Semi-submersible platform cross arm structure for improving wave slamming resistance

Abstract

The utility model relates to a semi-submersible platform cross arm structure for improving wave slamming resistance. The cross arm structure comprises an upper side contour surface and a lower side contour surface in the vertical direction. Wherein the shapes of the upper side contour surface and the lower side contour surface in the cross section are a first arc line and a second arc line respectively, the curvature of the second arc line is larger than that of the first arc line, and the curvature of the second arc line is larger than that of the first arc line through design. According to the cross brace, the cross brace is arranged on the lower profile surface, so that waves can flow through the two sides of the cross brace more easily when slamming the lower profile surface of the cross brace, the slamming bearing area is reduced, the slamming load borne by the lower profile surface is reduced, the pressure resistance and the impact resistance of the lower profile surface are improved, and the slamming load resisting performance of the cross brace is improved while the weight of the cross brace structure is not obviously increased.

Description

Technical Field

[0001] The utility model relates to the technical field of ocean engineering, in particular to a semi-submersible platform cross brace structure for improving the anti-wave slamming ability. Background Art

[0002] With the continuous development of marine resource development equipment technology, semi-submersible platforms have become important equipment for marine resource development. Under certain sea conditions and working conditions, semi-submersible platforms are affected by wave slamming loads. The action time of wave slamming is short, and its nonlinear characteristics are extremely significant. Under the action of waves, some structures of the semi-submersible platform repeatedly enter and exit the water. During this process, a violent collision occurs at the moment when the structure contacts the wave surface, generating a very large slamming load.

[0003] In related technologies, the cross braces of semi-submersible platforms are connected to the columns on the left and right sides, mainly used to resist the lateral separation loads suffered by the platform in waves. However, the wave slamming load has a great impact on semi-submersible platforms. Especially for slender structures like cross braces, they are more likely to be damaged under the action of slamming loads.

[0004] Therefore, it is necessary to develop a new type of semi-submersible platform cross brace structure to improve some of the above problems existing in related technologies. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a semi-submersible platform cross brace structure for improving the anti-wave slamming ability, which can enhance its ability to withstand slamming loads when the cross brace repeatedly enters and exits the water surface.

[0006] The purpose of the utility model can be achieved by the following technical solutions:

[0007] The cross brace structure provided by the utility model includes an upper contour surface and a lower contour surface in the vertical direction; the shapes of the upper contour surface and the lower contour surface in the cross section of the cross brace structure are a first arc and a second arc respectively, and the curvature of the second arc is greater than that of the first arc.

[0008] Optionally, the first arc and the second arc combine to form a closed curve.

[0009] Optionally, the closed curve is egg-shaped.

[0010] Optionally, the shape of the second arc is a part of an ellipse, and the second arc is formed by the ellipse being intercepted by its minor axis.

[0011] Optionally, the shape of the first arc is a part of an ellipse, and the eccentricity of the first arc is less than that of the second arc.

[0012] Optionally, the first arc is a semi-circle or a partial ellipse, and the radius of the first arc or the length of the minor axis of the ellipse is equal to the length of the minor axis of the second arc.

[0013] Optionally, the cross brace structure is a hollow structure, and the inner surface profile of the hollow structure corresponds to the shape of the outer contour surface.

[0014] Optionally, the cross brace structure further includes a cross brace outer plate that covers the upper contour surface and the lower contour surface. Reinforcing ribs are provided along the axial direction and the circumferential direction on the inner side of the cross brace outer plate, and the reinforcing ribs abut against the upper contour surface and the lower contour surface.

[0015] Optionally, the cross brace structure further includes a cross brace outer plate, which includes a first plate segment and a second plate segment. The first plate segment covers the middle area of the upper contour surface and the lower contour surface, and the second plate segment covers the end areas of the upper contour surface and the lower contour surface. The thickness of the first plate segment is less than the thickness of the second plate segment.

[0016] The utility model provides a semi-submersible platform, which includes a cross brace and columns. The end of the cross brace includes an insertion plate for inserting into the interior of the columns.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. In the utility model, the curvature of the second arc in the cross section of the cross brace is greater than that of the first arc, so that when the wave surface slams against the lower contour surface of the cross brace, it is easier to flow through both sides of the cross brace, reducing the area subjected to the slam, reducing the resistance of the liquid when the lower contour surface is slammed, and being beneficial to improving the performance of the cross brace against slamming loads.

[0019] 2. By setting the shape of the cross section of the cross brace as an egg shape in the utility model, the contour surface of the cross brace forms a structural form that conforms to the multi-focus positive Gaussian curve, having a high strength-to-weight ratio, a more streamlined shape, and a reasonable material distribution, obtaining better pressure resistance and impact resistance performance, and being beneficial to improving the performance of the cross brace against slamming loads.

[0020] 3. By designing the shape of the first arc as a partial ellipse in the utility model, the eccentricity of the first arc is greater than that of the second arc, realizing that the curvature of the second arc is greater than that of the first arc, and improving the performance of the cross brace against slamming loads.

[0021] 4. In the present utility model, by making the length of the minor axis of the ellipse of the second arc equal to the radius of the first arc or the length of the minor axis of the ellipse, without reducing the size of the upper profile surface of the cross brace, it is possible to maintain or increase the expected design moment of inertia and shear area of the cross brace structure while not significantly increasing the weight of the cross brace structure, and to achieve the strength stability and hydrodynamic characteristics that meet the requirements, and have low sensitivity to structural defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic view of a semi-submersible platform in an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 a schematic vertical sectional structure view of the cross brace and the column shown;

[0024] Figure 3 is Figure 1 a schematic top horizontal sectional structure view of the cross brace and the column shown;

[0025] Figure 4 is Figure 1 a schematic cross-sectional structure view of the cross brace without horizontal and vertical partitions shown;

[0026] Figure 5 is Figure 1 a schematic cross-sectional structure view of the cross brace with horizontal and vertical partitions provided therein shown;

[0027] Figure 6 is a schematic view of the cross brace structure profile in the first type of embodiment;

[0028] Figure 7 is a schematic view of the cross brace structure profile in the second type of embodiment;

[0029] Figure 8 is a schematic view of the cross brace structure profile in the third type of embodiment;

[0030] Figure 9 is a schematic view of the cross brace structure profile in the fourth type of embodiment;

[0031] Figure 10 is a schematic view of the cross brace structure profile in the fifth type of embodiment.

[0032] REFERENCE MARKS:

[0033] 1. Cross brace; 101. First arc; 102. Second arc; 103. Broken line; 201. First middle line segment; 202. Second middle line segment; 3. Minor axis of the ellipse; 501. Horizontal partition; 502. Vertical partition; 6. Cross brace outer plate; 601. First plate segment; 602. Second plate segment; 7. Connecting elbow plate; 8. Column; 9. Hollow area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The present utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and provides a detailed implementation manner and specific operation process, but the protection scope of the present utility model is not limited to the following embodiments.

[0035] Figure 1 It is a schematic structural diagram of a semi-submersible platform in an embodiment of the present utility model; Figure 2 is Figure 1 a schematic vertical sectional structure diagram of the cross brace and the column shown.

[0036] An embodiment of the present utility model also provides a semi-submersible platform. Referring to Figure 1 and Figure 2 , the semi-submersible platform includes a cross brace 1 and a column 8. The cross brace 1 connects adjacent columns 8, and the end of the cross brace 1 includes an insertion plate for inserting into the interior of the column.

[0037] Figure 6 It is a schematic diagram of the cross brace profile in the first type of embodiment.

[0038] An embodiment of the present utility model provides a cross brace structure, Figure 2 and Figure 6 , the cross brace structure includes an upper side profile and a lower side profile in the vertical direction; wherein, the shapes of the upper side profile and the lower side profile in the cross section of the cross brace are a first arc 101 and a second arc 102 respectively, and the curvature of the second arc 102 is greater than the curvature of the first arc 101.

[0039] In some specific embodiments, the vertical direction is perpendicular to the sea level direction.

[0040] In some embodiments of the present utility model, referring to Figure 6 , the first arc 101 and the second arc 102 combine to form a closed curve.

[0041] Figure 10 It is a schematic diagram of the cross brace structure profile in the fifth type of embodiment.

[0042] In some other embodiments of the present utility model, referring to Figure 10 , the cross brace 1 further includes a middle profile. The shape of the middle profile in the cross section of the cross brace 1 is a first middle line segment 201 and a second middle line segment 202. The two ends of the first middle line segment 201 and the second middle line segment 202 are respectively connected to the first arc 101 and the second arc 102. The first arc 101, the second arc 102, the first middle line segment 201 and the second middle line segment 202 combine to form the closed curve.

[0043] Specifically, referring to Figure 10 , the first middle line segment 201 and the second middle line segment 202 may be straight line segments.

[0044] In some embodiments of the present utility model, referring to Figure 6 , the closed curve is egg-shaped.

[0045] Figure 8 It is a schematic diagram of the cross-sectional profile of the cross brace structure in the third type of embodiment.

[0046] In other embodiments of the present utility model, referring to Figure 8 , the closed curve is oval.

[0047] In some embodiments of the present utility model, referring to Figures 6 to 10 , the shape of the second arc 102 is a partial ellipse, and the second arc 102 is formed by the ellipse being intercepted by its minor axis 3.

[0048] Figure 7 It is a schematic diagram of the cross-sectional profile of the cross brace structure in the second type of embodiment.

[0049] In some specific embodiments, the second arc 102 is a shape obtained by intercepting an ellipse with a straight line.

[0050] In some specific embodiments, referring to Figure 7 , the second arc 102 may be formed by the ellipse being intercepted by its minor axis 3, the second arc 102 is a semi-ellipse, and the length of the second arc 102 in the direction of the major axis of the ellipse is equal to the semi-major axis length of the ellipse.

[0051] In other specific embodiments, the second arc 102 may be formed by intercepting an ellipse with a straight line parallel to its minor axis 3, the second arc 102 is a partial ellipse, and the length of the second arc 102 in the direction of the major axis of the ellipse is less than the semi-major axis length of the ellipse.

[0052] Figure 9 It is a schematic diagram of the cross-sectional profile of the cross brace structure in the fourth type of embodiment.

[0053] In other specific embodiments, referring to Figure 9 , the shape of the upper side profile in the cross-section of the cross brace 1 may be a broken line 103, including but not limited to a triangle, a rectangle, a pentagon, or a hexagon, etc.

[0054] In some embodiments of the present utility model, referring to Figure 7 , the shape of the first arc 101 is a partial ellipse, and the eccentricity of the first arc 101 is less than the eccentricity of the second arc 102.

[0055] Specifically, referring toFigure 7 The eccentricity of the first arc 101 is less than that of the second arc 102, so that the bottom curvature of the second arc 102 is greater than the top curvature of the first arc 101.

[0056] In some specific embodiments, the difference in eccentricity between the first arc 101 and the second arc 102 is relatively large. For example, the eccentricity of the first arc 101 can be closer to zero, and the eccentricity of the second arc 102 can be closer to one, so that the shape of the first arc 101 is closer to a semi-circle, and the shape of the second arc 102 is flatter, in order to obtain better structural strength and anti-slamming ability.

[0057] In some embodiments of the present invention, the first arc 101 is a semi-circle or a partial ellipse, and the radius of the first arc 101 or the length of the minor axis 3 of the ellipse is equal to the length of the minor axis 3 of the second arc 102.

[0058] In some specific embodiments, referring to Figure 6 , the first arc 101 can be a semi-circle formed by intercepting a circle with its radius, the second arc 102 can be a partial ellipse formed by intercepting an ellipse with its minor axis 3, the radius of the circle is equal to the length of the minor axis 3 of the ellipse, and the first arc 101 and the second arc 102 are combined to form the closed curve in a manner that the radius and the minor axis 3 coincide.

[0059] In some other specific embodiments, referring to Figure 7 , the first arc 101 can be a partial ellipse formed by intercepting an ellipse with its minor axis 3, the second arc 102 can be a partial ellipse formed by intercepting an ellipse with its minor axis 3, the lengths of the minor axes 3 of the two ellipses are equal, the eccentricity of the first arc 101 is less than that of the second arc 102, and the first arc 101 and the second arc 102 are combined to form the closed curve in a manner that the two minor axes 3 coincide.

[0060] Figure 4 For Figure 1 the cross-sectional structure schematic diagram of the cross brace without horizontal and vertical partitions shown.

[0061] In some embodiments of the present invention, referring to Figure 4 , the cross brace 1 is a hollow structure, that is, the cross brace 1 includes a hollow area 9 inside, and the inner surface contour of the cross brace 1 corresponds to the shape of the outer contour surface.

[0062] Figure 5 For Figure 1 the cross-sectional structure schematic diagram of the cross brace with horizontal and vertical partitions provided inside shown.

[0063] In some specific embodiments, with reference to Figure 5 , a horizontal partition 501 and a vertical partition 502 are arranged inside the cross brace 1. The horizontal partition 501 is arranged along the minor axis 3 of the ellipse of the second arc 102, and the vertical partition 502 perpendicularly bisects the horizontal partition 501.

[0064] In some embodiments of the present utility model, the cross brace 1 further includes a cross brace outer plate 6. The cross brace outer plate 6 covers the outer surface of the cross brace 1. Reinforcing ribs are arranged on the inner side of the cross brace outer plate 6 along both the axial direction and the circumferential direction of the cross brace 1, and the reinforcing ribs abut against the outer surface of the cross brace 1.

[0065] Figure 3 For Figure 1 the schematic top view horizontal sectional structure diagram of the cross brace and the column shown.

[0066] In some embodiments of the present utility model, with reference to Figure 3 , the cross brace 1 further includes a cross brace outer plate 6. The cross brace outer plate 6 includes a first plate segment 601 and a second plate segment 602. The first plate segment 601 covers the middle area of the upper contour surface and the lower contour surface, and the second plate segment 602 covers the end areas of the upper contour surface and the lower contour surface. The thickness of the first plate segment 601 is less than the thickness of the second plate segment 602.

[0067] In some embodiments of the present utility model, with reference to Figure 2 , the cross brace 1 further includes a connecting elbow plate 7. The connecting elbow plate 7 is arranged at the connection of the upper contour surface and the lower contour surface with the column 8.

[0068] In some specific embodiments, at the connection of the upper contour surface and the lower contour surface with the column 8, the connecting elbow plates 7 are arranged along both the vertical and horizontal directions.

[0069] The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present utility model without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present application based on the concept of the present utility model through logical analysis, reasoning or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A semi-submersible platform cross brace structure for improving wave slamming resistance, characterized in that: include: An upper profile surface and a lower profile surface in a vertical direction; The shapes of the upper contour surface and the lower contour surface in the cross section are respectively a first arc line (101) and a second arc line (102), and the curvature of the second arc line (102) is greater than the curvature of the first arc line (101).

2. The cross bracing structure according to claim 1, characterized in that: The first arc (101) and the second arc (102) are combined to form a closed curve.

3. The cross bracing structure according to claim 2, characterized in that: The closed curve is egg-shaped.

4. The cross bracing structure according to claim 2, characterized in that: The shape of the second arc (102) is a partial ellipse, and the second arc (102) is formed by intercepting the ellipse by its minor axis (3).

5. The cross bracing structure according to claim 4, characterized in that: The shape of the first arc (101) is a partial ellipse, and the eccentricity of the first arc (101) is smaller than the eccentricity of the second arc (102).

6. The cross bracing structure according to claim 4, characterized in that: The first arc (101) is a semicircle or a partial ellipse, and the radius of the first arc (101) or the length of the ellipse minor axis (3) is equal to the length of the ellipse minor axis (3) of the second arc (102).

7. The cross bracing structure according to claim 1, characterized in that: The interior is a hollow structure, and the inner surface contour of the hollow structure corresponds to the shape of the outer contour surface.

8. The cross bracing structure according to claim 1, characterized in that: It also includes a transverse brace outer plate (6), which covers the upper contour surface and the lower contour surface. The inner side of the transverse brace outer plate (6) is provided with reinforcing ribs in the axial and circumferential directions, and the reinforcing ribs abut the upper contour surface and the lower contour surface.

9. The cross bracing structure according to claim 1, characterized in that: It also includes a cross-bracing outer plate (6), which includes a first plate segment (601) and a second plate segment (602), wherein the first plate segment (601) covers the middle area of ​​the upper side contour surface and the lower side contour surface, and the second plate segment (602) covers the end areas of the upper side contour surface and the lower side contour surface, and the thickness of the first plate segment (601) is less than the thickness of the second plate segment (602).

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