River drainage regulation and storage system

Abstract

The invention belongs to the technical field of regulation and storage drainage, and discloses a regulation and storage system for drainage along a river, which comprises regulation and storage box culverts which are axially arranged along two banks of a river channel and buried under the river, and soil facing side walls of the regulation and storage box culverts and retaining walls are integrally manufactured; a plurality of inspection wells are evenly arranged on the top face of the regulation and storage box culvert at set intervals, and the drainage pipe channels are connected to the soil facing sides of the inspection wells. An inflow port with a set aperture is formed in a top plate of the regulation and storage box culvert, and the inspection well is communicated with the regulation and storage box culvert through the inflow port; a sewage flow groove is formed in a bottom plate of the regulation and storage box culvert, the sewage flow groove is located under the flow inlet, and the depth of the sewage flow groove is larger than that of the regulation and storage box culvert. The regulation and storage box culvert is located at the bottom of the river channel, the drainage pipe channel is connected to the top end of the inspection well, when the water level in the regulation and storage box culvert rises, the drainage pipe channel is prevented from being submerged due to high position, and the flow speed of sewage discharged to the inspection well can be stably maintained; sewage flows into the sewage launder from top to bottom, so that suspended matters are prevented from depositing in the regulation and storage box culvert, and the flow speed and regulation and storage capacity of the sewage are improved.

Description

Technical Field

[0001] This invention belongs to the field of water storage and drainage technology, and specifically relates to a riverside drainage and water storage system. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, urban drainage systems typically involve setting up interceptor pipes or sewage collection pipes along rivers. Interceptor pipes are constructed separately, occupying a large amount of underground space, making construction difficult, and having a small storage capacity. This results in problems such as urban waterlogging, direct sewage discharge, and sewage overflow, and also hinders the control of initial rainwater runoff pollution.

[0004] To address the aforementioned technical problems, existing technology discloses a levee that integrates interception, storage, and drainage functions, including a box culvert and stormwater / sewage inlet pipes. The upstream side of the box culvert is located near the river channel and has an overflow channel. The retaining side of the box culvert is located near the soil layer, and the outlet of the stormwater / sewage inlet pipe is located on the retaining side. This design allows sewage or rainwater to enter the box culvert through the stormwater / sewage inlet pipes and then be transported to the downstream intercepting sewer. When rainfall increases and the water level in the box culvert rises but does not reach the overflow level, the mixed stormwater and sewage will not overflow into the river and cause pollution. When the water level in the box culvert rises to the overflow level, the pollutants are diluted, and part of the mixed stormwater and sewage overflows into the river and is discharged as floodwater.

[0005] The above solution still has the following technical problems: When sewage flows through the box culvert of the above scheme, the sewage flow velocity is slow due to the flat bottom plate of the box culvert. Suspended solids in the sewage will be deposited on the bottom plate of the box culvert, which not only increases the water flow resistance and reduces the sewage transmission efficiency, but also significantly weakens the effective storage capacity of the box culvert. In addition, the above-mentioned scheme has rainwater and sewage inlet pipes located at the bottom of the retaining wall and the outlet directly connected to the box culvert. When the water level in the box culvert is above the rainwater and sewage inlet pipes, a back pressure effect will be formed, which will hinder the normal water inflow rate of the rainwater and sewage inlet pipes, thereby deteriorating the sewage flow state and overall regulation and storage performance. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a river drainage and storage system that can solve the technical problems of slow flow and easy sedimentation of sewage in box culverts in the prior art, which affect the storage capacity.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A river drainage and storage system is provided, including a storage box culvert arranged axially along both banks of the river and buried under the riverbed, wherein the soil-facing side wall of the storage box culvert and the retaining wall are integrally constructed. Several inspection wells are evenly arranged at set intervals on the top surface of the storage culvert, and drainage pipes are connected to the soil-facing side of the inspection wells; an inlet with a set diameter is opened on the top plate of the storage culvert, and the inspection wells are connected to the storage culvert through the inlet. A sewage flow channel is opened on the bottom plate of the storage culvert. The sewage flow channel is located directly below the inlet, and the depth of the sewage flow channel is greater than the depth of the storage culvert.

[0008] Preferably, a radial slope is made on the bottom surface of the regulating culvert, with the slope lower at one end near the sewage flow channel and higher at the other end.

[0009] Preferably, the bottom of the sewage flow channel is lower than the bottom of the storage culvert, the sewage flow channel is embedded downward into the soil layer, and the bottom of the storage culvert is reinforced with a foundation.

[0010] Preferably, the cross-section of the regulating culvert is rectangular.

[0011] Preferably, an overflow outlet is provided at the top of the inspection well on the side facing the river channel, with the bottom surface of the overflow outlet lower than the top surface of the drainage pipe and the top surface of the overflow outlet higher than the top surface of the drainage pipe.

[0012] Preferably, a grille is installed at the overflow outlet.

[0013] Preferably, the inlet uses a fixed-size orifice, wherein the upstream inlet has a larger size and the downstream inlet has a smaller size; The inlet orifice diameter is determined by the orifice outflow formula, which is as follows: ; In the formula: Q represents the flow rate (m). 3 / s); C d The orifice flow coefficient; A represents the effective inlet area (m²) 2 ); g is the acceleration due to gravity (9.81 m / s²). 2 ); h represents the effective head (m).

[0014] Preferably, the inspection well is equipped with a maintenance cover on the top and a ladder is installed on the inner wall of the inspection well.

[0015] Preferably, when the regulating culvert passes through a road or bridge, a double-layer culvert structure is adopted, and a river water culvert is integrally constructed on the top surface of the regulating culvert.

[0016] Preferably, the water-facing side of the inspection well is flush with the river retaining wall, the inspection well cover is flush with the walkways on both sides of the river, and a guardrail is installed on the top of the river retaining wall.

[0017] Compared with the prior art, the advantages and positive effects of this invention are: The regulating culvert of this invention is located at the bottom of the river channel. A drainage pipe is connected to the culvert via a manhole. The drainage pipe is connected to the top of the retaining wall where the manhole is located, placing the outlet of the drainage pipe at a relatively high position. When the water level in the regulating culvert rises, the outlet of the drainage pipe is prevented from being submerged due to its higher position, thus maintaining a stable inflow velocity for sewage or rainwater to the manhole. Directly below the inlet, a sewage flow channel is integrally cast on the bottom slab of the regulating culvert. When sewage or rainwater flows from the inlet into the regulating culvert from top to bottom, it rushes directly downwards into the sewage flow channel. Accelerated by gravity, the sewage flows even faster in the channel, preventing suspended solids from settling on the bottom slab of the regulating culvert and improving sewage flow velocity and regulating capacity. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1 This is a plan view of a riverside drainage and storage system according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a riverside drainage and storage system according to an embodiment of the present invention at the inspection well. Figure 3 This is a cross-sectional view of the regulating culvert of the present invention when it crosses a road; Figure 4 This is a cross-sectional view of the inspection well of this invention when it crosses a road; In the picture: 1. River channel; 2. Bridge; 3. Storage culvert; 4. Drainage pipe channel; 5. Inspection well; 6. Bar screen; 7. Overflow outlet; 8. Inlet; 9. Maintenance manhole cover; 10. Sewage channel; 11. River retaining wall; 12. Guardrail; 13. Walkway; 14. Riverbed; 15. River water culvert; 16. Ladder; 17. Road. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings.

[0022] This embodiment discloses a riverside drainage and storage system, such as Figure 1 , Figure 2As shown, the system includes a regulating culvert 3, which is arranged along the length (i.e., axial direction) of the river channel 1 on both banks of the channel 1, and is buried below the riverbed 14. The oncoming sidewall of the regulating culvert 3 is integrally constructed with a retaining wall, which extends upwards to the ground. It can be understood that, as... Figure 1 As shown, the riverbed 14 covers the top surface of the regulating culvert 3. The regulating culvert 3 serves as the toe of the retaining wall, which can enhance the stability of the retaining wall and prevent it from overturning. In addition, the integrated construction of the regulating culvert 3 and the river retaining wall can save the construction cost of the retaining wall and also save underground space.

[0023] like Figure 1 , Figure 2 As shown, a number of inspection wells 5 are evenly arranged at predetermined intervals on the top surface of the regulating culvert 3. The regulating culvert 3, the inspection wells 5, and the retaining wall are cast as a single unit. The inspection wells 5 are connected to the drainage pipe 4, as shown in the figure. Figure 1 , Figure 2 As shown, the drainage pipe 4 is connected to the soil-facing side of the inspection well 5, and the sewage or rainwater from the drainage pipe 4 can flow into the inspection well 5.

[0024] In this embodiment, as Figure 2 As shown, the inspection well 5 is connected to the storage culvert 3. Specifically, an inlet 8 with a set diameter is provided on the top plate of the storage culvert 3. The inspection well 5 and the storage culvert 3 are connected through the inlet 8. After entering the inspection well 5, the sewage or rainwater from the drainage pipe 4 flows downward into the storage culvert 3 under the action of gravity, and then is transmitted to the downstream intercepting sewer along the storage culvert 3.

[0025] It is understandable that within the inspection well 5, the drainage pipe 4 is connected to the storage culvert 3 via the inlet 8. The drainage pipe 4 is connected to the top of the retaining wall where the inspection well 5 is located, so that the outlet of the drainage pipe 4 is located at a relatively high position. When the water level in the storage culvert 3 rises, neither the inlet 8 nor the outlet of the drainage pipe 4 is easily submerged, which can maintain a stable inflow velocity of sewage or rainwater to the inspection well 5 and prevent the adverse effects of water level changes in the storage culvert 3 on the inflow stability of the drainage pipe 4.

[0026] In this embodiment, as Figure 2 As shown, a sewage flow channel 10 is integrally cast on the bottom plate of the regulating culvert 3 directly below the inlet 8. The sewage flow channel 10 refers to a groove opened in the bottom plate of the regulating culvert 3 to guide the flow of sewage. It can be achieved by slotting the bottom plate of the regulating culvert 3 or embedding a precast trough, for example, by using a trough-shaped template to form the flow channel during the casting process. Its main purpose is to ensure the sewage flow velocity and prevent the deposition of suspended solids in the sewage. The arrangement of the sewage flow channel 10 directly below the inlet 8 is used to enhance the guiding effect of the vertical flow of water.

[0027] It should be noted that the width of the sewage flow channel 10 is smaller than the width of the storage culvert 3, while the depth of the sewage flow channel 10 is greater than the depth of the storage culvert 3. When sewage or rainwater flows from the inlet 8 downwards into the storage culvert 3, it will flow directly downwards into the sewage flow channel 10. Since fluids move faster in channels with smaller cross-sectional areas and slower in channels with larger cross-sectional areas, the flow velocity of sewage or rainwater in the sewage flow channel 10 is faster than that in the storage culvert 3 due to the smaller cross-sectional area. Furthermore, since the sewage flows from top to bottom into the sewage flow channel 10, the increased flow velocity due to gravity reduces the residence time of suspended solids, preventing them from depositing on the bottom plate of the storage culvert 3 and affecting the sewage flow velocity and storage capacity. This effectively solves the problem in existing technologies where slow sewage flow leads to suspended solids deposition, affecting storage capacity.

[0028] Understandably, the sewage trough 10 is mainly used for sewage transport on sunny days. When the rainfall increases, the flow rate of the mixed sewage and rainwater increases, and the water level of the sewage trough 10 gradually rises until the water level of the regulating culvert 3 also gradually rises.

[0029] It should be noted that this embodiment increases the water flow velocity by using a sewage flow channel to prevent suspended solids from accumulating on the bottom plate. This effectively solves the problem of suspended solids deposition caused by the slow flow velocity of sewage in the culvert. At the same time, the high-level setting of the drainage pipe 4 and the inlet avoids the negative impact of the rising water level in the culvert on the flow velocity of the drainage pipe 4, ensuring the stable transport capacity of the drainage pipe 4, thereby guaranteeing the long-term effective operation and storage efficiency of the system.

[0030] like Figure 2 As shown, inside the regulating culvert 3, the bottom surface of the regulating culvert 3 is sloped radially along the river channel 1. In this embodiment, the slope is lower at one end near the sewage flow channel 10 and higher at the other end, with a slope of 3%. The bottom surface of the regulating culvert 3 is sloped radially along the river channel, and inclined formwork is used during the concrete pouring process. This is mainly to allow water to flow to a lower location and enter the sewage flow channel 10, reducing the risk of suspended solids deposition.

[0031] like Figure 2 As shown, to enhance the stability of the retaining wall and the regulating culvert 3, a foundation is poured at the bottom of the regulating culvert 3 to ensure its stability and flatness, thus providing stable support for the retaining wall; as shown. Figure 2As shown, the bottom of the sewage flow channel 10 is lower than the bottom of the regulating culvert 3, making the foundation base of the sewage flow channel 10 lower than that of the regulating culvert 3. This creates a downward embedding effect of the sewage flow channel 10 into the foundation. With the support of the foundation, the sewage flow channel 10 and the regulating culvert 3 can better resist the lateral earth pressure transmitted from the retaining wall. This not only strengthens the supporting effect of the regulating culvert 3 on the retaining wall but also ensures the stability of the regulating culvert 3. Understandably, insufficient stability of the storage culvert 3 will affect the stability of the retaining wall and thus the long-term operational reliability of the drainage system. In this embodiment, the sewage flow channel 10 is embedded downward into the foundation, which can enhance the stability of the storage culvert 3, ensure the continuity of the internal flow channel and hydraulic slope of the storage culvert 3, and at the same time disperse the lateral earth pressure borne by the retaining wall, ensuring that the retaining wall and the storage culvert 3 work together as a whole and achieve safe and stable operation of the drainage storage system.

[0032] In this embodiment, as Figure 2 As shown, the regulating culvert 3 has a rectangular cross-section with parallel top and bottom slabs and vertical sidewalls. It can be constructed using cast-in-place or precast concrete components. Its purpose is to provide a regular water flow channel, reducing velocity differences and eddies caused by irregular cross-sections, thereby effectively preventing suspended solids from settling at the bottom. Furthermore, it allows sewage or rainwater to rise steadily upon entering the regulating culvert 3, avoiding large fluctuations in water level. It can be understood that the linear space formed by the rectangular cross-section of the regulating culvert 3 extends continuously along the axial direction of the river channel 1, ensuring a uniform distribution and efficient utilization of the regulating capacity, thus providing a stable and reliable primary storage space for rainwater or sewage.

[0033] like Figure 1 , Figure 2 As shown, an overflow outlet 7 is installed on the top of the side of the inspection well 5 facing the river channel 1. The bottom surface of the overflow outlet 7 is lower than the top surface of the drainage pipe 4, and the top surface of the overflow outlet 7 is higher than the top surface of the drainage pipe 4. When the rainfall gradually increases, and the water level in the storage culvert 3 gradually and continuously rises until the water level reaches the position of the drainage pipe 4 and the overflow outlet 7, the overflow is triggered. Rainwater or sewage flows out from the drainage pipe 4 and is discharged into the river channel 1 through the overflow outlet 7, relieving the storage pressure of the storage culvert 3.

[0034] It is understandable that the overflow port 7 refers to the opening set on the side wall of the inspection well 5 for discharging excess water. It can be implemented by using a rectangular, circular or trapezoidal orifice, etc., with the purpose of providing a controllable overflow channel.

[0035] It should be noted that the bottom surface of the overflow outlet 7 is lower than the top surface of the drainage pipe 4. Under normal water levels, sewage can flow smoothly to the storage culvert 3 by gravity. Overflow only begins when the water level in the inspection well rises to the overflow outlet 7. This is to prevent ineffective overflow at low water levels and ensure the continuity of sewage collection. When the water level in the storage culvert 3 is full and can no longer be stored, continuing to drain water into the inspection well 5 will only increase the pressure in the storage culvert 3 and affect the flow rate of the drainage pipe 4. The overflow outlet 7 can directly discharge the water that has exceeded the storage system, maintain the operation of the storage system, and ensure the normal drainage of the drainage pipe 4, reducing the water flow resistance and the probability of blockage in the storage system.

[0036] In this embodiment, the overflow outlet 7 on the top side of the inspection well 5 facing the river 1 is in the form of a rectangular orifice. Its bottom edge is lower than the top edge of the drainage pipe, and its top edge is higher than the top edge of the drainage pipe. This allows the overflow to begin when the water level in the storage culvert 3 rises until the water level in the inspection well 5 rises to the overflow outlet 7, and the water flows smoothly out towards the river 1.

[0037] In this embodiment, as Figure 1 , Figure 2 As shown, a screen 6 is also installed at the overflow outlet 7. When the mixed rainwater and sewage flows through the overflow outlet 7, it can intercept larger floating objects and garbage carried by the water flow, preventing these pollutants from being discharged into the river channel 1 with the mixed sewage. It can be understood that by using the overflow outlet 7 as a key location for the discharge channel of mixed sewage, when the regulating culvert 3 is full and the water level rises, the screen 6 can effectively block pollutants from entering the river channel 1, while ensuring that the normal sewage discharge function is not affected.

[0038] The size of the inlet 8 affects the inflow velocity and flow rate of sewage / rainwater / mixed sewage into the storage culvert 3. To ensure a stable flow velocity of rainwater or sewage entering the storage culvert 3 through the inlet 8 from the drainage pipe 4, and to prevent water level fluctuations from interfering with sewage transport efficiency, in this embodiment, the inlet 8 uses a fixed-size orifice, with the upstream inlet 8 being larger and the downstream inlet 8 being smaller. This is because during rainfall, if the size of the downstream inlet 8 is larger than that of the upstream inlet 8, the water level in the downstream storage culvert 3 may rise faster, thus affecting the sewage flow velocity upstream.

[0039] The size of the inlet orifice 8 is determined by the orifice outflow formula, which is as follows: ; In the formula: Q represents the flow rate (m). 3 / s); C d This is the orifice flow coefficient, typically ranging from 0.6 to 0.7. A represents the effective inlet area (m²) 2 ); g is the acceleration due to gravity (9.81 m / s²). 2 ); h is the effective head, which in this embodiment is the height (m) from the inlet 8 to the drainage pipe 4. Under different rainfall intensities, the mixed sewage discharged from all drainage pipes 4 enters the inspection well 5 and then flows through the inlet 8, and can flow into the storage culvert 3 at a stable flow rate.

[0040] like Figure 4 As shown, in this embodiment, the top of the inspection well 5 is provided with an inspection well cover 9. The inspection well cover 9 refers to the protective structure covering the top of the inspection well 5. It can be a circular cover plate made of cast iron or composite material. Its purpose is to prevent personnel from accidentally falling and external debris from entering the well. A ladder 16 is installed on the inner wall of the inspection well 5 for maintenance personnel to enter. The ladder refers to the climbing facility installed on the inner wall of the inspection well 5. It can be a fixed ladder made of metal or an embedded step structure. Its purpose is to provide a safe and stable passage for maintenance personnel to go up and down, so as to facilitate maintenance personnel to maintain, repair, and clean the regulating culvert 3, inspection well 5, grating 6, and sewage flow channel 10. In this embodiment, as Figure 1 , Figure 3 , Figure 4 As shown, when the regulating box culvert 3 crosses road 17 or bridge 2, the single-layer structure cannot effectively bear the traffic load from above, which can easily lead to deformation, cracking, or affect the stability of the road or bridge, thereby causing system failure and safety hazards. In this embodiment, when the regulating box culvert 3 crosses road 17 or bridge 2, a double-layer box culvert structure is adopted, such as... Figure 3 , Figure 4 As shown, a river culvert 15 is integrally constructed on the top surface of the regulating culvert 3. In this embodiment, the river culvert 15 can disperse and bear concentrated traffic loads from roads or bridges, avoiding deformation of the single-layer structure due to local stress concentration. The integral construction can be understood as the regulating culvert 3 and the river culvert 15 forming a seamless integral structure through continuous casting process. Its purpose is to eliminate structural weaknesses that may occur from separate construction, ensuring stiffness transfer and sealing performance between upper and lower layers. The river culvert isolates the external loads from interfering with the regulating culvert 3, so that the internal hydraulic conditions of the regulating culvert 3 are not affected by the loads of the road 17 or bridge 2.

[0041] like Figure 2As shown, the water-facing side of the inspection well 5 is flush with the river retaining wall 11, and the maintenance cover 9 of the inspection well 5 is flush with the walkways 13 on both sides of the river 1; a guardrail 12 is installed on the top of the river retaining wall 11 for protection. In this embodiment, the river retaining wall 11 is faced with mortar-grouted stone to enhance the resistance of the surface of the river retaining wall 11 to the impact of water flow.

[0042] Through the above solution, this embodiment effectively prevents the deposition of suspended solids during the transportation of sewage, avoids secondary pollution caused by mixed sewage carrying pollutants into the river, and ensures the long-term stable operation of the system, thereby improving the overall efficiency of the riverside drainage and storage system in terms of rainwater and sewage storage, pollution control and maintenance management.

[0043] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A riverside drainage and storage system, characterized in that, This includes regulating culverts that are axially arranged along both banks of the river and buried under the riverbed, with the soil-facing sidewalls of the regulating culverts and the retaining walls being constructed as a single unit. Several inspection wells are evenly arranged at set intervals on the top surface of the storage culvert, and drainage pipes are connected to the soil-facing side of the inspection wells; an inlet with a set diameter is opened on the top plate of the storage culvert, and the inspection wells are connected to the storage culvert through the inlet. A sewage flow channel is opened on the bottom plate of the storage culvert. The sewage flow channel is located directly below the inlet, and the depth of the sewage flow channel is greater than the depth of the storage culvert.

2. The riverside drainage and storage system as described in claim 1, characterized in that, A radial slope is made on the bottom surface of the regulating culvert, with the slope lower at one end and higher at the other end near the sewage flow channel.

3. A riverside drainage and storage system as described in claim 1, characterized in that, The bottom of the sewage flow channel is lower than the bottom of the storage culvert. The sewage flow channel is embedded into the soil layer, and the bottom of the storage culvert is reinforced with a foundation.

4. A riverside drainage and storage system as described in claim 1, characterized in that, The cross-section of the regulating culvert is rectangular.

5. A riverside drainage and storage system as described in claim 1, characterized in that, An overflow outlet is installed at the top of the inspection well on the side facing the river channel. The bottom surface of the overflow outlet is lower than the top surface of the drainage pipe, and the top surface of the overflow outlet is higher than the top surface of the drainage pipe.

6. A riverside drainage and storage system as described in claim 1, characterized in that, A grille is installed at the overflow outlet.

7. A riverside drainage and storage system as described in claim 1, characterized in that, The inlet uses a fixed-size orifice, with the upstream inlet having a larger size and the downstream inlet having a smaller size; The inlet orifice diameter is determined by the orifice outflow formula, which is as follows: In the formula: ; In the formula: Q represents the flow rate (m). 3 / s); C d The orifice flow coefficient; A represents the effective inlet area (m²) 2 ); g is the acceleration due to gravity (9.81 m / s²). 2 ); h represents the effective head.

8. A riverside drainage and storage system as described in claim 1, characterized in that, The inspection well is equipped with a maintenance cover on top and a ladder is installed on the inner wall of the inspection well.

9. A riverside drainage and storage system as described in claim 1, characterized in that, When a regulating culvert passes through a road or bridge, it adopts a double-layer culvert structure, with a river water culvert integrally constructed on the top surface of the regulating culvert.

10. A riverside drainage and storage system as described in claim 1, characterized in that, The water-facing side of the inspection well is flush with the river retaining wall, the inspection well cover is flush with the walkways on both sides of the river, and a guardrail is installed on the top of the river retaining wall.

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