A pile driving noise reduction device for an ocean pile driving system

Abstract

The invention relates to a pile driving noise reduction device for a marine pile driving system applied to the field of construction engineering. During pile driving, the air cover is entirely located underwater. When the noise is transmitted from the air cover to the outside of the air cover through the air cover, the noise is transmitted from the air to the water. The difference in acoustic impedance will cause a large number of sound waves to be reflected back into the air in the air cover, thereby weakening the propagation of the noise and improving the noise reduction effect on the pile driver. Moreover, when a small part of the noise entering the water is propagated onto the water, a large number of sound waves will be reflected back into the water, thereby greatly reducing the noise propagated on the water surface and greatly reducing the noise on the construction site. When it is necessary to reduce the noise propagated to the sea surface, the depth of the air cover can be appropriately increased by a suspension rope to extend the propagation distance of the noise, thereby quickly improving the noise reduction effect. At the same time, the gas discharged through the jet pipe forms a bubble curtain wall, thereby reducing the propagation distance of the noise in the water and reducing the impact on the marine ecosystem.

Description

Technical Field

[0001] The invention relates to a pile driving noise reduction device, in particular to a pile driving noise reduction device for a marine pile driving system applied in the field of construction engineering. Background Art

[0002] Offshore piling refers to the construction of piles in the ocean or other water bodies. It is usually used to build projects such as offshore platforms, docks, bridges or wind farms. This process involves driving pile foundations into the seabed to provide basic support for the structure.

[0003] The noise source of pile driving is the noise generated when the pile driver collides with the upper end of the pile foundation. The upper end of the pile foundation is generally on the sea surface. The noise on the sea surface will affect the construction workers and surrounding residents. The main coping method is to use a soundproof cover to block the pile driver and reduce the impact of noise on construction workers. However, the noise reduction effect is single and cannot be adjusted, so further improvement is needed. Summary of the invention

[0004] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the noise reduction effect of shielding the pile driver with a soundproof cover is single and cannot be adjusted, so further improvement is needed.

[0005] In order to solve the above problems, the present invention provides a pile driving noise reduction device for a marine pile driving system, comprising a lifting rope, the bottom end of which is fixedly connected to an air hood, a pile driver is installed on the inner wall of the top end of the air hood, the pile driver consists of a top head and a pressure head, two slide rails are fixedly connected between the top head and the pressure head, an impact head is slidably connected between the two slide rails, when the pile driver hammers the pile foundation, the impact head moves up and down along the slide rails to hammer the pile foundation, a pile entry hole is opened at the bottom end of the air hood, a sealing ring is fixedly connected to the inner wall of the pile entry hole, and also comprises a water pump and an air pump, one end of the water pump is fixedly connected to a downpipe, one end of the downpipe extends to the inner side of the bottom end of the air hood, one end of the air pump is fixedly connected to an air supply pipe, the bottom end of the air supply pipe extends to the inner side of the top end of the air hood, a plurality of evenly distributed jet pipes are fixedly connected to the outer wall of the air hood, a water level sensor is fixedly connected to the inner wall of the bottom end of the air hood, the water level sensor is electrically connected to the water pump, the water pump and the air pump are both located on the water surface, and the air hood is located underwater.

[0006] As a further improvement of the present application, the air injection pipe is composed of a horizontal section and a vertical section, and the inner wall of the horizontal section is fixedly connected to the air injection head.

[0007] As a further improvement of the present application, a plurality of evenly distributed fiber branches are fixedly connected to the inner wall of the vertical section, and a hydrophobic layer is provided on the surface of the fiber branches. Through the above arrangement, the waste of bubbles is reduced and the noise reduction effect of the bubble curtain wall is improved.

[0008] As a further improvement of the present application, the inner wall of the air hood is rotatably connected with a rotating tube, and the outer wall of the rotating tube is provided with a plurality of evenly distributed staggered holes, and the plurality of staggered holes correspond one-to-one to the plurality of air jet pipes.

[0009] As another improvement of the present application, a rack is slidably connected between the inner walls at both ends of the pile driver, a gearbox is fixedly connected to the inner wall of the pile driver close to the rack, an input end of the gearbox is fixedly connected to an input gear, and an output end of the gearbox is fixedly connected to an output gear.

[0010] As another improvement supplement of the present application, a gear ring is fixedly connected to the inner wall of the rotating tube, the gear ring is meshed with the output gear, and the input gear is meshed with the rack. Through the above arrangement, the gas in the pile driver can release bubbles outward according to the hammering action of the impact head, further improving the utilization effect of the bubble curtain wall.

[0011] To sum up, when piling, the air hood is located as a whole underwater. When the noise is transmitted from the inside of the air hood to the outside of the air hood, the noise is transmitted from the air to the water. The difference in acoustic impedance will cause a large number of sound waves to be reflected back into the air inside the air hood, weakening the propagation of noise and improving the noise reduction effect on the pile driver. In addition, when a small part of the noise that enters the water propagates toward the water, it will cause a large number of sound waves to be reflected back into the water, greatly reducing the noise propagating on the water surface, greatly reducing the noise on the construction site. When it is necessary to reduce the noise propagating to the sea surface, the depth of the air hood can be appropriately increased by using the lifting rope to extend the propagation distance of the noise, which can quickly improve the noise reduction effect. At the same time, the gas discharged through the jet pipe forms a bubble curtain wall, which can reduce the propagation distance of the noise in the water and reduce the impact on the marine ecosystem. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the overall front view of the first and second embodiments of the present application;

[0013] Figure 2 This is a front cross-sectional view of the jet pipe in the second embodiment of the present application;

[0014] Figure 3 This is a state diagram of bubbles attached to fiber branches in the second embodiment of the present application;

[0015] Figure 4 This is a front cross-sectional view of the gear ring in the second embodiment of the present application;

[0016] Figure 5 It is a top view cross-sectional view of the staggered holes and the air injection pipes when they are staggered with each other in the first and second embodiments of the present application;

[0017] Figure 6 This is a state diagram of the impact head driving the rack to move downward in the first and second embodiments of the present application;

[0018] Figure 7 This is a top view of the cross-section when the staggered hole and the air injection pipe overlap in the second embodiment of the present application.

[0019] Description of the numbers in the figure:

[0020] 1. Lifting rope; 2. Air cover; 201. Pile hole; 3. Pile driver; 301. Top head; 302. Pressure head; 303. Slide rail; 304. Impact head; 4. Water pump; 401. Down pipe; 5. Sealing ring; 6. Air pump; 601. Air supply pipe; 7. Jet pipe; 701. Horizontal section; 702. Vertical section; 8. Water level sensor; 9. Air nozzle; 10. Fiber branch; 11. Rotating pipe; 1101. Staggered hole; 12. Rack; 13. Input gear; 14. Gearbox; 15. Output gear; 16. Gear ring. DETAILED DESCRIPTION

[0021] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0022] The first implementation method:

[0023] Figure 1 and Figure 5-6 The invention shows a pile driving noise reduction device for a marine pile driving system, comprising a suspension rope 1, the bottom end of which is fixedly connected to an air cover 2, a pile driver 3 is installed on the inner wall of the top of the air cover 2, the pile driver 3 is composed of a top head 301 and a pressure head 302, two slide rails 303 are fixedly connected between the top head 301 and the pressure head 302, an impact head 304 is slidably connected between the two slide rails 303, when the pile driver 3 hammers the pile foundation, the impact head 304 moves up and down along the slide rails 303 to hammer the pile foundation, a pile entry hole 201 is opened at the bottom end of the air cover 2, and the inner wall of the pile entry hole 201 is fixedly connected to There is a sealing ring 5, and also includes a water pump 4 and an air pump 6. One end of the water pump 4 is fixedly connected to a downpipe 401, and one end of the downpipe 401 extends to the inner side of the bottom end of the air hood 2. One end of the air pump 6 is fixedly connected to an air supply pipe 601, and the bottom end of the air supply pipe 601 extends to the inner side of the top end of the air hood 2. The outer wall of the air hood 2 is fixedly connected to a plurality of evenly distributed jet pipes 7, and the inner wall of the bottom end of the air hood 2 is fixedly connected to a water level sensor 8. The water level sensor 8 is electrically connected to the water pump 4. The water pump 4 and the air pump 6 are both located on the water surface, and the air hood 2 is located underwater.

[0024] When in use, the air hood 2 is hoisted on the upper side of the pile foundation by the lifting rope 1, and the pile foundation is passed through the sealing ring 5 so that the top of the pile foundation is aligned with the bottom of the impact head 304, and the air hood 2 is located as a whole underwater, and the pile driver 3 is started to hammer the pile foundation to install it. When the noise is transmitted from the inside of the air hood 2 to the outside of the air hood 2, the noise is transmitted from the air to the water. The difference in acoustic impedance will cause a large number of sound waves to be reflected back into the air in the air hood 2, which weakens the propagation of noise and improves the noise reduction effect on the pile driver 3. Moreover, a small part of the noise that enters the water will cause a large number of sound waves to be reflected back into the water when it propagates toward the water, which greatly reduces the noise propagated on the water surface and greatly reduces the noise at the construction site. When it is necessary to reduce the noise propagated to the sea surface, the depth of the air hood 2 can be appropriately increased by the lifting rope 1 to extend the propagation distance of the noise, thereby improving the noise reduction effect.

[0025] At the same time, the air pump 6 is started to inject air into the interior of the air hood 2 through the air supply pipe 601, and the air is discharged outward through multiple jet pipes 7. At this time, the gas discharged through the jet pipes 7 forms a bubble curtain wall, which can absorb and scatter noise, reduce the distance that noise propagates in the water, and reduce the impact on the marine ecosystem.

[0026] Furthermore, the present invention is more advantageously applied to areas where marine life is not sensitive to noise and in application scenarios where it is urgently necessary to reduce the impact of noise on construction workers and surrounding residents.

[0027] When water penetrates into the interior of the air hood 2, the water level in the air hood 2 is detected by the water level sensor 8. When the water level in the air hood 2 is too high, the water pump 4 is started to discharge the water in the air hood 2 to the outside through the downpipe 401.

[0028] The second implementation method:

[0029] Figure 1-7 A piling noise reduction device for an ocean piling system is shown. Different from the first embodiment, the air jet pipe 7 consists of a horizontal section 701 and a vertical section 702. The inner wall of the horizontal section 701 is fixedly connected to an air nozzle 9. The inner wall of the vertical section 702 is fixedly connected to a plurality of evenly distributed fiber branches 10. The surface of the fiber branches 10 is provided with a hydrophobic layer.

[0030] When the pile driver 3 hammers the pile foundation, the hammering is intermittent, and the noise is intermittently generated, while the air bubbles are continuously discharged outwards through the air jet pipe 7, resulting in a waste of air bubbles.

[0031] Through the above arrangement, the gas in the air hood 2 is discharged through the air nozzle 9 to form bubbles, and when the bubbles pass through the vertical section 702, they adhere to the surface of the fiber branches 10, which can store the bubbles. When the pile driver 3 hammers the pile foundation, it generates vibrations, which drives the fiber branches 10 to shake, causing the bubbles to fall off the fiber branches 10 and float out, thereby increasing the number of bubbles in the bubble curtain wall, reducing the waste of bubbles, and improving the noise reduction effect of the bubble curtain wall.

[0032] The inner wall of the air hood 2 is rotatably connected with a rotating tube 11, and the outer wall of the rotating tube 11 is provided with a plurality of evenly distributed staggered holes 1101, and the plurality of staggered holes 1101 correspond one by one to the plurality of jet tubes 7. A rack 12 is slidably connected between the inner walls at both ends of the pile driver 3, and a gearbox 14 is fixedly connected to the inner wall of the pile driver 3 near the rack 12, and an input end of the gearbox 14 is fixedly connected with an input gear 13, and an output end of the gearbox 14 is fixedly connected with an output gear 15, and a gear ring 16 is fixedly connected to the inner wall of the rotating tube 11, and the gear ring 16 is meshed with the output gear 15, and the input gear 13 is meshed with the rack 12.

[0033] When the impact head 304 moves upward, the input gear 13 is driven to rotate forward through the rack 12. When the input gear 13 rotates forward, the gear ring 16 is driven to rotate forward through the output gear 15. At this time, the rotating tube 11 rotates clockwise, so that the staggered holes 1101 and the injection pipe 7 are staggered with each other. At this time, the gas in the pile driver 3 cannot be discharged and is compressed. Similarly, when the impact head 304 moves downward, the rotating tube 11 rotates counterclockwise, so that the staggered holes 1101 coincide with the injection pipe 7. At this time, the compressed gas in the pile driver 3 is discharged outward through the injection pipe 7. Through the above arrangement, the gas in the pile driver 3 can release bubbles outward according to the hammering action of the impact head 304, further improving the utilization effect of the bubble curtain wall.

[0034] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A pile driving noise reduction device for a marine pile driving system, comprising a suspension rope (1), the bottom end of the suspension rope (1) being fixedly connected to an air cover (2), and a pile driver (3) being installed on the inner wall of the top end of the air cover (2), characterized in that: The air hood (2) has a pile entry hole (201) at the bottom end, and a sealing ring (5) is fixedly connected to the inner wall of the pile entry hole (201). The air hood (2) also includes a water pump (4) and an air pump (6). One end of the water pump (4) is fixedly connected to a downpipe (401), and one end of the downpipe (401) extends to the inner side of the bottom end of the air hood (2). One end of the air pump (6) is fixedly connected to an air supply pipe (601), and the bottom end of the air supply pipe (601) extends to the inner side of the top end of the air hood (2). The outer wall of the air hood (2) is fixedly connected to a plurality of evenly distributed jet pipes (7). The inner wall of the bottom end of the air hood (2) is fixedly connected to a water level sensor (8), and the water level sensor (8) is electrically connected to the water pump (4). The water pump (4) and the air pump (6) are both located on the water surface, and the air hood (2) is located underwater. The air jet pipe (7) is composed of a horizontal section (701) and a vertical section (702); the inner wall of the horizontal section (701) is fixedly connected to an air jet head (9); the inner wall of the vertical section (702) is fixedly connected to a plurality of evenly distributed fiber branches (10); the surface of the fiber branches (10) is provided with a hydrophobic layer; the inner wall of the air cover (2) is rotatably connected to a rotating tube (11); the outer wall of the rotating tube (11) is provided with a plurality of evenly distributed staggered holes (1101); the plurality of staggered holes (1101) correspond one-to-one to the plurality of air jet pipes (7). A rack (12) is slidably connected between the inner walls at both ends of the pile driver (3); a gearbox (14) is fixedly connected to the inner wall of the pile driver (3) close to the rack (12); an input gear (13) is fixedly connected to the input end of the gearbox (14); an output gear (15) is fixedly connected to the output end of the gearbox (14); a gear ring (16) is fixedly connected to the inner wall of the rotating tube (11); the gear ring (16) is meshed with the output gear (15); and the input gear (13) is meshed with the rack (12).

2. The pile driving noise reduction device of the marine pile driving system according to claim 1, characterized in that: The pile driver (3) is composed of a top head (301) and a pressure head (302); two slide rails (303) are fixedly connected between the top head (301) and the pressure head (302); and an impact head (304) is slidably connected between the two slide rails (303).

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