Fish egg and fry damage monitoring device for channel blasting construction

Abstract

The invention discloses a fish egg and fry damage monitoring device for channel blasting construction in the field of river regulation, which comprises a counterweight part with a water inlet at the bottom; the fixing part is detachably connected to the top of the counterweight part, and a fixing piece is arranged on the fixing part; the sealing part is detachably connected to the top of the fixing part, an air outlet is formed in the top of the sealing part, and the sealing part, the fixing part and the sealing part are in a hollow egg shape in the mounting state; the device has the beneficial effects that the counterweight part is arranged to realize counterweight of the device, the counterweight part, the fixing part and the sealing part are egg-shaped, so that internal eggs can be well protected, the whole device is similar to a tumbler, and the device can be well prevented from falling in water to influence the experiment precision.

Description

Technical Field

[0001] The invention relates to the technical field of river regulation, and in particular to a device for monitoring fish eggs and fry damage during channel blasting construction. Background Art

[0002] Blasting and reef clearing is currently the main construction technology for removing reefs that hinder navigation in mountainous rivers in the upper reaches of the Yangtze River. However, the instantaneous shock waves generated by blasting and reef clearing will affect the organisms in the waters near the blasting point. In order to reduce the impact of blasting and reef clearing on sensitive habitats and aquatic organisms, non-blasting and reef clearing technologies such as impact hammer and drilling combined underwater reef breaking, minimally invasive high-frequency crushing, and integrated milling and digging reef breaking have gradually made breakthroughs. However, due to unfavorable factors such as low efficiency, strong vibration, and high noise, they can only serve as an effective supplement to blasting and reef clearing technology. Whether it is blasting or mechanical reef clearing technology, its impact on habitats and aquatic organisms should be paid attention to. Due to the lack of active avoidance ability, fish eggs and fry are more susceptible to the impact of blasting shock waves, so they should be paid special attention during underwater blasting construction. With the trend of increasing requirements for ecological protection and sustainable development, while ensuring the effect of blasting and reef clearing, avoiding irreversible impacts on drifting fish eggs and fry is a technical problem that needs to be solved urgently in waterway regulation projects.

[0003] The existing monitoring of the damage of fish eggs and fry by blasting shock waves mainly adopts fish cages for fixed-point monitoring. However, the existing monitoring device for the impact of shock waves on fish eggs and fry adopts a mesh fish cage structure. Due to the high intensity of river water flow, the eggs and fry die due to excessive water flow in a short time after entering the water, which causes a large error in the actual monitoring of the impact of underwater blasting shock waves on the survival rate of fish eggs and fry. Secondly, the fish cage has a light density and cannot sink quickly in the water flow, and often floats. Therefore, additional weights are required, which makes the experimental process very cumbersome and the accuracy is not high.

[0004] Therefore, we propose a device for monitoring the damage of fish eggs and fry during waterway blasting construction. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a device for monitoring damage to fish eggs and fry during waterway blasting construction.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is:

[0007] A device for monitoring damage to fish eggs and fry during channel blasting construction comprises: a counterweight portion, a water inlet is provided at the bottom, the counterweight portion is used to keep the device below the water surface and keep it vertical without tilting; a fixing portion, detachably connected to the top of the counterweight portion, a fixing piece is provided on the fixing portion; a sealing portion, detachably connected to the top of the fixing portion, an air outlet is provided at the top of the sealing portion, and the sealing portion, the fixing portion and the sealing portion are in a hollow egg shape in the installed state.

[0008] The weight of the entire device is increased by arranging a counterweight at the bottom, so that the device can directly enter below the water surface, and the counterweight can make the device form a tumbler, keeping the device in an upright state below the water surface, so as to ensure that when the device is thrown into a river, the water inlet is at the bottom to ensure that water flows into the device. When in use, the sealing part is disassembled, fish fry and fish eggs are put in, and the sealing part is installed, and the entire device is placed in water. The device can be fixed by a fixing piece to prevent the device from being washed away by the water flow. The single-peak curved surface shape similar to that of an egg can ensure that the device can be fully filled with water, and no residual air is left inside the device to affect the propagation of shock waves. Compared with existing fish cages, the device can better protect the eggs and fry from being affected by the water flow state of the river.

[0009] It is further defined that the sealing portion is made of a soft deformable material; the use of a soft deformable material to make the sealing portion allows the sealing portion to be folded and stored after the experiment, and the device can continue to be used for subsequent egg and seedling rearing.

[0010] It is further defined that the counterweight portion is made of zinc-aluminum alloy and a counterweight block is provided at the bottom, and the water inlet penetrates the counterweight block.

[0011] It is further defined that a first external thread is provided on the top of the counterweight part, and a first internal thread matching the first external thread is provided on the bottom of the fixing part, and the fixing part is fixed to the counterweight part by the cooperation of the first external thread and the first internal thread; the stability and sealing of the connection between the counterweight part and the fixing part can be ensured by the connection of the first external thread and the first internal thread.

[0012] It is further defined that a second external thread is provided on the top of the fixing part, and a second internal thread matching the second external thread is provided on the bottom of the sealing part, and the sealing part is fixed to the fixing part by the cooperation of the second external thread and the second internal thread; the stability and sealing of the connection between the fixing part and the sealing part can also be ensured by the connection of the second external thread and the second internal thread.

[0013] It is further defined that the fixing member is a hanging ring; the fixing member is arranged as a hanging ring for easy connection.

[0014] It is further defined that the sealing portion is made of polyvinyl chloride and the fixing portion is made of polycarbonate.

[0015] The beneficial effects of the present invention are as follows: the device is weighted by arranging a counterweight portion; the counterweight portion, the fixing portion and the sealing portion are in the shape of an egg, which can well protect the internal egg seedlings; the whole is similar to a tumbler, which can well prevent the device from tipping over in the water and affecting the experimental accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded schematic diagram of the front view of the present invention;

[0017] Figure 2 It is an exploded schematic diagram of the three-dimensional state of the present invention from a top-down perspective;

[0018] Figure 3 It is an exploded schematic diagram of the three-dimensional state of the present invention when viewed from an upward perspective;

[0019] Figure 4 This is a diagram of the state of fry after underwater impact in the existing device under the microscope;

[0020] Figure 5 This is a diagram of the state of fish eggs after underwater impact in the existing device under a microscope;

[0021] Figure 6 The state diagram of the fry after underwater impact in the device of the present invention under a microscope;

[0022] Figure 7 The figure is a state diagram of fish eggs after underwater impact in the device of the present invention under a microscope.

[0023] The symbols of the components are as follows:

[0024] The counterweight part 1 , the water inlet 11 , the first external thread 12 , the fixing part 2 , the hanging ring 21 , the first internal thread 22 , the second external thread 23 , the sealing part 3 , the air outlet 31 , and the second internal thread 32 . DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0026] Example:

[0027] like Figure 1-Figure 3As shown, a device for monitoring damage to fish eggs and fry during waterway blasting construction comprises a counterweight part 1, a fixing part 2 and a sealing part 3; a water inlet 11 is provided at the bottom of the counterweight part 1, the counterweight part 1 is made of zinc-aluminum alloy and a counterweight block is provided at the bottom, the water inlet 11 penetrates the counterweight block, and the counterweight part 1 is used to keep the device below the water surface and keep it vertical without tilting; the fixing part 2 is made of polycarbonate, a first external thread 12 is provided at the top of the counterweight part 1, a first internal thread 22 matching the first external thread 12 is provided at the bottom of the fixing part 2, and the fixing part 2 is fixed to the counterweight part 1 by the first external thread 12 and the first internal thread 22; a hanging ring 21 is provided on the fixing part 2; a second external thread 12 is provided at the top of the fixing part 2 23, a second internal thread 32 matching the second external thread 23 is provided at the bottom of the sealing part 3, and the sealing part 3 is fixed on the fixing part 2 by the second external thread 23 and the second internal thread 32; an air outlet 31 is provided at the top of the sealing part 3, and the sealing part 3 is made of polyvinyl chloride; the sealing part 3, the fixing part 2 and the sealing part 3 are in the shape of a hollow egg in the installed state, and a filter screen with an aperture of 2mm is arranged in the water inlet 11 and the air outlet 31 to prevent the escape of the smaller egg seedlings, and a water inlet piston is arranged. After the test, the water inlet can be closed, the sealing part 3 is disassembled, the counterweight part 1 is separated from the fixing part 2, and the counterweight part 1 is clamped in the top opening of the fixing part 2 to directly carry out subsequent cultivation of the egg seedlings.

[0028] The weight of the entire device is increased by arranging a counterweight 1 at the bottom, so that the device can directly enter below the water surface, and the counterweight 1 can make the device form a tumbler, keeping the device in an upright state below the water surface, so as to ensure that when the device is thrown into the river, the water inlet 11 is at the bottom to ensure that water flows into the device. When in use, the sealing part 3 is disassembled, the fry and fish eggs are put in, and the sealing part 3 is installed, and the entire device is placed in the water. The device can be fixed by the fixing parts to prevent the device from being washed away by the water flow. The single peak surface shape similar to that of an egg can ensure that the device can be fully filled with water without residual air inside the device. The invention affects the propagation of shock waves, and can better protect the fry from the influence of the water flow state of the river compared with the existing fish cage; the sealing part 3 is made of soft and deformable material, so that the sealing part 3 can be folded and stored after the experiment, and the device can be used for subsequent fry rearing; the stability and sealing of the connection between the counterweight part 1 and the fixed part 2 can be ensured by connecting the first external thread 12 and the first internal thread 22; the stability and sealing of the connection between the fixed part 2 and the sealing part 3 can also be ensured by connecting the second external thread 23 and the second internal thread 32; the fixing part is set as a hanging ring 21 for easy connection.

[0029] Comparative test: The device of the present invention and the traditional monitoring fish cage were used as control groups. A certain amount of fish eggs and fry were placed in the two devices. The two devices were lowered into the river water at the same time. They were placed in the river water for ten minutes. After that, the devices were removed from the water surface. The survival rate of the eggs and fry and the degree of damage to the fry in the two devices were observed. The results are shown in Table 1 and Table 2. Figure 4-Figure 7 As shown:

[0030] Table 1 Survival rate of eggs and fry of the device of the present invention and the fish cage

[0031]

Claims

1. A device for monitoring damage to fish eggs and fry during waterway blasting construction, characterized in that: include: A counterweight part (1) is provided with a water inlet (11) at the bottom, and the counterweight part (1) is used to keep the device below the water surface and to keep it vertical without tilting; A fixing part (2) is detachably connected to the top of the counterweight part (1), and a fixing piece is provided on the fixing part (2); The sealing part (3) is detachably connected to the top of the fixing part (2); an air outlet (31) is provided on the top of the sealing part (3); and the sealing part (3), the fixing part (2) and the sealing part (3) are in a hollow egg shape in the installed state.

2. The device for monitoring damage to fish eggs and fry during waterway blasting construction according to claim 1, characterized in that: The sealing portion (3) is made of a soft and deformable material.

3. The device for monitoring damage to fish eggs and fry during waterway blasting construction according to claim 2, characterized in that: The counterweight portion (1) is made of zinc-aluminum alloy and has a counterweight block at the bottom, and the water inlet (11) is arranged through the counterweight block.

4. The device for monitoring damage to fish eggs and fry during waterway blasting construction according to claim 3 is characterized in that: The top of the counterweight part (1) is provided with a first external thread (12), and the bottom of the fixing part (2) is provided with a first internal thread (22) matching the first external thread (12); the fixing part (2) is fixed to the counterweight part (1) by the first external thread (12) and the first internal thread (22).

5. The device for monitoring damage to fish eggs and fry during waterway blasting construction according to claim 4, characterized in that: The top of the fixing portion (2) is provided with a second external thread (23), and the bottom of the sealing portion (3) is provided with a second internal thread (32) matching the second external thread (23), and the sealing portion (3) is fixed to the fixing portion (2) by the cooperation of the second external thread (23) and the second internal thread (32).

6. The device for monitoring damage to fish eggs and fry during waterway blasting construction according to claim 1, characterized in that: The fixing piece is a hanging ring (21).

7. The device for monitoring damage to fish eggs and fry during waterway blasting construction according to claim 2, characterized in that: The sealing part (3) is made of polyvinyl chloride, and the fixing part (2) is made of polycarbonate.

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