CN115892354A

CN115892354A - Marine crane lower reinforcing structure

Info

Publication number: CN115892354A
Application number: CN202211729792.7A
Authority: CN
Inventors: 李金伦; 马亚成; 赵文斌; 韩斌; 朱传华
Original assignee: Shanghai Merchant Ship Design and Research Institute
Current assignee: Shanghai Merchant Ship Design and Research Institute
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-04-04

Abstract

The invention relates to a lower reinforcing structure of a marine crane, wherein the crane vertically penetrates through a main deck and comprises an upper reinforcing structure of the main deck and a lower reinforcing structure of the main deck; the reinforcing structure above the main deck comprises a cross-shaped plate, the cross-shaped plate is welded and fixed on the main deck and is positioned inside the crane cylinder, and the four outer ends of the cross-shaped plate are welded and fixed with the inner wall of the crane cylinder; the free end of the upper part of the cross-shaped plate is provided with a steel panel, the reinforcing structure below the main deck comprises a crane cylinder body extending a certain distance below the main deck, and a plurality of short longitudinal girders are respectively arranged on the port and the starboard along the ship length direction, and part of the short longitudinal girders penetrate through the crane cylinder body; the lowest position of the crane cylinder body extending to a certain distance below the main deck is 1.2-2 meters away from the bottom plate of the top pier.

Description

Marine crane lower reinforcing structure

Technical Field

The invention relates to a reinforcing structure under a crane for a ship, and belongs to the technical field of ship design.

Background

The crane is mainly used for loading and unloading goods, is one of the most important devices in cargo ships, and is generally used on small bulk carriers, multipurpose ships and small container ships. For large cargo ships, the large cargo ships are generally stopped at large ports, and shore cranes are arranged on the shore to load and unload cargos; for small cargo ships, the small cargo ships sometimes stop at small ports, and some ports are not provided with hoisting devices on the shore, so that cargo loading and unloading are completed by using cranes carried by the ships. Therefore, only the ship with smaller tonnage needs to be provided with a crane to facilitate the loading and unloading of goods in a small port.

The crane has the advantages that the crane is large in size, the height can reach 20 meters, the arm length can reach 30 meters at most, the crane needs to be operated and used during loading and unloading goods, the use frequency is high, once the crane has an accident, the main ship body can be damaged, and casualties can be caused, so that the design of the crane and a reinforcing structure below the crane is paid attention to people.

When the ship is designed, in order to ensure the strength of a crane arranged on a main deck, the lower reinforcement of the crane is generally made larger, and the lower reinforcement of the crane generally extends to the position of a top pier bottom plate, so that the weight of the structure is increased, as shown in fig. 1, meanwhile, the lower reinforcement structure is dense, is not beneficial to construction in a factory, and is difficult to maintain and pass at a later stage.

Disclosure of Invention

The invention aims to provide a reinforcement structure under a crane for a ship, which adopts a new node form and arranges reinforcement members in key areas, thereby obviously reducing the stress level of structure reinforcement, simplifying the design of reinforcement under the crane, reducing the weight of reinforcement under the crane, and facilitating field construction, later maintenance and personnel passage.

The invention adopts the following technical scheme:

a crane lower reinforcing structure for a ship vertically penetrates through a main deck and comprises a main deck upper reinforcing structure and a main deck lower reinforcing structure; the reinforcing structure above the main deck comprises a cross-shaped plate 4, the cross-shaped plate 4 is fixedly welded on the main deck and is positioned inside the crane cylinder, and the four outer ends are fixedly welded with the inner wall of the crane cylinder; a steel panel 5 is arranged at the free end of the upper part of the cross-shaped plate 4, the reinforcing structure below the main deck comprises a crane cylinder body extending a certain distance below the main deck, and a plurality of short longitudinal girders are respectively arranged on the port and the starboard along the ship length direction, and part of the short longitudinal girders penetrate through the crane cylinder body; the lowest position of the crane cylinder body extending to a certain distance below the main deck is 1.2-2 meters away from the bottom plate of the top pier.

Preferably, the four outer ends of the cross-shaped plate 4 are provided with a height-rising amplification part, a circle of flat steel 6 is arranged at the height-rising amplification part along the crane cylinder, and the tops of the amplification parts of the four outer ends of the cross-shaped plate 4 are fixedly welded with the circle of flat steel 6.

Further, the enlarged portion of the height rise has a rounded chamfer.

Preferably, the edge of the flat steel 6 is welded and fixed with the inner wall of the crane cylinder.

Preferably, the crane cylinder is cylindrical.

Preferably, the middle part of the cross-shaped plate 4 is 0.2-0.5m high, and the raised amplification parts at the four outer ends are 0.4-0.8m high.

Preferably, the thickness of the cross-shaped plate 4 is 20-30mm.

The invention has the beneficial effects that: the traditional crane lower reinforcing structure is only arranged below a main deck, and no reinforcement is arranged above the main deck, so that in order to ensure that the structural strength meets the specification requirement, the components for reinforcing under encryption need to be increased.

Drawings

Figure 1 is a schematic view of a prior art crane drum traversing a main deck.

Fig. 2 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A in fig. 1.

Fig. 3 is a cross-sectional view of the reinforcing structure of the ship crane according to the present invention installed on the hull.

Fig. 4 is a schematic view of the reinforcing structure under the marine crane of the present invention. Wherein (base:Sub>A) isbase:Sub>A partial view corresponding to FIG. 3, (B) isbase:Sub>A sectional view taken along line A-A in (base:Sub>A), and (c) isbase:Sub>A sectional view taken along line B-B in (base:Sub>A).

Fig. 5 is a schematic view of the upper main deck reinforcing structure of the underslung reinforcing structure of the marine crane of the present invention.

Fig. 6 is a schematic view of the under main deck reinforcing structure of the marine crane reinforcing structure of the present invention.

FIG. 7 is a screenshot of a software interface for finite element stress analysis of the reinforced structure under the marine crane according to the present invention.

In the figure, 1 is a crane, 2 is a main deck, 3 is a top pier bottom plate, and 4 is a cross-shaped plate. 5. Panel, 6. Flat steel.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

The invention consists of two parts.

One part is reinforced above a main deck and is positioned in a crane cylinder, a cross-shaped plate 4 is arranged above the main deck, a panel 5 made of flat steel is arranged at the free end of the plate, a circle of flat steel 6 is arranged along the crane cylinder at a certain height from the main deck to avoid the problem that the cross-shaped plate 4 is directly welded to the crane cylinder to cause stress concentration, and the enlarged part of the end part of the cross-shaped plate 4 is received on the circle of flat steel 6;

the second part is reinforced below the main deck, the crane cylinder body extends for a certain distance below the main deck and is of a cylindrical structure, the size of the crane cylinder body is consistent with that of the crane cylinder body on the main deck, and in order to guarantee the strength of the structure, a short longitudinal girder can be arranged on each of the port and the starboard in the ship length direction. Fig. 3 and 4 are three-dimensional views of these two parts.

The crane cylinder body of the first part extends to a distance below the main deck, and the cross reinforcement of the first part and the lower structure reinforcement of the second part are strictly aligned, so that the effective transmission of the load can be ensured. Learn through finite element intensity computational analysis, the place that is closer to barrel and main deck connection sets up the enhancement more, can play better enhancement effect more, design in the past is all at the inside not any enhancement of barrel, but increase the length of main deck below second part barrel and realize the enhancement effect, because the extension section of second part barrel is kept away from the place that barrel and main deck are connected, the effect of so playing is not only not showing significantly, still meaninglessly increased more weight, and because the top mound inner space is narrower, inside the barrel stretches to the top mound, also be very unfavorable for construction and pass. According to the invention, the cross plate structure 4 is additionally arranged in the upper cylinder body which is close to the connection between the crane cylinder body and the main deck, so that the stress of the crane reinforcing structure can be greatly reduced, the extension length of the second part of the cylinder body (the distance from the lowest part of the crane cylinder body extending a distance below the main deck to the bottom plate of the top pier is 1.2-2 m) is effectively reduced, the requirement on strength is met, the structure weight is lighter, the structure form is simpler, and the smooth passing and the daily maintenance of a crew can be well ensured. Fig. 7 is a finite element analysis result of this reinforcement scheme, and it can be seen that the strength can be well ensured to meet the specification.

In this embodiment, the four outer ends of the cross-shaped plate 4 have a raised enlargement, a ring of flat steel 6 is arranged along the crane cylinder, and the tops of the enlargements of the four outer ends of the cross-shaped plate 4 are welded and fixed with the ring of flat steel 6. The enlarged portion of the elevation has a rounded chamfer. The edge of the flat steel 6 is welded and fixed with the inner wall of the crane cylinder.

In this embodiment, the central portion of the cross-shaped plate 4 is 0.2 to 0.5m high, and the raised enlargements of the four outer ends are 0.4 to 0.8m high. The thickness of the cross-shaped plate 4 is 20-30mm.

The invention mainly solves the problems of structural weight increase, construction inconvenience and ship using inconvenience caused by the fact that the conventional reinforcing structure under the crane is large and complex. The key point lies in that the crane barrel of main deck top is inside to add and establishes cross additional strengthening, owing to be close to the place that barrel and main deck are connected more and set up additional strengthening, can play better enhancement effect more, for only setting up additional strengthening below the main deck in the past, under the prerequisite of guaranteeing structural strength, can reduce main deck below additional strengthening's size, and then realize subtracting the effect of heavy, convenient construction. The key point of the invention is that the cross reinforcing structure is additionally arranged in the crane cylinder above the main deck.

While the preferred embodiments of the present invention have been described, those skilled in the art will appreciate that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a reinforcing structure under marine gram is hung, the gram is hung vertically and is passed main deck, its characterized in that:

the device comprises a main deck upper reinforcing structure and a main deck lower reinforcing structure;

the reinforcing structure above the main deck comprises a cross-shaped plate (4), the cross-shaped plate (4) is welded and fixed on the main deck and is positioned in the crane cylinder, and the four outer ends are welded and fixed with the inner wall of the crane cylinder; a steel panel (5) is arranged at the free end of the upper part of the cross-shaped plate (4),

the reinforcing structure below the main deck comprises a crane cylinder extending a distance below the main deck, and a plurality of short longitudinal girders are respectively arranged on the port and the starboard in the ship length direction, and part of the short longitudinal girders penetrate through the crane cylinder; the lowest position of the crane cylinder body extending to a certain distance below the main deck is 1.2-2 meters away from the bottom plate of the top pier.

2. The underslung reinforcement structure of a marine crane according to claim 1, wherein: the four outer ends of the cross-shaped plate (4) are provided with amplifying parts with the height rising, a circle of flat steel (6) is arranged at the amplifying parts with the height rising along the crane barrel, and the tops of the amplifying parts at the four outer ends of the cross-shaped plate (4) are fixedly welded with the circle of flat steel (6).

3. The underslung reinforcing structure for a marine crane of claim 2, wherein: the enlarged portion of the height rise has a rounded chamfer.

4. The underslung reinforcement structure of a marine crane according to claim 1, wherein: the edge of the flat steel (6) is welded and fixed with the inner wall of the crane cylinder.

5. The underslung reinforcement structure of a marine crane according to claim 1, wherein: the crane cylinder is cylindrical.

6. The underslung reinforcement structure of a marine crane according to claim 1, wherein: the middle part of the cross-shaped plate (4) is 0.2-0.5m high, and the raised amplifying positions at the four outer ends are 0.4-0.8m high.

7. The underslung reinforcement structure of a marine crane according to claim 1, wherein: the thickness of the cross-shaped plate (4) is 20-30mm.