Automobile roll-on-roll-off ship deck cross beam trepanning arrangement structure
By constraining and optimizing the opening position and type of the cross beam of the deck of the car Ro-Ro-Board, the problems of weakening structural strength and design coordination are solved, and the effect of improving structural safety and reducing construction costs is achieved.
Patent Information
- Application Number
- CN202420065684.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-10
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-01-10
AI Technical Summary
The existing automotive Ro-Ro-Board deck beam opening design leads to weakening structural strength, increasing the weight and construction costs of ship empty ships, and the lack of a unified opening principle and method leads to design coordination difficulties and delays in progress.
By constraining the opening position and type, deck beams are divided into four types of areas, and openings of different sizes and types are set in different areas to reduce the weakening of structural strength, and optimize the opening arrangement to meet structural strength requirements.
It improves the safety of the ship structure, reduces the weight and construction costs of empty ships, reduces the specifications and welding volume of steel plates, and shortens the design cycle and design difficulty.
Smart Images
Figure CN222247538U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of ro-ro ship manufacturing, and in particular relates to a deck beam opening arrangement structure for a car ro-ro ship. Background Art
[0002] Car transport ro-ro ships are ships specially used to transport cars, trucks and other vehicles. Their cargo holds have multiple loading decks. In order to facilitate the passage of vehicles, transverse bulkheads are usually not installed in the cargo holds. The multiple decks are connected by double rows of pillars. Therefore, the deck beams usually have a larger span. In order to control the empty ship weight and the height between each deck, the deck beams need to be designed with a smaller web height and strength margin.
[0003] Due to the characteristics of loading vehicles, a large number of roll-on / roll-off equipment such as movable decks and ramps for vehicle operation and loading are designed in the cargo hold. At the same time, the cargo hold needs to have good ventilation, fire fighting and drainage functions. The normal operation of the above equipment or system requires a large number of cables and pipelines to be arranged in the cargo hold. In order not to affect the floor height and vehicle loading, dense openings of various sizes are usually opened on the deck beams for the passage of cables and pipelines. Therefore, the structural strength of the deck beams will be greatly weakened. The existing technology mainly focuses on the research of the reinforcement type of various openings, and measures such as local thickening of the opening area and reinforcement of the hole edge are taken, which increases the empty ship weight of the ship, affects the economy and energy consumption of ship loading and operation, and also increases the specifications of steel plates and the amount of welding between steel plates of different thicknesses, which is not conducive to ship construction and cost control.
[0004] In the actual design process of ship engineering projects, cable, pipe and structure design belong to three disciplines respectively. Each discipline lacks unified and detailed hole opening principles and methods. Often, a large amount of professional coordination and repeated design are caused because the holes do not meet the structural strength requirements, delaying the progress of ship design. Utility Model Content
[0005] In order to solve the above technical problems, the utility model discloses a deck beam opening arrangement structure for a car roll-on / roll-off ship, which constrains the position and type parameters of the openings before the cable and pipe installation holes are opened, thereby reducing the weakening of the structural strength and the use of local thickened plates, thereby improving the safety of the ship structure, controlling the empty ship weight and reducing the specifications of the steel plates.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] A deck beam opening arrangement structure for a car ro-ro ship comprises a deck beam, double rows of pillars for connecting multi-layer decks, side main ribs and a plurality of longitudinals connected to the deck beam and arranged perpendicular to the deck beam, wherein the plurality of longitudinals are arranged at intervals along the length direction of the beam, the double rows of pillars are symmetrically located on both sides of the ship centerline, the deck beam is divided into symmetrical left and right parts with the ship centerline as the boundary, the position of the deck beam at the ship centerline is defined as a starting point O, the intersections of the deck beam and the pillars on both sides are defined as point A, the intersections of the deck beam and the side main ribs on both sides are defined as end points B, the first to nth longitudinals located between the starting point O and point A and in the direction from the starting point O to point A are numbered a1, a2, a3, ... an in sequence, and the first to mth longitudinals located between point A and point B and in the direction from point A to point B are numbered b1, b2, b3, ... ...bm, the deck beam is divided into four types of areas according to the intervals represented by the longitudinal bone numbers, the first type of area is the interval range of the longitudinal bone numbers a(n-1) to b2, the second type of area is the interval range of the longitudinal bone numbers b(m-1) to point B, the third type of area is the three interval ranges of the starting point O to a(n-6), a(n-3) to a(n-1), and b5 to b(m-4), and the fourth type of area is the three interval ranges of the longitudinal bone numbers a(n-6) to a(n-3), b2 to b5, and b(m-4) to b(m-1); no opening is set in the first type of area, a circular hole with a diameter less than 1 / 4 of the height of the web of the beam is set in the second type of area, a circular hole and a waist circular hole are set in the third type of area, and a circular hole and a waist circular hole are set in the fourth type of area, and the size of the circular hole and the waist circular hole in the fourth area is larger than that of the circular hole and the waist circular hole in the third type of area.
[0008] Furthermore, the distance between the lower inner side surface of the circular hole opened in the second type area and the lower end surface of the beam is d2, the web height of the deck beam is h, and the relationship between d2 and h should satisfy 1 / 2h>d2>1 / 3h.
[0009] Furthermore, the circular hole opened in the second type area is located in the center of the deck beam.
[0010] Furthermore, the diameter of the circular hole opened in the said third type area is c3, the length of the waist circular hole is l3, the height is h3, the height of the web of the deck beam is h, the distance between the lower inner side surfaces of the circular hole and the waist circular hole and the lower end surface of the beam is d3, the relationship between c3 and h satisfies c3<2 / 5h, the relationship between h3 and h satisfies h3<2 / 5h, the relationship between l3 and h3 satisfies l3<2h3, and the relationship between d3 and h satisfies 1 / 3h>d3>1 / 4h.
[0011] Furthermore, the circular holes and waist-circular holes opened in the third category area are located in the middle of the deck beam.
[0012] Furthermore, the diameter of the circular hole opened in the said fourth category area is c4, the length of the waist circular hole is l4, the height is h4, the height of the web of the deck beam is h, the distance between the lower inner side surfaces of the circular hole and the waist circular hole and the lower end surface of the beam is d4, the relationship between c4 and h satisfies c4<1 / 2h, the relationship between h4 and h satisfies h4<1 / 2h, the relationship between l4 and h4 satisfies l4<3h4, and the relationship between d4 and h satisfies 1 / 3h>d4>1 / 4h.
[0013] Furthermore, the circular holes and waist-circular holes opened in the fourth type of area are located in the middle of the deck beam.
[0014] The opening arrangement structure of the deck beam of the car roll-on / roll-off ship in the utility model can constrain the opening area and hole pattern in advance before the installation of the pipe and electrical pipeline, which can greatly reduce the weakening of the deck beam structure strength caused by the opening and improve the structural safety; it can reduce the use of local thickened plates at the opening position, thereby reducing the empty ship weight and improving the ship's operating economy and energy efficiency indicators; it can reduce the specifications of steel plates and the amount of welding caused by the assembly of steel plates of different thicknesses, thereby reducing the construction difficulty and cost. In addition, the ship electrical equipment design profession and the piping system design profession carry out cable and pipe layout according to this principle and plan, avoiding repeated design caused by unsatisfactory strength assessment of the later structure opening, which can improve design efficiency and shorten the ship design cycle. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of a typical cross-sectional profile of a ro-ro ship described in the present utility model.
[0016] Figure 2 yes Figure 1 A view of the beam structure installed on deck 10 on the starboard side of the ship along the length of the ship, with a series of openings arranged in the beam structure.
[0017] Figure 3 According to the utility model method Figure 2 Schematic diagram of the arrangement and optimized type of openings on the beam structure.
[0018] Figure 4 It is for Figure 2 Arrangement of openings on the beam structure and results of type strength calculations.
[0019] Figure 5 It is for Figure 3 Arrangement of openings on the beam structure and results of type strength calculations.
[0020] Among them, 1-deck, 2-deck beam, 3-column, 4-starboard side main rib, 5-, 6-longitudinal bone, 7-port side main rib, 11-first opening, 12-second opening, 21-third opening, 22-fourth opening, 31-fifth opening, 32-sixth opening. DETAILED DESCRIPTION
[0021] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] like Figure 1 As shown, a deck beam opening arrangement structure of a car ro-ro ship comprises a deck beam 1, a double row of pillars 3 for connecting multiple decks, a starboard side main rib 4, a port side main rib 7, and a plurality of longitudinals connected to the deck beam 1 and arranged perpendicular to the deck beam 1, wherein the plurality of longitudinals are arranged at intervals along the length direction of the deck beam 1, the double row of pillars 3 are symmetrically located on both sides of the ship's centerline, and the deck beam 1 is divided into symmetrical left and right structures with the ship's centerline as the boundary.
[0023] like Figure 2 As shown in the figure, the starting point O is defined as the deck beam at the centerline, the intersection of the deck beam and the pillar is defined as point A, the intersection of the deck beam and the side main frame is defined as the end point B, the first longitudinal bone arranged perpendicular to the deck beam from the starting point O to point A is defined as a1, and the 11 longitudinal bones from O to A are numbered a1, a2, a3...a11; the first longitudinal bone arranged perpendicular to the deck beam from point A to point B is defined as b1, and the longitudinal bones from A to point B are numbered a1, a2, a3...a11. The 12 longitudinal bones between point B are numbered b1, b2, b3...b12, and the deck beam is divided into 4 areas according to the intervals represented by the longitudinal bone numbers. The first area corresponds to the interval range of longitudinal bone numbers a10~b2, the second area is the interval range of longitudinal bone numbers b11~point B; the third area is the three interval ranges of starting point O~a5, a8~a10 and b5~b8; the fourth area is the three interval ranges of longitudinal bone numbers a5~a8, b2~b5 and b8~b11.
[0024] like Figure 2As shown, exemplarily, a series of openings are opened on the deck beam, the first opening 11 is a waist-round hole with a length of 420 mm, a width of 140 and an aspect ratio of 3:1; the second opening 12 is a waist-round hole with a length of 280 mm, a width of 140 and an aspect ratio of 2:1; the third opening 21 is a waist-round hole with a length of 400 mm, a width of 150 and an aspect ratio of 2.67:1; the fourth opening 22 is a waist-round hole with a length of 270 mm, a width of 120 mm and an aspect ratio of 2.25:1; the fifth opening 31 is a circular hole with a diameter of 60 mm; the sixth opening 32 is located in the second type of area, the first opening 11 and the third opening 21 are located in the third type of area, and the second opening 12, the fourth opening 22 and the fifth opening 31 are located in the fourth type of area.
[0025] like Figure 3 As shown, illustratively, the hole arrangement is adjusted and optimized according to the method of the utility model. After the adjustment, the fifth opening 31 is located in the second type of area, the second opening 12 and the fourth opening 22 are located in the third type of area, and the first opening 11, the third opening 21 and the sixth opening 32 are located in the fourth type of area.
[0026] like Figures 4-5 As shown, after adjusting and optimizing the opening arrangement according to the method of the utility model, all the openings meet the strength requirements, and the stresses of the first opening 11, the third opening 21 and the sixth opening 32 are significantly reduced, effectively avoiding local thickening of the structure for reinforcement.
[0027] The design method of the deck beam opening arrangement and type of the utility model can greatly reduce the weakening of the deck beam structural strength caused by the openings, thereby improving the structural safety; it can reduce the use of local thickened plates at the opening positions, thereby reducing the empty ship weight and improving the ship's operating economy and energy efficiency indicators; it can reduce the specifications of steel plates and the amount of welding caused by assembling steel plates of different thicknesses, thereby reducing construction difficulty and cost.
[0028] A person skilled in the art should understand that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A deck beam opening arrangement structure for a car ro-ro ship, comprising a deck beam, double rows of pillars for connecting multiple decks, side main ribs, and a plurality of longitudinals connected to the deck beam and arranged perpendicular to the deck beam, wherein the plurality of longitudinals are arranged at intervals along the length direction of the beam, and double rows of columns are symmetrically located on both sides of the ship's centerline, characterized in that: The deck beam is divided into two symmetrical parts, the left and the right, with the centerline as the boundary. The position of the deck beam at the centerline is defined as the starting point O, the intersection of the deck beam and the pillars on both sides is defined as point A, and the intersection of the deck beam and the main ribs on the left and right sides is defined as end point B. The 1st to nth longitudinals located between the starting point O and point A and from the starting point O to point A are numbered a1, a2, a3...an in sequence, and the 1st to mth longitudinals located between point A and point B and from point A to point B are numbered b1, b2, b3...bm in sequence. The deck beam is divided into four types of areas according to the intervals represented by the longitudinal numbers. The interval range of longitudinal numbers a(n-1) to b2 is the first type. Area, the interval range of longitudinal bone number b(m-1) to point B is the second category area, the third category area is the three intervals of starting point O to a(n-6), a(n-3) to a(n-1), and b5 to b(m-4), and the fourth category area is the three intervals of longitudinal bone number a(n-6) to a(n-3), b2 to b5, and b(m-4) to b(m-1); no openings are set in the first category area, a circular hole with a diameter less than 1 / 4 of the height of the web of the crossbeam is opened in the second category area, a circular hole and a waist circular hole are opened in the third category area, and a circular hole and a waist circular hole are opened in the fourth category area. The size of the circular holes and waist circular holes in the fourth area is larger than that of the circular holes and waist circular holes in the third category area.
2. The arrangement structure of openings on the deck beam of a car ro-ro ship according to claim 1, characterized in that: The distance between the lower inner side surface of the circular hole opened in the said second type area and the lower end surface of the beam is d2, the web height of the deck beam is h, and the relationship between d2 and h should satisfy 1 / 2h>d2>1 / 3h.
3. The arrangement structure of openings on the deck beam of a car ro-ro ship according to claim 2, characterized in that: The circular hole formed in the second type area is located in the center of the deck beam.
4. The arrangement structure of openings on the deck beam of a car ro-ro ship according to claim 1, characterized in that: The diameter of the circular hole opened in the said third type of area is c3, the length of the waist circular hole is l3, the height is h3, the height of the web of the deck beam is h, the distance between the lower inner side surfaces of the circular hole and the waist circular hole and the lower end surface of the beam is d3, the relationship between c3 and h satisfies c3<2 / 5h, the relationship between h3 and h satisfies h3<2 / 5h, the relationship between l3 and h3 satisfies l3<2h3, and the relationship between d3 and h satisfies 1 / 3h>d3>1 / 4h.
5. The arrangement structure of openings on the deck beam of a car ro-ro ship according to claim 4, characterized in that: The circular holes and waist-circular holes opened in the third category area are located in the middle of the deck beam.
6. The arrangement structure of openings on the deck beam of a car ro-ro ship according to claim 1, characterized in that: The diameter of the circular hole opened in the said fourth category area is c4, the length of the waist circular hole is l4, the height is h4, the height of the web of the deck beam is h, the distance between the lower inner side surfaces of the circular hole and the waist circular hole and the lower end surface of the beam is d4, the relationship between c4 and h satisfies c4<1 / 2h, the relationship between h4 and h satisfies h4<1 / 2h, the relationship between l4 and h4 satisfies l4<3h4, and the relationship between d4 and h satisfies 1 / 3h>d4>1 / 4h.
7. The arrangement structure of openings on the deck beam of a car ro-ro ship according to claim 6, characterized in that: The circular holes and waist-circular holes opened in the fourth category area are located in the middle of the deck beam.