A high rigidity anti-bias load towing sheathing bracket structure

Abstract

The utility model discloses a kind of anti-bias load high rigidity's towboat fender bracket structure, including bracket arc plate, upper panel and lower panel, further include at least one group of middle frame and horizontal batten reinforcing rib;The middle frame is vertically fixed in the web middle part of knee board along the arrangement direction of bracket arc plate, the top of middle frame is fixedly connected with the bottom of upper panel, the bottom of middle frame is fixedly connected with the top of lower panel;The horizontal batten reinforcing rib is fixed on the inner side wall of bracket arc plate along the arrangement direction of bracket arc plate and is fixedly connected with the web of knee board;The middle frame connects independent knee board into a whole force unit in its web middle part, forms solid internal framework, when bracket bears oblique top push etc eccentric load, this frame can force all knee board to work cooperatively, resist torsional deformation together, to greatly improve the overall torsional rigidity and shear capacity of whole bracket structure.

Description

Technical Field

[0001] This utility model relates to the field of marine equipment technology, specifically to a tugboat fender bracket structure with high rigidity and resistance to eccentric loading. Background Technology

[0002] The existing port tugboat bow fender bracket mainly comprises: an arc-shaped support plate along the bow's curved contour, an upper panel, a lower panel, and multiple vertically arranged bow elbow plates (or bulkheads, stiffeners). The arc-shaped support plate directly supports the O-ring rubber fender; the upper and lower panels form the top and bottom of the bracket, respectively; the inner edge of the bow elbow plate is welded to the hull hull plating, while the outer edge is welded and fixed to the arc-shaped support plate, upper panel, and lower panel, together forming a box-type support structure to distribute the thrust transmitted by the fender to the main hull structure.

[0003] However, finite element analysis studies have shown that this traditional structure has the following significant drawbacks: (1) Stress concentration problem: When subjected to local or overall loads, the maximum stress of the structure is concentrated at the welded connection between the arc support plate and each elbow plate. As a key force transmission node, this area is difficult to effectively diffuse the load to the adjacent elbow plates, resulting in excessive local stress and becoming a weak link in the structure. Under long-term operation, it is prone to fatigue damage.

[0004] (2) Insufficient resistance to eccentric loads: When simulating the oblique jacking operation of the tugboat (i.e., bearing eccentric loads), the stress on the bow side of the bracket is much higher than that under the normal jacking condition due to the relatively weak local stiffness of the geometry. This indicates that the existing structure is not strong enough to resist torsion and shear, and there are safety hazards under complex eccentric load operations.

[0005] To address the aforementioned issues, existing technologies have yielded improved solutions, such as the one described in patent publication number CN208007242U. This solution involves creating stress-relief holes in the partition plates (i.e., elbow plates) and redesigning the arc-shaped support plate into a straight line at an angle of 25-30 degrees to the horizontal, while also incorporating reinforcing materials. While this solution alleviates stress concentration to some extent, its optimization methods are primarily limited to modifying local lines and reinforcing individual partition plates. It fails to fundamentally address the problem of connecting the individual elbow plates into a unified load-bearing frame, nor does it utilize trusses or other structures to specifically enhance the overall torsional stiffness of the support under eccentric loads.

[0006] Therefore, when facing complex working conditions such as oblique jacking, the existing structure's resistance to eccentric loads and overall stiffness are still insufficient. To fundamentally solve this problem, there is an urgent need for a new tugboat fender bracket structure that can effectively resist eccentric loads and has high stiffness. Utility Model Content

[0007] The technical problem to be solved by this utility model is to address the shortcomings of the prior art by providing a high-rigidity tugboat fender bracket structure that is resistant to eccentric loads. This structure addresses the problems of stress concentration at the elbow plate connection of the fender bracket, insufficient overall torsional stiffness when subjected to eccentric loads such as oblique jacking, and the tendency to generate excessive stress in the bow area.

[0008] The technical problem to be solved by this utility model is achieved through the following technical solution: a tugboat fender bracket structure with high rigidity and resistance to eccentric loads, including a bracket arc plate, an upper plate and a lower plate. The bracket arc plate abuts against the ship's fender through a pad. One side of the upper plate and the lower plate is fixed to the hull, and the other side is fixed to the top and bottom of the bracket arc plate by round steel bars. Several elbow plates are fixed between the upper plate and the lower plate. The elbow plates are spaced apart along the arrangement direction of the bracket arc plate. It also includes at least one set of central frame and horizontal plate reinforcing ribs. The middle frame is vertically fixed to the middle of the web of the elbow plate along the arrangement direction of the bracket arc plate. The top of the middle frame is fixedly connected to the bottom of the upper panel, and the bottom of the middle frame is fixedly connected to the top of the lower panel. The horizontal reinforcing ribs are fixed to the inner wall of the bracket arc plate along the arrangement direction of the bracket arc plate and are fixedly connected to the web plate of the elbow plate.

[0009] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the above-mentioned anti-eccentric load high rigidity tugboat fender bracket structure has a material reduction hole in the middle of the middle frame.

[0010] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the above-mentioned anti-eccentric load high rigidity tugboat fender bracket structure, wherein the material reduction hole is one of a circle, an ellipse or a triangle.

[0011] The technical problem to be solved by this utility model can also be achieved through the following technical solution: the above-mentioned anti-eccentric load high rigidity tugboat fender bracket structure has two sets of the middle frame and the horizontal plate reinforcing ribs respectively. Each set of the horizontal plate reinforcing ribs is provided on the inner side of the bracket arc plate opposite to the middle frame.

[0012] Compared with the prior art, the beneficial technical effects of this utility model are: (1) The central frame connects the independent elbow plates in the middle of its web into an integral load-bearing unit, forming a solid internal skeleton. When the bracket is subjected to eccentric loads such as oblique jacking, this frame can force all elbow plates to work together to resist torsional deformation, thereby greatly improving the overall torsional stiffness and shear resistance of the entire bracket structure. In particular, the weak area on the bow side effectively solves the stress concentration problem caused by "local weak stiffness", significantly improving operational safety and structural reliability.

[0013] (2) The middle frame is set at the mid-span of the elbow plate, which is equivalent to effectively shortening the free support length of the elbow plate. This design significantly improves the out-of-plane bending stiffness and buckling stability of each elbow plate, making them less deformed and more stable when bearing loads, thus optimizing the mechanical properties of the structure from the basic level.

[0014] (3) The reinforcing ribs are set along the inner side wall of the bracket arc plate and connect all the elbow plates in the key stress area. This is equivalent to adding a "reinforcing ring" behind the arc plate and elbow plate welding area where the stress is most concentrated. It can directly transfer and distribute the local load (especially the ballast load) to multiple adjacent elbow plates, avoiding excessive stress concentration at a single welding node, thereby effectively reducing the risk of fatigue damage. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the tugboat fender bracket structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 This is a side view of the structure of this utility model; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at point BB; Figure 6 This is a schematic diagram of the main structure of an existing tugboat fender bracket.

[0016] Reference numerals: 1. Bracket arc plate; 2. Top panel; 3. Bottom panel; 4. Pad plate; 5. Ship fender; 6. Elbow plate; 7. Mid-frame; 8. Horizontal plate reinforcing rib; 9. Subtractive material hole. Detailed Implementation

[0017] The specific technical solutions of this utility model are further described below with reference to the accompanying drawings, so as to enable those skilled in the art to further understand this utility model, without constituting a limitation on its rights.

[0018] Example 1, referring to Figure 1-6 A high-rigidity tugboat fender bracket structure with anti-eccentric load includes a bracket arc plate 1, an upper panel 2, and a lower panel 3. The bracket arc plate 1, upper panel 2, and lower panel 3 are existing technologies, so their specific positions and structures will not be described here. Their specific dimensions can be selected according to the usage requirements. The bracket arc plate 1 abuts against the ship's fender 5 through a pad 4. The size and specifications of the pad 4 can be selected according to the usage requirements, and its material can be a polymer material with certain wear resistance. One side of the upper panel 2 and the lower panel 3 is fixed to the hull, and the other side is fixed to the top and bottom of the bracket arc plate 1 by round steel bars. Several elbow plates 6 are fixed between the upper panel 2 and the lower panel 3. The elbow plates 6 are existing elbow plate 6 structures, and their size and specifications can be selected according to the usage requirements. The elbow plates 6 are spaced along the arrangement direction of the bracket arc plate 1. It also includes at least one set of central frame 7 and horizontal plate reinforcing ribs 8. The middle frame 7 is vertically fixed to the middle of the web of the elbow plate 6 along the arrangement direction of the bracket arc plate 1. The top of the middle frame 7 is fixedly connected to the bottom of the upper panel 2, and the bottom of the middle frame 7 is fixedly connected to the top of the lower panel 3. The middle frame 7 can enhance the structural strength and connection stability between the bracket arc plate 1, the upper panel 2 and the lower panel 3. A subtractive hole 9 is provided in the middle of the middle frame 7. The subtractive hole 9 is one of a circle, an ellipse or a triangle, which can be selected according to the usage requirements. The horizontal plate reinforcing rib 8 is fixed on the inner side wall of the bracket arc plate 1 along the arrangement direction of the bracket arc plate 1 and is fixedly connected to the web of the elbow plate 6. The installation direction of the horizontal plate reinforcing rib 8 is parallel to the installation direction of the bracket arc plate 1, and it serves as a horizontal reinforcing member connecting multiple elbow plates 6. To further enhance structural stability, the central frame 7 and the horizontal plate reinforcing ribs 8 are provided in two sets, with each set of horizontal plate reinforcing ribs 8 on the inner side of the bracket arc plate 1 directly opposite the central frame 7.

[0019] The high-rigidity tugboat fender bracket structure with anti-eccentric load in Example 1 can form an integral whole with the elbow plate 6 through the added central frame 7 to resist torsion and eccentric load. This is the key to solving the most dangerous working condition of oblique jacking. The horizontal plate reinforcing rib 8 serves as a horizontal reinforcement for multiple elbow plates 6, mainly to solve the problem of stress concentration. The combination of the central frame 7 and the horizontal plate reinforcing rib 8 solves two technical problems at the same time: the torsional stiffness of oblique jacking and the local stress concentration of the elbow plate 6, which significantly improves the safety of operation and the reliability of the structure.

Claims

1. A high-rigidity tugboat fender bracket structure with resistance to eccentric loading, comprising a bracket arc plate, an upper panel, and a lower panel. The bracket arc plate abuts against the ship's fender via a pad. One end of the upper and lower panels is fixed to the hull, and the other end is fixed to the top and bottom of the bracket arc plate by round steel bars. Several elbow plates are fixed between the upper and lower panels, and the elbow plates are spaced apart along the arrangement direction of the bracket arc plate. The structure is characterized by: It also includes at least one set of central frame and horizontal veneer reinforcement; The middle frame is vertically fixed to the middle of the web of the elbow plate along the arrangement direction of the bracket arc plate. The top of the middle frame is fixedly connected to the bottom of the upper panel, and the bottom of the middle frame is fixedly connected to the top of the lower panel. The horizontal reinforcing ribs are fixed to the inner wall of the bracket arc plate along the arrangement direction of the bracket arc plate and are fixedly connected to the web of the elbow plate.

2. The tugboat fender bracket structure with high rigidity and resistance to eccentric loading according to claim 1, characterized in that: A material reduction hole is provided in the middle of the central frame.

3. The tugboat fender bracket structure with high rigidity and resistance to eccentric loading according to claim 2, characterized in that: The subtractive hole is one of a circle, an ellipse, or a triangle.

4. The tugboat fender bracket structure with high rigidity and resistance to eccentric loading according to claim 1, characterized in that: The central frame and the horizontal plate reinforcing ribs are provided in two sets, and each set of horizontal plate reinforcing ribs is provided on the inner side of the bracket arc plate directly opposite the central frame.

Images