JP2003026075A - River-marine ship having variable draft structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sight-seeing ship, a ferry boat, or a leisure boat capable of sailing on a river and a waterway extremely shallow in the depth of water, and capable of safely sailing at a high speed even on the sea influenced by waves. SOLUTION: This ship connects two floats to a central hull having a flat bottom pat, controls the draft depth of the floats by using a cylinder or a screw by moving a connecting part, sails as an extremely shallow draft ship of a three-barrel structure composed of the floats and the central hull by pulling up the floats to the central hull side in a place extremely shallow in the depth of water, and sails as a catamaran ship of a catamaran structure by lifting the central hull on a water surface by pushing down the floats below the central hull in a place deep in the depth of water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sightseeing boat, a ferry boat, a leisure boat, etc. that can navigate rivers and waterways with extremely shallow water depths and can safely and rapidly navigate even in the sea affected by waves.

[0002]

2. Description of the Related Art In shallow water rivers and waterways, in order to avoid contact between the bottom of the river or waterway and the hull, a shallow draft tourist boat or ferry boat having a ship bottom close to a flat bottom is operated. Many of these ships have a flat hull cross-section to allow navigation even under a bridge with a small clearance from the water surface.

However, a ship with a shallow draft and a flat cross-section has a small distance from the water surface to the deck and is liable to lose its stability due to the influence of waves, which is a problem from the viewpoint of safety when sailing at sea. was there. In addition, the shallow draft flat bottom ship has a problem that it is difficult to navigate at high speed because of its large wave resistance.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a drainage type ship capable of navigating in a river or waterway where the water depth is extremely shallow and also navigating in the sea where waves are present, and varying the draft depth of the hull. The problem is to solve the problem by adding the means.

[0005]

[Means for Solving the Problems] The river / marine vessel having a variable draft structure according to the present invention for achieving the above object is constructed as follows. [1] In a ship in which two floats are connected to the left and right of a central hull having a flat bottom, the connecting part is made movable to control the draft depth of the float, and in a place where the water depth is extremely shallow, the float is the central hull. Of the float and the central hull to form an ultra-shallow draft ship with a three-body structure, and when the water depth is deep, the float is pushed below the central hull to bring the central hull above the water surface. It is characterized by being a catamaran with a lifting catamaran structure.

[2] The float is an elongated body having a small hydrodynamic resistance, and has a drainage volume and stability for hoisting the central hull above the water surface for navigation.

[3] The center hull and the float are connected by rotary joints, and the vertical position of the float is controlled by rotational angular displacement using a cylinder.

[4] The system for connecting the float and the central hull is a linear joint connection (slide connection), and the vertical position of the float is controlled by the linear joint displacement (slide displacement) using a cylinder or a screw. It is characterized by having done.

[5] By controlling the vertical position of the float, a part of the float is pressed against the riverbed or the seabed where the water depth is shallow, and the central hull is lifted, so that the ship can be moved in the shallow water without using mooring equipment. It is characterized by being fixed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a view showing a first embodiment of the present invention, and FIG. 1 (a) is a side view when an amphibious vessel with a variable draft structure sails in a place where the water depth is extremely shallow. Figure, Figure 1 (b)
Is a front view thereof.

In FIG. 1, the central hull (1) has a flat structure having a flat bottom portion, and the left and right floats (2A, 2)
B) is, for example, an elongated body having a circular cross section and low hydrodynamic resistance. The float and the central hull are connected by struts (3A, 3B). In a place where the water depth is extremely shallow, the float (2A, 2B) is pulled up to the side of the central hull (1), and the float (2A, 2B)
The float position is fixed at a height at which the bottom surface of the ship substantially matches the bottom surface of the central hull (1). As a result, it is possible to realize a ship with an extremely shallow draft structure that has great stability even in places where the water depth is extremely shallow.

FIG. 2 is a diagram when the above-mentioned river / vessel with a variable draft structure is navigating in a deep water.
2A is a side view thereof, and FIG. 2B is a front view thereof.
In deep water, the floats (2A, 2B) are pushed down by the control of cylinders (4A, 4B), and the float position is fixed below the central hull (1) to navigate in a catamaran form. Therefore, it is assumed that the two floats (2A, 2B) have a drainage volume sufficient to lift the central hull (1) above the water surface. In addition, the upper part of the float should be above the level of the still water to ensure stability. As a result, it is possible to realize a ship capable of safe high-speed navigation with little wave-making resistance even in the presence of waves.

FIG. 3 shows the float (2B) and the central hull (1)
It is a figure showing an example of a connecting method of. Struts (3A, 3B) are attached to the two floats (2A, 2B) at a plurality of positions, and the other ends of the struts are rotationally connected to the central hull (1). The cross-sectional shape of the struts (3A, 3B) is a wing shape or an elliptical shape with a small resistance. A cylinder (4A, 4B) is attached to each strut to control the float position. The portions of the cylinders (4A, 4B) that are immersed in water are also shaped to have low hydrodynamic resistance.
Struts (3A, 3B) are installed so that the bottom of the center hull does not have irregularities when the ship is in an extremely shallow draft structure. If a parallel crank mechanism is used for the rotary joint connection method, it is also possible to control the vertical position of the float without rotating the cross section of the float.

The struts of the above-mentioned river and marine vessel, when sailing in an extremely shallow draft structure, when sailing in a catamaran format,
And various loads act when the draft is changed. Especially when navigating in a catamaran format, dynamic loads such as a crotch opening force, a closing force or a twisting force of the two floats act on the strut, so the strut has sufficient strength to withstand those loads. Make it a prepared structure.

Next, a ship propulsion device will be described. When a propeller is used to propel a variable draft river and marine vessel, the propeller height is changed when sailing at an extremely shallow draft and when sailing in a catamaran format. For this purpose, for example, a vertical axis propulsion device using an electric motor is used so that the rotation axis of the propeller can be changed up and down according to the water depth.

FIG. 4 shows that by controlling the cylinders (4A, 4B) of an amphibious ship with a variable draft structure, a part of the floats (2A, 2B) is pressed against the riverbed or the seabed in a place where the water depth is shallow, and the center is controlled. It is the figure which lifted the hull (1) and stood the hull. By reinforcing the structure of the bottom of the float, it is possible to temporarily fix the ship in shallow water without using mooring equipment.

FIG. 5 is a view showing a second embodiment of the present invention, and FIG. 5 (a) is a side view when an amphibious ship with a variable draft structure sails in an extremely shallow water depth, FIG. (B) is the front view. FIG. 6A and FIG. 6B respectively show FIG.
FIG. 3 is a side view and a front view when the river / marine vessel with the variable draft structure shown in FIG.

The center cross section of the floats (12A, 12B) has a shape close to a rectangle, and in the state of the shallow draft structure, the floats (12A, 12B) are located on the side of the central hull (1) and the central hull ( The overall shape combined with 1) is a wide monohull shape. A cylinder (1) for vertically displacing the floats (12A, 12B) on both sides of the deck of the central hull (1)
4A, 14B) or a plurality of screw devices are attached, and the floats (12A, 12B) are vertically displaced by the cylinders (14A, 14B) or the screw devices in a deep water state. In addition, a slide device (15A, 1A) is provided between the float (12A, 12B) and the ship side of the central hull (1).
5B) is provided to support horizontal and vertical loads acting on the float, and when the draft is changed, the float can slide vertically on the side of the central hull (1). The left and right floats (12A, 12
The lower end of B) may be connected by a hydrofoil to make the draft of the float somewhat shallow by the lift of the vane.

[0019]

EFFECTS OF THE INVENTION By using the river / marine vessel of the present invention having a variable draft structure as a sightseeing boat, it becomes possible to carry out sightseeing in an upstream area of a river or sightseeing in a river by combining a river with an extremely shallow water depth and sightseeing from the sea. . In addition, by using a river / sea amphibious boat with a variable draft structure as a ferry boat, passengers from land near the neighboring islands or the sea can be transported to the city center even when the river water volume decreases, and urban traffic is reduced. It can be more convenient.

[Brief description of drawings]

FIG. 1 is a side view and a front view when an amphibious boat with a variable draft structure according to a first embodiment of the present invention navigates in an extremely shallow water depth.

2A and 2B are a side view and a front view when a river / sea amphibious boat having a variable draft structure according to a first embodiment of the present invention navigates in a deep water location.

FIG. 3 is a diagram showing an example of a method of connecting the float and the central hull.

FIG. 4 is a diagram in which a part of the float is set on the riverbed or the seabed, the central hull is lifted, and the hull is fixed.

5A and 5B are a side view and a front view, respectively, when a river / sea amphibious boat having a variable draft structure according to a second embodiment of the present invention navigates in an extremely shallow water depth.

[Fig. 6] Fig. 6 is a side view and a front view when an amphibious vessel with a variable draft structure according to a second embodiment of the present invention navigates in a deep water place.

[Explanation of symbols]

1 central hull 2A, 2B, 12A, 12B float 3A, 3B struts 4A, 4B, 14A, 4B cylinder 15A, 15B slide device

Claims (5)

[Claims] 1. In a ship in which two floats are connected to the left and right of a central hull having a flat bottom, the connection part is made movable to control the draft depth of the float, and the float is attached to the float at a very shallow water depth. The float and the center hull are pulled up to the side of the center hull to form an extremely shallow draft ship with a three-body structure, and when the water depth is deep, the float is pushed down below the center hull and A river / marine vessel with a variable draft structure characterized by being lifted up to form a catamaran structure. 2. The float is an elongated body having a small hydrodynamic resistance, and has a drainage volume and stability for lifting the central hull above the water surface for navigation.
An amphibious vessel with a variable draft structure as described. 3. The float and the central hull are connected by rotary joints, and the vertical position of the float is controlled by rotational angular displacement using a cylinder. A river / sea amphibious vessel with a variable draft structure. 4. The system for connecting the float and the central hull is a linear joint connection (slide connection), and the vertical position of the float is controlled by a linear joint displacement (slide displacement) using a cylinder or a screw. The river / marine vessel with a variable draft structure according to claim 1 or 2. 5. The boat is fixed to a shallow water without using mooring equipment by pushing a part of the float against a shallow riverbed or seabed to lift the central hull. An amphibious vessel with a variable draft structure according to any one of 1.