CN114032798B - Method for ensuring even outflow of water tank culvert for distributing and distributing porous water in urban drainage pumping station - Google Patents
Method for ensuring even outflow of water tank culvert for distributing and distributing porous water in urban drainage pumping station Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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Abstract
The invention discloses a method for ensuring even outflow of a porous diffusion shunt water box culvert of an urban drainage pumping station, which is characterized in that a semicircular head type flow guide short pier, a bottom sill and two combined beams are arranged in the porous diffusion shunt water box culvert of the urban drainage pumping station, the flow guide short pier respectively adjusts two holes of water flow at the back of an inlet of the box culvert so that the inflow water flow is further divided into two strands with approximately similar left and right flow rates, the bottom sill has the functions of outward flow raising and transverse flow distribution of homogenized water flow for the water flow in the water box culvert, the two combined beams respectively rectify the water flow in the vertical direction and the horizontal direction at an overflow channel and a section close to an outlet, homogenize the transverse flow distribution and press the main flow, the homogenization effect of the flow velocity distribution of the porous diffusion shunt water box culvert is realized by multiple rectification measures, the flow state of the outlet flow velocity distribution of the box culvert is realized, and the homogenization of the flow velocity distribution of the porous diffusion shunt water box culvert is favorable for improving the outflow state of the porous diffusion shunt water box culvert, the method has important engineering application value for guaranteeing the outflow uniformity of the urban drainage pumping station.
Description
Technical Field
The invention belongs to the technical field of municipal drainage pumping station engineering, and particularly relates to a method for ensuring that the drainage of urban drainage pumping stations is uniform in drainage by distributing water from a water tank in a porous diffusion way.
Background
In recent years, urban rainstorm and waterlogging have become a common problem in many countries and regions of the world due to the influence of various factors such as global climate change and socioeconomic development. Under the condition, the urban drainage pumping station which is usually used for preventing and controlling urban waterlogging and removing the waterlogging in urban low-lying areas and waterlogging drainage pipelines becomes one of important contents of current urban infrastructure.
The water outlet box culvert is a water outlet building commonly used by urban drainage pumping stations, is often limited by aspects such as shortage of urban planning land, terrain conditions, large drainage and drainage water flow, construction conditions and the like, and is designed by adopting a porous diffusion and flow distribution body type so as to reduce the water flow speed at the outlet of the water outlet box culvert. However, in the case of the porous diffusion split-flow type water outlet box culvert, particularly when the diffusion angle is too large, the flow state of the water flow is disturbed, the water flow is difficult to uniformly diffuse, and poor flow states such as main flow centering and backflow vortex are formed. Under this condition, to urban drainage pumping station, except great hydraulic loss and the local silt siltation problem in the box culvert, still can have the uneven circumstances of box culvert export velocity of flow distribution, seriously influenced urban drainage pumping station's the safety and stability operation and the navigation safety in the linkage river course.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a method for ensuring the uniform outflow of a porous diffusion shunt water box culvert of an urban drainage pumping station.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for guaranteeing even outflow of a multi-hole diffusion divided water tank culvert of an urban drainage pumping station comprises the following steps.
And 6, effluent vertical and horizontal rectification: step 5, after the four-hole water flow which is rectified sequentially passes through the remaining partition walls and slopes, the four-hole water flow enters an outlet section of the water outlet box culvert after being rectified vertically and horizontally by the second cross beam; wherein, the second crossbeam is perpendicular with the horizontal section of partition wall.
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.
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.
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, 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.
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 sill at one side of the partition wall G2 and the sill at 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 bottom sill at one side of the partition wall G2 and the partition wall G2 to the head of the partition wall G2 is 0.103L, the bottom sills at two sides of the partition wall G4 are perpendicular to the partition wall G4, the length of the bottom sill facing the partition wall G2 on the partition wall G4 is 0. 8-0.4-0.45W, and the length of the bottom sill facing the partition wall G6 on the partition wall G4 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.
In the step 6 and the step 7, 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 width of the first combined beam and the width of the second combined beam are both D3 ═ 0.2W, the height of the upper beam in the first combined beam and the second combined beam is H3 ═ 0.2H, the height of the top of the upper beam from the top surface of the water box culvert in the first combined beam and the second combined beam is H4 ═ 0.1H, the distance between the upper beam and the lower beam in the first combined beam and the second combined beam is H5 ═ 0.1H,
the 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, the first combined beam section, the second combined beam section, the third combined beam section and the fourth combined beam section are respectively positioned at the positions of 0.04L of L11 at the upstream of the heads of the partition wall G1, the partition wall G3, the partition wall G5 and the partition wall G7, and the distance L12 between the second combined beam and the outlet section of the water box culvert is 0.151L.
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 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 indicating the axial flow velocity of the ith measuring point of the outlet section of the water tank culvert, wherein m indicates the number of the measuring points distributed on the outlet section of the water tank culvert.
The diversion short pier, the bottom sill, the first combined beam and the second combined beam are all of reinforced concrete structures.
The invention has the following beneficial effects:
1. the invention provides a multi-rectification measure by arranging a diversion short pier, a bottom sill and two combined beams in a multi-hole diffusion split-flow type water outlet box culvert of an urban drainage pumping station, wherein the semi-circular diversion short pier is used for respectively adjusting two hole water flows at the rear of an inlet of the box culvert, so that the water flow entering two diffusion sections at two sides is divided into two strands with approximately similar left and right flows, a foundation is provided for the uniformity of the outlet water flow of each hole, the bottom sill has obvious outward-cantilever flow function and certain homogenized water flow transverse distribution function on the multi-hole diffusion split-flow type water outlet box culvert, the two combined beams further rectify the primarily diffused water flow in the diffusion section and the outlet section in the vertical direction and the horizontal direction respectively, a certain homogenized water flow transverse distribution function and an obvious main flow pressing effect are achieved, the homogenization effect of the water flow velocity distribution of the multi-hole diffusion split-flow type water outlet box culvert is realized, and the improvement of the water flow state of the multi-hole diffusion split-flow type water outlet box culvert is facilitated, the method has important engineering application value for guaranteeing the outflow uniformity of the urban drainage pumping station.
2. The multiple reforming flow measures provided by the invention have the advantages of simple structure, easiness in construction and manufacture and remarkable rectification effect, and are suitable for being popularized and used in the design and transformation of urban drainage pumping station engineering with porous diffusion flow-dividing type water outlet box culverts.
Drawings
Fig. 1 shows a schematic plane structure diagram of the box culvert for guaranteeing the multi-hole diffusion and diversion of the urban drainage pumping station.
Fig. 2 shows a schematic plan dimension marking diagram for guaranteeing a multi-hole diffusion diversion water box culvert of an urban drainage pumping station.
Fig. 3 shows a schematic diagram of a longitudinal section structure of a box culvert for guaranteeing the multi-hole diffusion and diversion of the urban drainage pumping station.
FIG. 4 shows a comparative analysis chart of the flow velocity uniformity of the outlet water flow of the outlet box culvert before rectification and after rectification.
Among them are:
1. discharging a water box culvert; 2. an outside river channel; 3. a water outlet well;
4. short flow guide piers; 4-1, a first flow guide short pier; 4-2, second diversion short piers;
5. a sill; 5-1, a first sill; 5-2, a second sill; 5-3, a third sill; 5-4, a fourth sill;
6. a first composite beam;
6-1, a first section of combined beam section; 6-2, a second section of combined beam section; 6-3, a third section of combined beam section; 6-4, a fourth section of combined beam section; 7. and a second composite beam.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific preferred embodiments.
In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper part", "lower part", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and that "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions used in the present example are only for illustrating the technical solution and do not limit the protection scope of the present invention.
A method for guaranteeing even outflow of a porous diffusion and flow-division water tank culvert of an urban drainage pumping station comprises the following steps.
As shown in fig. 1 to 3, an inlet of the water outlet box culvert 1 is communicated with a water outlet well 3 of the urban drainage pumping station, and an outlet of the water outlet box culvert is connected with an external river channel 2.
The total length of the water outlet box culvert is preferably 24.8m, and the water outlet box culvert sequentially comprises an inlet section, a diffusion section and an outlet section along the main flow direction. The diffusion angle of the diffuser section is preferably 72.5 °, and the outlet inclination angle of the outlet section (i.e. the angle between the outlet cross-section and the vertical plane)) is preferably 2.4 °.
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, k is a natural number, and k is preferably 2 or 3.
In the present application, preferably, when n is 8, 7 partition walls, namely, a partition wall G1, a partition wall G2, a partition wall G3, a partition wall … …, and a partition wall G7, are arranged in the water outlet box culvert from left to right.
The partition wall G4 is located on the central line of the culvert and divides the culvert into left and right holes, and the left and right holes preferably have a width W of 3m and a height H of 3 m.
The partition walls G1 and G7 are symmetrical with respect to the center line of the culvert, and an included angle α between the diffusion section of the partition wall G1 and the center line of the culvert is 0.374 θ, and more preferably, α is 27.1 °; the distance W1 between the head of the partition wall G1 and the center line of the culvert is 2.18W, and more preferably W1 is 6.54 m; the distance L1 between the head of the partition wall G1 and the inlet of the outlet box culvert is 0.372L, and more preferably L1 is 9.24 m.
The partition walls G2 and G6 are respectively symmetrical with respect to the center line of the outlet box culvert at the inclined section of the partition wall, and the distance W2 between the head of the partition wall G2 and the center line of the outlet box culvert is 0.767W, and more preferably W2 is 2.3 m; the distance L2 between the head of the partition wall G2 and the inlet of the water box culvert is 0.138L, and more preferably L2 is 3.43 m; the angle β between the diffuser segment and the centerline of the outlet box culvert of the partition wall G2 is 0.257 θ, and more preferably 18.6 °.
The partition walls G3 and G5 are respectively symmetrical with respect to the center line of the water-out box culvert at the inclined section of the partition wall, and the distance W3 between the head of the partition wall G3 and the center line of the water-out box culvert is 0.774W, and more preferably, the distance W3 is 2.32 m; the distance L3 between the head of the partition wall G3 and the inlet of the water outlet box culvert is 0.414L, and more preferably L3 is 10.25 m; the angle γ between the diffuser and the centerline of the box culvert for the partition wall G3 is 0.12 θ, and more preferably 8.8 °.
The bottom in the middle of the diffusion section of the water outlet box culvert is provided with a slope which inclines downwards along the main flow direction, and the horizontal length of the slope is preferably 0.121L (L4), and more preferably 3m (L4); the angle formed by the slope and the horizontal direction is ζ 0.083 θ, and more preferably ζ 6 °.
Each partition wall comprises an inclined section, a transition section and a horizontal section.
The horizontal sections are uniformly distributed at the outlet section of the water outlet box culvert at equal intervals, so that the single-hole width W4 of the outlet of the water outlet box culvert is 1.23W, and more preferably W4 is 3.7 m; the single-pore height H1 ═ H + L4 ═ tan ζ, and more preferably H1 ═ 3.3 m.
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 transition sections are circular arcs each having a radius of preferably 1.67W, and more preferably 5 m.
The arrangement of n-1 (7) partition walls enables the water outlet box culvert to be in an n-hole (8-hole) diffusion shunting type along the main flow direction.
The diversion short piers are preferably of a reinforced concrete structure, the top and the bottom of the diversion short piers are respectively connected with the top surface and the bottom surface of the water outlet box culvert, and the width D1 of the diversion short piers is 0.10W, and more preferably D1 is 0.3 m; the length L5 of the diversion short pier is 0.091L, and more preferably L5 is 2.25 m; an included angle delta between the diversion short pier at the upstream end of the partition wall G2 (namely the first diversion short pier 4-1) and the central line of the water outlet box culvert is 0.10-0.21 theta, and is more preferably 15.4 degrees; an included angle epsilon between the diversion short pier at the upstream end of the partition wall G6 (namely the second diversion short pier 4-2) and the central line of the water box culvert is 0.10-0.21 theta, more preferably, the included angle epsilon is 7.5 degrees, the flow of two flow channels on the inner side of the four holes is too small due to overlarge included angles delta and epsilon, and the flow of two flow channels on the outer side of the four holes is too small due to overlarge included angles delta and epsilon, so that uneven flow distribution is caused; the distance W5 between the head of the short diversion pier at the upstream end of the partition G2 and the partition G4 is 0.4-0.6W, and the distance W5 is preferably 1.41 m; the distance W6 between the head of the short diversion pier at the upstream end of the partition G6 and the partition G4 is 0.4-0.6W, and more preferably W6 is 1.71 m. Too small or too large a separation distance W5 and W6 may result in uneven flow distribution.
The sill on one side of the partition wall G2 at the upstream of the slope is a first sill 5-1, the sills on two sides of the partition wall G4 at the upstream of the slope from left to right are a second sill 5-2 and a third sill 5-3 respectively, and the sill on one side of the partition wall G6 at the upstream of the slope is a fourth sill 5-4. Each sill is preferably a reinforced concrete structure.
The widths of the four bottom ridges are all D2 ═ 0.1W, and more preferably D2 ═ 0.3 m; the connecting lines of the four bottom sills are formed into) a shape, and the first bottom sill 5-1 and the fourth bottom sill 5-4 are symmetrically arranged along the central line of the water outlet box culvert.
The first sill 5-1 is perpendicular to the partition wall G2, and has a length L6 ═ 0.4W, more preferably L6 ═ 1.2 m; the distance L7 from the intersection of the first sill 5-1 and the partition wall G2 to the head of the partition wall G2 is 0.103L, and more preferably, L7 is 2.55 m.
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 0.4-0.45W (L8), and more preferably 1.35m (L8); the length of the third sill 5-3 is 0.4-0.45W of L9, more preferably 1.2m of L9, and too small a length of the sill will not play a role in obvious outward turbulence and a certain role in transverse distribution of homogenized water flow, and too large a length will result in excessive local hydraulic loss.
The distance between the intersection point a of bottom sills at two sides of the partition wall G4 and the inlet of the water-out box culvert is L10-0.238L, and more preferably L10-5.89 m; the height of all the bottom ridges is H2 ═ 0.25H, and further preferably H2 ═ 0.75 m.
Four combined beam sections in the first combined beam are preferably of a reinforced concrete structure, namely a first combined beam section 6-1, a second combined beam section 6-2, a third combined beam section 6-3 and a fourth combined beam section 6-4 from left to right, and are respectively positioned at the position where the L11 upstream of the head of the partition wall G1, the partition wall G3, the partition wall G5 and the partition wall G7 is 0.04L, and more preferably the position where the L11 is 1 m; the distance L12 between the second composite beam and the outlet section of the outlet box culvert is 0.151L, and more preferably L12 is 3.75 m.
And 6, effluent vertical and horizontal rectification: step 5, after the four-hole water flow which is rectified sequentially passes through the remaining partition walls and slopes, the four-hole water flow enters an outlet section of the water outlet box culvert after being rectified vertically and horizontally by the second cross beam; wherein, the second crossbeam is perpendicular with the horizontal section of partition wall.
The second composite girder is preferably a reinforced concrete structure.
As shown in fig. 3, the first composite girder and the second composite girder are preferably an upper cross beam and a lower 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 width of each of the first composite beam and the second composite beam is D3 ═ 0.2W, and more preferably D3 ═ 0.6 m.
In the first composite girder and the second composite girder, the height of the upper beam is H3-0.2H, and more preferably H3-0.6 m; in the first combined beam and the second combined beam, the height from the top of the upper-layer cross beam to the top surface of the water box culvert is H4-0.1H, and preferably H4-0.3 m; in the first composite girder and the second composite girder, the distance between the upper-layer cross beam and the lower-layer cross beam is H5-0.1H, and more preferably H5-0.3 m.
As shown in fig. 4, the conditions of improving the flow velocity uniformity of the outlet of the porous diffusion split-flow type effluent box culvert before and after the action by adopting the multiple rectification measures of the above embodiment of the present invention are comparatively analyzed under the conditions of different water levels of the inland river by adopting the experimental simulation method. V u The closer the numerical value is to 100%, the more uniform the distribution of the axial velocity of the water flow at the outlet of the water-out box culvert is, the more uniform the calculation formula is:
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.
As can be seen from FIG. 4, the flow velocity uniformity V of the cross section of the outlet of the box culvert rectified by the invention u The value is obviously increased, and the multiple rectification measures provided by the invention can obviously improve the porous diffusion flow-dividing type water outlet tankThe uniformity of the culvert outflow is helpful for ensuring the stable operation of the water outlet system of the urban drainage pumping station and meeting the navigation requirement in the linked river channel.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the 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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