JPH076201B2 - Equipment for spreading sand on the bottom of the water - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for spraying sand on a water bottom used in a sand-covering construction method in which sand is sprayed on the sludge on the bottom of the water and the sludge is contained in the bottom of the water. .

[Conventional technology]

Conventionally, it has been considered to cover the sludge on the bottom of the water by the sand-covering method to contain the sludge and prevent the harmful substances from flowing out from it, but conventionally, when sand is sprayed, turbidity in water occurs. Moreover, when the sand is sprayed on the sludge, there is a problem that the sludge is soared by the impact and the sand is caught in the sludge.

[Problems to be Solved by the Invention]

The present invention has been made to solve the above-mentioned conventional problems, and when spraying sand on the bottom of the water to cover the sludge on the bottom of the water, a spraying device with less impact and less turbidity. Is to solve the problem.

[Means for Solving the Problems]

As a means for solving the above problems, a device for spraying sand on a water bottom of the present invention is attached to the tip of a ladder of a work boat that can be turned around a spud, and the device is,
Toward the top of the collision hood, the bottom of which is recessed and the bottom of which is provided inside the cover in which the internal water level can be adjusted by means such as arrangement of air pressure feeding pipes and air vent pipes is open Along with piping a slurry pipe for sand slurry that mixes sand and water with its discharge port opened,
It is configured by providing an overhanging cover with an access hole around the cover.

In the spraying device configured as described above, the sand slurry discharged upward from the discharge port of the slurry pipe hits the collision hood, and the sand from which air bubbles are separated gently settles on the bottom of the water, but air with fine particles is generated. Is caught by the cover and the overhanging cover and is removed by the suction pipe or the like, so that the occurrence of dust in water is reduced.

〔Example〕

An embodiment of a sand spraying device on a water bottom according to the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view of a main part of the spraying device in one embodiment, and FIG. FIG. 3 is a side view, FIG. 3 is a front view of FIG. 2, FIG. 4 is a plan view of FIG. 2, and FIG. 5 is an overall side view showing how the apparatus of FIG. 1 is attached to a work boat.

First, as shown in FIG. 5, a work boat 1 for spraying sand on the water bottom of a pump boat or the like is made rotatable around a spud 2 in the direction of arrow F in FIG. 1, and is attached to the tip of a ladder 3 of the hull. , This spraying device is attached and used.

In the device of this embodiment, as shown in FIG. 2, the inside of the cover 5 of the device is divided into four chambers 4, sand slurry is supplied to each chamber 4, and sprayed on the water bottom B as shown in FIG. Then, the covering sand S is formed.

Next, the structure of the spraying device of this embodiment will be described with reference to FIG. 1 showing a cross section of one of the four chambers in the cover 5.

First, a slurry tube 6 for sand slurry in which sand and water are mixed
The collision hood 7 with the discharge port 6A facing upward, and the bottom opening with the shape of the rain gutter being turned over above the discharge port 6A.
Both ends of the collision hood 7 are extended to below the discharge port 6A, and a hole 7A is provided on the way.

Therefore, the discharge port 6A of the slurry pipe 6 is arranged upward toward the top of the collision hood 7.

Next, since the cover 5 has a concave shape that opens downwards like a bowl, the outside of the collision hood 7 is covered with this cover 5, and the lower end of the cover 5 is further covered. A skirt 8 is provided.

Further, an overhanging cover 12 as shown in FIGS. 2, 3, and 4 is provided around the cover 5.

On the other hand, an air pressure feeding pipe 9 and an air vent pipe 10 are arranged above the cover 5 so that the water level in the cover 5 can be adjusted, and an air vent pipe 11 is arranged above the overhanging cover 12.

Further, the operation of the spraying device thus configured will be described. First, compressed air is sent from the air pressure feeding pipe 9 into the cover 5, and the water level L in the cover 5 is lowered to the position of the hole 7A of the collision hood 7. However, at this time, the air vent pipe 10 is closed.

In this state, when the sand slurry is discharged upward from the discharge port 6A of the slurry pipe 6, the sand slurry hits the collision hood 7, air bubbles in the slurry are separated, and the momentum at the time of discharge is reduced. Therefore, it will fall gently in the sand collision hood 7.

The air A separated from the sand slurry moves above the cover 5 through the hole 7A of the collision hood 7, while the air A that has not separated when it hits the collision hood 7 falls during the falling of sand or when it reaches the surface. At the bottom, it separates from the sand and rises in the vicinity of the spraying position with the fine particles in the vicinity of the water bottom B.
Is caught by the overhanging cover 12 in which the suction pipe 11 is arranged, and is removed by the suction pipe 11.

In addition, since the air vent pipe 10 is arranged in the cover 5, when the air A in the sand slurry accumulates in the cover 5 and the water level in the cover 5 drops, the air vent pipe 10 is used to vent the air. , The water level L can be restored.

Further, since the hole 7A provided in the collision hood 7 is opened to some extent in the vertical direction, the water level L in the cover 5 is adjusted according to the type of sand to be sprayed, and the water level L in the cover 5 is adjusted. It can be set to the optimum position.

〔The invention's effect〕

(1). According to the present invention, a cover which is opened downward and whose water level is adjustable by taking in and out compressed air is attached, and a bottom of the cover is further opened, and a collision hood having a hole is provided around the cover. Since the slurry pipe for sand slurry with the discharge port opened toward the inner top of the collision hood is installed, the slurry collides toward the inner top of the collision hood in the air atmosphere to separate and diffuse sand from water. And by dropping in the air atmosphere, the momentum of the sand can be reduced and the sand can be sprayed evenly and evenly on the bottom of the water, and the water level can be adjusted to freely adjust the collision force of the slurry. It is possible to reduce the occurrence of turbidity in water by changing the degree of exposure of the holes formed around the collision hood to the air and changing the separation state of the air contained in the slurry. Wear.

From the water surface between the outside of the collision hood and the inside of the cover, the turbidity and bubbles in the water generated below the collision hood are released into the air atmosphere on the top surface of the cover, and by removing it from the cover, further cleaning is possible. It is possible to exert the chemical effect.

(2). In the present invention, since a cover with an exhaust pipe is provided around the cover, diffused turbidity can be collected in the cover and discharged to the outside by the exhaust pipe. It is possible to completely eliminate the occurrence of turbidity.

(3). As described above, the present invention has a compact structure in which the outside of the collision hood is covered with a cover, and another cover is provided around the cover to provide a variety of effects as described above at a time. Can play.

[Brief description of drawings]

1 is a front sectional view of a main part of a spraying device according to an embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1, FIG. 3 is a front view of FIG. 2, and FIG. 4 is FIG. FIG. 5 is a plan view and FIG. 5 is an overall side view showing how the device of FIG. 1 is attached to a work boat. 1 ... Work ship, 3 ... Ladder, 5 ... Cover, 6 ... Slurry pipe, 6A ... Discharge port, 7 ... Impact hood, 9 ... Air pressure feed pipe, 10 ... Air vent pipe, 11 ... … Skeleton tube,
12 …… Overhanging cover.

Claims (1)

[Claims] 1. A lower end of a ladder of a work boat is opened,
In addition, a cover whose inside water level can be adjusted by taking in and out compressed air is attached, and a collision hood with a bottom opening and a perforated hole is provided in the inside of the cover, and the collision hood is discharged toward the inside top of the collision hood. A device for sprinkling sand on the bottom of the water, which has an outlet and an overhanging cover with an exhaust pipe around the cover.