JP2758123B2 - Tanker Hull Damage Prevention Device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing damage to a hull of a tanker having a hull composed of an inner plate and an outer plate.

[0002]

2. Description of the Related Art In recent years, as shown in FIG. 3, in order to prevent marine pollution, a hull 30 is constituted by an inner plate 30A and an outer plate 30B, so that a so-called double ship which makes it difficult for oil 35 to flow out to the sea W. A tanker 36 having a shell (double hull) structure has been proposed. However, in this tanker 36, only the hull 30 is composed of the inner plate 30A and the outer plate 30B, and there is no device for preventing the hull 30 from being damaged.

[0003]

In the above-mentioned tanker 36, when the outer plate 30B of the hull 30 is damaged due to grounding or the like, seawater 32 is filled in a gap (ballast tank) 31 between the inner plate 30A and the outer plate 30B. As shown in FIG. 4, the water gradually flows into the tanker, and the draft 33 of the tanker is deepened. As a result, the inner plate 30 </ b> A forming the oil tank is also damaged, and the contents such as the oil 35 in the oil tank are changed to offshore W. And may pollute the environment.

Accordingly, an object of the present invention is to provide an apparatus for preventing damage to a hull of a tanker, which can solve the above problems.

[0005]

Means for solving the problems of the present invention are as follows. A hull is composed of an inner plate and an outer plate, and a gap is formed between the inner plate and the outer plate. In a tanker provided with a partition wall for partitioning the inner plate and the outer plate together with a plurality of sections,
A pressure detector for detecting the pressure in each section, an injection device for injecting a foaming agent into the section, and a bubble generated in the injection device by a pressure reduction signal from the pressure detector due to breakage of the outer plate. And a control device having a function of outputting an agent injection signal.

[0006]

In the above construction, when a tanker lands while sailing and the outer plate is damaged, the pressure in the section corresponding to the damaged portion is reduced, the pressure detector detects the reduced pressure signal, and this signal is sent to the control device. Output, the control device outputs a blowing agent injection signal to the injection device, the blowing agent is injected into the decompressed compartment,
The foaming agent foams and fills the section corresponding to the damaged portion of the outer panel, thereby preventing seawater from entering the void.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hull damage preventing apparatus for a tanker according to the present invention will be described below with reference to FIGS. In addition,
FIG. 1 is a cross-sectional view of a tanker, and FIG. 2 is a schematic view of a hull damage prevention device.

In a tanker T according to an embodiment of the present invention, a hull 1 is composed of an inner plate 1A and an outer plate 1B.
A vertical partition wall 4 is provided for partitioning the gap 2 between A and the outer plate 1B into a number of sections 3 and connecting the inner plate 1A and the outer plate 1B to each other. In each section 3, a reinforcing longitudinal member 4a is arranged in the longitudinal direction of the hull 1.

A pressure holding device 5 for maintaining the inside of each section 3 at a constant pressure is provided.
As shown in FIG. 2, a compressor 8 installed on the hull 1, a switching valve mechanism 7 connected to the compressor 8 and connected to an output side of a control device 11 described below,
A compressed air supply pipe 6 connected to the compressor 8 via a switching valve mechanism 7 and having a supply port 6a disposed in each section 3;

A pressure detector 10 for detecting the pressure in each section 3 is attached to each section 3. An injection device 13 for injecting a foaming agent (urethane foam) 12 into each of the sections 3 is provided.
Reference numeral 3 denotes a foaming agent stock solution tank 15 arranged on a deck 14 of the hull 1 and a foaming agent supply pipe 16 connected to the foaming agent stock solution tank 15 and extended to each section 3. An opening / closing part (not shown) of a foaming agent stock solution tank 15 is connected to the output side of the outer plate 1B.
It has a function of outputting an opening signal, that is, a blowing agent injection signal to the opening / closing section of the foaming agent stock solution tank 15 in response to a pressure reduction signal from the pressure detector 10 caused by the breakage of the container.

In the above configuration, while the tanker T is traveling,
The compressor 8 is driven to continuously or intermittently send compressed air to each section 3 to apply a constant pressure to each section, and the pressure detector 10 detects the pressure in each section 3, and the switching valve mechanism 7 The pressure in each section 3 is kept constant while controlling the driving of the control unit 11 by the control device 11.

By the way, when the tanker T gets ashore while sailing and the outer plate 1B is damaged, the pressure in the section 3 corresponding to the damaged portion is reduced. At this time, a pressure reduction signal is output from the pressure detector 10 to the control device 11, and the control device 11 outputs a blowing agent injection signal for opening the opening / closing section of the foaming agent stock solution tank 15 of the injection device 13. Then, the foaming agent 12 is injected into the decompressed section 3 and foams, and the foaming agent 12 fills the section 3.

This prevents seawater from entering into the gap 2 from the section 3 corresponding to the damaged portion of the outer panel 1B, and therefore does not make the draft deeper.
A can be prevented from being damaged, and oil can be prevented from leaking to the sea and polluting the environment.

The present invention is not limited to the above embodiment. In the above embodiment, a pair of left and right foaming agent stock solution tanks 1 are used.
5, the foaming agent 12 is injected into the section 3 corresponding to the outer panel 1B damaged by this. For example, the number of the foaming agent stock tanks 15 is equal to the number of the sections 3, and each section 3 is provided.
The foaming agent supply pipe 16 may be led out to deal with breakage of the outer plate 1B.

When the outer plate 1B is damaged, compressed air is supplied to the section 3 corresponding to the damaged portion of the outer plate 1B to detect the amount of the compressed air, and the amount of the compressed air is determined. For example, the degree of damage to the outer plate 1B can be determined by knowing whether the pressure in the section 3 can be kept constant.

[0016]

As is apparent from the above description, the present invention provides a method for detecting the pressure in each compartment by dividing the gap between the inner plate and the outer plate of the tanker hull into a plurality of compartments by partition walls. Since the pressure sensor is provided and the control device is configured to output a blowing agent injection signal to the blowing agent injection device by a pressure reduction signal from the pressure detector when the outer plate is broken, even if the outer plate is damaged, It is possible to prevent seawater from entering from the damaged portion to make the draft deeper, and thus to prevent the inner plate forming the oil hold from being secondarily damaged and prevent oil from flowing out to the sea.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a tanker showing an embodiment of the present invention.

FIG. 2 is a schematic diagram of the hull damage prevention device.

FIG. 3 is a cross-sectional view showing a conventional example in which an outer plate of a tanker is damaged.

FIG. 4 is a cross-sectional view showing a conventional example in which an inner plate of a tanker is damaged.

[Explanation of symbols]

 Reference Signs List 1 hull 1A inner plate 1B outer plate 3 section 5 pressure holding device 6 compressed air supply pipe 10 pressure detector 11 control device 13 injection device 15 foaming agent stock solution tank

Continuation of the front page (56) References JP-A-3-227795 (JP, A) JP-A-51-112091 (JP, A) JP-A-51-98896 (JP, A) JP-A-2-169385 (JP) , A) Japanese Utility Model Showa 62-90294 (JP, U) Japanese Utility Model Showa 55-91789 (JP, U) Japanese Utility Model Showa 63-98897 (JP, U) Japanese Utility Model Showa 59-143892 (JP, U) 4-4200 (JP, B2) (58) Field surveyed (Int. Cl. ⁶ , DB name) B63B 43/02-43/16 B63C 7/12 B63B 25/08

Claims (1)

(57) [Claims] 1. A hull is composed of an inner plate and an outer plate, a gap is formed between the inner plate and the outer plate, and the space is divided into a plurality of sections and the inner plate and the outer plate are connected to each other. Detector for detecting pressure in each section, an injection device for injecting a foaming agent into each section, and pressure detection due to breakage of the outer plate in a tanker provided with partition walls for And a control device having a function of outputting a blowing agent injection signal to the injection device in response to a pressure reduction signal from the vessel.