Method for improving the anti-silt capacity of a municipal sewer network system

Abstract

The application discloses a method for improving the anti-silt capacity of a city drainage pipe network system lifting pump station, which comprises the following steps: setting a combined stand at the end of a double-bin arc-shaped water inlet box culvert of the lifting pump station to improve the uniformity of the flow distribution and the flow velocity distribution of the double-bin arc-shaped water inlet box culvert; and setting a'san' type cross beam at the diffusion section of a water collecting pool of the lifting pump station to make the main flow of the water collecting pool of the lifting pump station dive and the flow velocity distribution be further homogenized. The application can effectively improve the flow state of the water in the arc-shaped water inlet box culvert and the water collecting pool of the city drainage pipe network system lifting pump station, effectively prevent the siltation problem caused by the deposition of rainwater and sewage solid particles, and has important engineering application value for improving the anti-silt capacity of the city drainage pipe network system lifting pump station and ensuring the safe, stable and efficient operation of the lifting pump station. The application has a simple structure, is easy to construct and manufacture, can effectively save the dredging cost, and is suitable for popularization and use in the design and reconstruction engineering of the city drainage pipe network system lifting pump station.

Description

Technical Field

[0001] The present invention relates to the technical field of urban drainage pipe network system lifting pump station engineering, in particular to a method for improving the anti-silting capability of an urban drainage pipe network system lifting pump station. Background Art

[0002] As my country's urbanization process accelerates, the proportion of impervious surface area in cities increases. Due to the massive increase in urban domestic sewage and industrial wastewater, as well as the frequent occurrence of extreme rainstorms, the urban surface runoff has increased significantly. If it is not removed in time, it will not only bring inconvenience to urban residents' lives and industrial production, but also easily cause floods and disasters, resulting in huge economic losses.

[0003] Drainage networks are engineering facilities that treat and remove domestic sewage, industrial wastewater, and rainwater, and are crucial infrastructure for urban development and construction. As the core structures within urban drainage networks, lift pump stations are crucial for flood control, drainage, and water pollution control. Due to the significant investment in civil engineering and equipment for lift pump stations, rational design and ensuring their safe, stable, and efficient operation are crucial aspects of current urban drainage network planning.

[0004] Due to various constraints, such as urban land use, pipe network layout, and construction conditions, lift pump stations in urban drainage network systems often cannot be designed according to ideal hydraulic conditions. The overall layout of the lift pump stations is relatively cramped, and they usually need to be connected to the existing pipe network system through complex structural inlet culverts (such as circular inlet culverts). This makes the inflow conditions of the lift pump stations very complex, and it is easy for the pump station inlet buildings to produce undesirable flow patterns such as biased flow, backflow, vortexes, and mainstream centering or upward. At the same time, the domestic sewage, industrial wastewater, and rainwater transported by the lift pump stations in the urban drainage network system contain a large amount of solid particulate matter, which is prone to sedimentation in the lift pump station inlet buildings, causing siltation and blockage, further worsening the inlet flow pattern of the lift pump stations and seriously affecting the safe, stable, and efficient operation of the lift pump stations and even the entire urban drainage network system. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the deficiencies of the above-mentioned existing technologies and to provide a method for improving the anti-siltation capacity of the urban drainage network system lift pump station. The method for improving the anti-siltation capacity of the urban drainage network system lift pump station can rectify the undesirable flow states such as biased flow and backflow in the water intake building of the lift pump station without increasing the land area of ​​the lift pump station, thereby improving the flow rate and flow velocity distribution uniformity of the arc-shaped water inlet culvert, and improving the flow velocity and flow velocity distribution uniformity of the bottom layer of the pump station collection pool, thereby effectively preventing the sedimentation of solid particles in rainwater, sewage and wastewater from causing siltation problems in the water intake building of the lift pump station.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for improving an urban drainage pipe network system and enhancing the anti-siltation capability of a pump station comprises the following steps.

[0008] Step 1, diversion: The drainage of the urban drainage pipe network system enters the diversion well of the lift pump station through the water inlet main pipe; the drainage entering the diversion well is divided into two paths, one path enters the diversion culvert, and the other path enters the arc-shaped water inlet culvert of the lift pump station.

[0009] Step 2: water inlet rectification, including the following steps:

[0010] Step 2A, compartment division: the water flow entering the arc-shaped water inlet culvert is divided by the middle partition wall to form two compartment water flows; wherein the middle partition wall is set in the middle of the arc-shaped water inlet culvert along the water flow direction.

[0011] Step 2B, rectification of each bin: The water flow in each bin in step 2A is rectified by a pair of combined columns at the end of the corresponding bin, so that the flow distribution and flow velocity distribution in the two bins are uniform, thereby improving the siltation and blockage problem caused by water deviation in the local low-speed area inside the curved water inlet culvert.

[0012] Step 3, diffusion rectification, includes the following steps:

[0013] Step 3A, Diffusion: After the water inlet rectification, the water flow in each tank enters the diffusion section of the water collection tank in the lift pump station, and is collected and diffused in the diffusion section.

[0014] Step 3B, diffusion and rectification: During the diffusion process of step 3A, the water is rectified by a number of beams at different heights and perpendicular to the water flow direction.

[0015] Step 4, water collection: The water collection pool also includes a water collection section arranged at the tail end of the diffusion section. Several water pump units are arranged in parallel at the tail end of the water collection section, and a partition pier is set between two adjacent water pump units. Under the synergistic effect of the partition pier, the mainstream water flow after diffusion and rectification enters the water collection section and dives, thereby improving the flow velocity and distribution uniformity at the bottom of the water collection pool, reducing the large-scale backflow area and low flow velocity area at the bottom of the inlet section of the water collection pool, and improving the inlet conditions of the water pump unit.

[0016] Step 5: Clean up the sediment: When the main stream of water enters the water collection section and sinks, the sediment in the main stream of water will be deposited in the dead water area at the bottom of the water inlet wall of the water collection tank; use a sediment pump and a sediment pipe to clean up the deposited sediment in real time.

[0017] In step 1, the length, width, and height of the diversion well are L1, W1, and H1, respectively, where L1 = (2~3)W1 and H1 = 0.5W1. The diversion well inlet is located on one of its short sides and the center lines of the two coincide. The diversion well inlet is a circular cross-section with a diameter of D1, and D1 = (0.6~0.9)W1.

[0018] The two diversion outlets of the diversion well are both square in cross-section. The diversion outlet connected to the arc-shaped water inlet culvert is called the first diversion outlet, and the cross-sectional side length is B1; the diversion outlet connected to the diversion box culvert is called the second diversion outlet, and the cross-sectional side length is B2; then B1=B2=(0.5~1.0)D1.

[0019] The center lines of the two diversion outlets are both located at the center height of the diversion well; among them, the first diversion outlet is located on the long side of the diversion well and the distance between its center line and the side wall of the diversion well entrance is C1, C1=(0.5~0.8)B1; the second diversion outlet is located on the other short side of the diversion well and the center lines of the two coincide, and the diversion culvert is equipped with a gate.

[0020] In step 2A, the distance between the head of the middle partition wall and the inlet of the curved water inlet box culvert is C2 and C2=(0.8~1)B1; the height of the curved water inlet box culvert is H2 and H2=H1; the width of the two compartment outlets of the curved water inlet box culvert is W2 and W2=(0.8~1)B1; the center distance between the two compartment outlets is C3 and C3=(1.4~1.6)W2.

[0021] In step 2B, each pair of combined columns includes two columns, and the height of each column is H3, and H3=H2; the distance between the combined columns and the corresponding curved water inlet culvert outlet is L2, and L2=(1.4~2)W2; the upper side walls of the inner columns in the two pairs of combined columns are flush with the center lines of the corresponding curved water inlet culvert outlets; the cross-section of each column is rectangular, and its length and width are L3 and W3, respectively, where L3=(0.1~0.2)W2 and W3=(0.1~0.15)W2; the distance between the two columns in the two pairs of combined columns is C4 and C5, respectively, where C4=(0.2~0.4)W2 and C5=(0.1~0.2)W2.

[0022] In steps 3 and 4, the length, width, and height of the collection tank are L4, W4, and H4 respectively; the height from the water surface of the collection tank to the bottom of the collection tank is H5, and H5=(0.7~0.9)H4; the height between the bottom of the curved water inlet culvert and the bottom of the collection tank is H6, and H6=(0.2~0.3)H4; the diffusion angle of the diffusion section is α, and α=20°~40°; the number of water pump units is N, and N=3~5; the distance between the head of the dividing pier and the rear wall of the collection tank is L5, and L5=(0.3~0.35)L4; the width of the dividing pier is W5, and W5=(0.02~0.05)W4, and the height of the dividing pier is H7, and H7=(0.4~0.5)H4.

[0023] In step 3B, there are three beams, arranged in a "three" shape from top to bottom; both ends of each beam are connected to the side wall of the diffuser section; the height of the upper beam from the water surface is H8, and H8 = (0.05-0.1) H5; the heights of the three beams are L6, L7, and L8, respectively, and the widths are all W6, where L6 = (0.25-0.3) H2, L7 = (0.25-0.3) H2, L8 = (0.2-0.25) H2, and W6 = (0.1-0.15) W2; the distances between adjacent beams are C6 and C7, where C6 = (0.05-0.1) H2 and C7 = (0.1-0.15) H2.

[0024] In step 5, a sand discharge pipe is provided at the bottom of each of the two inlet side walls of the water collection tank. The center lines of the two sand discharge pipes correspond to the center lines of the outlets of the two compartments of the arc-shaped water inlet culvert respectively. The diameter of each sand discharge pipe mouth is D2 and D2=(0.1~0.2)W2. The bottom of the sand discharge pipe mouth is flush with the bottom of the water collection tank. The sand discharge pipe mouth is provided with an on-off valve, and a sand discharge pump is provided at the end of the sand discharge pipe.

[0025] The total water inlet flow of the main inlet pipe is Q, the water inlet flow of the arc inlet box culvert is Q1 and Q1=(0.5~1)Q, and the water inlet flow of the diversion box culvert is Q2 and Q2=Q-Q1.

[0026] The water inlet main pipe, diversion well, curved water inlet box culvert, collection tank, diversion box culvert and separation pier are all reinforced concrete structures; the combined columns and each beam are metal structures or reinforced concrete structures.

[0027] The width W1 of the diversion well is 7m, the length L1 is 14m, and the height H1 is 3.5m. The diameter D1 of the diversion well entrance is D1=4.2m. The side lengths B1 and B2 of the two diversion outlets of the diversion well are both 4m. The distance C1 between the first diversion outlet and its entrance side wall is 3.2m. The distance C2 between the head of the middle partition wall and the inlet of the curved water inlet culvert is 3.8m. The height H2 of the curved water inlet culvert is 3.5m. The two compartments of the curved water inlet culvert are The outlet width W2 is 4m, the center distance C3 of the two warehouse outlets is 6m, the height H3 of each column is 3.5m, the distance L2 between the combined column and the corresponding curved water inlet culvert outlet is 6.5m, the rectangular section length L3 of the combined column is 0.55m, the width W3 is 0.4m, the distance C4 between the two columns in the two pairs of combined columns is 0.8m, C5 is 0.4m, the length L4 of the water collection tank is 20m, the width W4 is 1 The height H5 of the water collection tank is 6.5m, the height H6 between the bottom of the curved water inlet box culvert and the bottom of the water collection tank is 2.3m, the diffusion angle α of the diffusion section is 40°, the number of water pump units N is 3, the distance L5 between the head of the dividing pier and the rear wall of the water collection tank is 6.5m, the width W5 of the dividing pier is 0.6m, the height H7 of the dividing pier is 4m, the height H8 of the upper beam above the water surface is 0.6m, the heights L6, L7 and L8 of the three beams are 1m, 1m and 0.7m, and the widths W6 are all 0.4m. The distances C6 and C7 between adjacent beams are 0.3m and 0.4m, respectively. The diameter D2 of the sediment discharge pipe outlet is 0.4m. The water inlet main pipe, diversion well, curved water inlet box culvert, water collection tank of the pump station, diversion box culvert and dividing pier are all reinforced concrete structures, and the combined columns and each beam are metal structures.

[0028] The present invention has the following beneficial effects:

[0029] 1. The above-mentioned combined columns can rectify the water flow in the two chambers of the curved water inlet culvert, thereby improving the uniformity of flow distribution and flow velocity distribution in the two chambers of the curved water inlet culvert, and further improving the problem of siltation and blockage in the local low-speed area caused by deviation of the water flow inside the curved water inlet culvert.

[0030] 2. The above-mentioned "three"-shaped crossbeam can further rectify the water flow entering the pump station collection pool from the arc-shaped water inlet culvert, and combined with the diffusion section of the collection pool inlet and the partition piers between the pump units, the main flow of water entering the pump station collection pool is lowered, thereby increasing the flow velocity at the bottom of the pool and its distribution uniformity, reducing the large-scale backflow area and low flow velocity area at the bottom of the pump station collection pool inlet section, and improving the inlet conditions of the pump unit. At the same time, the sand pump is used to clean the sediment deposited in the dead water area at the bottom of the water inlet wall of the collection pool in real time through the sand discharge pipe, thereby achieving comprehensive and effective prevention of siltation problems in the pump station collection pool, improving the urban drainage network system, enhancing the anti-siltation ability of the pump station, and ensuring its safe, stable and efficient operation.

[0031] 3. The combined columns, "three"-shaped beams, dividing piers, sand discharge pipes and other structural forms adopted in the present invention are simple and easy to construct and manufacture. They can realize hydraulic self-dredging and save dredging costs. They are suitable for promotion and use in the design and renovation projects of urban drainage network system lifting pump stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Shown is a schematic diagram of the planar layout of the lifting pump station in the present invention.

[0033] Figure 2 A schematic diagram of the planar structural dimensions of the lifting pump station in the present invention is shown.

[0034] Figure 3 A schematic diagram of the elevation structure dimensions of the water collection tank of the lifting pump station in the present invention is shown.

[0035] Figure 4 A comparison chart of the sediment deposition efficiency of the lift pump station of the present invention before and after rectification is shown.

[0036] Among them are:

[0037] 1. Water inlet main pipe; 2. Diversion well; 3. Curved water inlet culvert; 3A. Curved water inlet culvert compartment 1; 3B. Curved water inlet culvert compartment 2; 4. Water collection tank; 5. Water pump unit; 6. Diversion culvert; 7. Middle partition wall; 8. Combination column; 8A. Combination column for compartment 1; 8B. Combination column for compartment 2; 9. Separation pier; 10. "Three" shaped crossbeam; 11. Diversion culvert gate; 12. Sand discharge pipe; 13. Regulating valve; 14. Sand discharge pump.

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0039] In the description of the present invention, it should be understood that the terms "left side," "right side," "upper," "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Terms such as "first" and "second" do not indicate the importance of components and therefore should not be construed as limitations on the present invention. The specific dimensions used in this embodiment are intended only to illustrate the technical solution and do not limit the scope of protection of the present invention.

[0040] like Figures 1 to 3 As shown, a method for improving the urban drainage network system and enhancing the anti-siltation capacity of the pump station includes the following steps.

[0041] Step 1, diversion: The drainage of the urban drainage pipe network system enters the diversion well 2 of the lifting pump station through the water inlet main 1; the drainage entering the diversion well is divided into two paths, one path enters the diversion culvert 6, and the other path enters the arc-shaped water inlet culvert 3 of the lifting pump station.

[0042] The length, width and height of the above-mentioned diversion well are L1, W1 and H1 respectively, among which the preferred dimensions are: L1=(2~3)W1, H1=0.5W1, the diversion well inlet is located on one of its short sides and the center lines of the two coincide, the diversion well inlet is a circular cross-section with a diameter of D1, and D1=(0.6~0.9)W1.

[0043] Furthermore, the two diversion outlets of the diversion well are both square in cross-section. The diversion outlet connected to the arc-shaped water inlet culvert is called the first diversion outlet, and the cross-sectional side length is B1; the diversion outlet connected to the diversion box culvert is called the second diversion outlet, and the cross-sectional side length is B2; then B1=B2=(0.5~1.0)D1.

[0044] The center lines of the two diversion outlets are both located at the center height of the diversion well; among them, the first diversion outlet is located on the long side of the diversion well and the distance between its center line and the side wall of the diversion well entrance is C1, C1=(0.5~0.8)B1; the second diversion outlet is located on the other short side of the diversion well and the center lines of the two coincide. The diversion box culvert is provided with a gate 11 for adjusting the flow distribution of the lifting pump station.

[0045] Furthermore, the total water flow of the water inlet main is Q, the water flow of the arc-shaped water inlet box culvert is Q1 and Q1=(0.5~1)Q, and the water flow of the diversion box culvert is Q2 and Q2=Q-Q1.

[0046] Step 2: water inlet rectification, including the following steps.

[0047] Step 2A, compartment division: the water flow entering the arc-shaped water inlet culvert is divided by the middle partition wall to form two compartment water flows; wherein the middle partition wall is set in the middle of the arc-shaped water inlet culvert along the water flow direction.

[0048] The arc-shaped water inlet culvert 3 is divided into two compartments, namely 3A and 3B, by an arc-shaped middle partition wall 7. The distance between the head of the middle partition wall 7 and the inlet of the arc-shaped water inlet culvert 3 is C2, and C2=(0.8~1)B1. If the distance C2 is too small or too large, it will be difficult to ensure the uniformity of the flow distribution of the two compartments of the arc-shaped water inlet culvert. The height of the arc-shaped water inlet culvert 3 is H2, and H2=H1. The width of the two compartment outlets of the arc-shaped water inlet culvert 3 is W2, and W2=(0.8~1)B1. If the width W2 of the arc-shaped water inlet culvert outlet is too large, the flow velocity of the water inlet culvert will be too low, causing siltation. If W2 is too small, the main flow entering the pump station sump 4 will be too centered, which will be detrimental to the inlet flow of the side units in the water pump unit 5 and affect its operating efficiency and stability.

[0049] Step 2B, rectification of each bin: The water flow in each bin in step 2A is rectified by a pair of combined columns at the end of the corresponding bin, so that the flow distribution and flow velocity distribution in the two bins are uniform, thereby improving the siltation and blockage problem caused by water deviation in the local low-speed area inside the curved water inlet culvert.

[0050] The outlet center distance between the two chambers 3A and 3B of the arc-shaped water inlet culvert is C3, and preferably C3=(1.4~1.6)W2. If the distance C3 is too large or too small, the water flow rate of the water collection tank will be unevenly distributed. A pair of combined columns 8A and 8B are respectively set at the ends of the two chambers 3A and 3B of the arc-shaped water inlet culvert. The height of the combined columns 8A and 8B is H3 and the same as the height of the water inlet culvert, that is, H3=H2. The distance between the combined columns 8A and 8B and the outlet of the adjacent arc-shaped water inlet culvert 3 is L2, and L2=(1.4~2)W2. The distance L2 is too large. If it is too small or too large, it is not conducive to the effect of rectifying the biased flow in the curved water inlet culvert 3. The upper side walls of the inner columns in the combined columns 8A and 8B are flush with the center lines of the corresponding curved water inlet culvert outlets. The cross-section of the combined column 8 is rectangular and its length and width are L3 and W3 respectively, where L3 = (0.1~0.2) W2 and W3 = (0.1~0.15) W2. The column spacing in the combined columns 8A and 8B is C4 and C5 respectively, where C4 = (0.2~0.4) W2 and C5 = (0.1~0.2) W2.

[0051] Step 3: diffusion rectification, including the following steps.

[0052] Step 3A: Diffusion

[0053] The water collection tank 4 of the lifting pump station is arranged at the tail end of the arc-shaped water inlet culvert 3, and includes a diffuser section and a water collection section that are integrally arranged.

[0054] The length, width and height of the pump station collection tank 4 connected to the curved water inlet culvert 3 are L4, W4 and H4 respectively. The height between the water surface of the collection tank 4 and the bottom of the collection tank 4 is H5 and H5=(0.7~0.9)H4. The height between the bottom of the curved water inlet culvert 3 and the bottom of the pump station collection tank 4 is H6 and H6=(0.2~0.3)H4. The inlet section of the collection tank 4 is a diffusion section with a diffusion angle of α and α=20°~40°. If the diffusion angle α is too large, it is not suitable for the pump station inflow, and if it is too small, the volume of the collection tank 4 will be too large.

[0055] After the water inlet rectification, the water flow in each tank enters the diffusion section of the water collection tank in the lift pump station, and is collected and diffused in the diffusion section.

[0056] Step 3B, diffusion and rectification: During the diffusion process of step 3A, the water is rectified by a number of beams at different heights and perpendicular to the water flow direction.

[0057] A "three" shaped crossbeam 10 is set in the middle of the diffusion section of the inlet of the above-mentioned water collection tank 4 along the height direction of the water collection tank. The "three" shaped crossbeam 10 is three crossbeams facing the outlet of the arc-shaped water inlet box 3 and connected to the side walls of the diffusion section on both sides of the water collection tank 4 at both ends. The height of the first crossbeam from the upper layer is H8 from the water surface and H8=(0.05~0.1)H5. If the height H8 is too large, it will affect the effect of improving the mainstream diving, and if it is too small, it will cause the surface water flow rate to decrease. The heights of the three crossbeams are L6, L7, and L8 respectively, and the widths are all W6, where L6= (0.25~0.3)H2, L7=(0.25~0.3)H2, L8=(0.2~0.25)H2, W6=(0.1~0.15)W2. If the height of a single beam of the "three"-shaped beam 10 is too large, it will affect the flow cross-sectional area of ​​the water collection pool; if it is too small, it will not have a rectification effect. The distances between two adjacent beams are C6 and C7 respectively, among which C6=(0.05~0.1)H2 and C7=(0.1~0.15)H2. If the distances C6 and C7 are too large or too small, the rectification effect will be poor.

[0058] Step 4, water collection: The water collection pool also includes a water collection section arranged at the tail end of the diffusion section. Several water pump units are arranged in parallel at the tail end of the water collection section, and a partition pier is set between two adjacent water pump units. Under the synergistic effect of the partition pier, the mainstream water flow after diffusion and rectification enters the water collection section and dives, thereby improving the flow velocity and distribution uniformity at the bottom of the water collection pool, reducing the large-scale backflow area and low flow velocity area at the bottom of the inlet section of the water collection pool, helping to reduce the degree and range of siltation at the bottom of the water collection pool, and improving the inlet conditions of the water pump unit.

[0059] The number of the above-mentioned water pump units 5 is N and preferably N=3~5. Partition piers 9 are set between the water pump units 5. The distance between the head of the partition pier 9 and the rear wall of the water collection tank 4 is L5 and L5=(0.3~0.35)L4. If the distance L5 is too large, it is not conducive to the inlet flow condition when there are few units in operation. If the distance L5 is too small, it is not conducive to the diversion between the water pump units. The width of the partition pier 9 is W5 and W5=(0.02~0.05)W4. If the width W5 is too small, it is difficult to ensure the safety of its structure. If it is too large, it will occupy the flow cross-sectional area. The height of the partition pier 9 is H7 and H7=(0.4~0.5)H4. If the height is too low, it is not conducive to water pump diversion. If it is too high, the improvement of its rectification effect is not significant.

[0060] Step 5: Clean up the sediment: When the main stream of water enters the water collection section and sinks, the sediment in the main stream of water will be deposited in the dead water area at the bottom of the water inlet wall of the water collection tank; use a sediment pump and a sediment pipe to clean up the deposited sediment in real time.

[0061] In the above step 5, a sand discharge pipe is provided at the bottom of each of the two inlet side walls of the water collection tank. The center lines of the two sand discharge pipes correspond to the center lines of the outlets of the two compartments of the arc-shaped water inlet culvert respectively. The diameter of each sand discharge pipe opening is D2 and D2=(0.1~0.2)W2. The bottom of the sand discharge pipe opening is flush with the bottom of the water collection tank to facilitate better sand suction and discharge. The sand discharge pipe opening is provided with an on-off valve to adjust its opening and closing of the drainage pipe. A sand discharge pump is provided at the end of the sand discharge pipe to transport the accumulated particulate matter.

[0062] Furthermore, the above-mentioned water inlet main pipe, diversion well, curved water inlet culvert, collection tank, diversion culvert and dividing pier are preferably reinforced concrete structures; the combined columns and each beam are preferably metal structures or reinforced concrete structures to meet the design, construction and use requirements of the urban drainage network system lifting pump station.

[0063] The following describes the effects of the implementation of the present invention in detail with reference to specific embodiments. Example

[0064] The width W1 of the diversion well 1 is 7m, the length L1 is 14m, and the height H1 is 3.5m. The inlet diameter D1 of the diversion well 1 is D1=4.2m. The side lengths B1 and B2 of the two outlets of the diversion well 1 are both 4m. The distance C1 between the outlet of the diversion well 2 connected to the arc-shaped water inlet culvert 3 and its inlet side wall is 3.2m. The distance C2 between the head of the arc-shaped middle partition wall 7 and the inlet of the arc-shaped water inlet culvert 3 is 3.8m. The height H2 of the arc-shaped water inlet culvert 3 is 3.5m. The width of the two compartment outlets of the arc-shaped water inlet culvert 3 is W2 is 4m and the center distance C3 between the two bin outlets is 6m. The height H3 of the combined column 8 set at the end of the two bins 3A and 3B of the curved water inlet box culvert is 3.5m. The distance L2 between the combined column 8 and the adjacent curved water inlet box culvert outlet is 6.5m. The length L3 of the rectangular section of the combined column 8 is 0.55m and the width W3 is 0.4m. The column spacing C4 between the combined columns 8A and 8B of the inner and outer bins of the curved water inlet box culvert is 0.8m and C5 is 0.4m. The length L4 of the pump station collection tank 4 is 20m, width W4 is 15m, height H4 is 8m, the height H5 of the water surface from the bottom of the water collection tank is 6.5m, the height H6 between the bottom of the arc-shaped water inlet box culvert 3 and the bottom of the pump station water collection tank 4 is and H6=2.3m, the inlet diffusion angle α of the water collection tank 4 is 40°, the number N of water collection tank pump units 5 is 3, the distance L5 between the head of the dividing pier 9 and the rear wall of the water collection tank 4 is 6.5m, the width W5 of the dividing pier 9 is 0.6m, the height H7 is 4m, and the upper layer of the "three"-shaped crossbeam 10 is The height H8 of a beam from the water surface is 0.6m. The heights L6, L7 and L8 of the three beams are 1m, 1m and 0.7m, and the widths W6 are all 0.4m. The distances C6 between adjacent beams are 0.3m and C7 are 0.4m. The diameter D2 of the 12 sand discharge pipes is 0.4m. The water inlet main pipe 1, diversion well 2, curved water inlet culvert 3, pump station collection tank 5, diversion culvert 6 and dividing pier 9 are reinforced concrete structures. The combined columns 8 and "three" shaped beams 10 are metal structures.

[0065] Implementation effect evaluation

[0066] like Figure 4 As shown, a three-dimensional flow numerical simulation method is used to compare and analyze the sediment deposition efficiency before and after the rectification of the lifting pump station according to the above embodiment of the present invention, wherein the sediment deposition efficiency η =( Q in - Q out ) / Q in , Q in 、 Q out Represent the volume concentration of sediment at the arc-shaped water inlet culvert inlet and the pump unit outlet, η The larger the value, the more serious the siltation in the water inlet building of the lift pump station.Figure 4 It can be seen that the sediment deposition efficiency in the water inlet building of the lifting pump station after rectification of the present invention is η It is greatly reduced, which proves that the present invention can significantly improve the anti-siltation ability of the urban drainage pipe network system lifting pump station, and help ensure the safe, stable and efficient operation of the lifting pump station and even the entire urban drainage pipe network system.

[0067] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A method for improving the anti-siltation capability of a pump station in an urban drainage network system, characterized by: The steps include: Step 1: Diversion: Drainage from the urban drainage network system enters the diversion well of the lift pump station through the water inlet main pipe; the drainage entering the diversion well is divided into two paths, one entering the diversion box culvert and the other entering the curved inlet box culvert of the lift pump station; wherein, the total outlet width of the curved inlet box culvert is greater than the inlet width; the height of the curved inlet box culvert is H2, and the width of the two compartment outlets of the curved inlet box culvert is W2; Step 2: water inlet rectification, including the following steps: Step 2A, compartment division: The water flow entering the curved water inlet culvert is divided into two compartments by a middle partition wall; wherein the middle partition wall is arranged in the middle of the curved water inlet culvert along the water flow direction; Step 2B, rectification of each bin: The water flow in each bin in step 2A is rectified by a pair of combined columns at the end of the corresponding bin, so that the flow distribution and flow velocity distribution in the two bins are uniform, thereby improving the siltation and blockage problem caused by the deviation of water flow in the local low-speed area inside the arc-shaped water inlet culvert; each pair of combined columns includes two columns, and the height of each column is H3 and H3=H2; the distance between the combined columns and the corresponding arc-shaped water inlet culvert outlet is L2 and L2=(1 .4~2)W2; the upper side walls of the inner columns in the two pairs of combined columns are flush with the centerline of the corresponding curved water inlet box culvert outlet; each column has a rectangular cross-section with a length and width of L3 and W3, respectively, where L3 = (0.1~0.2)W2 and W3 = (0.1~0.15)W2; the spacing between the two columns in the two pairs of combined columns is C4 and C5, respectively, where C4 = (0.2~0.4)W2 and C5 = (0.1~0.2)W2; Step 3, diffusion rectification, includes the following steps: Step 3A, Diffusion: After the inlet rectification, the water flow of each tank enters the diffusion section of the water collection tank in the lift pump station, and is collected and diffused in the diffusion section; Step 3B, diffusion and rectification: During the diffusion process of step 3A, the water is rectified by three beams of different heights and perpendicular to the water flow direction; the three beams are arranged in a "three" shape from top to bottom; both ends of each beam are connected to the side wall of the diffusion section; the height of the upper beam from the water surface is H8 and H8 = (0.05~0.1) H5; the heights of the three beams are L6, L7, and L8 respectively, and the width is W6. In the figure, L6=(0.25~0.3)H2, L7=(0.25~0.3)H2, L8=(0.2~0.25)H2, W6=(0.1~0.15)W2; the distances between two adjacent beams are C6 and C7 respectively, among which C6=(0.05~0.1)H2 and C7=(0.1~0.15)H2; among which H5 is the height from the water surface to the bottom of the water collection tank; Step 4: Water collection: The water collection pool also includes a water collection section at the tail end of the diffusion section. Several water pump units are arranged in parallel at the tail end of the water collection section, and a partition pier is set between two adjacent water pump units. Under the synergistic effect of the partition pier, the main flow of water after diffusion and rectification enters the water collection section and dives, thereby improving the flow velocity and distribution uniformity at the bottom of the water collection pool, reducing the large-scale backflow area and low flow velocity area at the bottom of the water collection pool inlet section, and improving the inlet conditions of the water pump units. Step 5: Clean up the sediment: When the main stream of water enters the water collection section and sinks, the sediment in the main stream of water will be deposited in the dead water area at the bottom of the water inlet wall of the water collection tank; use a sediment pump and a sediment pipe to clean up the deposited sediment in real time.

2. The method for improving the anti-siltation capability of a pump station in an urban drainage network system according to claim 1, characterized in that: In step 1, the length, width, and height of the diversion well are L1, W1, and H1, respectively, where L1 = (2-3) W1 and H1 = 0.5 W1. The diversion well inlet is located on one of its short sides, and the center lines of the two coincide. The diversion well inlet is a circular cross-section with a diameter of D1, and D1 = (0.6-0.9) W1. The two diversion outlets of the diversion well are both square in cross-section. The diversion outlet connected to the arc-shaped water inlet culvert is called the first diversion outlet, and its cross-section side length is B1; the diversion outlet connected to the diversion culvert is called the second diversion outlet, and its cross-section side length is B2. Then B1=B2=(0.5~1.0)D1; The center lines of the two diversion outlets are both located at the center height of the diversion well; among them, the first diversion outlet is located on the long side of the diversion well and the distance between its center line and the side wall of the diversion well entrance is C1, C1=(0.5~0.8)B1; the second diversion outlet is located on the other short side of the diversion well and the center lines of the two coincide, and the diversion culvert is equipped with a gate.

3. The method for improving the anti-siltation capability of a pump station in an urban drainage network system according to claim 2, characterized in that: In step 2A, the distance between the head of the middle partition wall and the inlet of the curved water inlet box culvert is C2, and C2 = (0.8~1)B1; the height of the curved water inlet box culvert is H2 = H1; the width of the two compartment outlets of the curved water inlet box culvert is W2 = (0.8~1)B1; the center distance between the two compartment outlets is C3, and C3 = (1.4~1.6)W2.

4. The method for improving the anti-siltation capability of a pump station in an urban drainage network system according to claim 3, characterized in that: In steps 3 and 4, the length, width, and height of the collection tank are L4, W4, and H4 respectively, and the height from the water surface of the collection tank to the bottom of the collection tank is H5 = (0.7~0.9)H4; the height between the bottom of the curved water inlet culvert and the bottom of the collection tank is H6 and H6 = (0.2~0.3)H4; the diffusion angle of the diffusion section is α and α = 20°~40°; the number of water pump units is N and N = 3~5; the distance between the head of the dividing pier and the rear wall of the collection tank is L5 and L5 = (0.3~0.35)L4; the width of the dividing pier is W5 and W5 = (0.02~0.05)W4, and the height of the dividing pier is H7 and H7 = (0.4~0.5)H4.

5. The method for improving the anti-siltation capability of a pump station in an urban drainage pipe network system according to claim 4, characterized in that: In step 5, a sand discharge pipe is provided at the bottom of each of the two inlet side walls of the water collection tank. The center lines of the two sand discharge pipes correspond to the center lines of the outlets of the two compartments of the arc-shaped water inlet culvert respectively. The diameter of each sand discharge pipe mouth is D2 and D2=(0.1~0.2)W2. The bottom of the sand discharge pipe mouth is flush with the bottom of the water collection tank. The sand discharge pipe mouth is provided with an on-off valve, and a sand discharge pump is provided at the end of the sand discharge pipe.

6. The method for improving the anti-siltation capability of a pump station in an urban drainage network system according to claim 5, characterized in that: The total water inlet flow of the main inlet pipe is Q, the water inlet flow of the arc inlet box culvert is Q1 and Q1=(0.5~1)Q, and the water inlet flow of the diversion box culvert is Q2 and Q2=Q-Q1.

7. The method for improving the anti-siltation capability of a pump station in an urban drainage network system according to claim 6, characterized in that: The water inlet main pipe, diversion well, curved water inlet box culvert, collection tank, diversion box culvert and separation pier are all reinforced concrete structures; the combined columns and each beam are metal structures or reinforced concrete structures.

8. The method for improving the anti-siltation capability of a pump station in an urban drainage pipe network system according to claim 7, characterized in that: The width W1 of the diversion well is 7m, the length L1 is 14m, and the height H1 is 3.5m. The diameter D1 of the diversion well entrance is D1=4.2m. The side lengths B1 and B2 of the two diversion outlets of the diversion well are both 4m. The distance C1 between the first diversion outlet and its entrance side wall is 3.2m. The distance C2 between the head of the middle partition wall and the inlet of the curved water inlet culvert is 3.8m. The height H2 of the curved water inlet culvert is 3.5m. The two compartments of the curved water inlet culvert are The outlet width W2 is 4m, the center distance C3 of the two warehouse outlets is 6m, the height H3 of each column is 3.5m, the distance L2 between the combined column and the corresponding curved water inlet culvert outlet is 6.5m, the rectangular section length L3 of the combined column is 0.55m, the width W3 is 0.4m, the distance C4 between the two columns in the two pairs of combined columns is 0.8m, C5 is 0.4m, the length L4 of the water collection tank is 20m, the width W4 is 1 The height H5 of the water collection tank is 6.5m, the height H6 between the bottom of the curved water inlet box culvert and the bottom of the water collection tank is 2.3m, the diffusion angle α of the diffusion section is 40°, the number of water pump units N is 3, the distance L5 between the head of the dividing pier and the rear wall of the water collection tank is 6.5m, the width W5 of the dividing pier is 0.6m, the height H7 of the dividing pier is 4m, the height H8 of the upper beam above the water surface is 0.6m, the heights L6, L7 and L8 of the three beams are 1m, 1m and 0.7m, and the widths W6 are all 0.4m. The distances C6 and C7 between adjacent beams are 0.3m and 0.4m, respectively. The diameter D2 of the sediment discharge pipe outlet is 0.4m. The water inlet main pipe, diversion well, curved water inlet box culvert, water collection tank of the pump station, diversion box culvert and dividing pier are all reinforced concrete structures, and the combined columns and each beam are metal structures.

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