SU1625769A1 - Temporary bulkhead - Google Patents

Abstract

The invention relates to devices for preventing the displacement of bulk cargoes when they are transported on ships. The purpose of the invention is to improve the operational reliability of the bulkhead. The bulkhead contains a separating panel 1 of fabric material that is installed at the bottom of the vessel and at the hold of the vessel 3 and connected to its body by means of the upper 4 and lower 5 detachable connections. The panel 1 has a cavity formed by the plates. Pneumatic cylindrical containers with automatic choke valves for air release are located in the cavities. When loading and displacing the load, annular tensions arise in the cloth, the containers are proportionally compressed, and the air pressure rises in them. When the set pressure is reached, the valves release air from the tanks, the panel lasts, the radius of its curvature decreases - this leads to a corresponding decrease in tension in the bulkhead panel 1. 2il. yo

Description

Schig.1

The invention relates to shipbuilding and fleet operation, in particular, to longitudinal temporary bulkheads established during the transport of hazardous cargoes from the point of view of displacement.

The purpose of the invention is to increase reliability in operation,

Figure 1 shows a temporary ship bulkhead with automatic tension control, a general view (the dotted line shows the position and state of the bulkhead before loading the compartment with bulk cargo, the solid line after displacing the cargo in the voyage); figure 2 - node I in figure 1.

The bulkhead contains a vertical separation plate 1. made of tissue-film materials installed in the hold 2 of the vessel 3 and connected to its hull by means of the upper detachable joint 4 and the lower detachable joint 5. The cloth 1 has cavities 6 formed by duplicate lining 7 made of similar material located on one side of the main panel 1 and attached to it by means of seams 8. In the two-layer separating panel (not shown), cavities 6 can only be formed ish seams 8, connecting the two layers of material. Each cavity 6 extends along the entire length of the panel and is arranged arbitrarily along its height. Inside the cavities 6 are inserted pneumatic cylindrical containers 9, equipped, along with valves for air supply (not shown), with automatic throttling valves 10 for air release. It is preferable to use the Equipment of Tanks 9 throttling valves of two types: automatically triggered when the set limit value of the air pressure in the tanks 9 is reached and releasing the air or only portions, or immediately in full capacity 9.

Ship pereborne works as follows.

For installation, the bulkhead is fed to the hold 2, where on the cargo deck 11 it is extended from the position in which it is stored. It is then hijacked around the upper edge of the panel 1 and, using ship or shore lifting devices, is suspended from the hull of the vessel 3 and fixed to it by means of the upper detachable connection 4. At stops during the lifting of the bulkhead or after hanging it, it is filled with air to the calculated all pressure values except one or two

the bottom ones are located on the cloth, the container 9. Then the plate 1 is attached to the hull of the vessel 3 in the lower detachable joint 5, and the remaining one or two cylindrical containers 9 are filled with air, as a result of which the panel 1 receives a slight pre-tension in cross section and occupies the position indicated in figure 1 by the dotted line, in which there are no niches in the panel at the cargo deck.

Next, loading of the hold 2 with a bulk load 12 is performed, which causes additional annular (in cross section) tension in the sheet. Capacities 9, working under tension as elastic inserts, change their cross-sectional shape, lengthening in the direction of tension, increase the length of the cross-section of the cloth, which leads to a decrease in the current ring tension in the cloth 1 due to a decrease in the radius of curvature of the transverse section. A change in the cross-sectional shape of the containers 9 leads to an increase in air pressure in them, which, when a certain critical value is reached, causes the automatic operation of the throttling valve 10 initially in one of the pneumatic cylinders, preferably in the lowest one, and the air volume output corresponding to the valve design. Preliminary calculation and adjustment of a throttling valve, which discharges air from this tank 9 not in portions, but in its entire volume, allows not only to significantly reduce the level of tension in the cloth, but after loading of hold 2 is completely removed, the existing total (preliminary plus loading ) tension in the cloth. The displacement of bulk cargo 12 in a voyage, when its free surface is flat and approximately horizontal after loading, becomes inclined on both sides of the bulkhead and different in height from panel 1 (in cross section of figure 1, this position is shown by wavy lines), causes panel new tensions: static - only because of the difference in heights of the load 12 at panel 1, and dynamic - when the vessel is rolling. These tensions are reduced in the same way as described above by increasing the length of the cross-section of the cloth 1, which is achieved due to the initial deformation due to the compression of the remaining air-filled containers 9 and the subsequent release of air from them now, for example, in portions.

With a subsequent increase in tension in the panel, the process of their automatic lowering will be repeated.

The presence on the cloth of not one but several containers, especially of different diameters, increases the reliability and performance of the proposed device, since it allows to increase not only the number of factors controlling the automatic control, but also the number of variations from them.

The release of air from one tank 9 provides for the elongation of the cross section

Lb

cloth length equal to

d 0.57d.

where d is the diameter of the tank 9, and the elongation of this section with the release of air from the containers is respectively

, 57Ј di.

i 1

Theoretical and experimental studies show that the value of D1 should not exceed 0.17H. With further lengthening, the panel loses its properties

Lv0vOORKI.

 Of condition

0.57 |

di 0.17H

dependence is determined

Ј d) O.ZN i 1

five

0

five

0

five

where n is the number of pneumatic cylindrical containers inserted into the longitudinal cavities;

d is the diameter of the i-th tank;

H - the height between the lower and upper edges of the cloth.

Claims (1)

Claims of the invention Temporary ship bulkhead containing a separating vertical cloth made of tissue-film material placed in the vessel's hold and connected to its hull by means of detachable joints, which have longitudinal cavities formed along its entire length, forming duplicate linings of tissue-film material, characterized in that. that, in order to increase reliability in operation, it is equipped with pneumatic cylindrical containers of flexible material, having throttling valves located in the said cavities of the cloth, and the number of cylindrical containers, their diameter and height between the lower and upper edges of the cloth are related by Ј di O.ZN. i i where n is the number of cylindrical containers; d is the diameter of the 1st cylindrical tank; H - the height between the lower and upper edges of the cloth. 7