CN114032798B - A method to ensure the uniform outflow of the water tank and culvert by porous diffusion in the urban drainage pumping station - Google Patents

Abstract

The invention discloses a method for ensuring the uniform outflow of a water tank culvert by porous diffusion and diversion in an urban flood drainage pump station. Two composite beams and short diversion piers adjust the water flow of the two holes after the entrance of the box culvert respectively, so that the entering water flow is divided into two branches with roughly similar flow rates. The function of the horizontal distribution of water flow, the two composite beams further rectify the water flow in the vertical and horizontal directions in the overflow channel and near the outlet, respectively, to homogenize the horizontal distribution of the water flow and press down the main flow, and multiple rectification measures realize porous diffusion and split flow. The homogenization effect of the effluent flow velocity distribution of the outlet box culvert can realize the homogenization of the outlet velocity distribution, which is helpful to improve the outlet flow state of the porous diffusion and split flow outlet box culvert. Engineering application value.

Description

A method to ensure the uniform outflow of the water tank and culvert by porous diffusion in the urban drainage pumping station

technical field

The invention belongs to the technical field of municipal flood drainage pump station engineering, in particular to a method for ensuring uniform outflow from a water tank and culvert by porous diffusion and shunting of an urban flood drainage pump station.

Background technique

In recent years, due to the influence of various factors such as global climate change and social and economic development, urban rainstorms and waterlogging have become a common problem faced by many countries and regions in the world. Under this circumstance, the urban flood drainage pump station, which is usually used to prevent and control urban waterlogging, has become one of the important contents of current urban infrastructure construction to remove the accumulated water in urban low-lying areas and drainage pipelines.

Outlet box culverts are commonly used water outlet structures in urban drainage pump stations. They are often limited by urban planning land shortages, terrain conditions, large drainage and drainage water flow, and construction conditions. The water flow velocity at the outlet of the water tank culvert. However, for the outlet box culvert with porous diffusion and split flow, especially when the diffusion angle is too large, the flow pattern of the water flow will be turbulent, and the water flow will be difficult to spread evenly, resulting in the formation of unfavorable flow patterns such as the center of the mainstream and the backflow vortex. In this case, for the urban drainage pumping station, in addition to the large hydraulic loss and local sediment deposition in the box culvert, there will also be uneven distribution of flow velocity at the outlet of the box culvert, which seriously affects the urban drainage pumping station. Safe and stable operation and navigation safety in the connecting river.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is aimed at the deficiencies of the above-mentioned prior art, and provides a method for ensuring the uniform outflow of the urban waterlogging pumping station by porous diffusion and shunting out of the water tank culvert. In the method of uniform flow, the multi-rectification measures of setting semi-circular head diversion short piers, bottom sills and two composite beams in the porous diffusion and diverted outflow tank culverts of the urban drainage pump station can realize the distribution of the water flow rate of the porous diffusion diverted outflow water tank and culvert. The homogenization effect is helpful to improve the effluent flow state of the porous diffusion shunt effluent tank culvert.

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A method for ensuring uniform outflow from a water tank culvert by porous diffusion of an urban drainage pump station, comprising the following steps.

Step 1. Lay out the outlet box culvert with porous diffusion and split flow: connect the inlet of the outlet box culvert with the outlet well of the urban drainage pump station, and connect the outlet of the outlet box culvert with the outside river; among them, the outlet box culvert is arranged in order from left to right There are n-1 partition walls, which are partition wall G1, partition wall G2, partition wall G3, ..., partition wall G(n-1); among them, n=4k, k is a natural number; It includes inclined section, transition section and horizontal section; among them, the horizontal section is evenly arranged in the outlet section of the outlet box culvert; the inclined section of each partition wall is located in the diffusion section of the outlet box culvert, and the transition section is used to connect the inclined section And the horizontal section; the setting of n-1 partition walls makes the outlet box culvert show n-hole diffusion and diversion along the mainstream direction; at the same time, a slope is set in the middle of the diffusion section of the outlet box culvert.

Step 2. Form two-hole water flow: the water flow from the outlet well of the urban drainage pump station flows in from the inlet of the water outlet box culvert, and is separated by the partition wall G(n/2) located on the central axis to form two-hole water flow with the same left and right flow. ; The two holes are the left hole water flow and the right hole water flow respectively.

Step 3. Form four-hole water flow: set a short diversion pier with a semi-circular head at the upstream end of the partition wall G (n/4) and the partition wall G (3n/4); Under the action of (n/4) and the corresponding short diversion piers, two uniform water flows with the same flow rate are formed, which are the first water flow in the left hole and the second water flow in the left hole respectively; Under the action of the corresponding diversion short piers, two uniform water flows with the same flow rate are formed, which are the first water flow in the right hole and the second water flow in the right hole.

Step 4. Horizontal homogenization of the four-hole water flow: on the side of the partition wall G(n/4), both sides of the partition wall G(n/2), and on the side of the partition wall G(3n/4), which are all located upstream of the slope. A bottom sill is arranged to make the water flow of the four-hole flow channel have the effect of outwardly deflecting and homogenizing the horizontal distribution of the water flow.

Step 5. Vertical and horizontal rectification of the four-hole water flow: on the side of the partition wall G(n/4), both sides of the partition wall G(n/2), and the partition wall G(3n/4 ) on one side, a composite beam section is arranged on each side, and four composite beam sections constitute the first composite beam; the setting of the first composite beam can make the water flow entering the upstream and slope of the remaining partition walls vertically and horizontally. Rectification plays the role of homogenizing the lateral distribution of water flow and pressing down the mainstream.

Step 6. Vertical and horizontal rectification of the water outlet: After the four-hole water flow completed by the rectification in Step 5, after passing through the remaining partition walls and the slope in turn, is rectified vertically and horizontally by the second beam, and then enters the outlet of the water outlet box culvert section; wherein the second beam is perpendicular to the horizontal section of the partition wall.

Step 7. Homogenize the flow rate: After the effluent in step 6 is rectified vertically and horizontally, under the action of n-1 horizontal sections of partition walls, an n-hole effluent flow state with uniform flow rate distribution is formed.

n=8, there are 7 partition walls arranged from left to right in the outlet tank culvert, namely, the partition wall G1, the partition wall G2, the partition wall G3, ..., the partition wall G7; among them, the partition wall G (n/2 ) is the partition wall G4, and the partition wall G(n/4) and the partition wall G(3n/4) are the partition wall G2 and the partition wall G6 respectively; The partition walls G2 and G6, and the partition walls G3 and G5 are respectively symmetrical about the center line of the outlet box culvert in the inclined section of the partition wall.

In step 1, the dimensions of the outlet box culvert are: the length is L, the diffusion angle is θ, and the outlet inclination angle is Ω; in step 2, the width and height of the left and right holes separated by the partition wall G4 are both W and H. ;The distance between the head of the partition wall G1 and the center line of the outlet box culvert is W1=2.18W, the distance between the head of the partition wall G1 and the inlet of the outlet box culvert L1=0.372L, the distance between the head of the partition wall G1 and the center line of the outlet box culvert is L1=0.372L. The included angle α=0.374θ, the distance between the head of the partition wall G2 and the center line of the outlet box culvert W2=0.767W, the distance between the head of the partition wall G2 and the inlet of the outlet box culvert L2=0.138L, the partition wall G2 is in the diffusion section and The included angle of the center line of the outlet box culvert β=0.257θ, the distance between the head of the partition wall G3 and the center line of the outlet box culvert W3=0.774W, the distance between the head of the partition wall G3 and the inlet of the outlet box culvert L3=0.414L, the partition The angle γ=0.12θ between the diffusion section of wall G3 and the center line of the outlet box culvert; the transition sections in each partition wall are arcs with a radius of R = 1.67W; in step 1, the slope is set at the bottom of the diffusion section, and the It slopes downward in the direction of the main flow, the horizontal length of the slope is L4=0.121L, the angle between the slope and the horizontal direction is ζ=0.083θ, the width of the single hole at the outlet of the water tank and culvert is W4=1.23W, and the height of the single hole is H1=H+L4* tanζ.

In step 3, the top and bottom of the short diversion pier are connected to the top and bottom surfaces of the outlet box culvert respectively, the width of the short diversion pier D1=0.10W, the length of the short diversion pier L5=0.091L, in step 3 , the top and bottom of the short diversion pier are connected to the top and bottom surfaces of the outlet box culvert respectively. The width of the short diversion pier is D1=0.10W, the length of the short diversion pier is L5=0.091L, and the The angle between the short flow pier and the center line of the outlet box culvert δ=0.10～0.21θ, the angle between the short diversion pier at the upstream end of the partition wall G6 and the center line of the outlet box culvert ε=0.10～0.21θ; the short diversion at the upstream end of the partition wall G2 The distance between the head of the pier and the partition wall G4 is W5=0.4～0.6W, and the distance between the head of the diversion short pier at the upstream end of the partition wall G6 and the partition wall G4 is W6=0.4～0.6W.

In step 4, the width of the bottom sill is D2=0.1W, the bottom sill on one side of the partition wall G2, the bottom sill on both sides of the partition wall G4 and the bottom sill on one side of the partition wall G6, the connecting lines of the four bottom sills are formed into a ")" shape. Shape; the bottom sill on one side of the partition wall G2 and the bottom sill on the one side of the partition wall G6 are symmetrically arranged along the center line of the outlet box culvert; the bottom sill on one side of the partition wall G2 is perpendicular to the partition wall G2, and the length is L6=0.4W; the partition wall The distance L7=0.103L from the intersection of the bottom sill on one side of G2 and the partition wall G2 to the head of the partition wall G2, the bottom sills on both sides of the partition wall G4 are perpendicular to the partition wall G4, and the length of the bottom sill on the partition wall G4 toward the partition wall G2 is L8=0.4～0.45W, and the length of the bottom sill on the partition wall G4 toward the partition wall G6 is L9=0.4～0.45W; The height of all sills is H2=0.25H.

In steps 6 and 7, the first composite beam and the second composite beam are the upper and lower beams that are parallel to each other; the first composite beam is symmetrically arranged along the center line of the outlet box culvert and is in phase with the center line of the outlet box culvert. Vertical; the widths of the first composite beam and the second composite beam are both D3=0.2W. In the first composite beam and the second composite beam, the height of the upper beam is H3=0.2H, and the first composite beam has a height of H3=0.2H. In the beam and the second composite beam, the height from the top of the upper beam to the top surface of the water outlet box culvert is H4=0.1H, and in the first composite beam and the second composite beam, the distance between the upper beam and the lower beam is H5 =0.1H,

The four composite beam sections in the first composite beam, from left to right, are the first composite beam section, the second composite beam section, the third composite beam section and the fourth composite beam section, which are located in the partition wall G1, At the position of L11=0.04L upstream of the head of the wall G3, the partition wall G5 and the partition wall G7, the distance L12=0.151L between the second composite beam and the outlet section of the water outlet box culvert.

L=24.8m, W=3m, H=3m, θ=72.5°, Ω=2.4°, W1=6.54m, L1=9.24m, α=27.1°, W2=2.3m, L2=3.43m, β= 18.6°, W3=2.32m, L3=10.25m, γ=8.8°, R=5m, L4=3m, ζ=6°, W4=3.7m, H1=3.3m, D1=0.3m, L5=2.25m , W5=1.41m, W6=1.71m, D2=0.3m, H2=0.75m, L6=1.2m, L7=2.55m, L8=1.35m, L9=1.2m, L10=5.89m, D3=0.6m , H3=0.6m, H4=0.3m, H5=0.3m, L11=1m, L12=3.75m.

In step 7, V _u is used to represent the axial flow velocity uniformity of the outlet section of the water tank and culvert, then the specific calculation formula is:

In the formula: V _a indicates the average axial flow velocity of the outlet section of the water tank culvert, V _ai indicates the axial flow velocity of the i-th measuring point on the outlet section of the water tank culvert, and m indicates the number of measuring points arranged on the outlet section of the water tank culvert.

The short diversion pier, the bottom sill, the first composite beam and the second composite beam are all reinforced concrete structures.

The present invention has the following beneficial effects:

1. The present invention adopts the multiple rectification measures of setting short diversion piers, bottom sills and two composite beams in the multi-hole diffusion shunt flow outlet tank culvert of the urban drainage pump station. The water flow of the two holes is adjusted respectively, so that the water flow entering the diffusion section on both sides is divided into two branches with roughly similar flow rates on the left and right, which provides a basis for the uniformity of the outflow from each hole at the outlet. The outward flow and the horizontal distribution of the homogenized water flow to a certain extent, the two composite beams further rectify the preliminary diffused water flow in the vertical and horizontal directions in the diffusion section and the outlet section respectively, which play a certain role in the horizontal distribution of the homogenized water flow. It can achieve the homogenization effect on the distribution of the effluent flow rate of the porous diffusion and diverted water tank culverts, and help to improve the water flow state of the porous diffusion and diverted outflow water tank culverts. Uniformity has important engineering application value.

2. The multiple rectification measures provided by the present invention are simple in structure, easy to construct, and have remarkable rectification effect, and are suitable for popularization and application in the design and reconstruction of urban drainage pumping station projects with porous diffusion and split-flow outflow tank culverts.

Description of drawings

FIG. 1 shows a schematic plan view of the present invention to ensure the porous diffusion and diversion of water tank culverts of urban drainage pumping stations.

Fig. 2 shows a schematic diagram of plane dimensioning of a water tank culvert for ensuring the porous diffusion and diverting outflow of an urban flood drainage pump station according to the present invention.

Figure 3 shows a schematic diagram of the longitudinal cross-sectional structure of a water tank culvert that guarantees the porous diffusion and shunting of an urban flood drainage pump station according to the present invention.

Figure 4 shows the comparative analysis diagram of the flow velocity uniformity at the outlet of the water box and culvert before and after rectification.

Including:

1. Outlet culvert; 2. Outside river; 3. Outlet well;

4. Diversion short pier; 4-1. The first diversion short pier; 4-2. The second diversion short pier;

5. Bottom ridge; 5-1. The first bottom ridge; 5-2. The second bottom ridge; 5-3. The third bottom ridge; 5-4. The fourth bottom ridge;

6. The first composite beam;

6-1. The first section of the composite beam; 6-2. The second section of the composite beam; 6-3. The third section of the composite beam; 6-4. The fourth section of the composite beam; 7. The second combination beam.

Detailed ways

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

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left side", "right side", "upper", "lower part", etc. are based on the orientation or positional relationship shown in the accompanying drawings, only For the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, "first", "second", etc. importance, and therefore should not be construed as a limitation to the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.

A method for ensuring uniform outflow from a water tank culvert by porous diffusion of an urban drainage pump station, comprising the following steps.

Step 1. Lay out the outlet box culvert with porous diffusion and split flow.

As shown in Figures 1 to 3, the inlet of the outlet box culvert 1 is connected with the outlet well 3 of the urban drainage pump station, and the outlet of the outlet box culvert is connected with the external river channel 2.

The total length of the outlet box culvert is preferably L=24.8m, and the outlet box culvert, along the mainstream direction, includes an inlet section, a diffusion section and an outlet section in turn. The diffusion angle of the diffusion section is preferably θ=72.5°, and the outlet inclination angle of the outlet section (ie the angle between the outlet section and the vertical plane) is preferably Ω=2.4°.

There are n-1 partition walls from left to right in the above-mentioned water outlet tank, which are partition wall G1, partition wall G2, partition wall G3, ..., partition wall G(n-1); among them, n =4k, k is a natural number, preferably k=2 or 3.

In the present application, preferably n=8, then there are 7 partition walls arranged in order from left to right in the outlet tank, namely partition wall G1, partition wall G2, partition wall G3, . . . , partition wall G7.

The above-mentioned partition wall G4 is located on the center line of the outlet box culvert, and divides the outlet box culvert into a left hole and a right hole. The width of the left hole and the right hole is preferably W=3m, and the height is preferably H=3m.

The above-mentioned partition walls G1 and G7 are symmetrical about the center line of the outlet box culvert, and the included angle between the partition wall G1 in the diffusion section and the center line of the outlet box culvert is α=0.374θ, more preferably α=27.1°; The distance between the center line of the water tank culvert is W1=2.18W, more preferably W1=6.54m; the distance between the head of the partition wall G1 and the inlet of the water tank culvert is L1=0.372L, more preferably L1=9.24m.

The above-mentioned partition walls G2 and G6 are respectively symmetrical about the center line of the outlet box culvert in the inclined section of the partition wall, and the distance between the head of the partition wall G2 and the center line of the outlet box culvert is W2=0.767W, more preferably W2=2.3m; The distance between the head of the water outlet box culvert and the inlet of the outlet box culvert is L2=0.138L, more preferably L2=3.43m; the angle between the partition wall G2 in the diffusion section and the center line of the outlet box culvert is β=0.257θ, more preferably β=18.6°.

The above-mentioned partition walls G3 and G5 are respectively symmetrical about the center line of the outlet box culvert in the inclined section of the partition wall, and the distance between the head of the partition wall G3 and the center line of the outlet box culvert is W3=0.774W, more preferably W3=2.32m; The distance between the head of the water outlet box culvert and the inlet of the outlet box culvert is L3=0.414L, more preferably L3=10.25m; the angle γ=0.12θ between the partition wall G3 and the center line of the outlet box culvert in the diffusion section is further preferably γ=8.8°.

The bottom of the diffuser section of the outlet box culvert is provided with a slope, which slopes downward along the main flow direction. The horizontal length of the slope is preferably L4=0.121L, more preferably L4=3m; the angle between the slope and the horizontal direction is ζ=0.083θ , more preferably ζ=6°.

Each partition wall includes inclined sections, transition sections and horizontal sections.

The above-mentioned horizontal sections are evenly arranged at the outlet section of the outlet box culvert, so that the width of the single hole at the outlet of the outlet box culvert is W4=1.23W, more preferably W4=3.7m; the height of the single hole H1=H+L4*tanζ, it is further preferable is H1=3.3m.

The inclined section of each partition wall is located in the diffusion section of the water outlet box culvert, and the transition section is used to connect the inclined section and the horizontal section; the transition section is an arc with a radius of preferably R=1.67W, more preferably R=5m.

The setting of n-1 (7) partition walls makes the outlet box and culvert show n-hole (8-hole) diffusion and shunting along the main flow direction.

Step 2. Forming two-hole water flow: The water flow from the outlet well of the urban drainage pump station flows in from the inlet of the outlet box culvert, and is separated by the partition wall G(n/2)=G4 located on the central axis, forming two flows with the same left and right flow. Hole water flow; the two holes water flow are the left hole water flow and the right hole water flow respectively.

Step 3. Form four-hole water flow: set a short diversion pier 4 with a semicircular head at the upstream end of the partition wall G(n/4)=G4 and the partition wall G(3n/4)=G6; the left hole Under the action of the partition wall G(n/4)=G4 and the corresponding short diversion piers, the water flow forms two uniform water flows with the same flow, which are the first water flow in the left hole and the second water flow in the left hole; the water flow in the right hole is in the partition wall. Under the action of G(3n/4)=G6 and the corresponding short diversion piers, two uniform water flows with the same flow rate are formed, which are the first water flow in the right hole and the second water flow in the right hole.

The above-mentioned short diversion pier is preferably a reinforced concrete structure, the top and bottom of which are respectively connected with the top surface and the bottom surface of the outlet box culvert, and the width of the short diversion pier is D1=0.10W, more preferably D1=0.3m; The length of the pier is L5=0.091L, more preferably L5=2.25m; the short diversion pier at the upstream end of the partition wall G2 (that is, the first short diversion pier 4-1) and the center line of the outlet box culvert The angle δ=0.10～ 0.21θ, more preferably δ=15.4°; the angle between the short diversion pier at the upstream end of the partition wall G6 (that is, the second short diversion pier 4-2) and the center line of the outlet box culvert is ε=0.10～0.21θ, which is further preferably is ε=7.5°, if the included angles δ and ε are too large, the flow rate of the two channels inside the four holes will be too small, and if the included angles δ and ε are too small, the flow rates of the two channels outside the four holes will be too small, resulting in uneven flow distribution. The distance between the head of the short diversion pier at the upstream end of the partition wall G2 and the partition wall G4 is W5=0.4～0.6W, more preferably W5=1.41m,; the head of the short diversion pier at the upstream end of the partition wall G6 and the partition wall G4 The pitch W6=0.4 to 0.6W, more preferably W6=1.71m. If the spacing W5 and W6 are too small or too large, it will cause uneven shunting.

Step 4. Horizontal homogenization of the four-hole water flow: on the side of the partition wall G(n/4)=G2, both sides of the partition wall G(n/2)=G4, and the partition wall G(3n/4) all located upstream of the slope On the side of =G6, a bottom sill 5 is arranged each;

The bottom sill on the side of the partition wall G2 located upstream of the slope is the first bottom sill 5-1, and the bottom sills on both sides of the partition wall G4 upstream of the slope are the second bottom sill 5-2 and the third bottom sill from left to right. The sill 5-3, the sill on the side of the partition wall G6 upstream of the slope is the fourth sill 5-4. Each sill is preferably a reinforced concrete structure.

The widths of the above-mentioned four bottom sills are all D2=0.1W, more preferably D2=0.3m; the connecting lines of the four bottom sills are formed in the shape of ")" shape, the first bottom sill 5-1 and the fourth bottom sill 5 -4 Symmetrically arranged along the center line of the outlet tank culvert.

The first bottom sill 5-1 is perpendicular to the partition wall G2, and the length is L6=0.4W, more preferably L6=1.2m; the intersection of the first bottom sill 5-1 and the partition wall G2 to the head of the partition wall G2 The distance L7=0.103L, more preferably L7=2.55m.

The second bottom sill 5-2 and the third bottom sill 5-3 are respectively perpendicular to the partition wall G4, and the length of the second bottom sill 5-2 is L8=0.4-0.45W, more preferably L8=1.35m; The length of the sill 5-3 is L9=0.4~0.45W, more preferably L9=1.2m. If the length of the bottom sill is too small, it will not be able to play an obvious outward sloping effect and a certain effect of homogenizing the horizontal distribution of water flow. It will lead to excessive local hydraulic loss.

The distance between the intersection point A of the bottom sills on both sides of the partition wall G4 and the inlet of the outlet box culvert is L10=0.238L, more preferably L10=5.89m; the heights of all the bottom sills are H2=0.25H, more preferably H2=0.75m.

Step 5. Vertical and horizontal rectification of the four-hole water flow: on the side of the partition wall G(n/4)=G2, both sides of the partition wall G(n/2)=G4, and the partition wall G, both located upstream of the bottom sill and the slope (3n/4)=G6 side, a composite beam section is arranged on each side, and four composite beam sections constitute the first composite beam 6; the setting of the first composite beam can make the water flow into the upstream and slope of the remaining partition walls The vertical and horizontal rectification is carried out, which plays the role of homogenizing the lateral distribution of the water flow and pressing down the main flow.

The four composite beam sections in the first composite beam are preferably reinforced concrete structures, and from left to right are the first composite beam section 6-1, the second composite beam section 6-2, and the third composite beam section 6. -3 and the fourth composite beam section 6-4 are respectively located at L11=0.04L upstream of the head of the partition wall G1, partition wall G3, partition wall G5 and partition wall G7, more preferably L11=1m; The distance between the composite beam and the outlet section of the water box culvert is L12=0.151L, more preferably L12=3.75m.

Step 6. Vertical and horizontal rectification of the water outlet: After the four-hole water flow completed by the rectification in Step 5, after passing through the remaining partition walls and the slope in turn, is rectified vertically and horizontally by the second beam, and then enters the outlet of the water outlet box culvert section; wherein the second beam is perpendicular to the horizontal section of the partition wall.

The above-mentioned second composite beam is preferably a reinforced concrete structure.

As shown in Figure 3, the first composite beam and the second composite beam are preferably the upper and lower beams that are parallel to each other; the first composite beam is symmetrically arranged along the center line of the water outlet box culvert The widths of the first composite beam and the second composite beam are both D3=0.2W, more preferably D3=0.6m.

In the above-mentioned first composite beam and the second composite beam, the height of the upper beam is H3=0.2H, more preferably H3=0.6m; in the first composite beam and the second composite beam, the distance from the top of the upper beam The height of the top surface of the water outlet box culvert is H4=0.1H, more preferably H4=0.3m; in the first composite beam and the second composite beam, the spacing between the upper beam and the lower beam is H5=0.1H, further Preferably H5=0.3m.

Step 7. Homogenize the flow rate: After the effluent in step 6 is rectified vertically and horizontally, under the action of n-1 horizontal sections of partition walls, an n-hole effluent flow state with uniform flow rate distribution is formed.

As shown in Figure 4, using the method of experimental simulation, under the condition of different water levels in the outer river, the comparison and analysis of the porous diffusion shunt flow before and after the improvement of the multiple rectification measures of the above-mentioned embodiment of the present invention is used. degree situation. The closer the value of V _u is to 100%, the more uniform the axial velocity distribution of the water flow at the outlet of the water box and culvert is. The calculation formula is:

In the formula: V _a indicates the average axial flow velocity of the outlet section of the water tank culvert, V _ai indicates the axial flow velocity of the i-th measuring point on the outlet section of the water tank culvert, and m indicates the number of measuring points arranged on the outlet section of the water tank culvert.

According to Fig. 4, it can be seen that the uniformity V _u value of the cross-sectional flow velocity at the outlet of the culvert of the porous diffusion shunt outlet tank after rectification by the present invention increases significantly, reflecting that the multiple rectification measures proposed by the present invention can significantly improve the porous diffusion shunt outlet water tank. The uniformity of the outflow from the culvert helps to ensure the stable operation of the water outlet system of the urban drainage pumping station and to meet the navigation requirements in the connecting river.

The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above-mentioned embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention. These equivalent transformations All belong to the protection scope of the present invention.

Claims (9)

1. The utility model provides a method for guaranteeing that city drainage pumping station porous diffusion divides to flow out water box culvert and outflows evenly which characterized in that: the method comprises the following steps:

Step 1, laying a porous diffusion shunting type water outlet box culvert: communicating an inlet of the water outlet box culvert with a water outlet well of an urban drainage pumping station, and connecting an outlet of the water outlet box culvert with an external river channel; wherein n-1 partition walls are sequentially distributed in the water outlet box culvert from left to right, namely a partition wall G1, a partition wall G2, partition walls G3, … … and a partition wall G (n-1); wherein n is 4k, and k is a natural number; each partition wall comprises an inclined section, a transition section and a horizontal section; wherein, the horizontal sections are uniformly distributed at the outlet section of the water outlet box culvert at equal intervals; the inclined section of each partition wall is positioned in the diffusion section of the water outlet box culvert, and the transition section is used for connecting the inclined section and the horizontal section; the arrangement of n-1 partition walls ensures that the water outlet box culvert is in an n-hole diffusion shunting type along the main flow direction; meanwhile, a slope is arranged in the middle of the diffusion section of the water outlet box culvert;

step 2, forming two-hole water flow: the water flow of the water outlet well of the urban drainage pumping station flows in from the inlet of the water outlet box culvert and is separated by a partition wall G (n/2) positioned on the central axis, so that two-hole water flow with the same left and right flow is formed; the two-hole water flow is respectively a left-hole water flow and a right-hole water flow;

step 3, forming four-hole water flow: the upstream ends of the partition wall G (n/4) and the partition wall G (3n/4) are respectively provided with a guide short pier in a semi-circular head shape; the left hole water flow forms two uniform water flows with consistent flow under the action of the partition wall G (n/4) and the corresponding diversion short pier, and the two uniform water flows are respectively a left hole water flow I and a left hole water flow II; the right hole water flow forms two uniform water flows with consistent flow under the action of the partition wall G (3n/4) and the corresponding diversion short pier, and the two uniform water flows are respectively a right hole one water flow and a right hole two water flow;

Step 4, transversely homogenizing the four-hole water flow: respectively arranging one sill at one side of a partition wall G (n/4), two sides of the partition wall G (n/2) and one side of a partition wall G (3n/4) which are positioned at the upstream of the slope; the four-hole water flow has the functions of outward flow-picking and water flow transverse distribution homogenization;

step 5, rectifying the four-hole water flow vertically and horizontally: respectively arranging a section of combined beam section at one side of a partition wall G (n/4), two sides of the partition wall G (n/2) and one side of a partition wall G (3n/4) which are positioned at the upper streams of the sill and the slope, wherein the four sections of combined beam sections form a first combined beam; the arrangement of the first combined beam can rectify water flow entering the upstream and the slope of the residual partition walls in the vertical and horizontal directions, so as to homogenize the transverse distribution of the water flow and press down the main flow;

and 6, effluent vertical and horizontal rectification: step 5, after the rectified four-hole water flow sequentially passes through the remaining partition walls for separation and slopes, the four-hole water flow is rectified in the vertical and horizontal directions by a second combined beam and then enters an outlet section of the water outlet box culvert; wherein, the second composite beam is vertical to the horizontal section of the partition wall;

step 7, homogenizing the flow rate: and 6, forming an n-hole effluent flow state with uniform flow velocity distribution by the effluent entering the outlet section of the effluent box culvert under the action of n-1 partition horizontal sections.

2. The method for ensuring the uniform culvert outflow of the urban drainage pumping station by the porous diffusion and flow distribution water tank according to claim 1, characterized in that: n is 8, 7 partition walls are sequentially distributed in the water outlet box culvert from left to right, namely a partition wall G1, a partition wall G2, partition walls G3, … … and a partition wall G7; wherein, the partition wall G (n/2) is a partition wall G4, and the partition wall G (n/4) and the partition wall G (3n/4) are a partition wall G2 and a partition wall G6 respectively; partition wall G4 is located on the center line of the water outlet box culvert, and partition walls G1 and G7, partition walls G2 and G6, and partition walls G3 and G5 are respectively symmetrical about the center line of the water outlet box culvert in the inclined sections of the partition walls.

3. The method for ensuring the uniform culvert outflow of the urban drainage pumping station by the porous diffusion and flow distribution water tank according to claim 2, characterized in that: the sizes of the water outlet box culvert in the step 1 are respectively as follows: the length is L, the diffusion angle is theta, and the outlet inclination angle is omega; in the step 2, the left hole and the right hole separated by the partition wall G4 are both W in width and H in height; the distance W1 between the head of the partition wall G1 and the center line of the water box culvert is 2.18W, the distance L1 between the head of the partition wall G1 and the center line of the water box culvert is 0.372L, the included angle α between the head of the partition wall G1 and the center line of the water box culvert in the diffusion section is 0.374 θ, the distance W2 between the head of the partition wall G2 and the center line of the water box culvert is 0.767W, the distance L2 between the head of the partition wall G2 and the center line of the water box culvert is 0.138L, the included angle β between the head of the partition wall G2 and the center line of the water box culvert in the diffusion section is 0.257 θ, the distance W3 between the head of the partition wall G3 and the center line of the water box culvert is 0.774w, the distance L3 between the head of the partition wall G3 and the center line of the water box culvert is 0.414L, and the included angle γ between the partition wall G3 and the center line of the diffusion section of the water box culvert is 0.12 θ; the transition section in each partition wall is an arc with the radius R being 1.67W; in step 1, the slope is provided with the bottom of the diffuser section, the slope inclines downwards along the main flow direction, the horizontal length L4 of the slope is 0.121L, the included angle between the slope and the horizontal direction is zeta 0.083 theta, the single-hole width W4 of the water outlet box culvert outlet is 1.23W, and the single-hole height H1 is H + L4 tan zeta.

4. The method for ensuring the uniform outflow of the sewage from the water tank by the porous diffusion and flow distribution of the urban drainage pumping station according to claim 3, wherein the method comprises the following steps: in step 3, the top and the bottom of the short diversion pier are respectively connected with the top surface and the bottom surface of the water outlet box culvert, the width D1 of the short diversion pier is 0.10W, the length L5 of the short diversion pier is 0.091L, the included angle delta between the short diversion pier at the upstream end of the partition wall G2 and the center line of the water outlet box culvert is 0.10-0.21 theta, and the included angle epsilon between the short diversion pier at the upstream end of the partition wall G6 and the center line of the water outlet box culvert is 0.10-0.21 theta; the distance W5 between the flow guide short pier head at the upstream end of the partition G2 and the partition G4 is 0.4-0.6W, and the distance W6 between the flow guide short pier head at the upstream end of the partition G6 and the partition G4 is 0.4-0.6W.

5. The method for ensuring the uniform culvert outflow of the urban drainage pumping station by the porous diffusion and flow distribution water tank according to claim 4, wherein the method comprises the following steps: in step 4, the width D2 of the sill is 0.1W, the sill on one side of the partition wall G2, the sills on both sides of the partition wall G4, the sill on one side of the partition wall G6, and the connecting lines of the four sills are formed into ")" shape; the bottom sills on one side of the partition wall G2 and the bottom sills on one side of the partition wall G6 are symmetrically arranged along the center line of the water outlet box culvert; one sill of one side of the partition wall G2 is perpendicular to the partition wall G2, and the length of the sill is L6 which is 0.4W; the distance L7 from the intersection point of the sill on one side of the partition wall G2 and the partition wall G2 to the head of the partition wall G2 is 0.103L, the sills on the two sides of the partition wall G4 are perpendicular to the partition wall G4, the sill length on the partition wall G4 facing the partition wall G2 is 0.4-0.45W, and the sill length on the partition wall G4 facing the partition wall G6 is 0. 9-0.45W; the distance between the intersection point A of the bottom sills on the two sides of the partition wall G4 and the inlet of the water-out box culvert is L10-0.238L, and the heights of all the bottom sills are H2-0.25H.

6. The method for ensuring the even flowing of the flood-drainage pumping station multi-hole diffusion divided water-drainage culvert according to claim 5, wherein the method comprises the following steps: in the step 5 and the step 6, the first combined beam and the second combined beam are an upper layer cross beam and a lower layer cross beam which are parallel to each other; the first combined beam is symmetrically arranged along the central line of the water outlet box culvert and is vertical to the central line of the water outlet box culvert; the widths of the first combined beam and the second combined beam are D3-0.2W, the heights of the upper beams in the first combined beam and the second combined beam are H3-0.2H, the heights of the tops of the upper beams in the first combined beam and the second combined beam from the top of the water box culvert are H4-0.1H, the distances of the upper beams and the lower beams in the first combined beam and the second combined beam are H5-0.1H, four combined beam sections in the first combined beam are respectively a first combined beam section, a second combined beam section, a third combined beam section and a fourth combined beam section from left to right, L11 upstream of the heads of G1, G3, G5 and a partition wall G7 is 0.04L, and the distance of the cross section of the second combined beam from the water box outlet is L12-0.151L.

7. The method for ensuring the uniform culvert outflow of the urban drainage pumping station by the porous diffusion and flow distribution water tank according to claim 6, wherein the method comprises the following steps: l24.8 m, W3 m, H3 m, θ 72.5 °, Ω 2.4 °, W1 6.54m, L1 9.24m, α 27.1 °, W2 2.3m, L2 3.43m, β 18.6 °, W3.32 m, L3 10.25m, γ 8.8 °, R4975 m, L4, ζ 6 °, W4.7 m, H1, D1, 0.3m, L5, L2.25 m, W5, W3641 m, W6 m, D46, D384, H3, L3, H3, m 3, L3, m 3, m 3, m 3, H8, L4974, H8.8, R4974, H8, H5 m, L38, H8, H6, H8, H6, H8, H8.8, 8, R6, 8, 6, 8, 6, k 3, k, W6858, W3, W6, W46, W6, W46, k 3, W46, k, D46, k 1, k 3, k 1, k 3, k 3, k 1, k 6, k 2, k 3, k 2, k 2, k 2, k 6, k 2, k 2, k 6, k 2 k, k 2, k 2, k 2, k 2, k 2 k, k 2, k 2 k, k 2 k, k 2, k.

8. The method for ensuring the uniform culvert outflow of the urban drainage pumping station by the porous diffusion and flow distribution water tank according to claim 1, characterized in that: in step 7, V is used _u The axial flow velocity uniformity of the cross section of the outlet of the water box culvert is shown, and the specific calculation formula is as follows:

in the formula: v _a Indicating the average axial flow velocity, V, of the cross section of the outlet of the water box culvert _ai And (5) indicating the axial flow velocity of the ith measuring point of the outlet section of the water box culvert, and indicating the number of measuring points arranged on the outlet section of the water box culvert by m.

9. The method for ensuring the uniform culvert outflow of the urban drainage pumping station by the porous diffusion and flow distribution water tank according to claim 1, characterized in that: the diversion short pier, the bottom sill, the first combined beam and the second combined beam are all of reinforced concrete structures.

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