JP5703150B2 - Method and apparatus for separation of foreign matter contaminated soil in water - Google Patents

Description

  The present invention relates to an underwater separation method for foreign matter-containing soil and its apparatus in dredged sand in a sea area near a former storage area, dams, rivers, and seawater where there is a lot of illegal dumping.

  Conventionally, when dredging sand and bark with a lot of dirt and bark, foreign matter is mixed in the earth and sand, so the whole earth and sand becomes industrial waste. As a method of separating recyclable material such as sand from dredged earth and sand, for example, as described in Patent Document 1, a method of separating foreign matter and earth and sand using a swirl flow, It is known to have a filtration device that separates and filters impurities mixed in a liquid and removes earth and sand contained in the groundwater when pumping up the groundwater and the like with a pump. However, there is no method for separating foreign matter accumulated in the earth and sand, especially in the technical literature, and while putting the earth and sand into a hopper with a screen on a trolley or on land, There is a way to do the separation.

JP-A-11-137910

  However, a conventional foreign matter-contaminated earth and sand separation device can only separate a very small amount, and the size of the target separation is small and cannot be applied to dredged soil with foreign matter mixed therein. Moreover, when unloading earth and sand on land, a vast yard is required, and it is difficult to secure the yard because of the bad smell of earth and sand, and it is costly and time consuming because of land transportation. On the other hand, when dredged sand is separated on a trolley, large-scale outfitting is required and the work space is limited, so that it is not possible to separate large amounts of earth and sand.

  Furthermore, in order to treat a large amount of soil and sand dredged in a water area with a lot of garbage and bark, for example, an area for separation treatment is set up in the water area so that the pollution does not leak out, and the area for separation treatment is installed in the area. There is a method in which dredged soil is thrown in to separate foreign matter floating in the water and dredged sediment settled on the seabed. However, this method can only separate an object floating in water, and an object that sinks in water settles on the bottom of the water together with the earth and sand, and it is hardly possible to separate the earth and sand from the foreign matter only by adding the earth and sand.

  In addition, when soil that has settled on the bottom of the water is dredged, if it accumulates at the end of the processing area, dredging after the separation treatment becomes difficult. The underwater separation method and apparatus for foreign matter-containing earth and sand according to the present invention have been proposed to solve such problems.

  The gist of the present invention for solving the above-mentioned problems of the foreign matter-contaminated earth and sand separating apparatus according to the present invention is to introduce the foreign substance-contaminated earth and sand into a cylinder floating in water and swirl the foreign matter and earth and sand together. An underwater separation device for separation, wherein the screen is provided in the entire range or a partial range of the floor portion of the cylinder, and has a mesh that allows only the earth and sand to pass through without dropping the foreign matter to the bottom of the water; It consists of a net-like cylinder for separating foreign substances placed on the screen at the center, and a mixer device that is provided on the inner peripheral wall of the cylindrical body and generates a swirling flow to swirl foreign matter-containing earth and sand. is there.

  The mesh tube is formed to have a required diameter that prevents movement of foreign matter-containing earth and sand to the center of the cylinder, and the mesh size of the mesh tube is such that the foreign matter cannot enter the tube. Is a size that can be passed.

  The mesh tube is provided with an opening for collecting foreign matter in the peripheral wall surface, and an opening / closing mesh door movable along the peripheral wall surface is provided in the opening.

Moreover, the said mixer apparatus is provided with the foreign material penetration | invasion prevention wall which prevents the foreign material swirling with a swirl flow from colliding with the said mixer apparatus.
Furthermore, the screen includes being detachable from the cylindrical body, and the screen is provided with a mesh-like outer peripheral wall that is erected from the floor and is continuous in the circumferential direction.

  The gist for solving the above problems of the foreign matter-contaminated earth and sand separation method according to the present invention to achieve the object is to form the foreign matter-contaminated earth and sand underwater separation device, and Moved and transported to a position, driven by a mixer device to generate a swirling flow, drowned foreign matter-contaminated earth and sand is introduced into the underwater separation device, and the foreign matter-contaminated soil and sand is fed into the underwater separation device by the swirling flow. The foreign matter and the earth and sand are separated by converging and swirling in the mesh tube, and further, the foreign matter is deposited on the screen and the earth and sand is settled and deposited near the center of the bottom of the bottom of the mesh tube.

  Move the mesh door of the mesh tube to open the opening to store the separated foreign matter inside the mesh tube, cover the opening with the mesh door, remove the mesh tube and collect the foreign matter To include.

  According to the underwater separation method and apparatus for foreign matter-containing soil of the present invention, a large amount of foreign matter-containing soil can be charged and processed. The introduced foreign substance-containing earth and sand are collected at the center of the cylinder by the swirl flow, but the net-like cylinder prevents the foreign substance-containing earth and sand from moving to the center of the cylinder having a low flow velocity. As a result, the foreign-material-containing earth and sand turns around the peripheral wall surface of the mesh tube while maintaining a large flow velocity, and the separation of the foreign-material-containing earth and sand is promoted. Further, the peripheral wall surface of the mesh tube and the foreign substance-containing earth and sand are in sliding contact with each other, so that the earth and sand and the foreign substance are efficiently separated. In this way, the earth and sand and the foreign matter are separated by the large flow velocity of the swirling flow and the collision action between the peripheral wall of the mesh tube.

  In addition, by separating the separation cylinder installed in the center of the cylinder into a net, it passes only into the separated earth and sand, and the earth and sand collects at the center of the cylinder with a low flow velocity, so the earth and sand concentrate on the bottom of the water. After the foreign matter separation treatment, the sedimentation sediment is easily trapped. The separated foreign matter accumulates on the screen and is easy to collect.

  Since the screen is detachable from the cylinder, the foreign matter can be recovered by lifting the screen. Furthermore, foreign matters such as bark can be easily collected by providing the mesh tube with a foreign matter collecting function.

  When the screen is provided on the floor of the cylinder, a plate is disposed around the screen, so that the flow velocity of the swirling flow is not affected by the mesh screen, and the swirling flow is separated from above and below the plate. Cut off the influence of fluid below. In this way, the flow rate loss is large in the conventional floor full screen, but the flow rate loss is reduced by arranging the plate on a part of the floor. Therefore, a number of excellent effects of preventing a decrease in the flow velocity of the swirling flow and improving the demelting effect are achieved.

It is the perspective view seen from diagonally upward of the underwater separation apparatus 1 of the foreign material mixed earth and sand which concerns on this invention. It is a perspective view of the net-like cylinder 3 in the underwater separation apparatus 1 of the foreign material mixed earth and sand of the same invention. It is the perspective view (A) of the screen 2 in the underwater separation apparatus 1 of the foreign material mixed earth and sand of this invention, and the top view (B) of the state which provided the screen 2 in a part of floor part. It is the top view (A) of a use state of the underwater separation apparatus 1 of the same foreign material mixed earth and sand, a longitudinal cross-sectional view (B), and the side view (C) of the mixer apparatus 7. It is explanatory drawing (A), (B), (C) which verified the flow velocity of the swirl | vortex flow in the underwater separation apparatus 1 of the same foreign material mixed earth and sand.

  As shown in FIG. 1, a method for separating foreign matter-containing earth and sand according to the present invention and its separating apparatus 1 collects foreign substances that are solids other than earth and sand such as bark in a central portion of the apparatus 1 by a swirling flow, The foreign matter 4 is separated from the earth and sand 5 by the screen 2 and the net-like cylinder 3, and the foreign matter 4 such as bark is collected.

  As shown in FIG. 1, the foreign substance-contaminated earth and sand separating apparatus 1 according to the present invention throws foreign substance-contaminated earth and sand into a cylindrical body 1 a floated in water and separates the foreign substance 4 and the earth and sand 5 in a swirling flow. There is a screen 2 provided in the entire range or a partial range of the floor portion of the cylindrical body 1a and having a mesh that allows only the earth and sand 5 to pass through without dropping the foreign matter 4 to the bottom of the water.

  The cylindrical body 1a is a rigid cylindrical body, or a cylindrical body that can be levitated in which a ballast space is provided in a wall body and the vertical height can be arbitrarily adjusted. Therefore, it can be moved to a processing area such as dredging by a towed ship. As shown in FIG. 1, the cylindrical body 1a is a polygonal or round box, so that the swirl flow circulates efficiently.

  The mesh of the screen 2 has a mesh of a required size in the vertical direction of the cylindrical body 1a at a position between the central part and the lower end part to prevent passage of foreign matter 4 such as bark and allow passage of earth and sand 5. To do. Further, as shown in FIG. 3A, the screen 2 may be a box-like body that has a mesh-like outer peripheral wall standing from the floor and continuous in the circumferential direction and opened upward. This is to prevent the foreign matter 4 from falling from the side when the screen 2 is pulled up.

  Further, as shown in FIG. 3B, the screen 2 is not provided in the entire range of the floor portion of the round cylindrical body 1a, but the mesh portion is a part of the central portion, and the remaining periphery is provided. By disposing the floor plate 2a, the loss in the flow velocity of the swirling flow due to the screen of the mesh is reduced, and it becomes difficult to be affected by the water depth, and the separation flow becomes efficient by maintaining the swirling flow velocity large.

  In the case where the screen 2 is provided on the floor in a planar manner, the foreign matter 4 is collected by dividing the size of the screen 2 by changing the mesh size of the screen 2 at each level. Will be able to.

  As shown in FIGS. 1 and 2, there is a net-like cylinder 3 that is fixedly installed on the screen 2 at the center of the cylinder 1a or is detachably mounted. The mesh tube 3 prevents the foreign material 4 from moving to the center of the cylinder 1a having a small flow velocity, and the mesh tube 3 and foreign material-containing soil (4, 5) are in sliding contact with each other. The earth and sand 5 and the foreign material 4 are efficiently separated. The size of the mesh tube 3 is arbitrary, and as shown in FIGS. 4 (A) and 4 (B), the diameter is set so as to reach the upper end surface of the tube body 1a. The flow rate is determined appropriately in consideration of the flow rate and the desired amount of foreign matter recovery. It should be noted that the relationship between the size of the screen 2 and the mesh tube 3 when provided on a part of the floor may be either large or substantially the same.

  The mesh tube 3 may be provided with a function for collecting foreign matter 4. That is, as shown in FIG. 2, an opening 3a for collecting the foreign matter 4 therein is provided on the peripheral wall surface of the mesh tube 3, and the opening 3a is a mesh that can move up and down or left and right along the peripheral wall surface. A door 3b is provided. As an example, when the mesh door 3b is moved up and down, a rope or the like tied to the upper part of the door is lifted by a hand or a winch and lowered by its own weight. When the opening 3a is opened, the foreign matter 4 converged by the swirling flow 6 at the center of the cylindrical body 1a naturally enters the inside of the net-like cylinder 3. Since the mesh door 3b only needs to open the opening 3a, the mesh door 3b is not necessarily moved along the peripheral wall surface of the mesh tube 3. For example, the mesh door 3b is a rotary door that rotates about a rotation axis. If there is, there is a possibility that a foreign object or the like turning around the peripheral wall surface may collide with the rotating door. Therefore, it is preferable to move the mesh door 3b vertically and horizontally along the peripheral wall surface.

  As shown in FIG. 1 and FIGS. 4A and 4C, a mixer device 7 is provided on the inner peripheral wall of the cylindrical body 1a to generate and swirl the swirling flow 6. One or two or more mixer devices 7 are provided in the cylindrical body 1a, and the swirling flow is reversed in either one of the clockwise direction and the counterclockwise direction, or alternately in both directions.

  As shown in FIG. 1, the mixer device 7 is provided with a foreign matter intrusion prevention wall 8 that prevents the foreign matter 4 swirling with the swirling flow 6 from colliding with the mixer device 7. The foreign matter intrusion prevention wall 8 is made of a plate or net made of metal, synthetic resin, or the like, and is determined and installed as appropriate based on the properties of the foreign matter mixed earth and sand and the speed of the swirling flow.

  Between the lower end part of the said cylinder 1a and the water bottom, the sludge prevention film | membrane 11 which can be raised / lowered which divides the water of the circumference | surroundings of the cylinder 1a and the water under the cylinder 1a is suspended.

In the underwater separation apparatus 1 for foreign matter-containing earth and sand thus formed, as shown in FIGS. 5 (A) and 5 (B), with respect to the flow velocity of the swirl flow 6, the flow velocity (cm / s) at the distance from the center at the flow velocity measurement point. ) Is measured and verified. The measurement conditions are that the screen 2 is not provided, the position of the mixer device 7 is 30 cm from the water surface, and the output of the mixer device 7 is 2.8 to 4.0 (m ³ / min).

  Based on this result, the value of the flow velocity by the mixer device 7 is set to be large. For example, the radius of the mesh tube 3 is set to 40 cm to 45 cm or the like so as to avoid a distance of 30 cm or less from the center, which is much smaller than the flow velocity value of the peripheral wall, so that the flow velocity of the swirl flow is increased.

FIG. 5C is a comparison of the flow rates of the screen 2 with and without the floor plate 2a around it. In this condition, the measurement point is the black circle point in FIG. 5B, the screen 2 position is 70 cm from the water surface, the mixer device 7 position is 30 cm from the water surface, and the output of the mixer device 7 is 2.8 to 4.0. (M ³ / min). Thereby, the one where the floor board 2a exists around the screen 2 can maintain the flow velocity of a swirl flow large.

  An underwater separation method for foreign matter-containing soil and sand using the foreign matter-containing soil and sand separating device 1 according to the present invention will be described. The foreign matter-contaminated earth / sand separator 1 is moved and transported to a desired position in the separation area. In this case, the foreign substance-contaminated earth and sand submersible device 1 cylinder is boxed and adjusted by ballast to float and towed, or the foreign substance-contaminated earth and sand submersible apparatus 1 cylinder is floated and submerged. Towed and towed, transported with the foreign substance-contaminated sediment submersible separator 1 fixed on a trolley, or carried the assembly parts of the foreign substance-contaminated sediment submersible separator 1 on the trolley and assembled. Alternatively, the parts are assembled locally and installed at a desired position.

  Then, the mixer device 7 is driven to generate the swirling flow 6, and the trapped foreign matter mixed earth and sand (4, 5) is put into the underwater separation device 1. As a result, the foreign matter-containing soil (4, 5) is converged by the swirl flow 6 on the mesh tube 3 of the underwater separation device 1 and swirled while maintaining a large flow velocity, so that the foreign matter 4 and the sand 5 are separated. .

  Further, the foreign material-containing soil (4, 5) is brought into sliding contact with the mesh tube 3 to separate the foreign material 4 and the soil 5 by impact and friction. In this way, the foreign matter 4 is deposited on the screen 2 and the earth and sand 5 is settled and deposited near the center of the water bottom.

  Regarding the collection of the foreign matter 4, it is converged around the mesh tube 3 and deposited on the screen 2, and then the screen 2 is lifted by a crane or the like and collected from the cylinder 1 a. In this case, the mesh tube 3 and the screen 2 may be simultaneously lifted by a crane or the like, or the mesh tube 3 is first lifted by the crane, and then the screen 2 is lifted by the crane together with the foreign matter 4 and collected. Also good.

  When the net-like cylinder 3 is provided with a foreign matter collecting function, the net-like door 3b of the net-like cylinder 3 is lifted up via a rope or the like, and the separated foreign matter 4 is opened by opening the opening 3a. Store inside. Thereafter, after the opening 3a is covered with the mesh door 3b, the mesh tube 3 is removed with a wire of a crane and the foreign matter 4 is collected. In this way, a large amount of drowned foreign matter mixed earth and sand can be processed.

  The underwater separation apparatus for foreign matter-containing earth and sand and a separation method using the same according to the present invention can be applied to any foreign matter separation of dredged earth and sand, since it can also collect objects floating in water or sinking.

1 Underwater separation device for foreign matter mixed earth and sand, 1a cylinder,
2 screens, 2a floor boards,
3 mesh tube, 3a opening,
3b mesh door,
4 Foreign matter,
5 Earth and sand,
6 swirling flow,
7 mixer device, 7a foundation,
8 Foreign matter intrusion prevention wall,
11 Sludge prevention membrane.

Claims (8)

An underwater separation device that puts foreign material-containing soil into a cylinder suspended in water and separates the foreign material and the soil with a swirling flow.
A screen having a mesh that is provided in the entire range or a partial range of the floor in the cylindrical body and drops only by passing the earth and sand without dropping the foreign matter to the bottom of the water;
A net-like cylinder for separating foreign substances placed on the screen at the center of the cylinder;
A mixer device provided on the inner peripheral wall of the cylindrical body to generate a swirl flow and swirl foreign matter-containing soil;
An underwater separation device for contaminated soil. The mesh tube is formed to have a required diameter that prevents movement of foreign matter-containing earth and sand to the center of the cylinder, and the size of the mesh of the mesh tube is such that the foreign matter cannot enter the tube, Must be large enough to pass,
The underwater separation apparatus for foreign matter-containing earth and sand according to claim 1. The reticulated cylinder is provided with an opening for collecting foreign matter in the peripheral wall surface, and the opening is provided with a reticulated door for opening and closing movable along the peripheral wall surface;
The underwater separation apparatus for foreign matter-containing soil according to claim 1 or 2. The mixer device is provided with a foreign matter intrusion prevention wall that prevents foreign matter swirling with the swirling flow from colliding with the mixer device.
The underwater separation apparatus for foreign matter-containing earth and sand according to any one of claims 1 to 3. The screen is detachable from the cylinder,
The underwater separator for foreign matter-containing soil according to any one of claims 1 to 4. The screen is provided with a mesh-like outer peripheral wall standing from the floor and continuing in the circumferential direction.
The underwater separation apparatus for foreign matter-containing earth and sand according to any one of claims 1 to 5. The underwater separation device for foreign matter-containing earth and sand according to any one of claims 1 to 6 is formed, the underwater separation device for foreign matter-containing soil and sand is moved and transported to a desired position, and the mixer device is driven. A swirling flow is generated, the trapped foreign matter-containing soil is put into the underwater separation device, and the foreign matter-containing soil is converged on the mesh tube of the underwater separation device by the swirling flow and swirled to remove the foreign matter and the sand. Separating, and further depositing foreign matter on the screen and sedimenting sediment near the center of the bottom of the bottom of the mesh tube,
A method for separating underwater contaminated earth and sand, characterized by Move the mesh door of the mesh tube to open the opening, store the separated foreign matter inside the mesh tube, cover the opening with the mesh door, remove the mesh tube and collect the foreign matter about,
The method for separating foreign matter-containing earth and sand in water according to claim 7.

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