JP2000053079A - Full-opening type earth carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a full-opening type earth carrier safely operated without damaging a watertight sealing mechanism or flowing-out of sediment even in a sea area having a harsh hydrographic condition. SOLUTION: A pair of left and right ship bodies are connected rotatably around a deck hinge, both of the left and right ship bodies are opened/closed by the elongation/contraction of a hydraulic cylinder, and sediment stored in a hold 1b is discharged out of the ship. A ship body relative displacement suppressing mechanism 6 is provided to suppress relative displacements in upper and lower directions between the left and right ship bodies. The ship body relative displacement suppressing mechanism 6 is provided with a projecting member 6a projectingly provided in the lower portion of a rough center in the front and rear directions of the hold 1b of one of the opposing outer boards 1a and 1a of the ship body toward the other outer board 1a, and a recessed member 6b provided in the other outer board 1a corresponding to the projecting member 6a and fitted with the same while the left and right ship bodies are closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fully open earth transport ship used for transporting earth and sand and discharging it outboard for the purpose of constructing an artificial island, reclaiming a shore, revetment foundation work, and the like.

[0002]

2. Description of the Related Art A fully open type earth transport ship is used for transporting earth and sand and discharging it outboard for construction of artificial islands, reclamation of coasts, and construction of seawalls. hand,
For example, there is a center hinge system as shown in FIGS. That is, a pair of hulls 1 on the left and right
1 is rotatably connected about deck hinges 2 and 2, and the right and left hulls 1 and 1 are contracted by front and rear portions of the left and right hulls 1 and 1 and hydraulic cylinders 3 and 3 interposed therebetween. 1 is closed, and the earth and sand can be loaded in the hold 1b. Conversely, the left and right hulls 1 and 1 are fully opened by the extension of the hydraulic cylinders 3 and 3 to discharge the earth and sand in the hold 1b outside the ship. I have.

[0003] Further, in the above-mentioned conventional example, both left and right hulls 1, 1 are provided in order to prevent earth and sand and sludge in the hold 1b from flowing out of the ship.
A watertight seal mechanism is provided between them. The watertight sealing mechanism is, for example, as shown in FIG.
Of the outer plates 1a facing each other, a ridge 4a protruding toward the other, and a concave ridge 4b provided on the other outer plate corresponding to the ridge 4a. The convex ridges 4a and the concave ridges 4b are configured to fit together in a state where the hulls 1, 1 are closed. Each of the fitting portions is made of a rubber-like elastic body so as to be able to follow a slight deformation of the right and left hulls 1, 1.

When earth and sand are loaded in the hold 1b, the left and right hulls 1 and 1 are moved by the earth and sand load and the water pressure received from below.
Receives a force to open the deck hinges 2 and 2 in the left-right direction. For that force, hydraulic cylinders 3, 3
Has a function of applying a force in the opposite direction to both the left and right hulls 1, 1 to maintain a closed state between the left and right hulls 1, 1.

[0005]

However, the hold 1b, which is far from the hydraulic cylinders 3, 3 and has a weak binding force,
The center part of, the relative displacement between the left and right hulls 1, 1
There is a problem that the space between the two is opened, and the outflow of earth and sand or mud from the gap occurs. To describe a specific example, the left and right hulls of the center part of the hold 1b in the state where the earth and sand are loaded have a deformation amount of about 4 cm (for the left and right sides, respectively) in a 3,000 cubic meter class fully open type earth transport vessel. The relative displacement between the two hulls 1, 1 reaches about 8 cm).

[0006] In a large fully-open type earth transport ship having a large relative displacement in the left-right direction, the one shown in FIG. 5 is used in place of the above watertight seal mechanism. That is, both the left and right hulls 1,
The P-type packing 5a having a hollow top and a slidable top is overlapped on the outer plates 1a, 1a facing each other.
And a padding 5b are protrudingly provided, respectively.
b, the outer plates 1a, 1 of the left and right hulls 1, 1 facing each other.
Even if the distance between "a" and "a" slightly changes, the two are always in contact with each other, and the hold 1b is configured to be watertightly sealed.

However, the rolling motion (Roll) of the left and right hulls 1, 1 becomes large in a sea area where waves having a long wave period such as "undulations" invade, and as shown in FIG. Asymmetric vertical force F acts. For example, according to the swaying calculation for a 3,000 cubic meter, the shear force generated between the left and right hulls 1, 1 receiving the shear wave and the oblique wave is as shown in FIG. In addition,
Rolling of the right and left hulls 1, 1 with full soil (Roll)
Has a characteristic period of about 8 seconds.
It is understood that an extremely large asymmetric load (send force) acts in the vertical direction.

As described above, in a state where an extremely large asymmetric load in the vertical direction is applied between the left and right hulls 1 and 1, a relative displacement in the vertical direction exceeding an allowable value of the watertight seal mechanism occurs. Sediment may flow out.

[0009] Therefore, an object of the present invention is to solve the above-mentioned drawbacks of the conventional fully-opening earth-moving ship, and to solve the problem even in sea areas where sea conditions are severe.
It is an object of the present invention to provide a fully open earth transport vessel that can safely operate without damage to a watertight seal mechanism or runoff of earth and sand.

[0010]

In order to achieve the above object, a fully open type earth transport vessel according to the first aspect of the present invention comprises a pair of right and left hulls (1, 1) having deck hinges (2, 2). The lower parts of the left and right hulls (1, 1) are closed by the contraction of the hydraulic cylinders (3, 3) and are formed between the closed left and right hulls (1, 1). Ta hold (1b)
Can be loaded with earth and sand, and hydraulic cylinders (3,
The left and right hulls (1, 1) are fully opened by the extension of 3), and the earth and sand in the hold (1b) is discharged outboard. A hull relative displacement restraint mechanism (6) for restraining relative deformation in the directional direction, the hull relative displacement restraint mechanism (6) being provided with outer plates (1a, 1a) of the left and right hulls (1, 1) facing each other. ), A protruding member (6a) protruding toward the other outer plate (1a) at a lower part of the outer plate (1a) substantially at the center in the front-rear direction of the hold (1b), and Corresponding to the convex member (6a), when the left and right hulls (1, 1) provided on the other outer plate (1a) are closed, the convex member (6a) is closed.
A concave member (6b) that fits with a) and restrains vertical movement.
It is characterized by having.

[0011] Further, a fully-opened earth-moving ship according to the invention of claim 2 is:
A pair of hulls (1, 1) on the left and right sides are deck hinges (2, 2)
Is pivotally connected to the axis, and the hydraulic cylinder (3, 3)
The lower part of the left and right hulls (1, 1) is closed by the contraction of the hull, and the earth and sand can be loaded in the hold (1b) formed between the closed left and right hulls (1, 1). The left and right hulls (1, 1)
Is fully opened so that the earth and sand in the hold (1b) is discharged to the outside of the ship, and the outer plates (1a) of the left and right hulls (1,1) of the lower portion of the hold (1b) are opposed to each other. , 1
a) is provided with a watertight seal mechanism (5), and when the right and left hulls (1, 1) are closed, the outer plates (1a,
1a) to prevent the earth and sand from leaking out of the ship from the hold (1b) by sealing between the left and right hulls (1, 2).
1) A hull relative displacement restraining mechanism (6) for restraining vertical deformation between the hulls (1) is provided. Of the plates (1a, 1a), one of the outer plates (1a) is disposed substantially at the center of the hold (1b) in the front-rear direction and below the position of the watertight sealing mechanism (5), and the other outer plate (1a) is provided. ), And the convex member (6a) protruding toward
Corresponding to (a), the left and right hulls (1, 1) provided on the other outer plate (1a) are fitted with the convex members (6a) in a state in which both hulls (1, 1) are closed, and move in the vertical direction. It has a concave material (6b) for restraining.

[0012] Further, the fully open earth transport ship according to the third aspect of the present invention,
At least one or more deck hinges (2, 2) and hydraulic cylinders (3, 3) according to Claims 1 and 2 are provided before and after the hull (1, 1), respectively, and the hold (1b) is provided with the front and rear deck hinges (1). (2, 2), provided between the hydraulic cylinders (3, 3).

The symbols in the parentheses correspond to the symbols described in the drawings and the embodiments of the invention described later.

According to the present invention, of the outer plates of the left and right hulls facing each other, one of the outer plates protrudes toward a lower portion of a substantially center of the hold in the front-rear direction toward the other outer plate. Correspondingly, the left and right hulls are fitted with the concave material provided on the other outer plate in a closed state, so that a large roll occurs during navigation, and the left and right hulls The vertical displacement of the hold position is restricted even when a large asymmetric load (spring force) in the vertical direction acts on the cargo hold. In particular, when the hold position is set between the front and rear of the hull provided with the deck hinge and the hydraulic cylinder, the vertical displacement of the hold position where the relative displacement between the right and left hulls is the largest is restricted. .

Therefore, the relative displacement in the vertical direction between the right and left hulls can be suppressed to, for example, an allowable value or less of the watertight seal mechanism provided in the second aspect of the present invention, and the damage can be prevented. It is safe to operate in high seas, long periods, and severe sea conditions without any sediment runoff. If a slight gap is provided at the fitting portion between the convex member and the concave member of the hull relative displacement suppression mechanism, there is no problem in separation and separation, and therefore there is no problem in opening and closing the hold when discharging sediment. Absent.

[0016]

Embodiments of the present invention will be described with reference to the drawings. FIG. 8 is a side view of a fully-open type earth transport ship according to an embodiment of the present invention, FIG. 9 is a plan view thereof, and FIG.
0 is a sectional view taken along line XX of FIG. 9, and FIG. 11 is a sectional view taken along line YY of FIG. 9 mainly showing a hull relative displacement suppressing mechanism.

[0017] The fully open type earth transport ship of the present invention is configured as follows. That is, the pair of left and right hulls 1, 1 are rotatably connected at their bow (front side of the ship) and stern (rear side of the ship) around the deck hinges 2, 2. Also,
Hydraulic cylinders 3, 3 interposed between the left and right hulls 1, 1 are provided below the deck hinges 2, 2, respectively.

By the contraction of the hydraulic cylinders 3, 3, the lower portions of the left and right hulls 1, 1 are closed, and the earth and sand can be loaded in the hold 1b formed between the closed left and right hulls 1, 1. Conversely, the left and right hulls 1, 1 are fully opened by the extension of the hydraulic cylinders 3, 3, so that the earth and sand in the hold 1b is discharged outboard. Hold 1b
Is provided between the deck hinge 2 and the hydraulic cylinder 3 at the bow and the deck hinge 2 and the hydraulic cylinder 3 at the stern.

In addition, this earth-moving ship is based on a shear force between the right and left hulls 1, 1 which is caused by waves, for example.
2 for suppressing the vertical relative displacement between the left and right hulls 1 and 2
A plurality of hull relative displacement suppression mechanisms 6, 6 are provided. The number is not limited to two. In addition, the strength is such that a large roll occurs during navigation, and a large asymmetric load (send force) in the vertical direction acts between the left and right hulls 1, 1. It must be of such a degree that it will not be damaged even if it becomes restrained.

The details of each hull relative displacement suppressing mechanism 6 are as follows. That is, of the outer plates 1a, 1a of the left and right hulls 1, 1 facing each other, the hold 1
b, a convex member 6a protruding toward the other outer plate 1a and a concave member 6b provided on the other outer plate 1a corresponding to the convex member 6a. And The concave member 6b is configured to be fitted to the convex member 6a and to restrain the vertical movement in a state where both the left and right hulls 1, 1 are closed. Note that a slight gap is provided at the fitting portion between the convex member 6a and the concave member 6b of the hull relative displacement suppressing mechanism 6.

In order to prevent earth and sand or sludge in the hold 1b from flowing out of the ship when the right and left hulls 1, 1 are closed,
In the lower portion of the hold 1b, the outer plates 1a, 1a of the left and right hulls 1, 1 opposed to each other and above the position of the hull relative displacement suppressing mechanism 6 correspond to the length of the hold 1b. A continuous watertight sealing mechanism 5 shown in FIG. That is, a P-type packing 5a having a hollow tip and a pad 5b
Are protruded from the facing outer plates 1a, 1a, respectively, and even if the distance between the outer plates 1a, 1a of the left and right hulls 1, 1 slightly changes, they overlap with each other and always slide. It is configured to contact and hold the hold 1b in a watertight manner.

According to the fully-open type earth transport ship constructed as described above, the left and right hulls 1, 1 approach by the contraction of the hydraulic cylinders 3, 3, and the outer plates 1a, 1a of the left and right hulls 1, 1 are brought close.
Is closed, the watertight sealing mechanism 5 is constituted by P
The mold packing 5a and the abutment 5b overlap and abut each other to seal the hold 1b in a watertight manner, and furthermore, a concave member constituting each hull relative displacement suppressing mechanism 6 located at a lower portion of the watertight sealing mechanism 5. 6b and the convex member 6a fit each other.

When earth and sand are loaded in the hold 1b in the above state, the right and left hulls 1, 1 naturally open in the left and right directions about the deck hinges 2, 2 due to the earth and sand load and the water pressure received from below. And receive the power. On the other hand, the hydraulic cylinders 3, 3 try to maintain the closed state between the left and right hulls 1, 1 by applying forces in opposite directions to the left and right hulls 1, 1. Even so, there is considerable opening between the left and right hulls 1, 1 at the center of the hold 1b. However, the P-type packing 5a and the paddle 5b overlap each other and slide, so that they are always in contact with each other. Water tightness is maintained.

Further, of the outer plates 1a, 1a of the left and right hulls 1, 1 facing each other, a lower portion of one of the outer plates 1a substantially at the center in the front-rear direction of the hold 1b is attached to the other outer plate 1a. The corresponding protruding member 6a is fitted to the corresponding recessed member 6b provided on the other outer plate 1a in a state where both the left and right hulls 1, 1 are closed. Even if a large roll occurs and a large asymmetric load (send force) in the vertical direction acts between the left and right hulls 1, the relative displacement between the left and right hulls 1 is largest. Since the vertical relative displacement between the left and right hulls 1, 1 substantially at the center of the hold 1b is restricted, the overall vertical displacement between the left and right hulls 1, 1 is significantly reduced.

Therefore, the relative displacement in the vertical direction between the left and right hulls 1, 1 is suppressed to below the allowable value of the watertight seal mechanism 5 and its breakage is prevented. Even in severe sea areas, there is no outflow of sediment and safe operation is possible. Since a slight gap is provided at the fitting portion between the convex member 6a and the concave member 6b of the hull relative displacement suppressing mechanism 6, there is no problem in opening and closing the hold 1b when discharging the loaded earth and sand.

[0026]

As described above, according to the present invention, one of the outer plates of the left and right hulls facing each other is located at the lower part of the center of the hold in the front-rear direction and the other of the outer plates. The convex member protruding toward the correspondingly fits with the concave member provided on the other outer plate in a state where both the left and right hulls are closed, so that a large roll occurs during navigation, Even when a large vertical asymmetric load (sendar force) acts between the left and right hulls, the vertical relative displacement of the hold position is restricted. In particular, when the hold position is set between the front and rear of the hull provided with the deck hinge and the hydraulic cylinder, the vertical displacement of the hold position where the relative displacement between the right and left hulls is the largest is restricted. .

Therefore, the relative displacement in the vertical direction between the left and right hulls can be suppressed to, for example, an allowable value or less of the watertight seal mechanism provided as in claim 2 and breakage thereof can be prevented. It is safe to operate in high seas, long periods, and severe sea conditions without any sediment runoff. If a slight gap is provided at the fitting portion between the convex member and the concave member of the hull relative displacement suppression mechanism, there is no problem in separation and separation, and therefore there is no problem in opening and closing the hold when discharging sediment. Absent.

[Brief description of the drawings]

FIG. 1 is a side view showing a conventional fully-opening earth transport ship.

FIG. 2 is a plan view of FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a sectional view taken along the line YY of FIG. 2 showing an example of a watertight sealing mechanism.

FIG. 5 is a sectional view taken along the line YY of FIG. 2 showing another example of the watertight seal mechanism.

FIG. 6 is a cross-sectional view showing forces and deformations acting on the hull.

FIG. 7 is a graph showing the shear force generated between the left and right hulls 1 and 1 subjected to a shear wave and an oblique wave, obtained by a shaking calculation for a 3,000 cubic meter.

FIG. 8 is a side view showing a fully-open type earth transport vessel according to the embodiment of the present invention.

FIG. 9 is a plan view of FIG.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a sectional view taken along the line YY of FIG. 2, showing a main part of the fully-opening earth-moving ship according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 1a Outer board 1b Hold 2 Deck hinge 3 Hydraulic cylinder 4 Watertight seal mechanism 4a Convex ridge 4b Concave ridge 5 Watertight seal mechanism 5a P-type packing 5b Backing plate 6 Hull relative displacement restraining mechanism 6a Convex member 6b Concave member F T wave period

Claims (3)

[Claims] A pair of left and right hulls are rotatably connected about a deck hinge, and the lower portions of the right and left hulls are closed by contraction of a hydraulic cylinder, and are formed between the closed right and left hulls. And the left and right hulls are fully opened by the extension of the hydraulic cylinder, and the earth and sand in the hold is discharged outboard. A hull relative displacement restraint mechanism that restrains relative displacement in the vertical direction between the hulls is provided.
A convex member protruding toward the other outer plate at a lower portion of substantially the center in the front-rear direction of the hold of one outer plate, and provided on the other outer plate corresponding to the convex member. However,
A fully-open earth-moving ship comprising a concave member that fits with the convex member and restrains vertical movement in a state where both the left and right hulls are closed. 2. A pair of left and right hulls are rotatably connected about a deck hinge, and the lower portions of the left and right hulls are closed by contraction of a hydraulic cylinder, and are formed between the closed right and left hulls. The left and right hulls are fully opened by the extension of the hydraulic cylinder, and the sediment in the hold is discharged outboard. A watertight sealing mechanism is provided on the outer plates facing each other to seal between the opposing outer plates when the left and right hulls are closed to prevent earth and sand from leaking out of the hold from the ship. A ship, comprising a hull relative displacement inhibiting mechanism for inhibiting a vertical relative displacement between the left and right hulls, wherein the hull relative displacement inhibiting mechanism comprises a ,
One of the outer plates, substantially at the center in the front-rear direction of the hold and below the position of the watertight seal mechanism, the convex member protruding toward the other outer plate, and corresponding to the convex member, A fully-opening earth-moving ship comprising a concave member provided on the other outer plate, the concave member being fitted to the convex member and restraining vertical movement in a state where both right and left hulls are closed. 3. The deck hinge according to claim 1, wherein at least one of the deck hinges and the hydraulic cylinders are provided at the front and rear of the hull, and the hold is provided between the front and rear deck hinges and the hydraulic cylinders. Fully open earth transport ship.