JP6964405B2 - Dredging intake structure - Google Patents

Description

The present invention relates to an intake port for taking in mud in a dredging machine for dredging mud accumulated on the bottom of water such as lakes and ponds.

There is an urgent need to take measures against soil pollution caused by radioactive cesium diffused by the accident at the Fukushima Daiichi Nuclear Power Station in March 2011. In particular, soil adsorbing radioactive cesium flows into the water area due to rainfall or the like and accumulates on the bottom of closed water areas such as lakes and ponds, resulting in an increase in the concentration of radioactive cesium. If such a closed water area is an agricultural reservoir, it will recontaminate the cultivated land, and if it is a fishing ground, it will cause pollution of marine products, and urgent measures are desired.

It is known that mud pollution on the bottom of the water has a high degree of pollution in the surface layer and a low degree of pollution in the deep part. Therefore, a considerable amount of contaminated mud can be removed by dredging the mud having a depth of several cm to several tens of cm on the surface layer of the water bottom with a dredging device.

In the conventional dredging device, for example, in order to efficiently suck mud even when the water bottom is hard or contains a lot of stones, for example, a stirring blade having a blade at the tip is provided on the rotating shaft, and the stirring blade is provided. It was to rotate the water to scrape the bottom of the water and suck the mud. However, such a conventional dredging device has a problem that there is a risk of diffusing radioactive cesium calming down at the bottom of the water into the water.

Therefore, there has been a demand for a technique for dredging mud with a dredging device without diffusing radioactive cesium that has settled on the bottom of the water into the water. Patent Document 1 is for solving such a problem.

Japanese Unexamined Patent Publication No. 2016-118808

In Patent Document 1, it is sandwiched between an upper surface that protrudes at least a part from the lower surface described later in the traveling direction, a lower surface that is at least partially retracted from the upper surface in the traveling direction, and an upper surface and a lower surface. A dredging intake structure consisting of an intake opening that opens in the direction of travel, a fence that is provided in the intake opening and prevents the pipe from being clogged when sucked, and an intake port. Is described. According to the technique described in Patent Document 1, the provision of the fence suppresses the inhalation of foreign substances such as fallen leaves and aquatic plants, and contaminates the bottom of the water with radioactive cesium without causing clogging of the suction pipe. It was possible to provide a dredging intake structure suitable for dredging mud.

However, there remains a problem that the suction pipe may be clogged because it sucks in elongated objects such as aquatic plants and mud lumps that flow in from between the fences. Therefore, a technique capable of preventing clogging of the suction pipe in the dredging intake structure has been desired.

Therefore, in order to solve the above problems, the following dredging intake structure and the like are provided in the present invention. That is, the upper surface, the back surface arranged at the rear end in the traveling direction of the upper surface, the side surface, the intake port provided near the lower end of the back surface for sucking up mud or sand to be dredged, and the opening in the traveling direction. The opening formed from the substantially front end of the upper surface to the lower end of the back surface, the fence formed from the substantially front end of the upper surface to the lower end of the back surface to prevent the intake port from being clogged, and the fence. Provided is a dredging intake structure having a rotary cutter for crushing an elongated object such as aquatic grass flowing in from between and a lump of mud.

Further, the rotary cutter having the above-mentioned structure and further having a lower surface is described with a dredging intake port structure provided on the upper side of the portion having the lower surface as a reference form.

Further, it has the above-mentioned structure, and further has a cutter pump opening for sucking an elongated object such as waterweed flowing from between the fences and a crushed object such as a mud mass, and the rotary cutter blade is the cutter pump. Provided is a dredging intake structure provided in the vicinity of the opening.

Further, the dredging intake structure is provided which has the above-mentioned configuration and in which the rotary cutter is arranged so that the rotary shaft of the rotary cutter is substantially perpendicular to the upper surface. Further, the dredging intake structure is provided which has the above-mentioned configuration and in which the rotary cutter is arranged so that the rotary shaft of the rotary cutter is substantially perpendicular to the back surface.

Further, the rotary cutter blade having the above-mentioned configuration provides a dredging intake structure provided on the left and right in the dredging traveling direction.

Further, the intake port has the above-mentioned structure, and the intake port provides a dredging intake port structure composed of a cutter pump.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a dredging intake structure having a function of preventing clogging of a suction pipe due to suction of an elongated object such as aquatic plants flowing in from between fences or a lump of mud.

Conceptual diagram showing the structure of the entire dredging device Conceptual diagram showing an example of the dredging intake structure of the first embodiment Conceptual diagram showing an example of the dredging intake structure of the first embodiment Conceptual diagram showing an example of the dredging intake structure of the first embodiment Conceptual diagram showing an example of water flow generated by a rotary cutter Conceptual diagram showing an example of water flow generated by a rotary cutter Conceptual diagram showing an example of the dredging intake structure of the second embodiment Conceptual diagram showing an example of the dredging intake structure of the third embodiment Conceptual diagram showing an example of the cutter pump of the third embodiment Conceptual diagram showing an example of the dredging intake structure of the fourth embodiment Conceptual diagram showing an example of the dredging intake structure of the fifth embodiment Conceptual diagram showing an example of the dredging intake structure of the seventh embodiment.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. The present invention should not be limited to these embodiments, and may be implemented in various embodiments without departing from the gist thereof.

Hereinafter, embodiments of the present invention will be described. The present invention should not be limited to these embodiments, and may be implemented in various embodiments without departing from the gist thereof. The relationship between the embodiment and the claims is as follows. The first embodiment mainly relates to claim 1 and the like. The second embodiment mainly relates to claim 2 and the like. The third embodiment mainly relates to claim 3 and the like. The fourth embodiment mainly relates to claim 4 and the like. The fifth embodiment mainly relates to claim 5 and the like. The sixth embodiment mainly relates to claim 6 and the like. The seventh embodiment mainly relates to claim 7.
<Embodiment 1>
<Embodiment 1: Overview>

The dredging intake structure according to the present embodiment is provided with a fence for preventing objects of a size that the intake is clogged from entering the intake, but an elongated structure such as waterweed flowing in from between the fences is provided. It is characterized by being provided with a rotary cutter for crushing a lump of things or mud and preventing clogging in the suction pipe.
<Embodiment 1: Configuration>
(Structure of dredging machine using dredging intake structure)

FIG. 1 is a conceptual diagram showing the structure of the entire dredging device, and is a conceptual diagram showing a mode of dredging mud on the bottom of the water by the dredging device using the dredging intake port structure according to the present embodiment. As shown in the figure, the “dredging intake structure” (0100) of the present embodiment is connected to the moving shaft (0131), and the support trolley (0132) supporting the moving shaft is attached to the trolley (0133). By moving on the rail (0134) to be laid, it moves while dredging the bottom of the water (0135). In the drawing, there is an intake opening for taking in mud in the traveling direction (0107) of the dredging intake structure indicated by the arrow, and the taken in mud passes through the suction pipe (0136) and the pump (0137). ) And the like, and it is stored in a predetermined container (0138). Here, since the dredging intake structure is provided with a rotary cutter (0109), elongated objects such as aquatic plants and mud lumps that have flowed in from between the fences when the mud on the bottom of the water is dredged are crushed. After that, it is taken into the suction pipe. The mud collected in this way is used for a predetermined decontamination treatment or disposal treatment.
(Structure of dredging intake structure)

FIG. 2 is a conceptual diagram showing an example of the dredging intake structure of the present embodiment. The dredging intake structure (0200) includes a top surface (0201), side surfaces (0202a, 0202b), a back surface (0203a, 0203b), a fence (0204) existing at an opening portion, and an intake port (0208). There is. This dredging intake structure moves mud (0205), sand (0206), etc. in the traveling direction (0207), scoops them from between the fences of the opening, and sucks them up to the intake. Elongated objects such as aquatic plants (0211) and mud lumps that flow in from between the fences are crushed by a rotary cutter (0209), and the crushed foreign matter (0212) passes through the intake port to the suction pipe (0236). It is sucked up.

The back surface is arranged at the rear end of the upper surface in the traveling direction. The shape of the back surface may be a convex shape or a bow shape having the intake port portion as the apex as shown in FIG. 2, or may be a flat plate. However, a convex shape or a bow shape having the intake port as the apex is more desirable because there is no unevenness in the portion where the suction force of the intake port is transmitted.

3 and 4 are conceptual diagrams showing an example of the dredging intake structure of the present embodiment. In FIGS. 3 and 4, (a) is a conceptual diagram when the dredging intake structure of the present embodiment is viewed from above, (b) is from the front, and (c) is from the side. Of these, FIG. 3 is a diagram showing a basic configuration of a dredging intake structure. On the other hand, FIG. 4 is a diagram showing a basic configuration including a moving shaft for advancing the dredging intake structure as a part of the dredging device.

In FIG. 3, from above (a), the upper surface (0301), the side surfaces (0302a, 0302b), and the back surface (0303a, 0303b) can be observed, and it can be seen that the intake port (0308) is provided on the back surface. Two rotary cutters (0309a, 0309b) are provided on the upper surface on the left and right in the dredging traveling direction (0307), and are arranged close to the intake port. Next, (b) from the front, the fences (0304a to h) provided on the upper surface (0301), the side surfaces (0302a, 0302b), and the opening (0313) can be observed, and the intake port (0308) is provided. You can see that there is. The rotary cutters (0309a, 0309b) are arranged so that the rotation axis is substantially perpendicular to the upper surface. It can be seen that the rotary cutter blades (0310a, 0310b) are located above the dredging intake structure and are close to the upper surface. Next, from the side (c), the upper surface (0301), the side surface (0302b), and the back surface (0303b) can be observed, and it can be seen that the intake port (0308) is provided on the back surface. The shape of the fence (0304) when observed from the side is configured to draw a gentle curve from the substantially front end of the upper surface to the lower end of the back surface. By drawing a gentle curve, it is possible to prevent sand and mud from being dug up and rolled up. Note that, unlike FIG. 4, in FIG. 3, there is no moving shaft for advancing the dredging intake port structure as a part of the dredging device, but the suction pipe (0336) connected to the intake port is not provided. ) Can be used to apply force in the forward direction to move it.

In FIG. 4, unlike FIG. 3, a moving shaft (0431) for advancing the dredging intake structure is provided as a part of the dredging device. Since the configuration other than the moving shaft is the same as that in FIG. 3, the description thereof will be omitted.

Next, the fence provided in the opening plays a role of preventing an object having a size in which the intake port is clogged from the substantially front end of the upper surface toward the lower end of the back surface into the opening. The width of the opening divided by the fence is a width that does not allow stones and other substantially spherical objects that accumulate on the bottom of the water to have a size that clogs the intake port, and does not impair the intake efficiency. It is desirable to have. Specifically, it is desirable that the width is narrower than the diameter of the intake port. For example, it is desirable that the width is half or less of the diameter of the intake port, and when the diameter of the intake port is 20 cm, the opening width divided by the fence is 10 cm or less.

On the other hand, elongated objects such as tree branches, aquatic plants, and plastic debris that accumulate on the bottom of the water are substantially parallel to the fence, even if the length of one end is longer than the opening width separated by the fence. It is also assumed that it will enter the opening in the direction. In addition, clay mud is often deposited on the bottom surface of lakes and marshes, but when clay mud is dredged from the intake, it is cut into strips by a fence and dredging intake structure. May invade. It is assumed that the suction pipe will be clogged if this clay-like band-shaped mud mass or elongated object is sucked up from the intake port as it is. Therefore, in the present embodiment, elongated objects such as aquatic plants flowing in from between the fences and mud lumps are crushed by a rotary cutter to prevent clogging of the suction pipe.
(Rotary cutter)

The rotary cutter has a function of crushing elongated objects such as aquatic plants and mud lumps that flow in from between fences. The rotary cutter includes a rotary cutter blade and a motor for rotating the cutter, and the rotary cutter blade and the motor are connected by a rotary shaft. The rotary cutter crushes things that may clog the suction pipe if sucked in as it is, such as relatively elongated objects that pass through between fences and lumps of clay mud. , Prevents clogging of the suction pipe. Since elongated objects such as aquatic plants are relatively light, they tend to rise upward in the dredging intake structure, and are therefore crushed by a rotary cutter blade provided close to the upper surface. On the other hand, a relatively heavy object such as a mud mass does not rise upward, but for example, if one end of the mud mass is larger than the diameter of the intake port, it rotates before being taken into the intake port. It comes into contact with the cutter blade and is crushed.

The material of the rotary cutter blade is not particularly limited, but since it is used in water, it is preferable to use a material that is resistant to rust and has strength, and for example, casting or stainless steel is desirable. Further, the shape of the rotary cutter blade is not particularly limited. The rotary cutter blade is equipped with a sharp blade for crushing elongated objects such as aquatic plants and mud lumps. The rotary cutter blade may be composed of one cutter, but it is preferable to include a plurality of cutters. The rotary cutter blade can be configured to directly fix the cutter to the drive shaft by a method such as screwing. The method of fixing the cutter is not particularly limited, but it is desirable to use a replaceable fixing method because the blade of the cutter may be worn due to use.

FIG. 5 is a conceptual diagram showing an example of a water flow generated by a rotary cutter. The rotation of the rotary cutter creates a water stream as shown in FIGS. 5A and 5B, and light objects such as aquatic plants are guided by the water stream and crushed by the rotary cutter blade. As the rotary cutter, a rotary cutter blade such as an impeller or an impeller, which is provided with a sharp portion and has a function of a rotary cutter blade, can be used as the rotary cutter blade. Further, a rotary cutter blade can be attached to these rotating bodies for use. When a rotating body such as an impeller or impeller is used in combination with a rotary cutter blade, aquatic plants are sucked into the water stream generated by the rotation of the rotating body, and after crushing, they are released on the water stream, so that they can be crushed efficiently. .. As shown in FIGS. 5C and 5D, these rotating bodies such as a rotary cutter blade, an impeller, and an impeller can be covered with a cover. By covering with a cover, aquatic plants and the like are sucked into the cover and brought into contact with the rotary cutter blade to be crushed, so that the crushing can be performed more finely.

FIG. 6 is a conceptual diagram showing an example of a water flow generated by a rotary cutter. The rotary cutter blade is preferably directly or indirectly connected to the rotary shaft and rotated, but in addition to the rotary cutter blade, cutter blades (0614a, 0614b) not connected to the rotary shaft as shown in FIG. 6 are used. You can also prepare. For example, it may be fixed to the upper surface or the back surface, or the cutter blade may be provided on the cover of a rotating body such as a rotary cutter blade, an impeller, or an impeller and fixed. When the rotary cutter blade connected to the rotary shaft rotates, a flow of water occurs, but foreign matter such as waterweed flows along the water flow, so it may be difficult to contact the rotary cutter, but the rotary cutter blade connected to the rotary shaft In addition to this, by fixing the cutter blade to the upper surface or the like, foreign matter such as waterweed comes into contact with the fixed cutter blade and is crushed. Further, the fixed cutter also has an effect of causing turbulence in the flow of water, so that foreign matter easily comes into contact with the rotary cutter blade and is easily crushed.

The motor must be sealed to prevent flooding as the rotary cutter is used underwater. The motor to be used is not particularly limited, but since it is used in a sealed space to avoid flooding, it is preferable to use a motor having excellent heat resistance and to provide a safety device against excessive temperature rise.

In FIGS. 1 to 4, the rotary cutter is provided on the upper surface of the dredging intake structure, but the position where the rotary cutter is provided is not limited to the upper surface, and may be a side surface or a back surface. However, if it is placed on the side surface, there is a high possibility that the motor of the rotary cutter will come into contact with the bottom of the water before dredging and stir the bottom of the water. , Or is preferably provided on the back surface. The method of fixing the rotary cutter to the dredging intake structure is not particularly limited, but it is preferable that the rotary cutter can be replaced. This is because the motor and cutter blade of the rotary cutter require maintenance such as inspection and replacement, and maintenance can be performed more easily if the rotary cutter can be removed. In addition, depending on the situation of the lake site where the dredging intake structure is used, for example, the power of the motor and the type of cutter depending on the situation such as the site where there are many long aquatic plants and the site where there are many hard mud lumps. This is because the rotary cutter can be selected by changing the above, and the rotary cutter mounting position can also be selected according to the situation at the site. In addition, if the rotary cutter blade inside the dredging intake structure is too close to the bottom surface of lakes, etc., the bottom surface may be rolled up by the water flow, so the mounting position of the rotary cutter blade can also be adjusted depending on the site conditions. preferable.
<Embodiment 1: Effect>

The dredging intake structure of the present embodiment has a function of preventing clogging of the suction pipe due to suction of elongated objects such as waterweeds flowing in from between fences and mud lumps. Can provide a body.
<Embodiment 2>
<Embodiment 2: Overview>

The dredging intake structure of the present embodiment is based on the embodiment, but is provided with a lower surface in order to prevent the bottom surface of lakes and marshes from being rolled up or scattered by the water flow generated by the rotary cutter. It is characterized in that it is provided on the upper side of a portion having a lower surface.
<Embodiment 2: Configuration>

FIG. 7 is a conceptual diagram showing an example of the dredging intake structure of the present embodiment. As shown in FIG. 7, the dredging intake structure of the present embodiment further has a lower surface (0721), and the rotary cutter (0709) is provided above the portion having the lower surface. However, as described above, it goes without saying that the present invention can be carried out without providing a lower surface. The upper surface (0701) protrudes in the traveling direction (arrow in the figure, 0707) relative to the lower surface, and is sandwiched between the upper surface and the lower surface to provide an intake port (0708). The rotary cutter is provided on the upper side of the part where the lower surface is located, and the rotating body such as the rotary cutter blade and the impeller of the rotary cutter rotates, and elongated objects such as aquatic plants (0711) flowing in from between the fences and mud lumps are removed. Smash. On the other hand, the bottom surface of lakes and marshes may be rolled up or scattered due to the water flow generated by the rotation of the rotary cutter and the flow of crushed foreign matter. However, in the present embodiment, since the rotary cutter is provided on the upper side of the portion where the lower surface is located, the lower surface is interposed between the rotary cutter and the bottom surface, and water flow and crushed material do not come into contact with the bottom surface such as lakes and marshes. It is possible to suppress the winding and scattering of the bottom surface. Therefore, in the dredging intake structure of the present embodiment, the bottom surface is not rolled up or scattered by the rotation of the rotary cutter, and a slender object such as crushed waterweed or a lump of mud can be dredged. It can be sucked up to the intake port together with the mud and sand dredged by the structure. In FIG. 7, the rotary cutter is provided on the upper surface of the dredging intake structure, but the position where the rotary cutter is provided is not limited to the upper surface, and may be a side surface or a back surface. However, as will be described later, it is preferable that the dredging intake structure is provided on the upper surface or the back surface.
<Embodiment 2: Effect>

The dredging intake structure of the present embodiment suppresses the winding or scattering of the bottom surface of lakes and marshes by a rotary cutter, and sucks in elongated objects such as aquatic plants and mud lumps that flow in from between fences. It is possible to provide a dredging intake structure having a function of preventing clogging.
<Embodiment 3>
<Embodiment 3: Overview>

The dredging intake structure of the present embodiment is based on the first and second embodiments, and the dredging intake structure has a cutter pump opening, and a rotary cutter blade provided in the vicinity of the cutter pump opening is provided. It is characterized by crushing elongated objects such as waterweeds flowing in from between fences and lumps of mud, and sucking the crushed substances from the opening of the cutter pump.
<Embodiment 3: Configuration>

FIG. 8 is a conceptual diagram showing an example of the dredging intake structure of the present embodiment. As shown in FIG. 8, the dredging intake structure of the present embodiment has a cutter pump opening (0822) for sucking elongated objects such as aquatic plants flowing in from between fences and crushed objects such as mud lumps. The rotary cutter blade (0810) is provided in the vicinity of the cutter pump opening. The cutter pump (0823) is equipped with a rotary cutter and has a pump function. It sucks elongated objects such as aquatic plants and mud lumps in the dredging intake structure together with water and crushes them with a rotary cutter. Plays a role of discharging to the suction pipe (0824). In FIG. 8, the cutter pump opening is provided on the upper surface, but can also be provided on the back surface or the side surface. However, as will be described later, it is preferable that the dredging intake structure is provided on the upper surface or the back surface. Further, in FIG. 8, the rotary cutter blade is provided above the cutter pump opening, but the position where the rotary cutter blade is provided may be near the cutter pump opening, for example, it may be provided below the cutter pump opening. can.

FIG. 9 is a conceptual diagram showing an example of a cutter pump provided in the dredging intake structure of the present embodiment. FIG. 9A is an example in which the suction tube (0924) is attached in the horizontal direction of the rotary cutter blade (0910), and FIG. 9B is an example in which the suction tube is attached above the rotary cutter blade. .. Dredging intake structure Elongated objects such as aquatic plants and mud lumps that have flowed into the body are sucked by the pump of the cutter pump near the cutter pump opening (0922), and the rotary cutter blade (0910) provided near the cutter pump opening. ) Is crushed. In FIGS. 9A and 9B, an example of the water flow (0926) in the vicinity of the opening of the cutter pump of the present embodiment is shown by a dotted line, but in the cutter pump housing, the action of suction of the pump and rotation of the rotating body Since the water flow as shown by the dotted line is generated by the water flow, slender objects such as waterweeds flowing in from between the fences and crushed objects such as mud lumps ride on the water stream and are attached to the suction pipe provided in the cutter pump. It is released. Since aquatic plants and the like are collected and crushed by the pump near the opening of the cutter pump provided with the rotary cutter blade, they are crushed more efficiently.

Since the water flow discharged from the rotating body is guided to the suction pipe in this way, the influence of the water flow discharged from the rotating body hardly reaches the inside of the dredging intake structure. In addition, elongated objects such as aquatic plants and crushed objects such as mud lumps are not discharged to the dredging intake structure, so that the crushed substances come into contact with the bottom surface of lakes and marshes, causing hoisting and scattering. Will not be. Although there is an influence of the water flow sucked by the rotating body, for example, when the cutter pump is provided on the upper surface as shown in FIG. 8, the rotating body such as the rotating cutter blade and the impeller is provided near the opening of the cutter pump. Since the bottom surface of lakes and marshes and the rotating body are separated, the effect is small. Further, even when the cutter pumps are provided on the back surface and the side surface, the lower surface is provided as described in the second embodiment, and the rotating body such as the rotary cutter blade and the impeller is provided above the portion where the lower surface is located. , The influence of water flow can be reduced and the bottom surface of lakes and marshes can be prevented from rolling up.

The installation location of the pump provided by the cutter pump is not particularly limited. For example, a suction pipe can be connected to a pontoon or a pump on the shore of a lake to suck crushed lake water or the like. It is also possible to connect the suction pipe to the suction pipe of the dredging machine. When the suction pipe is connected to the suction pipe, the crushed material is discharged by the pump of the dredging machine together with the mud and sand sucked by the suction pipe, so there is no need to install a new pump and the tank other than the pump. It is preferable because such facilities can be shared. On the other hand, a cutter pump having a built-in pump function can be provided in the dredging intake structure.
<Embodiment 3: Effect>

The dredging intake structure of the present embodiment suppresses the hoisting or scattering of the bottom surface of lakes and marshes due to the influence of the water flow of the rotating body such as the rotary cutter blade and the impeller, and the radioactive cesium calming down at the bottom of the water is submerged. It is possible to provide a dredging intake structure having a function of preventing clogging of the suction pipe due to suction without diffusing the suction pipe.
<Embodiment 4>
<Embodiment 4: Overview>

The dredging intake structure of the present embodiment is characterized in that the rotation axis of the rotary cutter is arranged so as to be substantially perpendicular to the upper surface.
<Embodiment 4: Configuration>

FIG. 10 is a conceptual diagram showing an example of the dredging intake structure of the present embodiment. As shown in FIG. 10, in the dredging intake structure of the present embodiment, the rotation axes (1025a, 1025b) of the rotary cutters (1009a, 1009b) are arranged so as to be substantially perpendicular to the upper surface. FIG. 10 shows an example in which two are provided on the left and right in the dredging traveling direction view, but the number of rotary cutters is not particularly limited. It is desirable to determine the number and arrangement of rotary cutters so that the dredging intake structure can proceed stably without vibrating or tilting. As will be described in detail later, as shown in FIG. 10, if two rotary cutter blades are provided on the left and right in the dredging traveling direction, the blade can proceed stably and is elongated such as aquatic plants flowing in from between the fences. It is desirable because it can more reliably crush lumps of mud and mud.

Since a fence or fence and a lower surface are provided at the contact portion between the dredging intake structure and the bottom surface of a lake or the like, if the rotation axis of the rotary cutter is arranged so as to be substantially perpendicular to the upper surface, Since the rotary cutter blade does not come into direct contact with the bottom surface of the lake or the like, the bottom surface of the lake or the marsh is not rolled up or scattered by the rotary cutter blade. It is also possible that the water flow of the rotary cutter may cause the bottom surface of lakes and marshes to wind up or scatter, but the rotation axis of the rotary cutter is placed approximately perpendicular to the top surface at an upper position where the water flow does not affect. Then, it is preferable because the winding can be prevented. FIG. 10 shows an example in which the lower surface is provided below the position where the rotary cutter is installed, but it is desirable to provide the lower surface because the influence of the water flow can be prevented.
<Embodiment 4: Effect>

The dredging intake structure of the present embodiment has a function of preventing clogging of the suction pipe, and the bottom surface of a lake or the like is rolled up or scattered by the rotation of the rotary cutter blade and the water flow generated by the rotation of the rotary cutter. It is possible to provide a dredging intake structure that does not diffuse the radioactive cesium that has calmed down at the bottom of the water into the water.
<Embodiment 5>
<Embodiment 5: Overview>

The dredging intake structure of the present embodiment is characterized in that the rotation axis of the rotary cutter is arranged so as to be substantially perpendicular to the back surface.
<Embodiment 5: Configuration>

FIG. 11 is a conceptual diagram showing an example of the dredging intake structure of the present embodiment. As shown in FIG. 11, in the dredging intake structure of the present embodiment, the rotation shafts (1125a, 1125b) of the rotary cutters (1109a, 1109b) are arranged so as to be substantially perpendicular to the back surface. Since the dredging intake structure is located in the front of the traveling direction and the rotating cutter is located in the rear, the resistance of water during traveling is reduced compared to the case where the rotating cutter is arranged on the upper surface or the side surface. can do. Therefore, it is easy to maintain the balance when proceeding, and less power is required when proceeding, so that energy saving such as electric power can be achieved.

When the rotation axis of the rotary cutter is arranged so as to be substantially perpendicular to the back surface, the direction in which elongated objects such as aquatic plants and mud lumps flowing in from between the fences flow toward the tackle opening and the rotation surface of the rotary cutter blade. Since is substantially vertical, it is easy to come into contact with aquatic plants and the like, and it becomes possible to crush more reliably. Further, as described in the second embodiment, the lower surface is provided, and the rotating body such as the rotary cutter blade and the impeller is provided above the portion where the lower surface is located. It is possible to prevent the bottom surface of lakes and marshes from being rolled up or scattered.

The number of rotary cutters is not particularly limited, but it is desirable to determine the number and arrangement of rotary cutters so that the dredging intake structure can proceed stably without vibrating or tilting. In addition, as will be described later, if two rotary cutter blades are provided on the left and right in the direction of dredging, stable progress can be achieved, and elongated objects such as aquatic plants and mud lumps flowing in from between the fences can be removed. It is particularly preferable because it can be crushed more reliably.
<Embodiment 5: Effect>

The dredging intake structure of the present embodiment has a function of preventing clogging of the suction pipe and can reduce the resistance of water during progress, so that the dredging intake structure advances. It is possible to provide a dredging intake structure that can easily maintain the balance and save energy.
<Embodiment 6>
<Embodiment 6: Overview>

The dredging intake structure of the present embodiment is characterized in that two rotary cutter blades are provided on the left and right in the dredging traveling direction.
<Embodiment 6: Configuration>

The dredging intake structure of the present embodiment is provided with two rotary cutter blades on the left and right in the dredging traveling direction. The rotary cutter blade of the dredging intake structure of the present embodiment is a rotary cutter blade provided in the rotary cutter and / or a rotary cutter blade provided in the cutter pump. FIG. 10 shows an example in which two rotary cutters are arranged so that the rotary axis of the rotary cutter is substantially perpendicular to the upper surface, and two rotary cutter blades are provided on the left and right in the direction of dredging. In this example, two rotary cutters are arranged so that the rotary axis of the rotary cutter is substantially perpendicular to the back surface, and two rotary cutter blades are provided on the left and right in the direction of dredging. The position to be used is not particularly limited. If two rotary cutter blades are provided on the left and right in the direction of dredging, it is easy to balance the dredging intake structure as it advances. Further, since two rotary cutter blades are provided on the left and right in the direction of dredging, it is possible to more reliably crush elongated objects such as aquatic plants and mud lumps flowing in from between the fences.
<Embodiment 6: Effect>

The dredging intake structure of the present embodiment has a function of preventing clogging of the suction pipe, and it is easy to maintain a balance when the dredging intake structure advances, and waterweeds flowing in from between fences, etc. It is possible to provide a dredging intake structure capable of more reliably crushing elongated objects and mud lumps.
<Embodiment 7>
<Embodiment 7: Overview>

The dredging intake structure of the present embodiment is characterized in that the intake is composed of a cutter pump, and elongated objects such as aquatic plants and a mass of mud are crushed in the vicinity of the intake.
<Embodiment 7: Configuration>

FIG. 12 is a conceptual diagram showing an example of the dredging intake structure of the present embodiment. FIG. 12 (a) is a conceptual diagram of a dredging intake structure in the vicinity of the intake (1208), and FIG. 12 (b) shows the dredging intake structure of FIG. 12 (a). It is a figure seen from the direction facing the traveling direction of. As shown in FIG. 12A, the intake port of the dredging intake port structure of the present embodiment is composed of a cutter pump (1209). Elongated objects such as aquatic plants and mud lumps flowing in from between the fences are crushed by a rotary cutter blade (1210) of a cutter pump provided near the intake port before being sucked into the suction pipe (1236). A cutter with a built-in pump function can be installed at the intake port, but for example, when the suction pipe is connected to the pump installed on the pontoon as shown in Fig. 1, the cutter is connected to the pump on the pontoon. The pump function of the pump can be substituted.

Mud and sand to be dredged will always pass through the intake port, so by installing a cutter pump at the intake port, compared to the case where a rotary cutter and / and a cutter pump are placed on the top and back, the fence It is possible to more reliably crush elongated objects such as aquatic plants and mud lumps that flow in from between. When there are many elongated objects such as aquatic plants flowing in from between the fences and a lot of mud lumps, it is desirable to install a cutter pump at the intake port and a rotary cutter or / and a cutter pump on the upper surface and the back surface.

If a cutter pump is provided at the intake port, the resistance of water during progress can be reduced. Therefore, it is easy to maintain the balance when proceeding, and less power is required when proceeding, so that energy saving such as electric power can be achieved. Furthermore, since the rotary cutter blade is provided near the intake port, the rotary cutter blade does not come into direct contact with the bottom surface of the lake, etc., so that the bottom surface of the lake, etc. is not rolled up or scattered. .. Further, since the water flow generated by the rotation of the rotary pump is sucked into the suction pipe in the vicinity of the intake port, it only flows in the direction of the suction pipe and does not occur in the direction of winding up the bottom surface of a lake or the like. Therefore, it is possible to prevent the bottom surface of lakes and marshes from being rolled up or scattered due to the water flow of the rotary pump.
<Embodiment 7: Effect>

The dredging intake structure of the present embodiment prevents the bottom surface of a lake or the like from being rolled up or scattered, and does not diffuse radioactive cesium calming down at the bottom of the water into the water. Furthermore, it is easy to maintain the balance when the dredging intake structure advances, and it more reliably crushes elongated objects such as waterweeds and mud clumps that flow in from between the fences, and prevents clogging of the suction pipe. It is possible to provide an intake structure for dredging.

Dredging intake structure: 0100, 0200
Top surface: 0201, 0301, 0701
Side: 0202, 0302
Back: 0203, 0303
Fence: 0204, 0304
Mud: 0205
Sand: 0206
Direction of travel: 0107, 0207, 0307, 0707
Intake port: 0208, 0308, 0708, 1208
Rotating cutters: 0109, 0209, 0309, 0709, 1009, 1109, 1209
Rotary cutter blade: 0310, 0810, 0910, 1210
Aquatic plants: 0211, 0711
Crushed foreign matter: 0212
Opening: 0313
Cutter blade not connected to the rotating shaft: 0614
Bottom surface: 0721
Cutter pump opening: 0822, 0922
Cutter pump: 0823
Suction tube: 0824, 0924
Rotation axis: 1025, 1125
Water flow near the opening of the cutter pump: 0926
Moving shaft: 0131, 0431
Support trolley: 0132
Vessel: 0133
Rail: 0134
Bottom of the water: 0135
Suction pipe: 0136, 0236, 0336, 1236
Pump: 0137
Container: 0138

Claims (6)

On the top and
The back surface located at the rear end in the traveling direction of the upper surface and the back surface
Side and
An intake port provided near the lower end of the back surface for sucking up mud and sand to be dredged,
An opening in the direction of travel, which is formed from the substantially front end of the upper surface to the lower end of the back surface.
A fence that is formed from the front end of the upper surface to the lower end of the back surface and is sized so that the intake port is clogged, and a fence that prevents the intake port from entering.
A rotary cutter for crushing elongated objects such as aquatic plants and mud lumps that flow in from between the fences.
Intake structure for dredging. It also has a cutter pump opening for sucking elongated objects such as aquatic plants flowing in from between the fences and crushed objects such as mud lumps.
The dredging intake structure according to claim 1, wherein the rotary cutter blade is provided in the vicinity of the cutter pump opening. The dredging intake structure according to claim 1 or 2, wherein the rotary cutter is arranged so that the rotary shaft of the rotary cutter is substantially perpendicular to the upper surface. The dredging intake structure according to claim 1 or 2, wherein the rotary cutter is arranged so that the rotary shaft of the rotary cutter is substantially perpendicular to the back surface. The dredging intake structure according to any one of claims 1 to 4, wherein the rotary cutter blade is provided on the left and right sides in the dredging traveling direction. The dredging intake port structure according to any one of claims 1 to 5, wherein the intake port is composed of a cutter pump.

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