Dust outflow suppression device

Abstract

To provide a garbage outflow suppressing device that is not affected by an amount of garbage, water flow, etc., effectively prevents tilting of a net, more reliably dams up driftwood, garbage, etc., and can be expected to prevent outflow to a downstream side.SOLUTION: A garbage outflow suppressing device comprises: a float 12 having buoyancy and floating on water; a net 14 connected to the float 12 and stretched at least partially underwater; and tilt suppressing means 16 having a pressing member 28 made of a rigid body vertically provided so as to be long along the net 14 and capable of suppressing tilting of the net 14 in a water flow direction W.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a garbage outflow prevention device that can prevent driftwood, wood chips, garbage, other flotsam, garbage, and the like from flowing downstream in dams, reservoirs, rivers, and the like. [Background technology]

[0002] In dams and reservoirs, driftwood blocking facilities (net sites) are installed to block driftwood, garbage, and the like flowing from upstream and prevent them from flowing downstream (see, for example, Patent Document 1). 8 As shown in (a), a conventional fishing net 100 uses a configuration including a float section 102 consisting of multiple floats connected together at intervals in the horizontal direction, a net 104 suspended from the float section 102 for capturing floating objects such as driftwood and garbage FD, and a chain 106 for a weight attached to the lower end of the net 104 to prevent it from being rolled up by water currents, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-197547 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional fishing nets are widely used in various regions, but in the structure of conventional fishing nets, when there is a large amount of driftwood, garbage, trash, etc. flowing from upstream due to heavy rain or typhoons, or when the water flow is fast, the net 104 of the fishing net 100 may tilt diagonally as shown in Fig. 8(b), and driftwood, trash, etc. FD may pass under the tilted net, causing a risk of reducing the damming function. In particular, in bad conditions such as when an extremely large amount of driftwood, trash, etc. FD flows in at once, the net 104 may tilt almost to the water surface WL, and in some cases it may become almost unable to function as a fishing net, causing problems such as damage to downstream facilities.

[0005] Also, in order to prevent the net at the fishing spot from tilting due to a large amount of driftwood or water currents, it is possible to consider, for example, increasing the weight of the weight at the bottom of the net at a conventional fishing spot. However, in this case, the weight of the weight must be set to be equal to or less than the buoyancy of the floats that suspend the net, so there is a limit to how much it can be increased, which is a problem of low practicality.

[0006] In other words, conventional net field structures have problems in that they are unable to fully perform their blocking function depending on the amount of driftwood and the conditions of the installation location, and there is a demand for the development of a system that can more reliably block driftwood, debris, and the like.

[0007] The present invention has been made in consideration of the above-mentioned problems in the conventional art, and one of its objectives is to provide a garbage outflow prevention device that is less affected by the amount of garbage or water currents, effectively prevents the net from tilting, and can more reliably block driftwood, garbage, etc., thereby preventing them from flowing downstream. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a float 12 having buoyancy that floats on water, a net 14 connected to the float 12 and at least a portion of which is stretched underwater, and a tilt suppression means 16 having a rigid pressing member 28 that is provided vertically along the net 14 and capable of suppressing the tilt of the net 14 in the water flow direction W. The tilt suppression means 16 has a tilt suppression float 32 arranged on one or both sides of the net in the water flow direction at the upper part of the net 14, and has one or more units (20) formed by connecting the upper end of the pressing member 28 to a base body 34 that connects the tilt suppression float 32, and the tilt suppression means 16 has the unit (20) provided so that it can be attached to the net 14 or the float 12 later.It is composed of a garbage outflow prevention device 10.

[0009] The lower end of the pressing member 28 of the tilt suppression means 16 may be set at the same position as the lower end of the net 14 or may be extended downward beyond the lower end of the net 14.

[0010] The tilt suppression means 16 may also include a weight 30 attached to the lower end side of the pressing member 28 .

[0011] The tilt suppression means 16 may also include a weight adjustment means 40 that can adjust the weight of the weight 30 .

[0012] In addition, the tilt suppression means 16 may have a plurality of pressure members 28 arranged at predetermined intervals along the lateral direction of the net 14, horizontal cord-like bodies 36 stretched between adjacent pressure members 28, and vertical cord-like bodies 38 connecting the horizontal cord-like bodies 36 to the net 14.

[0013] Furthermore, the present invention provides a net field tilt suppression unit 20 attached to a net field 18 comprising a float 12 having buoyancy that floats on the water and a net 14 connected to the float 12 and at least a portion of which is stretched underwater, the unit comprising a tilt suppression float 32 that can be detachably attached to the upper end side of the net field, a rigid pressing member 28 that is connected to the tilt suppression float 32 and is provided vertically along the net 14 of the net field, and the pressing member Material The tilt suppression unit 20 is composed of a tilt suppression unit 28 and a weight 30 attached to the lower end of the tilt suppression unit 28. Effect of the Invention

[0014] The garbage outflow prevention device of the present invention includes a float having buoyancy that floats on the water, a net connected to the float and at least a part of which is stretched underwater, and a tilt prevention means having a rigid pressing member arranged vertically along the net and capable of preventing the net from tilting in the direction of the water flow, so that the rigid pressing member increases the moment that prevents the net from tilting, and as a result of maintaining the position of the net, it is possible to reliably hold a large amount of driftwood, garbage, etc. Also, by configuring the pressing member of the tilt prevention means to extend downward longer than the lower end of the net or to include a weight attached to the lower end side of the pressing member, it is possible to generate a large moment that prevents the net from tilting, and the resistance of the net against garbage can be improved. [Brief description of the drawings]

[0015] [Figure 1] 1 is a front view of a garbage outflow prevention device according to an embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view of the garbage outflow prevention device of FIG. 1 taken along line AA. [Diagram 3] FIG. 2 is a schematic plan view showing an installation state of the garbage outflow prevention device of FIG. [Figure 4] FIG. 2 is an enlarged explanatory view of an upper portion of the garbage outflow prevention device of FIG. [Diagram 5] 2 is an explanatory diagram of the garbage outflow prevention device of FIG. 1 in a separated state from the tilting prevention means. [Figure 6] 2 is an explanatory diagram of the operation of the garbage outflow prevention device of FIG. 1. [Figure 7] FIG. 13 is an enlarged explanatory view of another embodiment of the tilt suppression unit of the garbage outflow suppression device of the present invention, with some parts omitted. [Figure 8] (a) is a schematic diagram of a conventional fishing net field, and (b) is a schematic diagram of the fishing net field with the net tilted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the garbage outflow suppression device of the present invention will be described with reference to the attached drawings. The garbage outflow suppression device of the present invention is a driftwood stopping device that is installed in various water areas such as dams and reservoirs, and can prevent driftwood, garbage, garbage, etc. flowing from upstream from adversely affecting downstream dam facilities, rivers, etc. Figures 1 to 6 show one embodiment of the garbage outflow suppression device of the present invention. As shown in Figures 1, 2, and 3, the garbage outflow suppression device 10 of this embodiment includes a float 12, a net 14, and a tilt suppression means 16 including a pressing member 28 attached to the net 14.

[0017] In this embodiment, for example, an example in which the garbage outflow suppression device 10 is installed in a dam DM will be described. As shown in Fig. 3, the garbage outflow suppression device 10 is erected so as to cross the water flow direction W of the dam DM transversely, and is installed so as to divide the water area. The garbage outflow suppression device 10 is configured by forming a net field 18 with a float 12 and a net 14, and combining the net field 18 with a tilt suppression means 16. In this embodiment, garbage FD includes driftwood, plants, garbage, its flotsam, driftwood, and other garbage.

[0018] The float 12 is a buoyancy support means that has buoyancy to float on the water and buoyantly supports the net 14. In this embodiment, the float 12 is configured, for example, with approximately the same structure as that of a conventional net field. As shown in Figures 1 and 4, the floats 12 are arranged at a predetermined interval via two upper and lower ropes 22a and 22b that are hung across the dam DM. The floats 12 are set to a predetermined buoyancy by filling the inside of a substantially cylindrical float made of synthetic resin with a hollow interior with polystyrene foam or air. The size, shape, buoyancy, number, etc. of the floats 12 may be arbitrary. Each float 12 is connected to the upper and lower ropes 22a and 22b in a fixed position via connecting parts provided on the upper and lower ends.

[0019] The upper and lower ropes 22a, 22b connecting the multiple floats 12 are installed substantially parallel to each other at intervals that correspond to the vertical width of the floats 12. Both ends of the upper and lower ropes 22a, 22b are fixed to both banks BK of the dam DM via anchors 24. The length of the upper and lower ropes 22a, 22b is formed to be longer than the transverse length of the dam DM so that it can respond to changes in water depth, etc.

[0020] The net 14 is connected to the float 12 and is installed so that at least a part of it is placed in the water, and is a net body for preventing the outflow of garbage, etc., which captures and blocks driftwood, garbage FD, etc. flowing from the upstream side while allowing water to flow. In this embodiment, the net 14 is formed, for example, of a flexible material and is formed with a mesh size that allows water to flow while capturing garbage FD of a certain size. As shown in FIG. 1, the net 14 is composed of, for example, an upper net part 14a stretched between the upper rope 22a and the lower rope 22b and between the adjacent floats 12, and a lower net part 14b stretched horizontally below the float 12 and the upper net part 14a, i.e., below the lower rope 22b.

[0021] The upper net section 14a is flexibly stretched with its upper side connected to the upper rope 22a, its lower side connected to the lower rope 22b, and both left and right sides connected to the float 12. The lower net section 14b is flexibly stretched with its upper side connected to the lower rope 22b and its lower end attached with a metal weight chain 26 as a weight to prevent the net from rolling up due to water flow, etc. In FIG. 26 is attached at a position directly below the floats 12 in correspondence with the installation positions of the plurality of floats 12. The chain 26 may be attached to the entire lower end of the net 14, or may be attached intermittently at any interval. In addition, when the tilt suppression means 16 sufficiently prevents the net 14 from tilting, the configuration may be such that the chain 26 is not provided at the lower end of the net 14.

[0022] The tilt suppression means 16 is a net tilt suppression means for preventing or suppressing the lower end of the net 14 from tilting at such a large angle that the lower end moves toward the water surface as a result of moving in the direction of the water flow more than the upper end side. Even when a relatively large load is placed on the net 14 when a large amount of driftwood, garbage FD, etc. is washed away by the net 14 or when the net site is set up in a place with fast water flow, the tilt suppression means 16 effectively prevents or suppresses the net 14 from tilting, and can prevent garbage FD, etc. from flowing out from below the net.

[0023] 1, 2, 4 and 5, in this embodiment, the tilt suppression means 16 includes a rigid pressing member 28 and a weight 30 attached to the lower end of the pressing member 28. The tilt suppression means 16 further includes a tilt suppression float 32 connected to the pressing member 28, the tilt suppression float 32 being arranged opposite each other on both sides of the upper side of the net 14. The opposing tilt suppression floats 32 are connected to each other via a base body 34, and the base body 34 The upper end of the pressing member 28 is connected to the

[0024] In this embodiment, two pressing members 28, a weight 30 arranged at the lower end of the pressing members 28, two tilt suppressing floats 32 arranged opposite each other on both sides of the net 14, and a base body 34 connecting the tilt suppressing floats to each other are configured as one unit to form the tilt suppressing unit 20. A plurality of tilt suppressing units 20 are attached to the lateral direction of the net 14 at predetermined intervals and function as the tilt suppressing means 16. In other words, the tilt suppressing means 16 includes a plurality of tilt suppressing units 20.

[0025] As shown in Figs. 1 and 2, in this embodiment, the rigid pressing member 28 is provided linearly in the vertical direction along the net 14. The pressing member 28 is a long straight member such as a square pipe or a square bar made of a hard metal material such as stainless steel. The pressing member 28 is a long rigid member that holds a relatively large moment due to its high rigidity and length. As a result, the moment of the pressing member 28 is generated in the reverse rotation direction to resist the force acting to tilt the net 14 due to a large load such as a large amount of garbage FD or a fast-flowing water current, and the net 14 can be prevented or suppressed from tilting significantly to maintain its position. As a result, the net can reliably block the garbage. It is preferable that a plurality of pressing members 28 are arranged at predetermined intervals along the lateral direction of the net 14.

[0026] The pressing member 28 is installed along the net surface of the net 14 on the downstream side in the water flow direction, and a U-shaped bolt 31 for attaching to the lower rope 22b is removably attached to the upper side of the pressing member 28, and a threading part 29 with a rope hole for connecting to the lower end of the net 14 (lower net part 14b) via a rope is protruded from the middle position of the longitudinal direction of the pressing member 28, and the pressing member 28 is attached to the net field 18 via the U-shaped bolt 31 and the threading part 29. The upper end of the pressing member 28 is set at approximately the same position as the upper end of the upper net part 14a, and the lower end of the pressing member 28 is extended further downward than the lower end of the lower net part 14b. That is, the pressing member 28 is set longer than the vertical length of the net 14 in order to generate a certain degree of large moment. For example, in Figs. 1 and 2, the length of the pressing member 28 is set to about 2.5 times the vertical length of the net 14. The length of the pressing member 28 depends on the water depth, etc., but if it is set to about 2 to 4 times the vertical length of the net 14, a relatively large moment can be expected. The pressing member 28 may be set to a length substantially equal to the vertical length of the net 14, and the lower end of the pressing member 28 may be provided at substantially the same position as the lower end of the net 14. The pressing member 28 is not limited to being provided in a straight line, and may be a long member bent in a substantially L-shape at an intermediate position toward the water flow direction. The pressing member 28 may be a rod-shaped member having a circular, elliptical, or polygonal cross section, a flat plate-shaped member, or any other structure. The pressing member 28 and the net 14 may be fixed by any method, such as a rope, string, band, metal fitting, or the like, and may be fixed in a detachable or non-detachable manner.

[0027] The weight 30 is attached to the lower end of the pressing member 28, and is a weight means that can increase the moment acting in the tilt suppression means 16 in the direction of suppressing the tilt of the net 14 by the pressing member 28, thereby improving the function of maintaining the posture of the net 14, i.e., preventing the net 14 from tilting. As shown in Figs. 1 and 2, in this embodiment, the weight 30 is made of a metal such as lead having a high specific gravity and formed into a cylindrical shape, and is attached so as to connect the lower ends of the two pressing members 28. In the multiple tilt suppression units 20 that constitute the tilt suppression means 16, one weight 30 is fixed to the lower end of the pressing member 28 for each tilt suppression unit 20 by welding or the like.

[0028] The magnitude of the moment by the pressing member 28 and the weight 30 of the tilt suppression means 16 may be designed, for example, taking into consideration the maximum depth of the garbage FD to be captured by the net 14, calculated under design conditions, etc. As shown in Fig. 6, the net 14 stops at a position of balance between a moment M1 that tends to tilt the net 14 generated by the garbage when the designed maximum depth of the garbage FD is reached, and a moment M2 in the opposite direction to the moment M1 that is generated by the tilt suppression means 16. Therefore, the magnitude of the moment M2 by the tilt suppression means 16 may be set so that the lower end of the net 14 tilted at this balance position is positioned below the designed maximum depth D of the garbage FD.

[0029] As shown in FIG. 7, one or more weights 30 may be detachably attached to the lower end of the pressing member 28, and a weight adjustment means 40 may be provided to adjust the weight of the weight. In this case, the weight of the weight, i.e., the magnitude of the moment acting to suppress the inclination of the net, can be adjusted while installation according to the environment and conditions of the installation location. In FIG. 6, for example, a bolt shaft 42 protrudes from a first weight 301 fixed to the lower end of the pressing member 28. One or more second weights 302 with a through hole 43 drilled therein are prepared. After the bolt shaft 42 is inserted into the through hole 43 of the second weight 302, it is fastened and fixed by a nut 44. The weight can be adjusted by increasing or decreasing the number of second weights 302. In addition, the weight adjustment means 40 may be any adjustment mechanism, such as preparing multiple weights of the same size or different sizes and attaching one or more weights via removable fixing means such as hooks or bolts.

[0030] The tilt suppression float 32 is a buoyancy means different from the float 12 of the net field 18, and is a second float body that exerts a buoyancy corresponding to the weight of the pressing member 28 and the weight 30, and cooperates with the pressing member 28 to maintain the position of the net 14, i.e., prevents the net 14 from tilting. As shown in Figs. 1, 2, 4, and 5, in this embodiment, the tilt suppression floats 32 are installed facing each other on both sides of the upper net portion 14a of the net 14, and the upper ends of the facing tilt suppression floats 32 are connected to each other by a base body 34. The tilt suppression float 32 is formed in approximately the same configuration as the float 12 described above. The magnitude of the buoyancy of the tilt suppression float 32 is set corresponding to the weight of the pressing member 28 and the weight 30, and cooperates with the float 12 to buoyantly support the entire garbage outflow suppression device 10 on the water with a predetermined buoyancy. Tilt suppression floatThe tilt suppression units 32 are connected to the holding member 28 and are disposed on both sides of the net 14 so that when the net 14 tries to tilt, as shown in Fig. 5, buoyancy acts on one side that is submerged in the water, while gravity acts on the other side that is raised into the air, so that they function to return the net 14 to its original position and suppress the tilt of the net 14. 20 By setting the mounting width (opposing distance) between the tilt suppression floats 32 arranged opposite each other on both sides of the net 14, i.e., in the upstream and downstream directions of the water, to a large value, the stability of the tilt suppression unit 20 against tilting can be increased, and ultimately the tilt prevention and tilt suppression effect of the net 14 can be improved.

[0031] The base body 34 connects the tilt suppression floats 32 together, and is vertically fixed to the upper ends of the two pressing members 28, and serves as a base for connecting the members that constitute the tilt suppression unit 20 together. As shown in Figs. 1 and 4, the base body 34 is formed, for example, in a rectangular plate shape, and is connected to the tilt suppression float 32 by arranging the tilt suppression float 32 inside the U-shaped inner space of the locking band 33, which is approximately U-shaped when viewed from the side. For example, the locking band 33 is attached by a fixing means such as a screw by abutting the mounting end portions 33a, which are formed in an approximately L-shape at both ends of the U-shape, against the base body 34. At approximately the center of the upper surface side of the base body 34, a hanging support piece 35 with a rope hole through which a rope can be fastened when the tilt suppression unit 20 is hoisted with the rope or the like is protruded upward. At approximately the center of the lower surface side of the base body 34, an upper rope of the net field 18 is attached. 22a The tilt suppression unit 20 is provided with a connecting means to the net field, such as a U-bolt 37 for connecting to the net field 18. Thus, the tilt suppression unit 20 has an attachment means to the net field 18, which is composed of the U-bolt 37 of the base body 34, the U-bolt 31 of the pressing member 28, the rope and the engagement part 29, etc. Also, a rod-shaped receiving part 39 for maintaining the position is fixed to the attachment position of the tilt suppression float 32 on the underside of the base body 34. The base body 34 may be formed in any shape, such as a plate, frame, or rod of a predetermined shape.

[0032] Since the tilt suppression unit 20 is configured by integrating the holding member 28, the weight 30, the tilt suppression float 32, and the base body 34 as described above, the tilt suppression means 16 can be easily realized by simply attaching one or more tilt suppression units 20 to the existing net field 18, and the garbage outflow suppression device 10 of this embodiment can be configured. This allows the installation of the garbage outflow suppression device 10, which has a high and practical function of blocking garbage, etc., at low cost and in a short period of time. For example, as shown in FIG. 5, the tilt suppression unit 20 floated from the downstream side is brought close to the existing net field, and the tilt suppression float 32 is moved so as to straddle the upper net part 14a of the net field, and the net 14 is placed between the two tilt suppression floats 32. Then, with the holding member 28 in contact with the net surface of the net 14, the holding member 28 is fastened and fixed to the net 14, rope, etc. via a mounting means such as a string, rope, or U-bolt. Similarly, the tilt suppression units 20 are attached to the net at predetermined intervals according to the lateral length of the net field 18. The configuration of the tilt suppression units 20 may be arbitrary, for example, the number and positions of the tilt suppression floats 32, the number of the holding members 28, the positions, number and weights of the weights, the mounting structure to the net 14 and net field 18, etc. may be arbitrary.

[0033] As shown in Fig. 1, a horizontal cord 36 made of a rope is installed between the lower ends of the pressing members 28 of adjacent tilt suppression units 20. The horizontal cord 36 may be fixed directly to the pressing members 28, but in Fig. 1, it is connected via weights 30. Furthermore, the horizontal cord 36 and the lower ends of the net 14 are connected by vertical cords 38 made of rope at predetermined intervals along the longitudinal direction of the horizontal cord 36. This effectively prevents the net 14 between the pressing members 28 from bending or rolling up.

[0034] Also, Fig. 3As shown in FIG. 1, the garbage outflow suppression device 10 of this embodiment is equipped with a breaker device 50 that breaks the rope 22a (22b) when a load of a predetermined load or more is applied to the net field 18. In this embodiment, the tilt suppression means 16 as described above is attached to the net 14, so that the pressure receiving surface area below the water surface is increased, and there is a risk that the tension applied to the net field 18 will be excessive when a large amount of garbage or the like is received. In order to prevent this, the breaker device 50, which is set to physically break at the design load, is inserted and installed in the middle of the rope 22a of the net field 18. The breaker device 50 may be installed at multiple points on the rope 22a depending on the water area site, etc., or may not be installed at all.

[0035] Next, the operation of the garbage outflow suppression device 10 according to this embodiment will be described with reference to the drawings. For example, when the garbage outflow suppression device 10 is installed in a dam DM or the like where the water flow is relatively slow, the net 14 is arranged in a state along the substantially vertical direction or in a state close to that, and captures and blocks the garbage FD, such as driftwood and garbage, flowing from the upstream side. For example, as shown in FIG. 6, when the amount of garbage FD, etc. flowing from the upstream increases, the horizontal vector pushing the net 14 increases due to the load of the garbage FD, etc., and a force acts to tilt the net so that the lower end side of the net moves forward more than the upper end side. In response to this, the pressing member 28 and the weight 30 of the tilt suppression normal 16 work together to apply a moment in the opposite direction to the force that tilts the net 14, thereby preventing and suppressing the net 14 from tilting at a large angle. As a result, the outflow of the garbage to the downstream side caused by the net 14 being significantly tilted can be effectively prevented, the garbage FD can be reliably blocked, and adverse effects on the downstream side can be prevented.

[0036] The garbage outflow prevention device of the present invention described above is not limited to the configuration of the above-mentioned embodiment, and any modification may be made without departing from the essence of the present invention described in the claims. [Industrial Applicability]

[0037] The garbage outflow suppression device of the present invention can be effectively used to block garbage and the like by installing it in any water area such as a dam, a reservoir, a river, etc. [Explanation of symbols]

[0038] 10 Dust flow control device 12 Float 14. Net 16 Tilt suppression means 18 Fishing spot 20 Tilt Restraint Unit 28 Pressing member 30 Weight 32 Tilt control float 34 Base body 36 Transverse funiculus 38 Longitudinal cord 40 Weight adjustment means

Claims

1. A float having buoyancy that floats on water; A net connected to the float and at least a portion of which is stretched in water; and a tilt suppression means having a rigid pressing member provided vertically along the net and capable of suppressing the tilt of the net in the water flow direction. the tilt suppression means has a tilt suppression float disposed on one or both sides of the net in the water flow direction at the upper portion of the net, and has one or more units formed by connecting the upper end of the pressing member to a base body that connects the tilt suppression float, The tilt suppression means is a garbage outflow suppression device characterized in that the unit is provided so as to be able to be attached to the net or the float afterwards.

2. 2. A garbage outflow prevention device as described in claim 1, characterized in that the lower end of the pressure member of the tilt prevention means is set at approximately the same position as the lower end of the net, or is extended downward longer than the lower end of the net.

3. 3. The garbage outflow prevention device according to claim 1, wherein the tilt prevention means includes a weight attached to a lower end side of the pressing member.

4. 4. The garbage outflow prevention device according to claim 3, wherein said tilt prevention means includes weight adjustment means for adjusting the weight of said weight.

5. The tilt suppression means includes a plurality of pressing members arranged at predetermined intervals along the lateral direction of the net, A horizontal cord-like body is installed between the adjacent pressing members; 5. A garbage outflow prevention device according to claim 1, further comprising vertical cords connecting said horizontal cords and said net.

6. A net tilt suppression unit to be attached to a net fishing spot, the net comprising a float having buoyancy that floats on the water and a net connected to the float and at least a portion of which is stretched underwater, A tilt suppression float that can be attached to the top of the net of the fishing net field; A rigid pressing member connected to the tilt suppression float and provided long in the vertical direction along the net; A net field tilt suppression unit characterized by comprising a weight attached to the lower end of the pressing member.

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