JPH0144595Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is a pollution prevention frame that prevents the pollution from spreading to the surrounding area by partitioning the area around the dredging area with a curtain and performing dredging work inside the curtain. It is related to.

(Prior Art) Conventionally, when dredging is carried out, a contamination prevention frame 1 as shown in FIG. 7 is installed at the location to limit the range of contamination of water 2 during dredging.

In this case, the pollution prevention frame 1 does not have a rectangular cylindrical shape, and includes a curtain 3, a float 4 attached to the upper edge of the curtain 3, and supporting the curtain 3 so that it does not sink.
It consists of a weight 5 attached to the lower part of the curtain 3.

Then, dredging work was carried out by lowering a grab bucket 6 into the interior partitioned by a curtain 3.

(Problem to be solved by the invention) However, the pollution prevention frame 1 with such a structure
In this case, when the grab bucket cart 6 descends, the curtain 3 expands as shown by the temporary line 3a, and when the grab bucket cart 6 rises, the curtain 3 repeatedly contracts as shown by the temporary line 3b, so the curtain 3 is easily damaged due to fatigue. There was a problem.

The present invention was developed in view of these problems, and its purpose is to provide a pollution prevention frame that can suppress the curtain from rapidly contracting from the expanded state and prevent damage to the curtain due to fatigue. It is.

(Means for Achieving the Object) The configuration of the present invention as a means for achieving the above object includes a cylindrical curtain, a float attached to the upper edge of the curtain, and a float attached to the curtain. In the pollution prevention frame that partitions the surrounding area of the dredging area with a sinker, a number of holes are distributed in the curtain. A check valve is provided to prevent water from flowing into the
The pollution prevention frame is comprised of a flexible tube whose base end is attached to the hole, and a weight is provided at the tip of the check valve.

(Function) According to the above configuration, when the grab bucket dredges the bottom of the water inside the curtain and rises, and the water level inside the curtain drops, each check valve opens fully and the outside water flows into the curtain. comes in.

Even if the water level inside the curtain rises due to the grab bucket being lowered into the curtain from above, each check valve remains closed at this time, preventing contaminated water from flowing out of the curtain. To prevent.

(Example) An example of the present invention will be described in detail below based on the drawings.

Figures 1 to 3 show pollution prevention frame 1 according to the present invention.
This figure shows a first embodiment of the invention.

The pollution prevention frame 1 of this embodiment has a cylindrical curtain 3 with a shape that widens at the end.

The curtain 3 is made of, for example, strong cloth, and a float 4 made of reinforced rubber or the like is attached to its upper edge so that the curtain 3 is suspended to prevent it from sinking.

The float is divided into multiple independent rooms by a bulkhead 4A to prevent it from sinking in the event of an accident.

Furthermore, annular intermediate floats 7 are provided intermittently in the longitudinal direction at a midway point around the outer circumference of the curtain 3, into which air can be moved in and out using a compressor or the like. This intermediate float 7 is also divided into a plurality of independent rooms.

Furthermore, a weight 5a consisting of a large number of chains is hung vertically on the outer circumferential surface of the curtain 3, and a weight 5a consisting of a large number of chains in the circumferential direction is hung at the bottom of the curtain 3.
b is suspended.

Further, the curtain 3 is provided with a number of holes 8 with a diameter of about 10 cm, for example, and each hole 8 allows water to flow into the curtain 3 but prevents water from flowing out of the curtain 3. A check valve 9 is installed in each case.

Each check valve 9 consists of a flexible tube 10 as a valve body, one end of which is attached to the hole 8 inside the curtain 3.

As the flexible tube 10, a durable cloth tube such as 800 # is used, and an example of its dimensions is that the diameter of the proximal end is approximately 10 cm, the diameter of the distal end is approximately 25 cm,
The length is approximately 40cm.

Next, the expansion and contraction actions of the pollution prevention frame 1 will be explained with reference to FIG. 1. First, the pollution prevention frame 1 is installed underwater in the state shown in FIG.

When a grab bucket is inserted into the curtain 3 of the pollution prevention frame 1 to dredge the bottom of the water, the volume inside the curtain 3 increases by the volume of the grab bucket and the pressure increases, so as shown in the right half of the figure. The check valve 9 closes to prevent polluted water from flowing out of the curtain 3, and the curtain 3 expands outward.

Next, when the grab bucket is pulled up from inside the curtain 3, the water 2, dirt, etc. inside the curtain 3 are removed together with the grab bucket, and the water level is lowered, creating negative pressure inside the curtain 3. As shown in the left half, the check valve 9 opens and the water 2 outside the curtain 3 flows into the curtain 3. The expanded curtain 3 gradually contracts as this water flows in, and the water 2 flows in until the inside and outside of the curtain are at the same pressure, that is, the pollution prevention frame 1 is initially installed underwater. continue.

In this way, the curtain 3 repeatedly expands and contracts as the grab bucket is moved in and out of the pollution prevention frame 1, but the check valve 9 prevents it from rapidly contracting from the inflated state. Ru.

Note that when the intermediate float 7 is used and the water depth in the dredging area is shallow, air is introduced into the intermediate float 7 according to the water depth to exert a float action, and the curtain portion above it is folded. The height of the pollution prevention frame 1 can be adjusted according to the water depth.

4 to 6 show a second embodiment of the present invention.

In this embodiment, the flexible tube 10 of the check valve 9 is
It is characterized in that a lightweight weight 12 made of a metal ring is attached to the tip.

If a lightweight weight 12 is attached to the tip of the flexible tube 10 in this way, the action of the weight 12 will cause the fifth
As shown in the figure, the flexible tube 10 can hang more effectively.

When the grab bucket is raised, this flexible tube 10 is lifted by the water pressure of the inflowing water, as shown in FIG. 6, because the weight 12 is lightweight.

(Effects of the invention) The present invention has the following effects by having the above configuration.

The curtain of the anti-fouling frame is provided with a number of dispersed holes, and each of these holes has a reverse tube consisting of a flexible tube that allows water to flow into the curtain but prevents water from flowing out of the curtain. Due to the provision of the stop valve, when the grab bucket is taken out of the pollution prevention frame, the water level inside the frame drops and becomes negative pressure, so the flexible tube opens perpendicularly to the curtain and the water outside the curtain is removed. Since water enters the curtain, it is possible to prevent the curtain from rapidly contracting from the expanded state, and damage due to fatigue can be prevented.

The check valve consists of a flexible tube, and a ring-shaped weight is provided at the tip of the check valve, so that when water flows in, the opening at the tip of the tube can be opened normally. , if a grab bucket is inserted into the pollution prevention frame,
Due to its weight, the flexible tube hangs downward, coming into contact with the periphery of the curtain and substantially closing the hole, making it possible to more effectively prevent the outflow of contaminated water.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an embodiment of the pollution prevention frame according to the present invention, Fig. 2 is a plan view of the same, and Fig. 3 is an exploded view.
FIG. 4 is a vertical cross-sectional view of one side of another embodiment of the present invention; FIG. 5 is an enlarged cross-sectional view of part A of the check valve in the closed state in FIG. 4; FIG. The figure is an enlarged sectional view of the open state, and FIG. 7 is an explanatory diagram of the conventional contamination prevention frame in use. In addition, in the figure, 1: pollution prevention frame, 2: water, 3: curtain, 4: float, 5: weight, 6: grab bucket, 7: intermediate float, 8: hole, 9: check valve, 1
0: flexible tube, 11: water bottom, 12: weight.

Claims (1)

[Claims for Utility Model Registration] (1) A pollution control device that partitions the surroundings of a dredging site by having a cylindrical curtain, a float attached to the upper edge of the curtain, and a weight attached to the curtain. In the prevention frame, a large number of holes are provided distributed in the curtain, and each of these holes is provided with a check valve that allows water to flow into the curtain but prevents water from flowing out of the curtain. . A pollution prevention frame, characterized in that the check valve comprises a flexible tube whose base end is attached to the hole, and a weight is provided at the tip of the check valve. (2) The contamination prevention frame according to claim 1, wherein annular intermediate floats are provided along the circumferential direction of the curtain at appropriate intervals in the vertical direction.