JPS6340020A - Method and apparatus for covering bottom under water with sand - Google Patents

Abstract

PURPOSE:To ease impact to the bottom under water by spreading sand by a method in which sand carried from a barge to a sand-covering ship is uniformly spread over the bottom under water with uniform thickness from the tip of a chain conveyer having adjustable height while moving the sand-covering ship. CONSTITUTION:Sand S is carried through a loading conveyer 7 from a barge 3 to be moved by a pusher 2 to a sand-covering ship 1 by the wheel loader 6 of the ship 1 and then send to the direction of bow by a belt conveyer 8 set over the whole length of the ship. The sand S is then supplied in an uniform thickness layer through screw feeders 12 and 12' from a bow hopper 11 to chain conveyers 15 set in parallel in a chain conveyer ladder 10 whose chain conveyers 15 are hung down at adjustable tip heights by a winch 9. While regulating the moving speed of the ship 1 and also of the conveyers 15, the sand S is spread in uniform and desired thickness N on the sea bottom. The muddling of water can thus be lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method and apparatus for covering a water bottom with sand of a required thickness uniformly spreading on the water bottom.

[Prior art]

Traditionally, sand covering work involves covering soft ground such as sludge or water bottoms containing toxic substances with sand to prevent them from flowing out.
The most important thing is to spread the sand layer to the required thickness and uniformly, and when covering with sand, it is necessary to prevent the sand from sinking into the original ground and causing turbidity due to the dropping of sand. Therefore, it is desired to minimize the impact on the bottom surface of the water when sand is dropped.

[Purpose of the invention]

The present invention was made in response to the above-mentioned needs, and it is possible to spread sand uniformly to a required thickness when covering with sand.
Moreover, it is an object of the present invention to provide a method and apparatus for covering the water bottom with sand that reduces the impact on the bottom surface of the water caused by dropping sand, eliminates the sinking of sand into the original ground, and reduces the occurrence of turbidity in the water.

[Structure of the Invention] The water bottom sand covering method of the present invention which achieves the above-mentioned object uses a chain conveyor with an adjustable tip height installed on a sand covering ship to carry sand transported from an earth carrier to a sand covering machine. The method is characterized in that the sand is spread uniformly and to the required thickness from the tip of the sand capper to the water bottom while moving the sand capper, and in the above method, the speed of the sand capper and the speed of the chain conveyor A more preferable method is to scatter sand on the water bottom while adjusting the amount of sand, and the sand covering device to which this method is applied is a sand capping device that can transport sand from an earth carrier or the like onto a ship, with a In addition to installing a chain conveyor whose tip height is adjustable and which can spread the transported sand from the tip to the bottom of the water in the required width,
It is constructed by making it possible to adjust the moving speed of the sand capper and the speed of the chain conveyor.

〔Example〕

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a side view of a sand capping device according to an embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. FIG. 4 is an enlarged side sectional view, partially omitted, of the chain conveyor shown in the figure, and FIG. 4 is a side view of the soil transport ship.

First, in this embodiment, as shown in FIG. 1, a sand capping device 1 is shown, which is a sand covering device for covering the water bottom surface B with sand S.
As shown in FIG. 4, the sand S loaded on the earth transport barge 3 which is pushed by the barge 2 is attached to the lateral direction of the gate-shaped girder 5 which moves on the rail 4 provided in the sand capper 1. The sand S is transported onto the sand capper L via a loading conveyor 7 by a wheel loader 6, and the transported sand S is further transported toward the bow by a belt conveyor 8 provided in the direction of the ship's ship. .

Next, a chain conveyor ladder 10 is suspended from the bow side of the ship, the height of which can be adjusted freely by a winch 9, and has a plurality of chain conveyors 15 having a width W' arranged in parallel in FIG. The sand S transported by the belt conveyor 8 is transported from the hopper 11 installed at the bow to the width W/
2 to each of the chain conveyors 15 arranged in parallel via screw feeders 12 and 12' having a screw feeder 12 and 12' having a uniform thickness. As shown in FIG. 3, the sand is spread to a required thickness H. At this time, the sand capping device 1 is attached to an anchor made of a wire 13 whose end is secured with an anchor in the second time. Equipment and winch 1
4 to move to the stern side of the arrow R.

Therefore, in the present invention, by adjusting the moving speed of the sand capper 1 and the speed of the chain conveyor 15, the sand S to be spread is covered more uniformly and to an accurate required thickness H. There is.

Note that the required thickness H in this case is determined by a sand flat measuring device installed on the chain conveyor ladder 10.

The specified thickness H is constantly adjusted while mutually adjusting the speed of the chain conveyor 15 and the moving speed of the sand capper 1.
I try to keep it that way.

〔Effect of the invention〕

As explained above, by adopting the sand covering method and device of the present invention, it becomes possible to uniformly spread sand to the required thickness during sand covering, and moreover, the sand is spread near the water bottom. There is little impact on the water bottom surface due to sand scattering, and as a result, there is an effect that the sand sinks into the original ground and the occurrence of turbidity in the water is reduced.

In particular, since the present invention uses multiple chain conveyors in parallel, it has the advantage of having a large sand-covering capacity and making it possible to cover the sand with an even thickness in the width direction. are highly reliable because they have already been used in this type of sand-covering equipment (and the present invention can also be applied to sand-covering equipment such as existing sand-covering vessels).

[Brief explanation of drawings]

Fig. 1 is a side view of a sand capper in one embodiment of the present invention, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is an enlarged side sectional view of the chain conveyor shown in Fig. 1, with some parts omitted. , FIG. 4 is a side view of the earth carrier of FIG. 2. ■...Sand capper, 3...Earth carrier, 8...Heart conveyor, 10...Chain conveyor ratter, 15...
Chain conveyor, B...bottom surface, H...required thickness, S...sand, W...width.

Claims (1)

[Scope of Claims] 1. Sand transported from an earth-carrying vessel, etc. to a sand-covering vessel is transferred from the tip of a chain conveyor installed on the sand-covering vessel, whose tip height is adjustable, to the bottom surface of the water while moving the sand-covering vessel. A method of covering the water bottom with sand evenly and to the required thickness. 2. The method of sanding a water bottom according to claim 1, wherein sand is spread on the water bottom surface while adjusting the moving speed of a sand-covering boat and the speed of a chain conveyor. 3. A chain conveyor is installed on the bow side of a sand-covering vessel that can transport sand from an earth-carrying vessel, etc. onto the ship, and the height of the tip can be adjusted freely, and the conveyed sand can be spread from the tip to the water bottom in the required width. A sand-covering device on the bottom of the water that is provided with a sand-covering vessel and is capable of adjusting the moving speed of the sand-covering boat and the speed of the chain conveyor.