unloading the hydraulic trolley located in the area of ​​the extended trestle of the inclined gantry, and the remaining hydraulic trolleys continue to move laterally until the longitudinal center line of the middle longitudinal pontoon (101) coincides with the line connecting the center point of the connecting beam platform (3) and the center point of the supporting beam (4).

5. The ship launching method according to claim 1, characterized in that: In said S4, pulling the aquaculture vessel (100) into the water by means of a winch specifically includes: S41. The aquaculture vessel (100) is pulled by a winch to run at a first speed of 0.3 m / min for 30 minutes, and then increased to a second speed of 0.6 m / min for uniform operation. During the operation, the current value of the winch is monitored and the force of each inclined ship frame unit (201) is adjusted until the launching operation is completed.

6. The ship launching method according to claim 5, characterized in that: In said S41, monitoring the current value of the winch during operation and adjusting the force of each inclined gantry unit (201) specifically includes: S411. Record the no-load current value of each hoist, add a tension sensor to the transmission end of each hoist, and collect the actual tension of each hoist in real time; S412, monitoring the current value of each hoist in real time, and calculating the current difference, where the current difference is the current value and the no-load current value; S413. Preset a target pulling force in the control room and compare the difference between the actual pulling force and the target pulling force; S414. Based on the linear relationship K between the current difference and the tension difference, adjust the output current of each winch until the deviation between the actual tension of all winches and the target tension is less than 2%.

7. The ship launching method according to claim 1, characterized in that: The method further comprises: S5. Set the maximum launching acceleration of the aquaculture vessel (100) to 0.05 m / s², the gust coefficient to 1.5, and the safety factor to 2; Collecting the center of gravity height, windward area, and centroid height of the windward area of ​​the aquaculture vessel (100); The historical maximum wind pressure of the area where the aquaculture vessel (100) was launched was collected; Calculating the capsizing moment of the aquaculture vessel (100) based on the maximum launching acceleration, the center of gravity height, the windward area, the height of the centroid of the windward area, and the historical maximum wind pressure; Calculating the anti-overturning moment of the aquaculture vessel (100) based on the maximum contact width between the supporting beam (4) and the transverse buoyancy box (102); Calculate the ratio of the anti-overturning moment to the overturning moment; If the ratio is greater than or equal to the safety factor, the design loads of the middle longitudinal pontoon (101) and the transverse pontoon (102) are collected, and the actual loads of the middle longitudinal pontoon (101) and the transverse pontoon (102) after the coupling beam platform (3) and the supporting beam (4) are arranged are verified; If the actual load is greater than the design load, the number of the connecting beam platforms (3) is increased; If the actual load is less than the designed load, the aquaculture vessel (100) is launched; If the ratio is less than the safety factor, the supporting crossbeam (4) and the connecting beam platform (3) are extended so that the supporting crossbeam (4) and the connecting beam platform (3) overlap the left longitudinal pontoon and the right longitudinal pontoon.

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