A Strength Test Method for B-Type Compartments under Extreme Shallow Draft Conditions

Abstract

The present invention discloses a method for the strength test of a B-type cabin under the extreme shallow draft condition, including a method for the strength test of a B-type cabin under the extreme shallow draft condition, which is characterized in that: a No. 1 cabin, a No. 2 cabin, a No. 3 cabin and a No. 4 cabin are arranged on the B-type cabin and are sequentially connected by pipelines, and the No. 1 cabin, the No. 2 cabin, the No. 3 cabin and the No. 4 cabin are each divided into left and right two cabins, and the left and right two cabins are placed side by side on the ship in the experimental water area; Step S1: Inject water into the left cabin of the No. 1 cabin and the right cabin of the No. 3 cabin; Step S2: Inject water into the No. 1 cabin and the No. 3 cabin; Step S3: Drain the water in the No. 1 cabin and the No. 3 cabin, and inject water into the left cabin of the No. 2 cabin and the right cabin of the No. 4 cabin; This device solves the problems that the current strength test of the B-type cabin can only be carried out in deeper waters and the test period is long.

Description

Technical Field

[0001] The present invention relates to the technical field of ship design, and specifically to a method for the strength test of a Type B cabin under the condition of extreme shallow draft. Background Art

[0002] In the field of ship design and manufacturing, the strength test of a Type B cabin is an important link to ensure the structural safety of the ship. Traditionally, such tests usually increase the pressure inside the cabin by filling the cabin with water, and observe the deformation and structural integrity of the cabin wall under different pressures. However, this method faces some challenges in actual operation, especially under the condition of extreme shallow draft;

[0003] First of all, the traditional method requires a large amount of water to fill the cabin to reach the required test pressure, which not only increases the cost of the test, but may also be difficult to achieve in some waters (such as rivers with shallow water depths), because a large amount of water is required to raise the water level inside the cabin, thereby increasing the total weight of the cabin, forcing the Type B cabin to be tested only in deeper waters, and the test cycle is long; Therefore, a method for the strength test of a Type B cabin under the condition of extreme shallow draft is provided to solve the problems of being able to be tested only in deeper waters and having a long test cycle. Summary of the Invention

[0004] The purpose of the present invention is to propose a method for the strength test of a Type B cabin under the condition of extreme shallow draft, which is used to solve the technical problems in the prior art that the water filling time for the strength test of the Type B cabin is long, the dock cycle is long, and the water depth of the water area where it is located cannot ensure the strength test of a single Type B cabin.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A method for the strength test of a Type B cabin under the condition of extreme shallow draft, including a method for the strength test of a Type B cabin under the condition of extreme shallow draft, characterized in that: on the Type B cabin, there are arranged a No. 1 cabin, a No. 2 cabin, a No. 3 cabin and a No. 4 cabin connected in sequence by pipelines, and the No. 1 cabin, the No. 2 cabin, the No. 3 cabin and the No. 4 cabin are all divided into left and right two cabins, and the left and right two cabins are placed side by side on the ship in the experimental water area where they are located;

[0006] The method includes:

[0007] Step S1: Inject water into the left cabin of the No. 1 cabin and the right cabin of the No. 3 cabin, and check the strength and airtightness of the inner cabin walls of the No. 1 cabin and the No. 3 cabin;

[0008] Step S2: Inject water into the No. 1 cabin and the No. 3 cabin, and check the strength and airtightness of the No. 1 cabin and the No. 3 cabin;

[0009] Step S3: Drain the water in the No. 1 cabin and the No. 3 cabin, inject water into the left cabin of the No. 2 cabin and the right cabin of the No. 4 cabin, and check the strength and airtightness of the cabin walls of the No. 2 cabin and the No. 4 cabin;

[0010] Step S4: Fill the fourth left compartment and the fourth right compartment with water, fill the first compartment and the second compartment with water until the hull is balanced, and check the strength and airtightness of the fourth right compartment;

[0011] Step S5: Interchange the left and right compartments in the first compartment, the second compartment and the third compartment, and check the strength and airtightness of the fourth left compartment;

[0012] Step S6: Add water to the second right compartment and the second left compartment, drain water from the fourth right compartment, keep the fourth left compartment unchanged, empty the first compartment, and check the strength and airtightness of the second compartment.

[0013] The present invention further illustrates that the pipeline includes a low-pressure pipeline, a high-pressure pipeline and a pump body. The number of the pump bodies is the same as that of the B-type compartments, and the pump bodies correspond to the B-type compartments one by one;

[0014] In each B-type compartment, the pump bodies with corresponding relationships are respectively connected to the left and right compartments of the corresponding B-type compartment through two high-pressure pipelines, and the pump bodies with corresponding relationships are also respectively connected to the left and right compartments of the corresponding B-type compartment through two low-pressure pipelines. The pump bodies respectively control the water volumes in the left and right compartments of the same B-type compartment;

[0015] Between two adjacent different B-type compartments, the compartments on the same side are connected through a low-pressure pipeline.

[0016] The present invention further illustrates that filling and draining water into the B-type compartment by using the above pipeline includes the following methods:

[0017] When it is necessary to conduct a strength test on a certain compartment of the B-type compartment and the adjacent compartments of the compartment to be tested are all in the no-load state, start the pump body corresponding to the B-type compartment where the compartment is located. The pump body injects water into the compartment through the pipeline connection, controls the water injection volume of each compartment. When the water in the compartment is about to reach the required water level, reduce the output power of the pump body. The pump body injects water into the compartment through the low-pressure pipeline until the water in the compartment reaches the required water level, and completes the strength test of the corresponding compartment;

[0018] When it is necessary to drain the water from the compartment after the test is completed and conduct a strength test on its adjacent compartment, by opening the valve of the pipeline between the two adjacent compartments, the water in the compartment to be drained is injected into the compartment to be tested under the action of pressure. When the water pressures in the two compartments are equal or the water in the compartment to be tested reaches the required water level, close the valve of the pipeline between the two compartments. By starting the pump bodies corresponding to the two compartments, the pump bodies inject water and pump water to make the water levels in the corresponding compartments reach the test requirements, and complete the strength test of the corresponding compartment.

[0019] The present invention further illustrates that before the step S1, the following steps are further included:

[0020] Step S01 : Keep all compartments empty before the test, measure and record the draft of the hull.

[0021] Step S 02 : Given that the maximum pressure borne by the B-type compartment during operation is P1, it can be known that the rated height of the water level in the B-type compartment from the bottom of the compartment should be h at this time. Calculate the weight of the water in the compartment as m1 and obtain the rated draft as L. When the L is less than or equal to the water depth of the water area where it is located, obtain the required pressure in the compartment during the test as P1; when the L is greater than the water depth, obtain the required pressure in the compartment during the test as P1 + △p, where △p is the pressure that needs to be increased in the compartment during the test, and △p is proportional to the difference between the water depth and L. At this time, the rated height of the water level in the B-type compartment from the bottom of the compartment should be h1, and the weight of the water in the B-type compartment is m2.

[0022] Step S 03 : Adjust the pressure in the compartment according to the test plan. When the pressure in the compartment is adjusted to P1 + △p, start the test.

[0023] The present invention further explains that adjusting the pressure in the compartment according to the test plan includes:

[0024] Fix a pressure pump 9 inside each left and right compartment of the B-type compartment, and adjust the pressure in the compartment by compressing the air in its corresponding compartment through the pressure pump 9.

[0025] The present invention further explains that the water volumes in the left and right compartments of the same B-type compartment are controlled respectively, including:

[0026] The first compartment 1 includes a first compartment tank body. A first compartment wall is fixedly connected inside the first compartment tank body to divide it into a first left compartment and a first right compartment, so that the water in the left and right compartments of the first compartment tank body does not communicate with each other.

[0027] The water in the compartment to be drained is injected into the compartment to be tested under the action of pressure, including:

[0028] The first compartment also includes a first compartment sealing door. A first compartment sealing door is opened on the first compartment wall, and by controlling the opening of the first compartment sealing door, the water in the compartment to be drained is injected into the compartment to be tested.

[0029] The pump body injects water into the compartment through a pipeline, including:

[0030] A first left compartment water inlet hole and a first right compartment water inlet hole are opened above the first compartment tank body, and the first left compartment is injected with water through the connection of the first left compartment water inlet hole with the pipeline of the first pump body, and the first right compartment is injected with water through the connection of the first right compartment water inlet hole with the pipeline of the first pump body.

[0031] The present invention is further described as follows. Calculating the weight of water in the computing cabin includes:

[0032] Given that the internal volume of the B-type cabin is C and the internal height is α, by setting the left and right compartments in the B-type cabin to have the same shape, the volume of each compartment is , obtaining the .

[0033] The present invention is further described as follows. Controlling the water injection volume of each compartment includes:

[0034] By setting liquid level detectors in the left and right compartments of the B-type cabin and detecting the depth of water in the compartment through the liquid level detectors, when the depth of water required for the water test is reached, an alarm is issued to stop the staff from injecting water.

[0035] The present invention is further described as follows. Controlling the water injection volume of each compartment further includes:

[0036] Injecting thick and turbulent water flow into the corresponding compartment through the high-pressure pipeline. When the required water volume is about to be reached, injecting thin and slow water flow into the corresponding compartment through the low-pressure pipeline until the required water volume is reached.

[0037] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention calculates the required test pressure through the draft of the hull and the maximum pressure of the B-type cabin. When the required test pressure exceeds the maximum pressure allowed in the water area, the pressure in the compartment is adjusted through the pressure pump, enabling the test to be carried out in a shallower water area;

[0038] Through the pipeline system, the pump body corresponds to the B-type cabin one by one, and the water volume of each compartment can be controlled separately. This not only improves the flexibility of the test but also can accurately control the water level in the compartment, saving experimental time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0040] Figure 1 is the overall front structural schematic diagram of the embodiment of the present invention;

[0041] Figure 2 is the structural schematic diagram of the No. 1 cabin of the embodiment of the present invention;

[0042] Figure 3 is the overall top view structural schematic diagram of the embodiment of the present invention;

[0043] Figure 4 is the structural schematic diagram of the pipeline system of the embodiment of the present invention;

[0044] Figure 5 It is a schematic diagram of a comparative test before and after changing the air pressure in the cabin according to an embodiment of the present invention;

[0045] Figure 6 It is a schematic structural diagram of step S1 according to an embodiment of the present invention;

[0046] Figure 7 It is a schematic structural diagram of step S2 according to an embodiment of the present invention,

[0047] Figure 8 It is a schematic structural diagram of step S3 according to an embodiment of the present invention;

[0048] Figure 9 It is a schematic structural diagram of step S4 according to an embodiment of the present invention;

[0049] Figure 10 It is a schematic structural diagram of step S5 according to an embodiment of the present invention;

[0050] Figure 11 It is a schematic structural diagram of step S6 according to an embodiment of the present invention;

[0051] In the figure: 1. No. 1 cabin; 101. Left water inlet hole of No. 1 cabin; 102. Right water inlet hole of No. 1 cabin; 103. Left chamber of No. 1 cabin; 104. Right chamber of No. 1 cabin; 105. Sealing door of No. 1 cabin; 106. Tank body of No. 1 cabin; 107. Wall of No. 1 cabin; 2. No. 2 cabin; 201. Left water inlet hole of No. 2 cabin; 202. Right water inlet hole of No. 2 cabin; 203. Left chamber of No. 2 cabin; 204. Right chamber of No. 2 cabin; 205. Sealing door of No. 2 cabin; 3. No. 3 cabin; 301. Left water inlet hole of No. 3 cabin; 302. Right water inlet hole of No. 3 cabin; 303. Left chamber of No. 3 cabin; 304. Right chamber of No. 3 cabin; 305. Sealing door of No. 3 cabin; 4. No. 4 cabin; 401. Left water inlet hole of No. 4 cabin; 402. Right water inlet hole of No. 4 cabin; 403. Left chamber of No. 4 cabin; 404. Right chamber of No. 4 cabin; 405. Sealing door of No. 4 cabin; 5. Pump body one; 6. Pump body two; 7. Pump body three; 8. Pump body four; 9. Pressure pump. Specific implementation manners

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] Please refer to Figure 1 — Figure 4 , the present invention provides a technical solution: a method for testing the strength of a B-type cabin under an extreme shallow draft condition, including a No. 1 cabin 1 and a pipeline system.

[0054] AsFigure 1 As shown, in some embodiments, the pipeline of the first cabin 1 is connected to the second cabin 2, the pipeline of the second cabin 2 is connected to the third cabin 3, the pipeline of the third cabin 3 is connected to the fourth cabin 4, and the first cabin 1, the second cabin 2, the third cabin 3, and the fourth cabin 4 are placed side by side on a ship in the experimental water area.

[0055] As Figure 2 As shown, in some embodiments, the first cabin 1 includes a first cabin tank body 106 and a first cabin wall 107. The interior of the first cabin tank body 106 is fixedly connected to the first cabin wall 107. The first cabin wall 107 divides the interior of the first cabin tank body 106 into a first left cabin 103 and a first right cabin 104 on average, and the first left cabin 103 and the first right cabin 104 have the same shape.

[0056] The first cabin 1 further includes a first cabin sealed door 105. The first cabin sealed door 105 is opened on the first cabin wall 107. The first cabin sealed door 105 is used to control the communication and separation between the first left cabin 103 and the first right cabin 104. Above the first cabin tank body 106, a first left water inlet hole 101 and a first right water inlet hole 102 are opened. The first left water inlet hole 101 is used to drain water into the first left cabin 103, and the first right water inlet hole 102 is used to drain water into the first right cabin 104.

[0057] At the top of the inner wall of the first cabin tank body 106, two pressure pumps 9 are fixedly connected. Each pressure pump 9 is respectively located inside the first left cabin 103 and the first right cabin 104. The pressure pump 9 is used to change the internal pressure by compressing the air in the corresponding cabin.

[0058] As Figure 3 As shown, in some embodiments, the second cabin 2 includes a second left water inlet hole 201, a second right water inlet hole 202, a second left cabin 203, a second right cabin 204, and a second cabin sealed door 205;

[0059] The third cabin 3 includes a third left water inlet hole 301, a third right water inlet hole 302, a third left cabin 303, a third right cabin 304, and a third cabin sealed door 305;

[0060] The fourth cabin 4 includes a fourth left water inlet hole 401, a fourth right water inlet hole 402, a fourth left cabin 403, a fourth right cabin 404, and a fourth cabin sealed door 405;

[0061] The first cabin 1, the second cabin 2, the third cabin 3, and the fourth cabin 4 have the same structure and will not be elaborated here.

[0062] Embodiment 1: In this embodiment, a pipeline system is provided. As Figure 4As shown, in some embodiments, the pipeline system includes a low-pressure pipeline and a high-pressure pipeline. The low-pressure pipeline is the black line part in the figure and is used for the passage of small and slow water flows. The high-pressure pipeline is the red line part in the figure and is used for the passage of thick and rapid water flows.

[0063] The pipeline system includes pump body 1 5, pump body 2 6, pump body 3 7, and pump body 4 8, where:

[0064] Pump body 1 5 includes a pump body 1 water inlet, a pump body 1 low-pressure water outlet, and two pump body 1 high-pressure water outlets. The pump body 1 water inlet is connected to the river water through a pipeline. The two pump body 1 high-pressure water outlets are respectively connected to the No. 1 left cabin 103 and the No. 1 right cabin 104 through pipelines. The pump body 1 low-pressure water outlet is connected to the No. 1 left cabin 103 and the No. 1 right cabin 104 through a three-way pipeline. The No. 1 left cabin 103 is connected to the No. 2 left cabin 203 through a pipeline, and a flowmeter is connected to the pipeline between the No. 1 left cabin 103 and the No. 2 left cabin 203. The No. 1 right cabin 104 is connected to the No. 2 right cabin 204 through a pipeline, and a flowmeter is connected to the pipeline between the No. 1 right cabin 104 and the No. 2 right cabin 204.

[0065] Pump body 2 6 includes a pump body 2 water inlet, a pump body 2 low-pressure water outlet, and two pump body 2 high-pressure water outlets. The pump body 2 water inlet is connected to the river water through a pipeline. The two pump body 2 high-pressure water outlets are respectively connected to the No. 2 left cabin 203 and the No. 2 right cabin 204 through pipelines. The pump body 2 low-pressure water outlet is connected to the No. 2 left cabin 203 and the No. 2 right cabin 204 through a three-way pipeline. The No. 2 left cabin 203 is connected to the No. 3 left cabin 303 through a pipeline, and a flowmeter is connected to the pipeline between the No. 2 left cabin 203 and the No. 3 left cabin 303. The No. 2 right cabin 204 is connected to the No. 3 right cabin 304 through a pipeline, and a flowmeter is connected to the pipeline between the No. 2 right cabin 204 and the No. 3 right cabin 304.

[0066] Pump body 3 7 includes a pump body 3 water inlet, a pump body 3 low-pressure water outlet, and two pump body 3 high-pressure water outlets. The pump body 3 water inlet is connected to the river water through a pipeline. The two pump body 3 high-pressure water outlets are respectively connected to the No. 3 left cabin 303 and the No. 3 right cabin 304 through pipelines. The pump body 3 low-pressure water outlet is connected to the No. 3 left cabin 303 and the No. 3 right cabin 304 through a three-way pipeline. The No. 3 left cabin 303 is connected to the No. 4 left cabin 403 through a pipeline, and a flowmeter is connected to the pipeline between the No. 3 left cabin 303 and the No. 4 left cabin 403. The No. 3 right cabin 304 is connected to the No. 4 right cabin 404 through a pipeline, and a flowmeter is connected to the pipeline between the No. 3 right cabin 304 and the No. 4 right cabin 404.

[0067] The pump body four 8 includes a water inlet of the pump body four, a low-pressure water outlet of the pump body four, and two high-pressure water outlets of the pump body four. The water inlet of the pump body four is connected to the river water through a pipeline. The two high-pressure water outlets of the pump body four are respectively connected to the No. 4 left compartment 403 and the No. 4 right compartment 404 through pipelines. The low-pressure water outlet of the pump body four is connected to the No. 4 left compartment 403 and the No. 4 right compartment 404 through a three-way pipeline.

[0068] The specific steps are as follows:

[0069] Step S1: Pump body pumping water: The four pump bodies (pump body one 5, pump body two 6, pump body three 7, pump body four 8) work independently, and their water inlets are all connected to the river water. When the pump bodies are started, the pump bodies draw water from the river water and pressurize the water. The pressurized water is divided into two parts: one part is output through the high-pressure water outlet to provide a thick and rapid water flow to the corresponding compartment; the other part is output through the low-pressure water outlet and, after passing through the three-way pipeline, provides a thin and slow water flow to the corresponding compartment.

[0070] Step S2: Pipeline guiding: The low-pressure pipeline (black line) and the high-pressure pipeline (red line) play a guiding role in the system to ensure that the water can flow along the predetermined route. The low-pressure pipeline is mainly used for the passage of the thin and slow water flow, while the high-pressure pipeline is used for the passage of the thick and rapid water flow. The connection between the pipeline and each compartment ensures that the water can flow smoothly from one compartment to another.

[0071] Step S3: Compartment storage and distribution: Each compartment (compartment one 1, compartment two 2, compartment three 3, compartment four 4) is divided into left and right parts, which can store the water flow from the pump body respectively. Flow meters are installed at the pipeline connection points between the compartments to monitor and record the water volume flowing through this point. According to needs, the water in the compartment can be further distributed to each compartment on the ship through the pipeline.

[0072] Step S4: Overall coordination: The entire system realizes the effective extraction and utilization of the river water through the pumping of the pump body, the guiding of the pipeline, and the storage and distribution functions of the compartment. Through the close cooperation between the pipeline and each compartment, the stability and reliability of the system are ensured.

[0073] Step S5: Special function: The pressure in each compartment is adjusted by the pressure pump 9.

[0074] The following embodiments are realized through the above pipeline system, and specific regulation can be carried out according to specific situations.

[0075] Embodiment 2: In this embodiment, based on the pipeline system of Embodiment 1, an example is given to illustrate the control method of the pipeline system;

[0076] During the strength detection test of the B-type cabin, it is necessary to inject water into the cabins in different B-type cabins. This method mainly controls the water level in the cabins through a detection rod, a pump body, a flow meter, and the pipelines and sealing doors between the cabins;

[0077] For example: when it is necessary to fill the No. 1 left cabin 103 with water, the staff inserts the detection rod vertically into the left water inlet hole 101 of the No. 1 cabin. By starting the first pump body 5, the first pump body 5 injects the river water into the No. 1 left cabin 103 through the high-pressure pipeline. When the detection rod detects that the distance from the water level in the No. 1 left cabin 103 to the cabin bottom is about to reach the required value, the first pump body 5 is switched to inject water through the low-pressure pipeline. When the detection rod detects that the distance from the water level in the No. 1 left cabin 103 to the cabin bottom completely reaches the required value, the first pump body 5 is closed.

[0078] When the water levels in the No. 1 left cabin 103 and the No. 1 right cabin 104 need to be leveled, by opening the No. 1 cabin sealing door 105, the water in the No. 1 left cabin 103 enters the No. 1 right cabin 104 through the No. 1 cabin sealing door 105 and reaches the same level.

[0079] When the No. 2 left cabin 203 needs to be filled with water and the No. 1 left cabin 103 needs to be drained, by opening the pipeline connection between the No. 2 left cabin 203 and the No. 1 left cabin 103, the river water in the No. 1 left cabin 103 is injected into the No. 2 left cabin 203. When the flow meter between the No. 1 left cabin 103 and the No. 2 left cabin 203 measures that the water flow reaches the required water volume of the No. 2 left cabin 203, or when the water levels in the No. 1 left cabin 103 and the No. 2 left cabin 203 are leveled, the pipeline connection between the No. 2 left cabin 203 and the No. 1 left cabin 103 is closed, and the first pump body 5 is opened to drain the river water in the No. 1 left cabin 103 into the river through the high-pressure pipeline. When the volume of the river water in the No. 2 left cabin 203 does not reach the required value at this time, the second pump body 6 is started to inject water into the No. 2 left cabin 203.

[0080] And so on. Each cabin has two or three adjacent cabins. To improve the efficiency of water injection, drainage, and experiments, at least two cabins are filled with water in each experimental step, and at least two cabins do not contact each other. In this way, in each adjacent step, two adjacent cabins are mutually drained (mutual drainage means opening the pipelines or sealing doors between two adjacent cabins, so that the water in the cabin with relatively higher water pressure flows into the adjacent cabin under the action of pressure), so as to reduce the required time and energy consumption for water injection and drainage at one time.

[0081] Based on the above embodiments, by adjusting and controlling the pipeline system and the pressure pump 9, the water addition amount of the B-type cabin is reduced, and the strength tests of each cabin are completed in the Yangtze River with a relatively shallow water depth.

[0082] The current method for measuring the strength of the B-type cabin is to only fill the B-type cabin with water, observe the water intake of the B-type cabin, and detect the strength of the cabin wall under the pressure of water. Let the distance from the water level in the cabin to the bottom of the cabin wall be h, and the pressure on the cabin wall is as follows:

[0083]

[0084] In the formula: is the density of water;

[0085] g is the acceleration due to gravity;

[0086] P 气 is the atmospheric pressure;

[0087] It can be obtained that:

[0088]

[0089] The method of this experiment changes the pressure in the B-type cabin by compressing the air in the cabin where the pressure pump 9 is located, so that the pressure in the B-type cabin is greater than the atmospheric pressure. It can be obtained that:

[0090]

[0091] In the formula: P 舱 is the air pressure in the B-type cabin;

[0092] h1 is the distance from the water level in the cabin of this method to the bottom of the cabin wall.

[0093] Since P 舱 >P 气 So h1 < h, it can be seen that the water injection volume into the B-type cabin by this method is less than that of the conventional method, as Figure 5 shown.

[0094] Example 3: Based on the above example, this example provides a method for testing the strength of the B-type cabin under the condition of extreme shallow draft. The specific scheme is as follows:

[0095] Step S1: Check the strength and airtightness of the cabin walls in the No. 1 cabin 1 and the No. 3 cabin 3

[0096] Add water to the left cabin 103 of the No. 1 cabin and the right cabin 304 of the No. 3 cabin to a height of 6 meters (from the bottom of the cabin) respectively. The water injection volumes are about 3100 tons and 3600 tons respectively.

[0097] After the water injection is completed, observe and record the deformation of the cabin wall, and at the same time check whether the weld leaks.

[0098] Other B-type cabins remain in the empty state, as Figure 6As shown, it can be seen from the figure that except for the No. 4 left cabin 403, other cabins are adjacent to the No. 1 left cabin 103 and the No. 3 right cabin 304. On the premise of ensuring the balance of the hull, the time required to add water to other cabins in the next step is reduced.

[0099] At this time, the forward draft of the ship is 5 meters, the after draft is 5.6 meters, there is no obvious deformation of the bulkhead, and there is no leakage at the weld.

[0100] Step S2: Check the strength and airtightness of the No. 1 cabin 1 and the No. 3 cabin 3

[0101] Add water to the No. 1 left cabin 103, the No. 1 right cabin 104, the No. 3 left cabin 303 and the No. 3 right cabin 304 to a height of 12.5 meters (from the bottom of the cabin) respectively. The water addition amounts are approximately 13,400 tons and 15,400 tons respectively.

[0102] After the water addition is completed, comprehensively check the strength and structural integrity of the liquid cargo tank.

[0103] Other Type B cabins remain in the empty state, such as Figure 7 As shown, it can be seen from the figure that each water-added cabin has a non-water-added cabin adjacent to it. On the premise of ensuring the balance of the hull, the time required to add water to the cabins without water in the next step is saved.

[0104] At this time, both the forward draft and the after draft of the ship are 8.5 meters, there is no obvious deformation of the bulkhead, the structure is intact, and there is no leakage at the weld.

[0105] Step S3: Check the strength and airtightness of the bulkheads of the No. 2 cabin 2 and the No. 4 cabin 4

[0106] Empty the water in the No. 1 cabin 1 and the No. 3 cabin 3.

[0107] Add water to the No. 2 left cabin 203 and the No. 4 right cabin 404 to a height of 6 meters (from the bottom of the cabin) respectively. The water addition amounts are approximately 3,100 tons and 3,600 tons respectively.

[0108] After the water addition is completed, check the strength of the bulkhead and the tightness of the weld.

[0109] Other Type B cabins remain in the empty state, such as Figure 8 As shown, it can be seen from the figure that except for the No. 1 cabin 104, other cabins are adjacent to the No. 2 left cabin 203 and the No. 4 right cabin 404. On the premise of ensuring the balance of the hull, the time required to add water to other cabins in the next step is reduced.

[0110] At this time, the forward draft of the ship is 5.5 meters, the after draft is 6.2 meters, there is no obvious deformation of the bulkhead, and there is no leakage at the weld.

[0111] Step S4: Check the strength and airtightness of the fourth right compartment 404

[0112] Add water to the fourth left compartment 403 to a height of 6 meters, approximately 3200 tons; add water to the fourth right compartment 404 to a height of 12.5 meters, approximately 7300 tons.

[0113] Meanwhile, some water needs to be filled in the first compartment 1 and the second compartment 2 to maintain the balance of the ship.

[0114] After the water addition is completed, check the strength of the fourth right compartment 404.

[0115] Other Type B compartments remain in an empty or appropriately loaded state, as Figure 9 shown.

[0116] At this time, the forward draft of the ship is 8.2 meters, the aft draft is 8.4 meters, there is no obvious deformation of the bulkhead, and no leakage at the welds.

[0117] Step S5: Check the strength and airtightness of the fourth left compartment 403

[0118] Add 7300 tons of water to the fourth right compartment 404 and 3300 tons of water to the fourth left compartment 403; add 500 tons of water to the first right compartment 104 and 2100 tons of water to the first left compartment 103; add 3600 tons of water to the second right compartment 204.

[0119] Other Type B compartments remain in an empty or appropriately loaded state, as Figure 10 shown.

[0120] The forward draft of the ship is 8.2 meters, the aft draft is 8.4 meters, there is no obvious deformation of the bulkhead, and no leakage at the welds.

[0121] Step S6: Check the strength and airtightness of the second compartment 2

[0122] Add water to the second right compartment 204 and the second left compartment 203 respectively to a height of 12.5 meters, approximately 7700 tons each.

[0123] Drain the water in the fourth right compartment 404 to 3300 tons, keep the fourth left compartment 403 unchanged; empty the water in the first right compartment 104 and the first left compartment 103.

[0124] Check the strength of the second compartment 2.

[0125] Other ballast compartments remain in an appropriately loaded state, as shown in Figure 11.

[0126] At this time, the forward draft of the ship is 7.8 meters, the aft draft is 8.2 meters, there is no obvious deformation of the bulkhead, and no leakage at the welds.

[0127] The experimental data are as in the above three embodiments, and the following experimental results are summarized;

[0128] Step S1: The draft at the bow of the ship is 5 meters, and the draft at the stern is 5.6 meters.

[0129] S2: The drafts at both the bow and stern of the ship are 8.5 meters.

[0130] S3: The draft at the bow of the ship is 5.5 meters, and the draft at the stern is 6.2 meters.

[0131] S4: The draft at the bow of the ship is 8.2 meters, and the draft at the stern is 8.4 meters.

[0132] S5: The draft at the bow is 8.2 meters, and the draft at the stern is 8.4 meters.

[0133] S6: The draft at the bow of the ship is 7.8 meters, and the draft at the stern is 8.2 meters.

[0134] In the above steps, there is no obvious deformation of the bulkhead of type B, and no leakage at the welds.

[0135] By analyzing the above experimental results, the following result analysis can be obtained;

[0136] During the experiment, the drafts at the bow and stern of the ship changed with the increase and decrease of the water volume in the cabin, but always remained within the safe range, which proves that through the precise and stable operation of the pipeline system and pressure control, this experiment can be safely carried out in relatively shallow waters.

[0137] Through the overall arrangement of four type B cabins and experimental steps and flexible water addition and drainage operations, the experimental time was effectively saved, which proves the high efficiency and practicality of the experimental method.

[0138] During each water addition stage, no obvious deformation or weld leakage occurred in the bulkhead, indicating that the bulkhead has sufficient strength and sealing performance.

[0139] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0140] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A strength test method for type B tank under extreme shallow draft conditions, characterized in that: A No. 1 cabin (1), a No. 2 cabin (2), a No. 3 cabin (3) and a No. 4 cabin (4) are arranged on the B-type cabin and are connected in sequence by pipelines, and the No. 1 cabin (1), the No. 2 cabin (2), the No. 3 cabin (3) and the No. 4 cabin (4) are all divided into two left and right cabins, and the left and right cabins are placed side by side on the ship in the experimental waters; The method comprises: Step S1: injecting water into the left compartment of cabin No. 1 and the right compartment of cabin No. 3 to check the strength and air tightness of the inner walls of cabin No. 1 (1) and cabin No. 3 (3); Step S2: injecting water into the No. 1 compartment (1) and the No. 3 compartment (3) to check the strength and air tightness of the No. 1 compartment (1) and the No. 3 compartment (3); Step S3: draining the water in the No. 1 cabin (1) and the No. 3 cabin (3), injecting water into the No. 2 left cabin and the No. 4 right cabin, and checking the strength and air tightness of the walls of the No. 2 cabin (2) and the No. 4 cabin (4); Step S4: filling water into the No. 4 left cabin and the No. 4 right cabin, and filling water into the No. 1 cabin (1) and the No. 2 cabin (2) until the hull is balanced, and checking the strength and airtightness of the No. 4 right cabin; Step S5: swapping the left and right compartments in the No. 1 compartment (1), the No. 2 compartment (2) and the No. 3 compartment (3) to check the strength and air tightness of the No. 4 left compartment; Step S6: Add water to the right compartment No. 2 and the left compartment No. 2, drain the right compartment No. 4, leave the left compartment No. 4 unchanged, drain the No. 1 compartment (1), check the strength and airtightness of the No. 2 compartment (2); The pipeline includes a low-pressure pipeline, a high-pressure pipeline and a pump body, the number of the pump bodies is the same as that of the B-type cabins, and the pump bodies correspond to the B-type cabins one by one; In each B-type cabin, a corresponding pump body is connected to the left and right cabins of the corresponding B-type cabin through two high-pressure pipelines, and a corresponding pump body is also connected to the left and right cabins of the corresponding B-type cabin through two low-pressure pipelines, and the pump body controls the water volume of the left and right cabins in the same B-type cabin respectively; In two adjacent different B-type cabins, the cabins on the same side are connected by low-pressure pipelines.

2. A B-type tank strength test method under extreme shallow draft conditions according to claim 1, characterized in that: The above-mentioned pipeline is used to fill and drain water into the type B tank, including the following methods: When a strength test is required for a certain compartment of a type B tank, and when the adjacent compartments of the compartment to be tested are kept in an unloaded state, the pump corresponding to the type B tank where the compartment is located is started, and the pump is connected to inject water into the compartment through a pipeline, and the water injection amount of each compartment is controlled. When the water in the compartment is about to reach the required water level, the output power of the pump is reduced, and the pump is injected into the compartment through a low-pressure pipeline until the water in the compartment reaches the required water level, thereby completing the strength test of the corresponding compartment; When it is necessary to drain the cabin that has completed the test and conduct a strength test on its adjacent cabin, the valve of the pipeline between the two adjacent cabins is opened, and the water in the cabin to be drained is injected into the cabin to be tested under the action of pressure. When the water pressure in the two cabins is equal or the water in the cabin to be tested reaches the required water level, the valve of the pipeline between the two cabins is closed, and the corresponding pumps of the two cabins are started. The pumps are filled and pumped to make the water level in the corresponding cabins reach the test requirements, and the strength test of the corresponding cabins is completed.

3. The strength test method of type B tank under extreme shallow draft conditions according to claim 1 is characterized by: Before step S1, the method further includes: Step S 01 : Before the test, all compartments are kept empty, and the draft of the hull is measured and recorded; Step S 02 :It is known that the maximum pressure carried by the B-type tank during operation is P1. It can be known that the rated height of the horizontal plane in the B-type tank from the bottom of the tank should be h. The weight of the water in the tank is calculated to be m1, and the rated draft is obtained as L. When L is less than or equal to the water depth of the water area, the required pressure in the tank during the test is P1; when L is greater than the water depth, the required pressure in the tank during the test is P1+△p, and △p is the pressure that needs to be increased in the tank during the test. △p is proportional to the difference between the water depth and L. At this time, the rated height of the horizontal plane in the B-type tank from the bottom of the tank should be h1, and the weight of the water in the B-type tank is m2; Step S 03 :Adjust the pressure in the cabin according to the test plan. When the pressure in the cabin is adjusted to P1+△p, start the test.

4. A B-type tank strength test method under extreme shallow draft conditions according to claim 3, characterized in that: The adjusting the pressure in the cabin according to the test plan includes: A pressure pump (9) is fixedly connected to the interior of each left and right cabin of the B-type cabin, and the pressure in the cabin is adjusted by compressing the air in the cabin by the pressure pump (9).

5. The B-type tank strength test method for a B-type tank strength test under extreme shallow draft conditions according to claim 1 is characterized by: The water volume of the left and right compartments in the same B-type cabin is controlled separately, including: The No. 1 tank (1) comprises a No. 1 tank body (106), and a No. 1 bulkhead (107) is fixedly connected inside the No. 1 tank body (106) to divide the interior of the No. 1 tank body (106) into a No. 1 left cabin (103) and a No. 1 right cabin (104), so that water in the left and right cabins of the No. 1 tank body (106) is not inter-connected; The water in the tank to be drained is injected into the tank to be tested under pressure, including: The No. 1 cabin (1) further comprises a No. 1 cabin sealing door (105), and the No. 1 cabin sealing door (105) is provided on the No. 1 bulkhead (107), and the No. 1 cabin sealing door (105) is controlled to be opened so that water in the cabin to be drained can be injected into the cabin to be tested; The pump body injects water into the cabin through a pipeline, including: A No. 1 left water inlet (101) and a No. 1 right water inlet (102) are provided above the No. 1 tank body (106), and water is injected into the No. 1 left cabin (103) through the No. 1 left water inlet (101) connected to the pipeline of the pump body (5), and water is injected into the No. 1 right cabin (104) through the No. 1 right water inlet (102) connected to the pipeline of the pump body (5).

6. The B-type tank strength test method used for the B-type tank strength test under extreme shallow draft conditions according to claim 3 is characterized by: Calculate the weight of the water in the hold, including: It is known that the internal volume of the B-type cabin is C and the internal height is α. By setting the left and right cabins in the B-type cabin to the same shape, the volume of each cabin is , get the .

7. The B-type tank strength test method used for the B-type tank strength test under extreme shallow draft conditions according to claim 1 is characterized by: Control the water filling rate of each compartment, including: Liquid level detectors are arranged in the left and right compartments of the B-type tank, and the depth of water in the compartment is detected by the liquid level detectors. When the water depth required for the water test is reached, an alarm is sounded to request the staff to stop injecting water.

8. The B-type tank strength test method used for the B-type tank strength test under extreme shallow draft conditions according to claim 1 is characterized by: Control the water filling rate of each compartment, including: A thick and rapid water flow is injected into the corresponding compartment through the high-pressure pipeline. When the required water volume is about to be reached, a thin and slow water flow is injected into the corresponding compartment through the low-pressure pipeline until the required water volume is reached.

9. The B-type tank strength test method used for the B-type tank strength test under extreme shallow draft conditions according to claim 1 is characterized by: The pipeline fills and drains water into the cabin, including: The pump body is provided with a pump body water inlet, a pump body low-pressure water outlet and two pump body high-pressure water outlets. The pump body water inlet is connected to the pipeline of the water area, and the pump body low-pressure water outlet is connected to the left cabin and the right cabin of the corresponding B-type cabin through a three-branch pipe pipeline, so that each of the pump body high-pressure water outlets is connected to the left cabin and the right cabin pipeline of the corresponding B-type cabin, and finally the B-type cabin is pumped and drained through the pump body.

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