Drop energy dissipation well of drainage box culvert

Abstract

The drop energy dissipation well comprises a well body and an energy dissipation structure, a water inlet and a water outlet which are used for being communicated with the external environment and an inner cavity of the well body are formed in the two sides of the well body respectively, the water inlet is higher than the water outlet, and the water inlet and the water outlet are used for being communicated with a water inlet box culvert and a water outlet box culvert respectively; the energy dissipation structure is arranged in the inner cavity, an energy dissipation channel is formed in the energy dissipation structure, the two ends of the energy dissipation channel communicate with the water inlet and the water outlet correspondingly, the energy dissipation channel comprises a flow guide section communicating with the water inlet and extending obliquely downwards and a flip bucket communicating with the flow guide section, and the energy dissipation structure comprises a baffle ridge located in the flip bucket and arranged close to the water outlet. The flow direction is changed through the flow guide section, water flows down along the flow guide section to enter the follow flip bucket, water jump is formed after the water flow passes through the baffle sill, then the flip bucket is filled with the water flow, the liquid level exists at the bottom of the baffle bucket, flip bucket energy dissipation and surface flow energy dissipation are combined, and high-fall water fall energy dissipation is achieved.

Description

Technical Field

[0001] The utility model relates to the field of water conservancy construction, and particularly relates to a drop energy dissipation well for a drainage culvert box Background Technique

[0002] When there is a large drop in drainage pipelines and culvert boxes, drop wells need to be set. Article 4.5.1 of the "Code for Design of Outdoor Wastewater Engineering" (GB50014-2021) stipulates that when the drop head of the pipeline is 1.0m - 2.0m, a drop well should be set preferably; when the drop head is greater than 2.0m, a drop well must be set. The "Atlas of Drainage Inspection Chambers" (20S515) includes 3 types of drop wells, namely vertical pipe drop wells, vertical trough drop wells, and stepped drop wells. Among them, the vertical pipe drop well is applicable to cast iron pipes with a falling pipe diameter not greater than 200mm and sewage pipes with a drop of 1 - 6m; the vertical trough drop well is applicable to rain and sewage pipes with a falling pipe diameter of 200 - 600mm and a drop of 1 - 4m; the stepped drop well is applicable to rain and sewage pipes with a falling pipe diameter of 700 - 1650mm and a drop of 1 - 2m. The maximum drop of the above three types of drop wells is only 6m, and when the drop is 6m, it only corresponds to cast iron sewage pipes with a diameter not greater than 200mm, which is difficult to meet the needs of the latest development of the drainage pipe network

[0003] The prior art has a relatively clear design and mature technology for the drop wells of drainage pipelines. However, in actual engineering design and application, with the continuous improvement of the urban flood control and drainage standards and the increase in the water conveyance volume of water conservancy projects, the design and application of drainage culvert boxes are becoming more and more widespread. The drainage culvert box has the characteristics of a large water conveyance volume, etc., and the traditional design of the energy dissipation well for drainage pipelines cannot cope with the energy dissipation of large-flow culvert boxes Content of the Utility Model

[0004] Based on the above description, the utility model provides a drop energy dissipation well for a drainage culvert box to solve the problem that the existing design of the energy dissipation well for drainage pipelines cannot cope with the energy dissipation of large-flow culvert boxes

[0005] The technical solution for the utility model to solve the above technical problems is as follows

[0006] A drop energy dissipation well for a drainage culvert box, comprising

[0007] A well body, on both sides of which there are respectively an inlet and a drain outlet for connecting the external environment and its inner cavity. The inlet is higher than the drain outlet, and the inlet and the drain outlet are respectively used to connect the inlet culvert box and the drain culvert box; and

[0008] An energy dissipation structure is provided in the inner cavity. The energy dissipation structure forms an energy dissipation channel, and both ends of the energy dissipation channel are respectively communicated with the water inlet and the drain outlet. The energy dissipation channel includes a diversion section communicated with the water inlet and extending obliquely downward, and a flip bucket communicated with the diversion section. The energy dissipation structure includes a stilling sill located in the flip bucket and close to the drain outlet.

[0009] On the basis of the above technical solution, the present utility model can also be improved as follows:

[0010] Further, the energy dissipation structure includes:

[0011] A chute structure forms a chute with the notch facing upward. The chute includes a first section and a second section connected to each other. The first section extends obliquely downward, and the second section is arc-shaped. The free ends of the first section and the second section are respectively communicated with the water inlet and the drain outlet;

[0012] A guide plate has one end connected to the water inlet and the other end extending obliquely downward and covering the notch of the chute to form the diversion section with the first section;

[0013] The flip bucket is formed in the second section.

[0014] Further, the energy dissipation structure further includes a water baffle. One end of the water baffle is connected to the drain outlet, and the other end extends horizontally above the flip bucket;

[0015] The energy dissipation channel includes the lower end surface of the water baffle.

[0016] Further, the projection of the other end of the water baffle from bottom to top coincides with the lowest position of the second section.

[0017] Further, the height of the first section is the same as the height of the culvert;

[0018] The upper end surface of the second section extends in the horizontal direction.

[0019] Further, the guide plate is arc-shaped, the radius of the arc of the guide plate is the same as the radius corresponding to the arc of the second section, and the angle of the arc of the guide plate is twice the angle of the arc of the second section.

[0020] Further, the shape of the stilling sill is an isosceles right triangle, its hypotenuse is connected to the flip bucket, and one of the right sides extends vertically.

[0021] Further, the number of the energy dissipation structures is at least two, and the two energy dissipation structures are spaced apart along the width direction of the well body;

[0022] The number of the water inlets and the number of the water outlets both correspond to at least two.

[0023] Furthermore, the width of the well body is the same as the widths of the water inlet culvert and the water outlet culvert.

[0024] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0025] The water flow of the water inlet culvert enters from the water inlet, and through the diversion section, the water flows obliquely downward to the flip bucket. The flip bucket picks up the water flow upward to complete the first energy dissipation; the picked-up water flow forms a hydraulic jump after passing through the stilling baffle to complete the second energy dissipation; and the water flow fills the flip bucket to form surface flow energy dissipation in the flow regulating bucket. In this way, the first energy dissipation, the second energy dissipation and the surface flow energy dissipation can be combined to achieve a good energy dissipation effect; the water flow after energy dissipation flows into the water outlet culvert through the water outlet; thus, the energy dissipation efficiency is high, and the energy dissipation problem of the large-flow and large-drop culvert is effectively solved. Description of the Drawings

[0026] Figure 1 It is a top view schematic diagram of a drop energy dissipation well of a drainage culvert provided by an embodiment of the present utility model;

[0027] Figure 2 It is Figure 1 a sectional view along A-A of

[0028] Figure 3 It is Figure 1 a sectional view along B-B of

[0029] Figure 4 It is a flow pattern schematic diagram of a drop energy dissipation well of a drainage culvert provided by an embodiment of the present utility model;

[0030] Figure 5 It is a schematic diagram of the bottom of the chute in an embodiment of the present utility model;

[0031] Figure 6 It is a top view schematic diagram of the connection between a drop energy dissipation well of a drainage culvert and a multi-hole culvert provided by an embodiment of the present utility model.

[0032] In the drawings, the list of components represented by each reference numeral is as follows:

[0033] 1. Well body; 11. Inner cavity; 12. Water inlet; 13. Water outlet; 2. Energy dissipation structure; 21. Energy dissipation channel; 211. Diversion section; 212. Flip bucket; 22. Stilling baffle; 23. Chute structure; 231. Chute; 2311. First section; 2312. Second section; 24. Guide plate; 25. Water retaining plate; 26. Opening; a1. Water inlet culvert; a2. Water outlet culvert. Detailed Embodiments

[0034] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant accompanying drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0036] It can be understood that spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over" etc. can be used herein to describe the relationship of one element or feature shown in the figure with other elements or features. It should be understood that in addition to the orientation shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the drawing is flipped, the element or feature described as "under other elements" or "beneath it" or "under it" will be oriented "above" other elements or features. Therefore, the exemplary terms "under" and "below" can include both the upper and lower orientations. In addition, the device can also include other orientations (such as rotating 90 degrees or other orientations), and the spatial description terms used herein are accordingly interpreted.

[0037] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is an electrical signal or data transfer between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0038] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0039] Referring to Figures 1 to 3 , the present utility model provides a drop energy dissipation well for a drainage culvert a2, comprising:

[0040] A well body 1, wherein a water inlet 12 and a water outlet 13 are respectively provided on both sides of the well body 1 for connecting the external environment with the inner cavity 11 thereof, wherein the water inlet 12 is arranged higher than the water outlet 13, and the water inlet 12 and the water outlet 13 are respectively used for connecting the water inlet culvert a1 and the water outlet culvert a2; and,

[0041] The energy dissipation structure 2 is arranged in the inner cavity 11, and the energy dissipation structure 2 forms an energy dissipation channel 21. The two ends of the energy dissipation channel 21 are respectively connected to the water inlet 12 and the drain outlet 13. The energy dissipation channel 21 includes a guide section 211 connected to the water inlet 12 and extending obliquely downward, and a diversion bucket 212 connected to the diversion section 211. The energy dissipation structure 2 includes a dissipation sill 22 located in the diversion bucket 212 and arranged close to the drain outlet 13.

[0042] The water flow of the water inlet culvert a1 enters from the water inlet 12, passes through the diversion section 211, and makes the water flow obliquely downward to the flow diverter 212. The flow diverter 212 lifts the water flow upward to complete the primary energy dissipation; the lifted water flow forms a water jump after passing through the energy dissipation sill 22, and completes the secondary energy dissipation; and the water flow fills the flow diverter 212, and flow-free energy dissipation is formed in the flow diverter 212, so that the primary energy dissipation, the secondary energy dissipation and the surface flow energy dissipation can be combined to achieve a good energy dissipation effect; the water flow after the energy dissipation flows into the drainage culvert a2 through the drain port 13; in this way, the energy dissipation efficiency is high, and the energy dissipation problem of the culvert with large flow and large drop difference is effectively solved.

[0043] It should be noted that, refer to Figure 2 and Figure 4 The function of the diversion section 211 is to guide the water flow in the water inlet culvert a1 and change the flow direction, so that the water flow flows obliquely downward into the diverting bucket 212; the water flow flowing obliquely downward is lifted up by the diverting bucket 212 and forms a water jump behind the energy dissipation sill 22. The water jump energy dissipation mainly relies on the surface vortex generated by the water jump and the strong turbulence, shearing and mixing between the vortex and the bottom flow to transform the rapid flow into a slow flow. The water flow entering the diverting bucket 212 is lifted up to complete the diverting energy dissipation; the diverting energy dissipation is that the diverting bucket 212 lifts the water flow and then ejects it downward, and eliminates part of the energy through the diffusion, turbulence and aeration of the jet in the air. And the flow-enhancing bucket 212 is filled with water flow, so that there is a liquid level at the bottom of the flow-enhancing bucket 212, so as to form surface flow energy dissipation in the flow-enhancing bucket 212; the surface flow energy dissipation is an energy dissipation method in which the flow-enhancing bucket 212 lifts the incoming water flow to the water surface, diffuses the incoming water flow on the water surface, and swirls at the bottom and on the surface to eliminate residual energy.

[0044] Specifically, refer to Figure 1 , Figure 2 and Figure 4, the energy dissipation structure 2 includes a chute structure 23 and a guide plate 24. The chute structure 23 is formed with a chute 231 with an upward-facing notch. The chute 231 includes a first section 2311 and a second section 2312 that are connected. The first section 2311 extends obliquely downward, and the second section 2312 is arc-shaped. The free ends of the first section 2311 and the second section 2312 are respectively communicated with the water inlet 12 and the drain outlet 13. One end of the guide plate 24 is connected to the water inlet 12, and the other end extends obliquely downward and covers the notch of the chute 231 to form the diversion section 211 with the first section 2311. The flip bucket 212 is formed on the second section 2312.

[0045] In this embodiment, referring to Figure 1 , Figure 3 and Figure 4 , the overall shape of the chute structure 23 is U-shaped. The inclination angle of the guide plate 24 is adapted to the first section 2311, so as to change the flow direction of the water flowing in from the water inlet 12 and ensure subsequent energy dissipation.

[0046] Furthermore, referring to Figure 2 and Figure 4 , the energy dissipation structure 2 further includes a water baffle 25. One end of the water baffle 25 is connected to the drain outlet 13, and the other end extends horizontally above the flip bucket 212. The energy dissipation channel 21 includes the lower end surface of the water baffle 25.

[0047] In this embodiment, the water flow that has dissipated energy through the flip bucket and the stilling basin 22 can also collide with the water baffle 25 to further dissipate energy. And the water baffle 25 enables the energy-dissipated water flow to be discharged into the drain culvert a2 through the drain outlet 13 as soon as possible. In this way, the energy dissipation time is reduced and the energy dissipation efficiency is improved.

[0048] Even further, in this embodiment, referring to Figure 4 , the projection of the other end of the water baffle 25 from bottom to top coincides with the lowest position of the second section 2312. In this way, without affecting the energy dissipation effect of the flip bucket 212, the maximum amount of water flow can be intercepted by the water baffle 25 and flow out from the drain outlet 13 into the drain culvert a2.

[0049] In this embodiment, the height of the first section 2311 is the same as the height of the culvert. The upper end surface of the second section 2312 extends horizontally.

[0050] It should be noted that, in this embodiment, continue to refer to Figure 4, the guiding plate 24 and the water baffle 25 respectively cover both ends of the notch of the chute 231 to form an opening 26 in the middle of the notch. The opening 26 communicates with the inner cavity 11 and is used for exhausting air. Specifically, the gas discharges from the opening 26 to the inner cavity 11 and then from the exhaust hole of the manhole cover installed on the well body 1.

[0051] In this embodiment, referring to Figure 4 and Figure 5 , the guiding plate 24 is arc-shaped, so as to better guide the incoming water flow; the radius of the guiding plate 24 corresponds to the arc of the second section 2312, and the angle of the arc of the guiding plate 24 is twice the angle of the arc of the second section 2312.

[0052] In this embodiment, referring to Figure 2 , Figure 4 and Figure 5 , the shape of the stilling basin 22 is an isosceles right triangle, its hypotenuse is connected to the flip bucket 212, and one of its right sides extends vertically. Thus, the water flow passing through the stilling basin 22 can form a hydraulic jump.

[0053] In this embodiment, referring to Figure 2 and Figure 6 , the inlet culvert a1 and the drainage culvert a2 are arranged in the same way. Both the inlet culvert a1 and the drainage culvert a2 pass water through the culvert of the box culvert, and the culverts of the inlet culvert a1 and the drainage culvert a2 are arranged in one-to-one correspondence; when the inlet culvert a1 and the drainage culvert a2 are set as box culverts with at least two culverts, the number of the energy dissipation structures 2 is also set to at least two, and the two energy dissipation structures 2 are distributed at intervals along the width direction of the well body 1; the number of the water inlets 12 and the drainage outlets 13 are both correspondingly at least two. Ensure that the water flow in each culvert dissipates energy in the corresponding energy dissipation channels 21 and flows out, avoiding flow superposition and reducing the difficulty of energy dissipation.

[0054] In this embodiment, the width of the well body 1 is the same as the width of the inlet culvert a1 and the drainage culvert a2. In this way, no additional land is added and the floor area is reduced.

[0055] The following is the design method of the drop energy dissipation well of the drainage culvert a2:

[0056] Referring to Figures 2 to 6 , the stilling basin 22 is designed as an isosceles right triangle, one of its right sides extends vertically, and the other right side extends horizontally. The height of the stilling basin 22 is set as h. The length between the end of the stilling basin 22 close to the drainage culvert a2 and the drainage culvert a2 is half of the length of the hypotenuse of the stilling basin 22.

[0057] The height of the stilling basin 22 is determined by calculating with the following formulas (1), (2) and (3).

[0058] Formula (1):

[0059]

[0060] Formula (2):

[0061]

[0062] Formula (3):

[0063]

[0064] Wherein, hc is the water depth of the inlet culvert a1; H 10 is the water depth on the stilling basin 22; q is the flow rate of a single culvert of the inlet culvert a1; g is the acceleration of gravity, 9.8 m / s2; σ s is the submergence coefficient; σ j is a coefficient, generally taken as 1.05 - 1.1; m1 is a coefficient, generally taken as 0.4 - 0.42; Fr c is the Froude coefficient before the hydraulic jump.

[0065] Set the inclination angle of the first section 2311 to θ, 30° ≤ θ ≤ 60°; the guide plate 24 is arranged in an arc shape, and the angle of the arc corresponding to the guide plate 24 is θ, and the radius is the same as the height of the culvert. The angle of the arc corresponding to the second section 2312 is 2θ, and the radius is the same as the height of the culvert.

[0066] The chute structure 23 includes a first section 2311 and a second section 2312. The design dimensions of the chute structure 23 are consistent with the dimensions of a single culvert of the culvert. The width of the chute 231 is the same as the width of the culvert of the culvert, and the height of the first section 2311 is the same as the height of the culvert of the culvert. The length of the first section 2311 is set according to the elevation difference between the inlet culvert a1 and the drainage culvert a2 and the length of the stilling basin 22.

[0067] The inlet culvert a1 and the drainage culvert a2 are set the same and use the same kind of culvert.

[0068] The width of the culvert of the culvert is set as B, and the height of the culvert of the culvert is set as H.

[0069] The design dimensions of the well body 1 are determined according to the dimensions of the culvert.

[0070] Let the length of the inner cavity 11 of the well body 1 be A, the width be B, and the height be H0; let the depth of the upper end surface of the well body 1 relative to the ground be H2. The well body 1 is cast with concrete or built with bricks, and the thickness of the well wall of the well body 1 is determined according to the depth of the well body 1 relative to the ground and the soil conditions on the peripheral side.

[0071] The number of holes, width, and height of the culvert of the box culvert are determined according to its water conveyance volume and design gradient. The wall thickness of the box culvert is determined according to its depth relative to the ground and the soil conditions on its peripheral side; the number of holes of the culvert of the box culvert is set as n, the width is set as b, and the wall thickness is set as L.

[0072] Set the height of the lower end surface of the culvert of the inlet box culvert a1 as H3, and the height of the lower end surface of the culvert of the drainage box culvert a2 as H4. The depth of the lower cavity wall of the inner cavity 11 of the well body 1 relative to the ground is H5.

[0073] The following are the calculation formulas for the length A, width B, height H0 of the well body 1, the depth H2 of the upper end surface of the well body 1 relative to the ground, and the depth H5 of the lower cavity wall of the inner cavity 11 of the well body 1 relative to the ground:

[0074] A = 3Hsinθ + 3hsinθ + (H3 - H4 - H + Hcosθ)cotθ + 3hsinθ

[0075] B = bn + (n + 1)L

[0076] H0 = H - Hcosθ + 3htanθsinθ + H3 - H4 + 0.7

[0077] H2 = H3 + H + L + 0.2

[0078] H5 = H4 - 3htanθsinθ - H + Hcosθ

[0079] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drainage box culvert waterfall energy dissipation well, characterized in that: include: A well body, wherein a water inlet and a drain are respectively provided on both sides of the well body for connecting the external environment with the inner cavity thereof, the water inlet is arranged higher than the drain, and the water inlet and the drain are respectively used to connect the water inlet culvert and the drain culvert; and, An energy dissipation structure is arranged in the inner cavity, and the energy dissipation structure forms an energy dissipation channel. The two ends of the energy dissipation channel are respectively connected to the water inlet and the drain outlet. The energy dissipation channel includes a diversion section connected to the water inlet and extending obliquely downward, and a flow diversion bucket connected to the diversion section. The energy dissipation structure includes a force dissipation sill located in the flow diversion bucket and arranged near the drain outlet.

2. The drainage box culvert drop energy dissipation well according to claim 1 is characterized in that: The energy dissipation structure comprises: A flow channel structure is formed with a flow channel with a notch facing upward, the flow channel includes a first section and a second section connected to each other, the first section is arranged to extend obliquely downward, the second section is arranged in an arc shape, and the free ends of the first section and the second section are respectively connected to the water inlet and the drain; A guide plate, one end of which is connected to the water inlet, and the other end of which extends obliquely downward and covers the notch of the flow channel to form the guide section between the first section and the guide plate; The flow diversion bucket is formed in the second section.

3. The drainage box culvert drop energy dissipation well according to claim 2 is characterized in that: The energy dissipation structure further includes a water baffle, one end of which is connected to the drain port, and the other end of which extends horizontally to above the flow-lifting bucket; The energy dissipation channel includes the lower end surface of the water baffle.

4. The drainage culvert drop energy dissipation well according to claim 3 is characterized in that: The projection from bottom to top of the other end of the water retaining plate is arranged to coincide with the lowest position of the second section.

5. The drainage culvert drop energy dissipation well according to claim 2 is characterized in that: The height of the first section is used to be the same as the height of the box culvert; The upper end surface of the second section extends in a horizontal direction.

6. The drainage culvert drop energy dissipation well according to claim 2 is characterized in that: The guide plate is arranged in an arc shape, the radius of the guide plate and the arc of the second section are the same, and the angle of the arc of the guide plate is twice the angle of the arc of the second section.

7. The drainage culvert drop energy dissipation well according to claim 1, characterized in that: The energy dissipation slope is in the shape of an isosceles right triangle, the hypotenuse of which is connected to the flow diversion bucket, and one of the right-angled edges extends upward and downward.

8. The drainage box culvert waterfall energy dissipation well according to claim 1 is characterized in that: The number of the energy dissipation structures is at least two, and the two energy dissipation structures are spaced apart and distributed along the width direction of the well body; The number of the water inlets and the number of the water outlets are both at least two.

9. The drainage culvert drop energy dissipation well according to claim 1, characterized in that: The width of the well body is used to be the same as the width of the water inlet culvert and the drainage culvert.

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