JPH11115879A - Combination bottom-hopper barge and box-shaped sediment carrying vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the submarine disposal of sediment and vessel-outside carrying with a crane, and to easily and safely perform the switching work of both the work by providing the structure of a bottom part of a hold into a combination bottom-hopper barge and sediment carrying vessel. SOLUTION: At the time of using a vessel as a bottom-hopper barge, a double-bottom door 5 is made to abut on each other so as to form a triangle cross section on the center beam 14. This structure is stabilized by constraining the movement of a lower end of the double-bottom door 5 in the right and left direction with a recessed and a projecting parts 10, 7. At the time of switching the vessel to a box-shaped sediment carrying vessel, a pair of hoisting devices are connected to the double-bottom door 5 for hoisting. At the time of lowering, a lower end of the double-bottom door 5 is pushed to an outer side so as to be moved right and left, and set in the horizontal direction. With this structure, vessel-outside carrying by crane is enabled, and switching work is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom-opening and box-type earth transport ship, and more particularly to a bottom-opening used for dumping earth and sand into the sea or lifting soil in the construction of artificial islands, reclamation of coasts, and revetment foundation works. It also relates to a box-shaped earth transport ship.

[0002]

2. Description of the Related Art In a conventional reclamation work, in an initial construction stage in which the water depth of a reclamation sea area is deeper than a draft of a land carrier, an open-bottom type land carrier as shown in a sectional view of FIG. Thus, the loaded landfill soil 4 is transported, the pair of bottom doors 1 is appropriately opened, and the soil 4 in the hold 2 is directly dumped into the sea, thereby shortening the construction period.

However, in the construction stage where the landfill work has gradually been promoted and the water depth has become shallow, the earth and sand 4 cannot be dumped into the sea. Therefore, the earth and sand is discharged out of the hold 2 using a lifting machine such as a grab or a backhoe. 4 needs to be unloaded.
However, in the bottom-opening type earth carrier shown in the cross-sectional view of FIG. 5, since the bottom of the hold is formed with an uneven portion by the bottom door 1 and the inclined plate 3, it is difficult to use the above-described earth-lifting machine. The bottom structure of the hold 2 such as the inclined plate 3 and the bottom door 1 may be mechanically damaged by the earthen machine. Accordingly, when using an earth-moving machine (not shown), a box-shaped earth carrier having a flat bottom portion of a hold as shown in a sectional view of FIG. 6 is generally used.

[0004]

The open-bottomed earth-moving ship shown in FIG. 5 is used when the water depth is deep and the sand 4 can be directly dumped on the seabed for the reasons described above. Other than this, a box-shaped earth transport ship shown in FIG. 6 is generally used in order to prevent a significant decrease in work efficiency and the like. As described above, there is a problem that the operating rate is reduced when only the bottom-opening type soil carrier is used.

[0005] An object of the present invention is to make the structure of the bottom of the hold of one earth carrier a dual-purpose type of an earth carrier with an open bottom and a box-type earth carrier. It is also possible to easily and safely carry out the switching operation.

FIGS. 7 and 8 are sectional views showing a shared state of a hold portion of a bottom-and-box dual-purpose earth-moving ship which is an object of the present invention. Among them, FIG. 7 shows each state when used as an open-bottom soil carrier, and FIG. 8 shows each state when used as a box-shaped earth carrier. When used as an open-bottom soil carrier,
The double bottom door 5 is pulled up to the upper part of the center girder 14 as shown in FIG.
When the earth and sand in the hold is dumped into the sea, the earth and sand are prevented from remaining on the center girder 14. When used as a box-type earth carrier, as shown in FIG. 8, the double bottom door 5 is divided into two parts, and the support structure 6 for the pair of double bottom doors 5 provided on the hold side wall and the center girder 14 is provided. To the double bottom door 5 and the center girder 4
The upper surface allows the hold bottom to have a substantially flat shape, thereby facilitating the use of the earthmoving machine (not shown).

A first technical problem with such a bottom-opening and box-type earth transport ship is that, as shown in FIG. 9, only the bottom door 1 on one side (port) is opened and the earth and sand 4 are dumped in the sea. In the case, the triangular structure formed by the double bottom door 5 has the structure shown in FIG.
As shown by the arrow in the left and right directions, the asymmetrical sediment-side pressure load R acts, so that a force F acts on the other port (starboard) door 5, and the triangular shape is easily broken, and a structure that is stable against this load R is required. Is particularly important.

A second technical problem is to move the double bottom door 5 safely and easily at the time of switching between a bottom-opening type soil carrier and a box-type soil carrier in a combined soil carrier.

[0009]

According to a first aspect of the present invention, there is provided a center girder extending completely along the center line of the bottom of the hold of the open-bottomed box-type earth transport ship in the longitudinal direction of the hold, When the bottom openings provided on both sides of the center girder are made openable and closable by the bottom doors, and a pair of left and right double bottom doors that are freely covered are placed above them, and when the double doors abut each other, On the center girder, while the double bottom doors are formed in a substantially triangular cross-section by the double bottom doors, when the double bottom doors are separated, each double bottom door is extended between the center girder and the side wall of the hold. It is provided with a support portion that can be separately laid so that the bottom of the double bottom door is flat, and when the double bottom door is formed in a substantially triangular shape on the center girder, both the positions where the left and right double bottom doors touch each other The double door web plate is provided with an uneven part and the center girder And the double bottom doors are provided with vertical uneven portions at positions where they contact each other.

[0010] In the second aspect of the present invention, in the first aspect of the present invention, the double door lifting device and the guide rail are provided near the front and rear end lateral bulkheads of the hold, and the lower end of the double bottom door is provided. A fluid cylinder capable of extending and contracting in the left-right direction for pushing the lower end portions of the left and right double bottom doors to the outboard side in a substantially triangular state is provided above the center girder.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to FIGS. First, referring to FIG. 1, in one embodiment of the present invention, when used as a bottom-opening type earth carrier, the double bottom door 5 is stably abutted on the center girder 14 in a triangular shape and used. . At this time, when the earth and sand are fully loaded in the ship, the symmetrical earth and sand pressure acts on the triangular structure as described above. The structure is stabilized by restricting the movement by the uneven portions 10 and 7. However, as shown in FIGS. 9 and 10, when an asymmetric load R is applied, a relative movement due to a vertical force F occurs at the top of the triangle, that is, at the point where the left and right double bottom doors 5 contact each other. In this case, there is a risk that the triangular structure may fall. In order to provide a structure that is stable against such an asymmetric load R, it is necessary to restrict the vertical movement of the left and right double bottom door 5 by the vertical force F at the triangular top. However, a remote-operated lock device for solving this problem requires high equipment costs, and a means for manually attaching the lock pin has a problem in safety such as forgetting to attach the lock pin.

An object of the present invention is to provide an inexpensive and safe structure that can stably maintain a triangular shape even under an asymmetric load.

FIG. 1 is a sectional view showing an embodiment of the present invention. In FIG. 1, uneven portions 10 and 7 are provided at locations where the center girder 14 and the lower end of the double bottom door 5 are in contact with each other, thereby restricting the lower end of the double bottom door 5 from moving in the left-right direction.
Also, the left and right double bottom doors 5 at the top of the triangle are provided with uneven portions 9 and 8, respectively. Here, the normal line QQ of the inclined surfaces of the concave and convex portions 9 and 8 is located on the center side of the fulcrum 10a, which is a support point in the vertical direction, on the center girder 14, so that the double bottom door 5 can be used. The formed triangular shape can maintain stability against an asymmetric load R.

That is, a center girder 14 is provided along the center line of the bottom of the hold, which is fully penetrated in the front-rear direction of the hold, and the bottom openings provided on both sides of the center girder 14 can be opened and closed by a bottom door. In addition, a pair of left and right double bottom doors 5 that can be covered freely are placed above the doors, and when the double doors 5 are abutted against each other, the sectional shape of the double bottom doors 5 on the center girder 14 is formed by the double bottom doors 5. Are formed in a substantially triangular shape, and when the double bottom doors 5 are separated, each double bottom door 5 can be separately laid across the center girder 14 and the side wall of the hold. Double bottom door 5
The left and right double bottom doors 5 are formed when the
Are provided on the web plate of the double bottom door 5 at positions where they contact each other, and at the position where the center girder 14 and each double bottom door 5 touch each other,
0 and 7 are provided.

Further, a suspension device 18 (a hydraulic cylinder, a wire, or the like) for the double bottom door 5 and a guide rail 17 are provided in the vicinity of a horizontal partition wall at the front and rear ends of the hold, and the double bottom door 5 has a triangular shape. In the formed state, a fluid cylinder 19 made of air or hydraulic pressure capable of expanding and contracting in the left-right direction for pushing both lower end portions of the left and right double bottom door 5 to the outboard side is provided on the upper part of the center girder 14.

FIG. 2 is a plan view showing the state of the hold when used as a box-shaped earth carrier. In FIG.
The hold side wall 12, double bottom door 13, center girder 14, and hold horizontal bulkhead 15 are shown, respectively. As a moving device of the double bottom door 13, a pair of rollers 16 is provided at the front and rear ends of the double bottom door 13, and guide rails 17 are respectively provided along the horizontal bulkheads 15 at the front and rear ends of the hold.

FIG. 3 shows a cross section in the vicinity of the bulkhead bulkhead 15. When switching from a box-type bulk carrier to a bottom-opening bulk carrier, a pair of suspension devices attached to the bulkhead bulkhead 15 are provided. 1
The double bottom door 8 is connected to the double bottom door 13, and the double bottom doors 5 are respectively pulled up along the guide rails 17 and set on the center girder 14 in a triangular shape.

FIG. 3 shows a state in which the double-bottom door 5 is set, and is set as an open-bottom soil carrier.

Next, referring to FIG. 4, when switching from a bottom-opening type soil carrier to a box-type soil carrier, a pair of lifting devices 18 are connected to the double bottom door 5, respectively, whereby the double bottom door 5 is connected. Pull up. Next, at the time of pulling down, the lower end of the double bottom door 5 is pushed outward by a fluid cylinder 19 provided in the center girder 14 in the left and right direction, and the roller 16 is placed on the guide rail 17, whereby the double bottom door is placed. The door 5 can be moved left and right and set horizontally.

In the above-described embodiment, the door 5
Although the convex portion 7 is formed at the lower end portion, the relationship of such unevenness may be reversed. The same applies to the top of the triangle.

[0021]

As described above, by adopting the double bottom door and the double bottom door moving measure according to the present invention, it is possible to switch between the bottom open type and the box type earth transport ship between the bottom open type and the box type. Remote operation makes it possible to perform the operation safely and easily in a short time.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a double door according to an embodiment of the present invention.

FIG. 2 is a plan view showing a double door moving device according to one embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a state in which the earth transport ship according to one embodiment of the present invention is used as a box type.

FIG. 4 is a cross-sectional view showing a case where the earth transport ship according to one embodiment of the present invention is used as an open bottom type.

FIG. 5 is a cross-sectional view showing a conventional bottom-opening-type dedicated earth carrier.

FIG. 6 is a cross-sectional view showing a conventional box-shaped earth carrier.

FIG. 7 is a cross-sectional view showing a state in which a conventional dual purpose ship is used as an open bottom type soil carrier.

FIG. 8 is a cross-sectional view showing a state in which a conventional dual purpose carrier is used as a box-type carrier.

FIG. 9 is a cross-sectional view showing a technical problem when a conventional dual purpose carrier is used as an open bottom type.

FIG. 10 is a cross-sectional view showing a stress relationship applied to the bottom opening door in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ship bottom door 2 hold 3 inclined plate 4 earth and sand 5 double bottom door 6 support structure 7 convex part 8 convex part 9 concave part 10 concave part 10 a Roller 17 Guide rail 18 Lifting device 19 Fluid cylinder

Claims (2)

[Claims] 1. A center girder extending in the front-rear direction of the hold along substantially the center line of the bottom of the hold is provided, and the bottom openings provided on both sides of the center girder can be opened and closed by a bottom door. A pair of left and right double bottom doors that can be covered are placed above the doors, and when the double bottom doors are abutted against each other, the double bottom doors have a substantially triangular cross section on the center girder. On the other hand, when the double bottom doors are separated, each double bottom door is provided with a support portion between the center girder and the side wall of the hold so that the bottom of the hold becomes a flat wall, When the door is formed in a substantially triangular shape on the center girder, the web plates of both double bottom doors at the position where the left and right double bottom doors are in contact with each other are provided with uneven portions respectively, and the center girder and each double bottom door are provided with Are provided with vertical uneven parts at the positions where A bottom-open and box-shaped earth transport ship. 2. A double bottom door lifting device and a guide rail are provided near the front and rear end horizontal bulkheads of the hold, and the lower ends of the left and right double bottom doors in a state where the double bottom door has a substantially triangular shape. 2. A bottom-opening and box-type transportation system according to claim 1, further comprising a moving device for a double-bottom door, wherein a fluid cylinder which can be extended and contracted in the left-right direction for pushing the portion to the outboard side is provided at an upper portion of the center girder. ship.