A multi-stage noise-reducing siltation drop well

Abstract

This utility model relates to a multi-stage noise-reducing and silt-accumulating drop well, including a water-retaining wall, an inlet pipe, and an outlet pipe. The inlet and outlet pipes are connected to the water-retaining wall, and the outlet pipe is located near the downstream main pipe. The water-retaining wall is equipped with a first-stage silt-accumulating groove, a second-stage silt-accumulating groove, and a third-stage silt-accumulating groove. Each of the first-stage, second-stage, and third-stage silt-accumulating grooves is equipped with a water flow deceleration block, and a silt-accumulating baffle is installed behind the water flow deceleration block. The water-retaining wall forms an angle of 30°–45° with the downstream main pipe. This utility model, by setting multiple silt-accumulating grooves within the water-retaining wall, effectively reduces the direct contact and scouring of the water flow from the inlet pipe with the downstream main pipe; it also reduces wear and tear on the construction equipment and noise generation, and extends the service life of the drop well.

Description

Technical Field

[0001] This utility model relates to the field of drop well technology, specifically a multi-stage noise reduction and siltation drop well. Background Technology

[0002] Urban drainage drop manholes play an irreplaceable role in modern urban drainage systems. As a key component of hydraulic engineering, their primary responsibility is to address the challenges posed by differences in water flow height due to undulating terrain, ensuring smooth and unobstructed water flow. These facilities are typically cleverly placed at key nodes in rivers, ditches, and sewers. When water flows from higher to lower elevations, the drop manhole acts as a crucial landing platform, effectively regulating the water head (i.e., the difference in water level) and preventing excessive erosion of the surrounding soil, thus maintaining terrain stability. Furthermore, drop manholes possess excellent buffering capabilities, mitigating the impact of water flow to a certain extent and providing a robust protective barrier for downstream structures, ensuring they are protected from potential damage from water flow impacts. Despite their crucial role in urban drainage systems, with the passage of time and increased usage frequency, some shortcomings of existing drop manholes have gradually become apparent:

[0003] 1. Siltation problem: Due to their unique structural design, drop wells gradually become natural accumulation sites for solid waste and sediment. Over time, the continuous accumulation of these impurities at the bottom of the well not only severely hinders the smooth flow of water but also significantly weakens the drainage efficiency of the drop well, resulting in a significant reduction in its working efficiency. Therefore, in order to maintain the continuous and efficient operation of drop wells, regular cleaning and maintenance are particularly important.

[0004] 2. The noise generated by water cascading from a height, especially during relatively quiet times such as night or early morning, can significantly impact the quality of life of nearby residents. With the acceleration of urbanization, more and more cascading drainage systems are being built in densely populated areas. How to effectively mitigate noise pollution from these systems has become a major challenge for urban planning and construction. If not handled properly, noise pollution can not only affect residents' quality of life but also negatively impact the overall image and attractiveness of the city.

[0005] 3. Complexity of Construction and Cost Considerations: The intricate design of drop manholes encompasses a series of key elements, including drop walls and energy dissipation pools. This inherent complexity undoubtedly sets stringent standards for construction and subsequent maintenance. The precise design and construction of these structural elements aim to minimize the direct impact of water flow on the manhole structure, thereby ensuring its safety, stability, and long-term durability. However, this complexity and precision also lead to a significant increase in construction costs and maintenance complexity, posing a serious challenge to the financial sustainability of urban infrastructure construction. These issues not only challenge the normal operating efficiency of drop manholes but may also have potential impacts on the surrounding environment and the quality of life of residents. Utility Model Content

[0006] The purpose of this invention is to provide a multi-stage noise reduction and siltation-accumulation drop well, which aims to solve the shortcomings of the existing technology and optimize the performance of the drop well.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A multi-stage noise-reducing and silt-accumulating drop well includes a water-retaining wall, an inlet pipe, and an outlet pipe. The inlet pipe and outlet pipe are connected to the water-retaining wall, and the outlet pipe is located near the downstream main pipe. The water-retaining wall is provided with a first-stage silt-accumulating trough, a second-stage silt-accumulating trough, and a third-stage silt-accumulating trough. Each of the first-stage, second-stage, and third-stage silt-accumulating troughs is provided with a water flow deceleration block. A silt-accumulating baffle is provided behind each water flow deceleration block. The water-retaining wall forms an angle of 30°-45° with the downstream main pipe.

[0009] Preferably, the capacity of the Level I sedimentation tank is greater than that of the Level II sedimentation tank, the capacity of the Level II sedimentation tank is greater than that of the Level III sedimentation tank, and a fixed sedimentation baffle is provided at the downstream end of the Level I sedimentation tank.

[0010] Preferably, the siltation baffle in the Level II siltation trough is a rotatable baffle.

[0011] Preferably, the first-stage sedimentation tank is provided with two water flow deceleration blocks of different sizes, wherein the smaller water flow deceleration block is located above the first-stage sedimentation tank, and the larger water flow deceleration block is located inside the first-stage sedimentation tank.

[0012] Preferably, the Class III sedimentation tank is located at the bottom of the entire water-retaining wall and is directly connected to the water outlet.

[0013] Preferably, the adjustable range of the rotatable baffle is 60°-90°.

[0014] Preferably, the water flow deceleration block is connected to the water-blocking wall, and the water flow deceleration block is constructed with an upwardly extending spike.

[0015] Preferably, the water-retaining wall, the Class I siltation trough, the Class II siltation trough, and the Class III siltation trough are integrally cast from concrete.

[0016] Preferably, the water-retaining wall and the downstream main pipe are fixedly connected.

[0017] Preferably, the fixed silt accumulation baffle is made of wear-resistant concrete.

[0018] Compared with the prior art, the technical solution of this application has the following technical effects:

[0019] 1. This utility model can effectively reduce the direct contact and scouring between the water flowing out of the inlet pipe and the downstream main pipe by setting up multi-stage sedimentation troughs in the water-retaining wall; reduce the wear and tear of the construction facilities and equipment and the generation of noise, and extend the service life of the drop well.

[0020] 2. This utility model, by setting a small water flow deceleration block at the front end of the first-stage sedimentation tank, reduces the flow velocity of the water flowing out of the inlet after contact with the small water flow deceleration block, thereby changing the flow direction of part of the water flow. This deceleration block then contacts and merges with the remaining water flow whose direction has not been changed, canceling out some of the converted kinetic energy. This achieves the purpose of reducing the overall water flow velocity, allowing the overall water flow to enter the first-stage sedimentation tank at a lower velocity. Simultaneously, a large water flow deceleration block is installed inside the first-stage sedimentation tank. Contact with this block effectively changes the movement direction of most of the water flow, and this deceleration block contacts and merges with the remaining water flow whose direction has not been changed, canceling out the kinetic energy converted from gravitational potential energy and the remaining kinetic energy of the water itself. Due to the reduced water flow velocity, the silt or other large particles carried in the water flow have sufficient settling time to settle effectively within the first-stage sedimentation tank. By installing a water flow deceleration block in the secondary sedimentation tank, the high-kinetic-energy water overflowing from the primary sedimentation tank can be redirected to reduce its kinetic energy. Simultaneously, a rotatable sedimentation baffle is installed at the rear end of the secondary sedimentation tank, which can be adjusted according to the flow rate of the water from the inlet pipe. By installing a fixed sedimentation baffle at the rear end of the tertiary sedimentation tank, it is effectively prevented that a small portion of the water flowing out of the inlet pipe will directly bypass the primary and secondary sedimentation tanks and enter the tertiary sedimentation tank, directly contacting and scouring the drop well, thus effectively extending the service life of the drop well.

[0021] 3. By using multi-stage sedimentation tanks and deceleration modules, the direct scouring of the drop well by the flowing water can be mitigated. When designing, only the material and installation position of the water flow deceleration blocks and the number of sedimentation tanks need to be considered. Attached Figure Description

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model.

[0024] In the diagram: 1. Water-retaining wall; 2. Water inlet; 3. Water outlet; 4. Downstream main pipe; 5. Level I sedimentation trough; 6. Level II sedimentation trough; 7. Level III sedimentation trough; 8. Water flow deceleration block; 9. Fixed sedimentation baffle; 10. Sedimentation baffle. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0026] As a preferred embodiment of this utility model, see attached... Figure 1 As shown, this embodiment provides a multi-stage noise reduction and siltation drop well, including a water-retaining wall 1, an inlet pipe 2, and an outlet pipe 3. The inlet pipe 2 and the outlet pipe 3 are connected to the water-retaining wall 1, and the outlet pipe 2 is close to the downstream main pipe 4. The water-retaining wall 1 is provided with a first-stage siltation trough 5, a second-stage siltation trough 6, and a third-stage siltation trough 7. Each of the first-stage siltation trough 5, the second-stage siltation trough 6, and the third-stage siltation trough 7 is provided with a water flow deceleration block 8. A siltation baffle 10 is provided after the water flow deceleration block. The water-retaining wall 1 and the downstream main pipe 4 form an angle of 30°-45°.

[0027] In the above embodiments, the capacity of the first-level sedimentation tank 5 is greater than that of the second-level sedimentation tank 6, the capacity of the second-level sedimentation tank 6 is greater than that of the third-level sedimentation tank 7, and a fixed sedimentation baffle 9 is provided at the downstream end of the first-level sedimentation tank 5.

[0028] The above embodiments clarify the basic composition and layout of the multi-stage noise reduction and siltation drop well, the connection between the inlet and outlet pipes and the water-retaining wall, the setting of multi-stage siltation troughs, water flow deceleration blocks, and siltation baffles, as well as the angle between the water-retaining wall and the downstream main pipe. This lays the foundation for the entire drop well to achieve noise reduction and siltation functions, allowing water to enter the siltation troughs in an orderly manner and receive preliminary treatment. The first-stage siltation trough 5 has the largest capacity and a fixed siltation baffle is set at its downstream end, which can intercept a large amount of silt first and give full play to the primary sedimentation effect. The capacities of the second-stage siltation trough 6 and the third-stage siltation trough 7 decrease sequentially, which can form graded sedimentation, improve the silt interception efficiency, and reduce the amount of silt entering the downstream main pipe.

[0029] In some preferred embodiments, the silt-accumulating baffle in the secondary silt-accumulating trough 6 is a rotatable baffle. Rotation is achieved by hinged the baffle within the secondary silt-accumulating trough 6, with a compression spring connecting the baffle and the trough 6. Under normal drainage conditions, the amount of silt carried by the water flow is relatively small, and the rotatable baffle remains closed, allowing the water to settle sufficiently within the secondary silt-accumulating trough 6, effectively intercepting the silt. When encountering extreme weather such as heavy rain, when the water flow carries a large amount of silt, the increased water flow impact force pushes the baffle to rotate around its axis. At this time, the baffle tilts, reducing its interception height and creating a "green channel" for the silt, allowing it to smoothly enter the tertiary silt-accumulating trough 7. This prevents the secondary silt-accumulating trough 6 from becoming clogged due to excessive silt accumulation, ensuring the smooth flow of the drainage system.

[0030] In some preferred embodiments, two water flow deceleration blocks 8 of different sizes are provided in the first-stage sedimentation tank 5, wherein the smaller water flow deceleration block is located above the first-stage sedimentation tank 5, and the larger water flow deceleration block is located inside the first-stage sedimentation tank.

[0031] In the above embodiment, the smaller deceleration module located at the top first decelerates the water flow, while the larger deceleration module located at the bottom further reduces the flow velocity, making it easier for silt to settle. This enhances the sedimentation capacity of the primary sedimentation tank and reduces the impact of the water flow on subsequent structures.

[0032] In some preferred embodiments, the third-stage sedimentation tank 7 is located at the bottom of the entire water-retaining wall 1 and is directly connected to the outlet pipe 3. This allows for a final sedimentation of the water flow after the first two stages of sedimentation, ensuring that the discharged water has a low mud content, and its location facilitates the natural accumulation of silt, making subsequent cleaning easier.

[0033] In some preferred embodiments, the adjustable range of the rotatable baffle is 60°-90°. This adjustment range provides ample space for water flow and silt. Under heavy drainage conditions such as rainstorms, the large opening angle of the baffle allows for the rapid release of large amounts of water and silt, preventing drainage bottlenecks caused by an insufficient opening. Compared to a smaller opening angle, this range significantly increases the water flow rate per unit time, effectively relieving drainage pressure, preventing waterlogging, and ensuring the efficient operation of the drainage system.

[0034] In some preferred embodiments, in order to obtain a better blocking effect and effectively reduce the kinetic energy of the water flow, the water flow deceleration block 8 in this embodiment is connected to the water-blocking wall 1, and the water flow deceleration block 8 is constructed with an upwardly extending spike.

[0035] In some preferred embodiments, to ensure structural strength and stability, the water-retaining wall 1, the Class I siltation trough 5, the Class II siltation trough 6 and the Class III siltation trough 7 described in this embodiment are integrally cast from concrete.

[0036] In some embodiments, the water-retaining wall and the downstream main pipe are fixedly connected to improve the structural stability of the water-retaining wall, prevent noise pollution such as vibration and shaking caused by long-term water flow scouring, and ensure structural strength. In order to improve the service life of the fixed siltation baffle, the fixed siltation baffle is made of wear-resistant concrete.

[0037] The working principle of this utility model is as follows:

[0038] When the water flow from inlet 2 is small (dry season) or moderate (excluding drought and flood seasons, this is the water flow from the branch pipe inlet most of the time), the water flows from inlet 2 into the primary sedimentation tank 5. Because two flow deceleration blocks (one small and one large) are installed in the primary sedimentation tank 5, the kinetic energy of the water flowing into it is further weakened. The silt or other larger particles carried in the water will naturally settle in the primary sedimentation tank 5 due to gravity. When the primary sedimentation tank 5 is full, the amount of silt or other larger particles in the overflowing water will be less than that in the water just flowing out of the inlet. The water overflowing from the primary sedimentation tank 5 flows into the secondary sedimentation tank 6. Because the secondary sedimentation tank 6 is equipped with flow deceleration blocks, the large flow of the water... Some kinetic energy is consumed, so the sludge or other particulate impurities in the water flow naturally settle in the secondary sedimentation tank due to gravity. When the secondary sedimentation tank 6 is full, the content of sludge or other particulate matter in the overflowing water will be less than that in the water that just overflowed from the primary sedimentation tank. The water overflowing from the secondary sedimentation tank 6 flows into the tertiary sedimentation tank 7. Because the tertiary sedimentation tank 7 is equipped with a water flow deceleration block, most of the kinetic energy of the water flow is consumed. Therefore, the sludge or other particulate impurities in the water flow naturally settle in the tertiary sedimentation tank 7 due to gravity. When the tertiary sedimentation tank 7 is full, the content of sludge or other particulate matter in the overflowing water will be less than that in the water that just overflowed from the secondary sedimentation tank. The overflowing water flows out from the outlet pipe 3 and merges into the upstream main pipe to flow into the downstream main pipe 4.

[0039] When the flow rate from inlet 2 is high (during flood season), the baffle in the secondary sedimentation tank is rotated 30° clockwise. The water flowing from inlet 2 has high kinetic energy, resulting in a high initial velocity. Most of the water flows in a parabolic motion after entering the primary sedimentation tank 5 through the baffle wall. However, the water near the bottom of the inlet changes direction due to the small flow deceleration blocks in the primary sedimentation tank, generating a reverse velocity. This reduces the flow velocity of most of the water flowing from the inlet, prematurely reducing its kinetic energy. After flowing into the first-stage sedimentation tank 5, the water flow changes direction due to the large flow deceleration block installed in the first-stage sedimentation tank, thus generating a reverse velocity. This reverse-velocity water encounters the majority of the water flow that has entered the first-stage sedimentation tank from the inlet pipe and is undergoing parabolic motion. Because the directions of motion are opposite, this significantly dissipates the kinetic energy of most of the water flow, allowing most of it to flow smoothly into the first-stage sedimentation tank 5. However, some water flow, due to the insufficient dissipation of its kinetic energy and gravitational potential energy by the reverse-velocity flow, falls into the sedimentation tank 5. On the baffle, its kinetic energy is consumed; when the first-stage sedimentation tank is filled with water, it overflows into the second-stage sedimentation tank, where its kinetic energy is reduced by the deceleration module. Finally, it overflows from the second-stage sedimentation tank into the third-stage sedimentation tank, where its kinetic energy is reduced by the deceleration module. Finally, it overflows from the third-stage sedimentation tank and flows into the downstream main pipe from the outlet. The remaining water, due to its greater kinetic energy, will splash directly onto the rotatable baffle on the second-stage sedimentation tank, mixing with the water overflowing from the first-stage sedimentation tank into the second-stage sedimentation tank via the deceleration module, accumulating in the second-stage sedimentation tank. When the second-stage sedimentation tank is full, one... The water overflows from the second-level sedimentation tank and enters the third-level sedimentation tank. After its kinetic energy is reduced by the deceleration module in the third-level sedimentation tank, it accumulates in the third-level sedimentation tank. When the third-level sedimentation tank is full, the water overflows from the third-level sedimentation tank and flows into the downstream main pipe from the outlet. A small portion of the water, due to its higher initial kinetic energy, flows out from the inlet and splashes directly onto the sedimentation baffle of the third-level sedimentation tank. It mixes with the water that overflows from the second-level sedimentation tank and enters the third-level sedimentation tank, where its kinetic energy is reduced by the water flow deceleration block. The mixture accumulates in the third-level sedimentation tank 7. When the third-level sedimentation tank 7 is full, the water overflows from the third-level sedimentation tank 7 and flows into the downstream main pipe 4 from the outlet 3.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multi-stage noise-reducing and silt-accumulating drop well, characterized in that: It includes a water-retaining wall, an inlet pipe, and an outlet pipe. The inlet pipe and the outlet pipe are connected to the water-retaining wall, and the outlet pipe is close to the downstream main pipe. The water-retaining wall is provided with a first-level sedimentation trough, a second-level sedimentation trough, and a third-level sedimentation trough. Each of the first-level sedimentation trough, the second-level sedimentation trough, and the third-level sedimentation trough is provided with a water flow deceleration block. A sedimentation baffle is provided after the water flow deceleration block. The water-retaining wall forms an angle of 30°-45° with the downstream main pipe.

2. The multi-stage noise reduction and siltation-reducing drop well according to claim 1, characterized in that: The capacity of the Level I sedimentation tank is greater than that of the Level II sedimentation tank, the capacity of the Level II sedimentation tank is greater than that of the Level III sedimentation tank, and a fixed sedimentation baffle is provided at the downstream end of the Level I sedimentation tank.

3. The multi-stage noise reduction and siltation-reducing drop well according to claim 1, characterized in that, The siltation baffle in the Level II siltation trough is a rotatable baffle.

4. The multi-stage noise-reducing and silt-accumulating drop well according to claim 1, characterized in that, The first-stage sedimentation trough is equipped with two water flow deceleration blocks of different sizes, with the smaller water flow deceleration block located above the first-stage sedimentation trough and the larger water flow deceleration block located inside the first-stage sedimentation trough.

5. The multi-stage noise-reducing and silt-accumulating drop well according to claim 1, characterized in that, The Class III sedimentation trough is located at the bottom of the entire water-retaining wall and is directly connected to the water outlet.

6. The multi-stage noise-reducing and silt-accumulating drop well according to claim 3, characterized in that, The adjustable range of the rotatable baffle is 60°-90°.

7. The multi-stage noise-reducing and silt-accumulating drop well according to claim 4, characterized in that, The water flow deceleration block is connected to the water-blocking wall, and the water flow deceleration block is constructed with an upwardly extending spike.

8. The multi-stage noise-reducing and silt-accumulating drop well according to claim 1, characterized in that, The water-retaining wall, the Class I siltation channel, the Class II siltation channel, and the Class III siltation channel are all integrally cast from concrete.

9. The multi-stage noise-reducing and silt-accumulating drop well according to claim 1, characterized in that, The water-retaining wall and the downstream main pipe are fixedly connected.

10. The multi-stage noise-reducing and silt-accumulating drop well according to claim 2, characterized in that, The fixed silt accumulation baffle is made of wear-resistant concrete.

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