JPS598597B2 - Floating weight screen barge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a purge method for preventing contamination of water when dumping earth and sand into water, particularly when reclamation of a water body or the like.

Conventionally, the following measures have been taken to prevent water from being polluted in response to pollution prevention and other requirements when dumping earth and sand for seawalls, land reclamation, etc.

In other words, a seawall is first constructed in the reclaimed area, and the interior is reclaimed using the earth lifting method, and the excess water that seeps out from the reclaimed soil is treated with clear water and then released into the ocean.

Alternatively, fences can be erected over a vast area of the reclaimed area to prevent the spread of mudflow.

However, these conventional means have the following problems.

(1) Construction of seawalls or fences itself pollutes the sea area.

(2) Treatment of surplus water requires multiple equipment and costs.

(3) Fixed equipment such as fences is only useful for that location and cannot be used elsewhere.

(4) Their construction and removal requires many days and labor.

(5) Easily damaged during severe weather such as typhoons.

(6) It takes a long time to directly pour purge into and out of enclosures such as fences, and the time required to prevent leakage of turbid water is added.
Planned execution of work is impaired.

In order to eliminate such problems, the present inventors previously proposed a "pollution prevention screen barge", and the present invention further improves it.

That is, the previously proposed devices generally had structures as shown in FIGS. 1 to 3.

That is, the purge main body 1', which has a U-shaped plane and floats on the water surface, has a beam 3' connecting the open ends of the U-shaped purge body 1', which has a height so as to allow the direct throw barge 9' to enter below it. Straddling.

Below the purge main body 1', a screen 4' is vertically installed by a winder 5' and can be freely unrolled and rolled up, and a peg 6' is attached below the screen 4'.

An appropriate number of fenders 7' are attached to the inner water surface 2' side of the purge body 1' to alleviate collisions with the direct throw barge 9' when it enters.

A gap 8' is provided above the screen 4' and between it and the bottom surface of the purge body 1', and is configured to allow water to enter from outside the screen 4'.

Next, to explain the use of the pollution prevention screen barge constructed in this way, as shown in Fig. 3, the soil 11
When the direct throw barge 9' loaded with barge 9' enters the inland water surface 2', the screen 4' is unwound and the bottom door 10' of the direct throw barge 9' is opened when the screen 4' reaches the bottom of the water. Sediment 1
1' falls through the water to the bottom as shown in the figure, and becomes a sediment flow 1.
3' and spreads out in all directions.

As will be described in detail in the embodiments of the present invention, the screen 4' is used to isolate the turbidity 12' from the outside so that the turbidity 12' generated at that time does not diffuse outward.

Note that a circulating flow 14' caused by the falling flow of earth and sand 11' is formed inside the screen 4', but the screen 4' prevents water from entering the circulating flow 14' from the outside and prevents water from entering the circulating flow 14'.
This has the effect of preventing the diffusion of energy and efficiently retaining the turbidity 12' within the screen 4'.

The pollution prevention screen barge described above has achieved excellent results, but as a result of various experiments, it has been found that the debris flow 13' lifts the plow 6' with strong force, so if it lacks sufficient weight, it will not be able to lift the barge. The dirt 12' along with the debris flow 13' does not fall easily due to being pushed by the jet flow generated by the debris flow 13'.
It is easy to cause this to occur, allowing it to erupt outward.

Therefore, a sufficiently heavy plow C is required, which makes handling difficult, limits the lifespan of the screen 4', and may lead to premature breakage due to bending of the joint between the plow 6' and the screen 4'. I started to expect things to be sexual.

In view of these circumstances, the present invention attempts to propose a purge having a screen that eliminates all of the above concerns with an extremely light weight. The purge main body floats in the air, and both ends of the purge main body are connected to two rows of winding machines across the U-shaped area below the purge main body, and a plow is placed in the middle in an unrestrained manner, and the purge body is unwinded and rolled up. A floating weight screen barge comprising a screen that can be installed vertically, and a gap between the upper end of the screen and the bottom of the purge body, the present invention With the structure described above, the unrestrained pegs, which are located in the center of the screens that hang down from the two rows of winders in a bridge-like manner, can freely roll and change their position according to the horizontal movement of the screens. It can be moved, and even if the mudflow hits the screen, there is nothing to restrict the movement of the plow at that moment.
The plow does not spring upwards, but freely rolls or slides outward on the screen, keeping the screen always pressed against the top of the mudflow, achieving the purpose of blocking the jet of turbid water with an extremely light plow. It is something that can be done.

The original purpose of the barge, similar to the previously proposed pollution prevention screen barge, is to eliminate the above-mentioned problems (1)-{6), and a purge system that dumps earth and sand into the U-shaped part is introduced. , the screen is rolled down so that its lower end reaches the bottom of the water and surrounds it, and then the soil is dumped, and then the screen is raised slightly to create a gap between the bottom of the water and the screen, and the upper end that has been set in advance is Clear water can flow into the screen from the gaps, and turbid water with a large apparent specific gravity can flow out from the gaps below in a thin plate-like layer while crawling along the bottom of the water, allowing it to diffuse and settle. This makes it possible to dump earth and sand without polluting the water.

Next, one embodiment of the present invention will be described with reference to FIGS. 4 to 9.

The purge body 1 is similar to the conventional example and has a U-shape in plan, and a direct throw barge 9 as shown in Fig. 4 is inserted in order to dump the reclaimed earth and sand into the inland water surface 2 surrounded by the ship's hull. be able to.

The long parallel parts of the purge body 1 are connected at one or several locations by beams 3.

This beam 3 is required for strong reinforcement, but in order to insert the direct throw barge 9 into the internal water tank 2, it is installed at a position considerably higher than the purge body 1, as shown in FIG.

At the bottom of the purge main body 1, a screen 4 made of highly rigid rubber or cloth is installed with both ends connected to two rows of winders 5, which will be described later.
is unwound or wound up freely or intentionally by a winding machine 5 driven by a drive source such as an electric motor (not shown), for example, via a freely controllable clutch.

A plurality of roller-shaped plows 6 are placed on the upper center surface of the screen 4 in an unrestricted manner.

A gap 8 is provided between the winder 5 and the bottom of the purge body 1 so that a water flow can pass therethrough for reasons described later.

In addition, since the screen 4 has a finite width, it is necessary to divide it into several sets of screens in order to cover the entire space below the purge body 1, but it is necessary to prevent adjacent gaps between the screen 4 and the screen 40. Therefore, the end of the screen 4 is installed so as to overlap with the adjacent end.

Further, a large number of fenders 7 are attached to the inner water surface 2 side of the purge body 1 in order to soften the impact pressure caused by contact when the direct throw barge 9 is drawn into the inner water surface 2.

Further, although not shown, the purge main body 1 is equipped with a device for measuring the position of the ship and the depth of the water, and also has a movable anchor and an anchor winch.

-Next, the effects of the above embodiment will be explained.

After positioning the purge of the above embodiment at the buried soil dumping point, when the direct throw barge 9 enters the inland water surface 2, the direct throw barge 9 is pushed by the pusher 01 as shown in FIG. comes in.

At this stage, as shown in FIG. 7, the connecting rope 21 between the direct throw barge 9 and the pusher 01 is loosened to make the direct throw barge 9 free.

The screen 4 is lowered to the bottom of the water, as shown in FIG. 4, before or after the direct throw barge 9 enters.

Next, when the bottom doors 10 of the direct throw barge 9 are opened all at once,
As shown in Figure 4, earth and sand 11 loaded on the direct dumping barge 9
begins to fall.

At this time, the falling speed of the earth and sand 11 gradually increases due to gravity, and the porosity in the water increases, so that the surrounding water is strongly absorbed.

For this reason, a strong circulating flow 14 is generated in the water below the inner water body 2 surrounded by the suspended screen 4, and eventually the screen 4 itself is attracted to the water flow, resulting in the state shown in the figure.

On the other hand, after the falling earth and sand 11 collides with the water bottom, it separates into left and right sides and moves on the water bottom at a high speed, as shown in FIG.

This earth and sand 11 collides with the screen 4 and flows out of the screen 4 in a manner that pushes it up.

Turbidity caused by the sediment 11 can be created by water being sucked into a falling sediment flow and mixing violently with the sediment 11, or created by part of the sediment 11 colliding with the bottom surface of the water being thrown up into the water. In both cases, the porosity of the sediment 11 decreases due to the sedimentation effect of the sediment 11 during the horizontal flow stage after the sediment 11 collides with the water bottom, and the porosity of the sediment 11 decreases, consolidating in the released turbid water. It is not possible to distinguish between the two.

The turbid water generated in this way moves along with the circulating flow 14 inside the screen 4 mentioned above, and is sucked into the falling debris flow again, so that eventually the turbid water 12 is created within the partition of the screen 4.
will be accumulated in concentrated form.

In addition, the mud flow 13 exiting outside the partition of the screen 4
As a result, the turbidity 12 is brought out to some extent, but this degree is unavoidable for practical purposes.

When all of the earth and sand 11 from the direct casting barge 9 has been dumped, first the flow of the earth and sand flow 13 on the bottom surface of the water stops, and then the circulating flow 14 in the cutout of the screen 4 stops.

At this stage, the lower part of the screen 4 is on the sediment that has accumulated on the bottom surface of the water, the inside of the screen 4 is turbid water, and the screen 4 is
The water outside is clear.

In this state, operate the winder 5 to wind up the screen 4,
When a gap 15 is created between the lower part of the screen 4 and the bottom surface of the water as shown in FIG. Clear water flows in, and turbidity 12 is gradually pushed out along the seabed through the gap 15 at the bottom of the screen 4.

At this time, an interface 16 is formed between the turbidity 12 and the non-turbid water that has flowed in, and this is slowly decreasing.

In this way, the turbidity 12 spreads in a thin layer on the bottom surface of the water, which is not affected by waves created by ships, purges, etc., and then settles and disappears.

On the other hand, even if the direct throw barge 9 that has dumped the earth and sand comes out of the purge body 1 relatively quickly and moves on to the next step, the boundary surface 16 has already left the bottom of the direct throw barge 9 and descended downward as described above. Therefore, there is no possibility of bringing turbid water out of the screen 4.

Next, regarding the relationship between the screen 4 and the plow 6 during the above-mentioned operation, in the conventional case, as shown in FIG. When an external force (dynamic pressure) of F is applied to the jet stream, the winder 5' and the screen 4' have inertia, so they cannot immediately move outward, that is, to the right, and the plow 6' is pushed against the screen 4'. As a result, a tension T is generated on the screen 4', and the tension T
A resultant force 2 of and external force F is generated upward, and the force 6 is
′ will be reduced.

In other words, the peg C requires a weight equal to the statically required weight plus approximately the resultant force 2.

On the other hand, in the case of this embodiment, as shown in FIG.
For convenience, the two winding machines are shown separately as 5a and 5b. When external force F is applied to the screen 4, the peg 6, which was approximately in the middle of the screen 4, is pushed by the left side of the screen 4 so as to turn it over to the right. However, since the peg 6 is not restrained, it freely rolls to the right and is displaced, for example, to the position shown by the chain line.

At that time, the left side of the screen 4 has apparently increased in length by a, but the right side has conversely shrunk by b, and as a result, the screen 4 hardly needs to be stretched. Therefore, it is not necessary to rotate the winder 50 times, and therefore the winder 5
And regardless of the inertia of screen 4, screen 4 is
to maintain contact with the upper surface of the mudflow, and
Since the screen 4 receives almost no upward force, its weight maintains the downward restraining force of the screen 4.

Incidentally, in FIG. 8, if the plow 6 were to be connected to the screen 4 as in the past, when it moves to the position indicated by the chain line, the screen 4 would have to extend by the dimension a, but as mentioned above, the winder 5 Since both the screen 4 and the screen 4 have inertia and cannot follow it instantaneously, the weight of the plow is reduced as explained in connection with FIG. 9.

As explained above, in this embodiment, the weight of the plow 6 is not reduced, so the plow 6 can be made smaller than in the conventional case, and there is no need to stretch the Shitemo screen 4 against the strong jet flow. Therefore, the screen 4 always reliably contacts the sediment flow and blocks turbid water from flowing outward.

In the above embodiment, the pegs 6 are connected to each other in the form of a roller, but they may be connected in a spherical or other shape that easily rolls, or in the longitudinal direction (the direction toward the back of FIG. 4 or FIG. 5).
You just have to hold it so that it does not move freely.

Note that even if the shape is not necessarily transferable, as long as it is slippery, the purpose will still be achieved.

Note that the above-mentioned effects were confirmed through experiments, and a remarkable positive effect was achieved.

As specifically explained in the embodiment above, the present invention surrounds the turbid water generated at the earth and sand dumping site with a screen, and then uses the density difference between turbid water and non-turbid water to rationally allow only the turbid water to crawl to the bottom of the water. Since it can be made to work, the following effects can be achieved.

(b) Landfill can be done without polluting the sea area.

(Ol does not require any water treatment equipment.

(・} Since it is not a fixed facility, it can be towed to any location and used, making it extremely versatile.

(d) There is no need for the construction and removal time and effort required for fixed equipment.

((1) During stormy weather such as a typhoon, it can be evacuated to the harbor, so there is no problem of damage caused by wind and waves unlike fixed equipment.

(c) Since the turbid water is rationally moved downward from the bottom of the direct throw barge, the direct throw barge can quickly leave the reclaimed water area, and the reclamation work can be carried out systematically and efficiently without interfering with the work schedule.

(g) As a device, the screen has a high ability to block turbid water.

(5') The screen peg can be made lighter and easier to handle.

(ri) Since the screen and the peg are not connected, the life of the screen is dramatically extended.

[Brief explanation of drawings]

Fig. 1 is a plan view of the conventional example, Fig. 2 is a front view of the conventional example seen along the ■-n arrow line, Fig. 3 is a front view showing the conventional example in use, and Fig. 4 is the invention of the present invention. FIG. 5 is a front view showing the usage state of one embodiment in correspondence with FIG. 3, FIG. 5 is a front view showing the final stage of the usage state of the above embodiment, and FIG.
Fig. γ shows a state in which the relationship between the direct throw barge 9 and the pusher 01 is free, and Fig. 8 shows the screen 4 and the weight of an embodiment of the present invention. FIG. 9 is a diagram illustrating the function of the screen 4' and the peg 6' in the conventional example.

Claims (1)

[Claims] 1. A purge body with 1,000 sides forming a U-shape and floating on the water surface, and below the purge body, both ends of the purge body are connected to two rows of winders over the entire area of the U-shape, and a plow is placed in the middle. A floating purge comprising: a vertically installed screen on which the purge body is placed in an unrestricted manner so as to be able to be unrolled and reeled in; and a gap provided between the upper end of the screen and the bottom of the purge main body. A cylindrical screen barge.