JPH0450233Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an earth and sand scattering ship for evenly spreading earth and sand on the seabed.

[Conventional technology]

Generally, when carrying out reclamation by transporting and dumping earth and sand on soft ground on the seabed, the quality of the seabed soil is first improved using the sand drain method during foundation work before reclamation.

That is, as shown in FIG. 4, in the soft ground 107 on the ocean floor, there is hard ground 1 located deeper than the soft ground 107 from the surface of the soft ground 107.
09, a large number of sand drain piles 1
08, sand is spread on the soft ground 107 to form sand mats 103 and 104.

After improving the quality of the seabed soil in this way, the sand 105 and 106 are spread onto the sand mat 104 using a sand scattering vessel such as an open-bottomed barge to perform reclamation. Once the land has been reclaimed to a certain depth, the earth and sand 102 is dumped from the land 110 until it is exposed above the sea surface 101, completing the reclaim.

By the way, conventionally, as an earth and sand scattering ship, one as shown in FIG. is provided with a plurality of earth and sand supply ports 113 each having an opening/closing door 113a.

Therefore, when dispersing the earth and sand 114 using such an earth and sand scattering ship, the earth and sand 114 is loaded in the earth and sand container 112, and the earth and sand 114 is transported to a predetermined sea area where the earth and sand 114 is to be spread by a barge or self-propelled. sail

Then, by opening the opening/closing door 113a, the earth and sand 114 is dropped from the earth and sand supply port 113 onto the seabed and is dispersed.

Furthermore, conventionally, a sand scattering ship as shown in Fig. 6 has been used, and in this sand spreading ship, the hull 01
is equipped with an earth and sand warehouse 03 and a crane 02 with a grab bucket.

When dispersing earth and sand using such an earth and sand scattering ship, the earth and sand 04 is loaded in the earth and sand storage vessel 03, and after the hull 01 is sailed to a predetermined sea area by the push boat 07, the crane 02 with a grab bucket is used. The earth and sand 04 in the earth and sand warehouse 03 are dumped from above the sea surface 06 and spread on the seabed.

In addition, the code 05 in Fig. 6 is a sand mat, 0
8 indicates a sand drain pile.

[Problem that the invention attempts to solve]

However, with the above-mentioned conventional earth and sand spreading vessel,
In either case, the sediment 114 or 04 is dumped directly onto the seabed from near the sea surface 101 or 06, so the sediment 114 or 04 will spread and pollute the seawater by the time it reaches the seabed. It is difficult to ensure the desired thickness, the area of earth and sand to be spread cannot be determined accurately, and it takes a long time to spread the earth and sand.

In addition, especially when spreading soil on the sand mat 104 or 04 on the seabed after soil improvement using the sand drain method, the soil is dumped from near the sea surface 101 or 06 as described above.
As the amount of dumped sediment increases, the impact that the seabed receives from the dumped sediment increases, causing sand mats 103,1
04 or 05 and the foundation soil may be destroyed.

Therefore, earth and sand scattering ships as shown in FIGS. 5b and 5c have been proposed.

In the earth and sand dispersion ship shown in FIG.
2, and at the bottom of this earth and sand storage 112, there is an earth and sand supply port 11 having an opening/closing door 113a.
There are multiple 3's available.

Then, when the earth and sand supply port 113 is opened, the earth and sand falling toward the seabed are surrounded by the bottom of the ship.
A pollution prevention plate 116 is attached to the lower surface of the hull 111, and inside this pollution prevention plate 116,
A plurality of buffer plates 115 are provided to reduce the falling speed of earth and sand by impact.

Note that the buffer plate 115 and the pollution prevention plate 116 are stored by winding the wire rope 117 with a winch 118 on the hull 111.

Therefore, when the opening/closing door 113a is opened and the earth and sand 114 is allowed to fall from the earth and sand supply port 113, the earth and sand 114 falls along the area surrounded by the pollution prevention plate 116, so that no pollution occurs in the seawater. can be prevented from occurring.

Further, since the falling speed of the earth and sand 114 is reduced by the buffer plate 115, the impact of the earth and sand on the seabed is considerably alleviated, making it possible to prevent destruction of sand mats and foundation soil.

On the other hand, in the earth and sand scattering ship shown in Figure 5c, the hull 1
An earth and sand container 119 is provided inside a well 120 formed in the wire rope 11 so as to be movable up and down.
It is suspended by a winch 118' via a winch 17' so that it can be lowered to below the bottom of the ship.

Further, a sand supply port 113' having an opening/closing door 113a' is formed at the bottom of the sand container 119. 11
When the door 3' is opened, the earth and sand 114 is scattered outward from the opening/closing door 113a'.

When dispersing soil using such a soil dispersion ship, first, the soil container 119 is accommodated in the well 120 and the soil supply port 11 is
3' is closed with the opening/closing door 113a', the earth and sand container 119 is loaded with earth and sand 114, and the vessel sails to a predetermined sea area.

Then, from the winch 118' to the wire rope 1
17' to lower the earth and sand container 119 to the vicinity of the seabed, and then open the opening/closing door 113a' to release the earth and sand 114 from the earth and sand supply port 113'.
is dropped onto the sea floor and dispersed.

In this way, the earth and sand scattering ship shown in Figure 5c,
Since the earth and sand 114 is transferred to the vicinity of the seabed by the earth and sand container 119, and then falls and is scattered near the seabed, it is possible to suppress the generation of pollution in the seawater, similar to the earth and sand dispersion ship shown in Fig. 5b. At the same time, the impact on the seabed is considerably alleviated, and damage to the sand pine and foundation soil can be prevented.

However, even with the earth and sand scattering ships shown in FIGS. 5b and 5c, there are still problems in that it is difficult to ensure a uniform predetermined thickness of the earth and sand to be spread, and the area of earth and sand that is to be spread cannot be accurately determined.

This invention aims to solve the above-mentioned problems, and makes it possible to spread soil evenly within a predetermined area on the seabed while reliably preventing seawater pollution and destruction of foundation soil. , whose purpose is to provide earth and sand spreading vessels.

[Means for solving problems]

For this reason, the earth and sand dispersion ship of the present invention has an earth and sand storage installed in the hull, and an earth and sand conveyor installed along the bottom of the ship to feed the earth and sand supplied from the earth and sand supply port at the lower end of the earth and sand storage. It is equipped with a feeding conveyor and a sand lifting conveyor that lifts the earth and sand sent from the earth and sand feeding conveyor to above the waterline of the ship's hull, and receives the earth and sand lifted by the earth and sand lifting conveyor and scatters it on the seabed. An earth and sand dispersing cylinder is arranged to protrude into the sea below the bottom of the ship along the hull outer plate and is movable up and down, and a mechanism for driving the cylinder up and down is provided at the lower end of the cylinder. It is characterized by an air supply system connected along the inside of the cylinder to raise air bubbles into the seawater.

[Effect]

In the above-mentioned earth and sand scattering ship of the present invention, when spreading earth and sand, the earth and sand in the earth and sand storage container is supplied from the earth and sand supply port onto the earth and sand feeding conveyor, and the earth and sand is transported by the earth and sand feeding conveyor to the earth and sand lifting conveyor. be done.

The earth and sand lifted above the waterline of the ship by the earth and sand lifting conveyor is delivered to the earth and sand dispersion cylinder, and is spread onto the seabed by the earth and sand distribution cylinder.

In addition, the air supplied from the air supply system rises as bubbles into the seawater along the inside of the sediment dispersion cylinder, and the outer periphery of the sediment flow falling inside the cylinder is covered with a layer of bubbles. The sediment flow descends along the cylinder without making direct contact with the seawater, that is, without turning into mud, and the sediment is dropped from the bottom of the cylinder close to the seabed, which reduces seawater pollution. Prevented.

Furthermore, since a bubble layer is interposed between the outer periphery of the debris flow inside the cylinder and the inner wall of the cylinder, the frictional resistance between the debris flow and the cylinder is reduced.

〔Example〕

Hereinafter, the earth and sand dispersing ship as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a schematic side view thereof, Fig. 2 is an enlarged sectional view taken along the - arrow in Fig. 1, and Fig. 3 is a cross-sectional view of the ship. FIG. 2 is a sectional view taken along the - arrow in FIG. 2;

As shown in FIG. 1, the hull 2 is provided with an earth and sand store 9, and this earth and sand store 9 has a number of earth and sand supply ports (not shown) formed at its lower end.

Further, a belt conveyor 10 as an earth and sand feeding conveyor is arranged below the earth and sand supply port of the earth and sand storage 9 in the bottom of the hull 2 along the earth and sand storage 9.
On this belt conveyor 10, the earth and sand 4 in the earth and sand warehouse 9 are
is supplied.

Furthermore, a belt conveyor 10a as an earth and sand lifting conveyor is provided inside the hull 2, and its lower end is located near the lower part of the feeding side end of the belt conveyor 10, while its upper end is
It is arranged above the waterline of the hull 2.

On the other hand, a belt conveyor 10 is installed at the end of the hull 2.
A cylinder 6 for dispersing earth and sand that receives the earth and sand lifted up by a is provided so as to be movable up and down so as to protrude below the bottom of the ship along the hull outer plate, and a lifting drive mechanism (not shown) is connected to this cylinder 6. ing.

As shown in FIGS. 2 and 3, an air pipe 7 as an air supply system is connected to the lower end of the cylinder 6, and compressed air is supplied from an air source (not shown) through the air pipe 7. , the bubbles rise along the inside of the cylindrical body 6.

This air pipe 7 is supported by bands 8 on all sides of the cylindrical body 6 .

The hull 2 is constructed with a displacement that provides sufficient buoyancy when loading earth and sand into the earth and sand hold 9, and is also navigated and moved by a pushboat 1, which is equipped with a propulsion device. It may be possible to make it self-propelled without using.

In addition, the reference numeral 3 in Fig. 1 indicates sand mats, and 5 indicates the foundation soil quality.

Since the earth and sand scattering ship as an embodiment of the present invention is constructed as described above, when spreading earth and sand, the ship body 2 is moved to a predetermined position by the push boat 1 with the earth and sand 4 loaded in the earth and sand storage 9. Let it sail to the sea area.

Then, in a predetermined sea area, the earth and sand dispersing cylinder 6 is lowered and placed as shown in FIG. 1 by a lift drive mechanism (not shown). At this time, the thickness of the scattered soil is determined by adjusting and fixing the height position of the cylinder 6 from the seabed surface.

Next, the belt conveyors 10, 10a are driven at a predetermined speed by a drive source (not shown), and
While navigating the hull 2 at a predetermined speed with the pushboat 1, the earth and sand supply port (not shown) is opened and closed to fill the earth and sand storage 9.
An appropriate amount of earth and sand 4 is supplied onto a belt conveyor 10 as an earth and sand feeding conveyor.

The earth and sand 4 supplied onto the belt conveyor 10 are
Belt conveyor 10a as a soil lifting conveyor
After being fed upward, it is lifted above the waterline of the hull 2 by the belt conveyor 10a, and then the earth and sand dispersing cylinder 6 is transported through the upper opening of the cylinder 6.
dropped inside.

The earth and sand 4 dropped into this cylindrical body 6 are
However, the air supplied from the air pipe 7 along the inside of the cylinder 6 rises in the form of bubbles against the seawater that enters from the opening at the bottom of the cylinder 6, and the bubble layer rises. Since the outer periphery of the sediment flow inside the cylinder body 6 is covered by the cylindrical body 6, the sediment flow is transferred to the vicinity of the seawater without directly contacting the seawater, and the sediment 4 is deposited on the same seabed (above the Dandomatsu 3 in FIG. 1).
will be distributed.

The scattered earth and sand 4 is leveled by the lower end of the cylinder 6, and a predetermined uniform thickness of the earth and sand is ensured.

In this way, the outer periphery of the sediment flow is covered with a bubble layer, and the sediment 4 inside the cylinder 6 is transported to the vicinity of the seabed without directly coming into contact with seawater (that is, without turning into mud). Since it is guided and then scattered on the seabed, it is possible to sufficiently prevent pollution from occurring in the seawater, and the impact on the seabed is considerably reduced, so that destruction of the sand mats 3 and the foundation soil 5 can be reliably prevented.

In addition, the earth and sand 4 are scattered only from the lower end of the cylinder 6, and the thickness of the applied earth and sand is determined by the position of the cylinder 6 and the navigation speed of the barge 1, and the earth is leveled by the lower end of the cylinder 6. 4
can be spread accurately and evenly within a predetermined area with a predetermined thickness of soil.

Furthermore, since the belt conveyors 10 and 10a enable continuous spreading of the earth and sand 4, the earth and sand spreading work can be carried out extremely efficiently.

In particular, when dispersing the earth and sand 4, compressed air is supplied to the seawater inside the cylinder 6 from the air pipe 7 as an air supply system, and air bubbles rise along the inside of the cylinder 3. As a result, a bubble layer is interposed between the outer periphery of the debris flow and the inner wall surface of the cylinder 6, which reduces the frictional resistance to the descent of the debris flow, and allows the debris 4 to be spread extremely smoothly. And it is done efficiently.

[Effect of idea]

As described in detail above, according to the earth and sand dispersion ship of the present invention, the earth and sand storage vessel provided in the hull and the earth and sand supplied from the earth and sand supply port at the lower end of the earth and sand storage area are fed along the inside of the ship. The vessel is equipped with an earth and sand transport conveyor and an earth and sand lifting conveyor that lifts the earth and sand sent from the earth and sand transport conveyor to above the waterline of the ship's hull, and receives the earth and sand lifted by the earth and sand lifting conveyor. An earth and sand dispersing cylinder is provided so as to be movable up and down, and is arranged so as to protrude into the sea below the bottom of the ship along the hull outer plate in order to spread the earth and sand to the seabed.
A simple configuration in which an air supply system for raising air bubbles into the seawater along the inside of the cylinder is connected to the lower end of the cylinder, reliably preventing seawater pollution and destruction of foundation soil, etc. At the same time, the earth and sand can be spread evenly within a predetermined area on the seabed.

Furthermore, it is possible to continuously spread the earth and sand using a conveyor, which has the advantage that the earth and sand spreading work can be carried out extremely efficiently.

Furthermore, the air bubbles rising along the inside of the cylinder reduce the frictional resistance between the earth and sand and the cylinder.
Spreading of earth and sand is carried out extremely smoothly and efficiently.

[Brief explanation of the drawing]

Figures 1 to 3 show an earth and sand dispersion ship as an embodiment of the present invention, in which Figure 1 is a schematic side view thereof, Figure 2 is an enlarged sectional view taken in the direction of the - arrow in Figure 1, and Figure 3 is a The figure is a sectional view taken along the - arrow in Fig. 2, Fig. 4 is a schematic seabed sectional view for explaining the sand drain method, and Figs. Figure 5a is a schematic cross-sectional view of the hull of a conventional open-bottom type earth and sand dispersion vessel, and Figure 5b is a conventional open-bottom type earth and sand distribution vessel for pollution prevention and fall speed buffering. Figure 5c is a schematic cross-sectional view of the hull of a ship equipped with a conventional earth and sand container, and Figure 6 is a cross-sectional view of a ship equipped with a conventional grab-bucket crane. FIG. 1... Push boat, 2... Hull, 3... Sand mat, 4... Earth and sand, 5... Foundation soil, 6... Earth and sand dispersion cylinder, 7... Air pipe as an air supply system, 8
...Band, 9...Earth storage, 10...Belt conveyor as an earth and sand feeding conveyor, 10a...Belt conveyor as an earth and sand lifting conveyor.

Claims (1)

[Scope of utility model registration request] An earth and sand storage container installed in the hull, an earth and sand conveyor installed along the bottom of the ship to transport earth and sand supplied from the earth and sand supply port at the lower end of the earth and sand storage chamber, and It is equipped with a sand lifting conveyor that lifts the supplied earth and sand above the waterline of the ship's hull, and protrudes into the sea below the bottom of the ship along the hull outer plate in order to receive the earth and sand lifted by the earth lifting conveyor and scatter it on the seabed. An earth and sand dispersing cylinder is arranged to be movable up and down, and a mechanism for driving the cylinder up and down is provided at the lower end of the cylinder to prevent air bubbles from forming in the seawater along the inside of the cylinder. An earth and sand spreading vessel, characterized in that it is connected to an air supply system for raising the soil.