JP4637025B2 - Pollution control device and mooring method of pollution control device - Google Patents

Description

  The present invention relates to a pollution prevention device that is stretched over a lake or the like to prevent inflow or outflow of muddy water and a mooring method of the pollution prevention device.

  Conventionally, in ponds and dam lakes (artificial lakes, natural lakes), turbid water is distributed by dripping membranes into water to prevent the inflow and outflow of muddy water caused by revetment work, dredging work, and rain. A turbidity prevention device is used to prevent this. This pollution control device mainly has a weight chain attached to the lower end of a horizontally long rectangular film body using canvas or the like, and this film body is attached to a float in which a buoyant body is housed. A suspended structure is used. Such a pollution prevention device is moored by connecting both ends of the float with anchor ropes made of wire or the like to anchors provided on opposite banks.

  The pollution control device thus stretched has the following problems. In other words, when the water level of the water area where the pollution control device is stretched decreases, the slope of the submerged shore is exposed when the water is full, and the side edge of the pollution prevention device follows the slope where the float is exposed. It will be in the state where it came out on the water surface. Even if wind blows in this state, the membrane body is not beaten by its own weight, the pollution prevention device is pushed downstream by the water flow, the anchor rope is in a tensioned state, and the float at the side end is exposed to the water surface and exposed When it comes to a state where it floats from the slope, the underlying film becomes susceptible to wind, so it is blown by the wind and flutters and is damaged by repeatedly rubbing against the slope. The same thing happens when a strong wind is generated that pushes the pollution control device and puts the anchor rope in tension.

In addition to this, a pollution prevention device that anchors not only an anchor rope but also an auxiliary rope is known. This pollution control device connects both ends of the float and a pair of anchors installed on both sides of the dam lake with anchor ropes. They are moored by connecting the underwater anchors respectively arranged by the auxiliary ropes (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-120582 (FIGS. 1 and 5)

  When the one end of the auxiliary rope is connected to the underwater anchor as in the pollution prevention device, the auxiliary rope is slackened when the water level is lowered. Therefore, when the pollution control device is pushed into the water flow with the water level lowered, only the anchor rope is in tension, and the float at the side end of the pollution control device is the same as the pollution control device without the auxiliary rope. It floats from the surface of the water and exposed slope, and the film body is blown by the wind and damaged. If the length of the auxiliary rope is shortened to prevent it from slackening, the anchor rope may become slack when the pollution control device is poured into the water flow, or the float will not float to the water surface when the water level rises. There are inconveniences such as being submerged.

  Therefore, an object of the present invention is to provide a pollution control device and a mooring method for the pollution control device that can prevent the film body from being damaged when the water level is lowered.

In order to solve the above-mentioned problem, in the pollution prevention device according to claim 1, a film body having a weight attached to the lower end is suspended from a horizontally long float, and both longitudinal ends of the float are respectively on opposite shores. In the pollution control device, each of the auxiliary ropes is connected to each anchor by a mooring cable, and one end of the auxiliary cable is moored by being attached to both sides in the longitudinal direction of the float at a distance from the end of the float. Auxiliary rope attachment portions for attaching one end of the rope are provided at locations located at both ends of the portion floating on the water surface at the lowest water level of the float, and the other end of the auxiliary rope is fixed to the shore, and the length of the auxiliary strip, even when the water level is lowered, so that the slack is generated in the portion extending in the auxiliary strip mounting portion of the float through the tether from the anchor It is characterized in that setting.

  According to the pollution prevention apparatus of this claim 1, the auxiliary rope attachment portions are respectively provided at positions located at both ends of the portion floating on the water surface at the lowest water level of the float, and the length of the auxiliary rope is set. By setting the part (side end part) of the float from the anchor to the auxiliary cable attachment part via the mooring cable to be loosened, it is possible to prevent the film body from being damaged due to a drop in the water level.

  In other words, when a water flow is generated in the stored water due to discharge or a wind that passes near the surface of the water is generated, the pollution prevention device is not pushed downstream or leeward by the auxiliary cable in a tension state. To be detained. At this time, since the water pressure and wind pressure received by the side end portion of the pollution control device are small, the side end portion of the pollution control device 1 is maintained in a slack state without being pushed downstream or leeward.

  Then, when the water level is lowered, the slope of the shore that has been submerged is exposed, and a part of the side end portion of the pollution prevention device is exposed to the exposed slope, and the surface is on the water surface. . Since the side end portion of the pollution control device is in a slack state, a part of the side end portion on the slope surface comes out on the water surface along the slope where the float is exposed. Therefore, the film body is not easily affected by the wind and is not easily damaged by the wind due to its own weight, so that the film body is prevented from being damaged. Note that the position of the auxiliary cable attachment portion and the length of the auxiliary cable are determined so that the side edge part is slack even when the water surface falls to the lowest water level and the entire length of the side edge part protrudes above the water surface. Therefore, the film body can be prevented from being damaged unless the water supply amount becomes zero or lower than the minimum water level.

The mooring method of the pollution control device according to claim 2 is characterized in that the pollution control device in which a film body with a weight attached to the lower end is suspended from a horizontally long float, and both ends in the longitudinal direction of the float are opposed to each other. And a mooring method for a pollution control device that is moored by connecting one end of an auxiliary rope at a distance from the end of the float on each side in the longitudinal direction of the float. One end of each of the auxiliary ropes is attached to both ends of a portion that floats on the water surface at the lowest water level of the float, and the other end is attached to the mooring rope from the anchor of the pollution control device even when the water level is lowered. as slack occurs through partially reaching the auxiliary strip mounting position of the float, it is characterized in that fixing to the each shore.

  According to the mooring method of the pollution control device according to claim 2, the pollution control device is slackened at a portion (side end) from the anchor to the auxiliary cable attachment position of the float via the mooring cable. In addition, since one end of the auxiliary rope is attached to both ends of the floating surface at the lowest water level of the float, the pollution control device of the pollution control device can be used as long as the water supply amount is not zero. Breakage of the film body can be prevented.

  That is, when the water level is lowered, a part or the whole length of the side end portion of the pollution control device comes out on the water surface along the slope where the float is exposed. When a water flow or wind is generated in this state and the pollution prevention device is pushed down to the downstream side or leeward side, the auxiliary rope is in a tensioned state and pulls the pollution prevention device to the upstream side or the windward side. However, since the water pressure and wind pressure acting on the side end are small, this portion is maintained in a relaxed state. Therefore, the film body at the side end portion of the pollution control device that is on the surface of the water is not easily affected by the wind, and moreover, it is difficult to be blown by the wind due to its own weight.

  And, since one end of the auxiliary rope is attached to both ends of the floated portion of the float at the lowest water level, unless the water surface falls below the lowest water level and the water supply amount becomes zero, the pollution control device The part which has come out on the water surface is maintained in a slack state, and damage to the film body is prevented.

  The mooring method of the pollution control device according to claim 3 is characterized in that the other end of each auxiliary rope is connected to each anchor.

  According to the mooring method for the pollution control device according to the third aspect, the labor for installing the anchor for connecting the auxiliary cable can be saved, so that the mooring action of the pollution control device is simplified.

  1. According to the pollution control device of the present invention, even when the water level is lowered, the film body of the pollution control device is not easily damaged, so that it can be used for a long time without repair or the like.

  2. According to the mooring method of the pollution control device of the present invention, even when the water level is lowered, the membrane body of the pollution control device is not easily damaged, so that the troubles such as repair can be saved and the service life can be extended. And since it is not necessary to change the structure of a pollution prevention apparatus largely, it can implement easily.

  3. According to the mooring method for the pollution control device of the present invention, the anchor for the mooring cable and the anchor for the auxiliary cable can be made common, so that the trouble of installing the anchor for the auxiliary cord can be saved, and the tension of the pollution prevention device can be reduced. Easy installation work.

  Hereinafter, the pollution prevention device and the mooring method of the pollution prevention device according to the present invention will be described with reference to FIGS.

  FIG. 1A is an overhead view showing a state in which the pollution prevention device 1 is installed in the dam lake 100. The pollution prevention device 1 is stretched in a state of crossing the dam lake 100 on the upstream side of the dam 102, and the spillway of the dam 101 is caused by muddy water flowing into the dam lake 100 from the upstream river due to rain or the like. The turbidity of the stored water nearby is suppressed.

  The pollution prevention device 1 is formed in a tube shape with a cloth material such as a canvas, and is formed of a canvas or the like on a float 2 in which a polystyrene foam is housed as a buoyant body. The film body 3 to which is attached is suspended. This pollution control device 1 is stretched across the dam lake 100 from one shore upstream of the laying body 101 to the opposite shore, and anchor ropes (mooring lines) 4 are attached to the anchors 10 respectively installed on both shores. And an auxiliary rope (auxiliary rope) 5 are moored.

  As shown in FIG. 1 (b), two anchor ropes 4 are provided on each side of the float 2 in the longitudinal direction, and one end of each anchor rope 4 is provided at a pair of float 2 ends. It is connected to the mounting bracket 2a. The anchor rope 4 is represented by a single line for convenience in FIG. 1A and FIGS. Each of the mounting brackets 2a is attached to both ends of two tension belts 2b sewn side by side vertically along the longitudinal direction at the lower end of the float 2. The length of each anchor rope 4 is set such that both ends in the longitudinal direction of the float 2 are floated near the shore slope 102 when the water is full.

  On the other hand, as shown in FIG. 1 (c), two auxiliary ropes 5 are provided on both sides in the longitudinal direction of the float 2, and one end of each auxiliary rope 5 is provided on both sides in the longitudinal direction of the float 2. It connects with the attachment metal fitting 2c (attachment part for auxiliary ropes) provided at intervals from the end of the float 2. The auxiliary rope 5 is represented by a single line for convenience in FIG. 1A and FIGS. Each mounting bracket 2c is attached to the upper and lower tension belts 2b in a state of being arranged one above the other.

  The length of each auxiliary rope 5 is set to be shorter than the length (side end portion) from the anchor 10 through the anchor rope 4 to the mounting bracket 2c of the float 2, and the mounting bracket 2c of the float 2 is floated. It is provided so that it may be located in the both ends of the part which floats on the water surface at the time of 2 minimum water level.

  As described above, when the pollution prevention device 1 is moored using the anchor rope 4 and the auxiliary rope 5 described above, for example, when the pollution prevention device 1 is pushed downstream by a water flow, the auxiliary rope 5 is in a tensioned state. Thus, the auxiliary rope 5 supports most of the water pressure acting on the pollution control device 1. On the other hand, the side end portion of the pollution prevention device 1 is in a slack state because the water pressure is small.

  When the water level of the dam lake 100 is lowered and the shore slope 102 that has been submerged is exposed, a part or the entire length of the side edge of the pollution control device 1 is exposed to the exposed slope 102, and the float 2 is the slope. 102, the film body 3 at the side end of the pollution control device 1 on the water surface is not easily affected by the wind and is swept into the wind by its own weight. It will not be damaged by contact with the slope 102.

  And since the attachment metal fitting 2c which connects the auxiliary rope 5 is provided so that it may be located in the both ends of the part which floats on the water surface at the time of the minimum water level of the float 2, the water surface falls below the minimum water level and the dam lake 100 As long as the water use storage amount does not become zero, the side end portion of the pollution prevention device 1 can be maintained in a slack state. In other words, the membrane 3 at the side end of the pollution control device 1 that is on the water surface is prevented from being damaged by contact with the exposed slope 102 unless the water reserve of the dam lake 100 becomes zero. is there.

  Since the auxiliary rope 5 of the pollution prevention device 1 shares the anchor 10 of the anchor rope 4, the mooring work of the pollution prevention device 1 is not required, and one end is attached to the land anchor 10. Therefore, even when the water surface falls, it can be used reliably, and the loose state of the side end portion of the pollution prevention device 1 can be maintained.

  Next, the effect | action of the pollution prevention apparatus 1 accompanying the fall of the water level of the dam lake 100 is demonstrated.

  FIG. 2 represents the dam lake 100 when it is full. When the dam lake 100 is full, the pollution preventing apparatus 1 is in a state where both ends of the float 2 are located near the shore slope 102 and the entire length of the float 2 floats on the water surface. Therefore, since the film body 3 of the pollution prevention device 1 is in a state of being submerged in water, the film body 3 is not affected by the wind and is not damaged by being blown by the wind.

  When the water level falls from the full water state, as shown in FIG. 3, the shore slope 102 that has been submerged when the water is full is exposed. This FIG. 3 has shown the state which a part of side edge part of the pollution prevention apparatus 1 has come out on the water surface.

  In this state, when a water flow in the direction of the dam body 101 (in the direction of the arrow in the figure) is generated in the stored water of the dam lake 100, the pollution prevention device 1 is pushed downstream by the water pressure, and the auxiliary rope 5 is in tension. become. Even if it becomes like this, since the side edge part of the pollution prevention apparatus 1 is in the slack state, a part of the side edge part of the pollution prevention apparatus 1 which has come out on the water surface is the method in which the float 2 was exposed. The film body 3 is in a state of being in contact with the surface 102, is not easily affected by the wind, and is not blown by the wind due to its own weight, and is not damaged by contact with the slope 102.

  FIG. 4 shows a state where the water level of the dam lake 100 has further decreased to reach the lowest water level. In the pollution prevention device 1, the portion that appears on the water surface is long, and almost the entire length of the side end portion of the pollution prevention device 1 is on the slope 102.

  In this state, even when a water flow occurs in the direction of the arrow in the figure, the side end of the pollution prevention device 1 is in a slack state, so that the pollution prevention on the water surface is the same as in FIG. Since the side end of the device 1 comes out on the surface of the water with the float 2 following the slope 102, the film body 3 is hardly affected by the wind and can be blown by the wind by its own weight. And no damage due to contact with the slope 102 occurs.

  Thus, even if the water level of the dam lake 100 is lowered, the film body 3 of the pollution prevention device 1 is not damaged, so that troubles such as repair can be reduced and the useful life of the pollution prevention device 1 can be extended. Further, if the mounting bracket 2a of the auxiliary rope 5 is arranged at the upper end portion of the float 2, even when the water flow is reversed, that is, when a flow opposite to the arrow direction occurs, the side end portion of the pollution prevention device 1 Can be in a relaxed state.

  In the embodiment of the mooring method for the pollution control device, the pollution control device is moored using a total of four anchor ropes and auxiliary ropes in pairs, but naturally the anchor rope and the auxiliary rope are It is also possible to moor each side of the pollution control device using one each. And although an anchor rope and an auxiliary rope are attached to a common anchor, you may make it provide and provide an anchor separately. In this case, the anchor for the auxiliary rope is installed on the upstream side or the windward side of the anchor rope. In addition, one auxiliary rope is attached to each of the both surfaces corresponding to the front and back of the membrane body, and these two auxiliary ropes are connected to the upstream side and the downstream side (or the leeward side and the leeward side) of the anchor for the anchor rope. Attaching to the anchors provided in each can make use of the auxiliary rope even when the wind direction is reversed.

  The float of each auxiliary rope pollution prevention device is fixed over the entire length, but is not limited to this, and a part of the float may be floated / sinked, or the entire length may be floated / sinked.

(A) is the bird's-eye view which shows the state which installed the pollution prevention apparatus in the dam using the mooring method of the pollution prevention apparatus concerning this invention, (b) is the elements on larger scale of the A section in Fig.1 (a). (B) is the elements on larger scale of the B section in FIG.1 (b). It shows the time when the dam where the pollution control device is installed is full, (a) is an overhead view of the side end of the pollution control device, and (b) is a view seen from the front side. It shows the state when the water level of the dam where the pollution control device is installed is lowered, (a) is an overhead view of the side end of the pollution control device, (b) is a view seen from the front side is there. It shows the state when the dam where the pollution control device is installed reaches the minimum water level, (a) is an overhead view of the side end of the pollution control device, and (b) is a view seen from the front side. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pollution prevention apparatus 2 Float 2a Mounting bracket 2b Tension belt 2c Mounting bracket 3 Film body 4 Anchor rope 5 Auxiliary rope 10 Anchor 100 Dam 101 Dam body 102 Slope

Claims (3)

A membrane body with a weight attached to the lower end is suspended from a horizontally long float, and both longitudinal ends of the float are connected to anchors installed on opposite shores by mooring lines, In the pollution control device in which one end is moored by being attached to both sides in the longitudinal direction of the float at a distance from the end of the float,
Auxiliary rope attachment portions for attaching one end of the auxiliary rope are provided at locations located at both ends of the portion that floats on the water surface at the lowest water level of the float, and the other end of the auxiliary rope is fixed to the shore. In addition, the length of the auxiliary rope is set so that slack occurs in a portion from the anchor to the attachment portion for the auxiliary rope via the mooring line even in a state where the water level is lowered. A pollution control device characterized by having The anti-contamination device in which the film body with the weight attached to the lower end is suspended from the horizontally long float is connected to the anchors installed on the opposite shores by mooring lines at both ends in the longitudinal direction of the float, respectively. It is a mooring method of a pollution control device moored by attaching one end of an auxiliary cable spaced from the end of the float on each side in the longitudinal direction of the float,
Attach one end of both of the auxiliary ropes to both ends of the part that floats on the water surface at the lowest water level of the float,
The other end, even when the water level is lowered, the as slack from the anchor of pollution control device in a portion leading to the auxiliary strip mounting position of the float via said mooring occurs, fixed to the each shore A method of mooring a pollution control device, characterized in that   The mooring method for a pollution control device according to claim 2, wherein the other end of each auxiliary rope is connected to each anchor.

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