CN209703447U - A kind of overfall dam defrlector bucket - Google Patents

A kind of overfall dam defrlector bucket Download PDF

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Publication number
CN209703447U
CN209703447U CN201920306064.2U CN201920306064U CN209703447U CN 209703447 U CN209703447 U CN 209703447U CN 201920306064 U CN201920306064 U CN 201920306064U CN 209703447 U CN209703447 U CN 209703447U
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section
ogee section
ogee
level
dam
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胡娟
刘昊
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PowerChina Zhongnan Engineering Corp Ltd
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PowerChina Zhongnan Engineering Corp Ltd
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Abstract

The utility model discloses a kind of overfall dam defrlector buckets, including sequentially connected weir surface curve section, steep slope section, first order ogee section, the outlet of first order ogee section is higher than downstream peak level, step is pressed from top to bottom equipped at least one level ogee section along the downstream upright slope of dam body, and the outlet of afterbody ogee section is higher than downstream constant level.For the utility model by setting multistage stair structure for defrlector bucket, every level-one is all one section of ogee section, and when the operation of small flow, the ogee section of lower step can accept water flow and form flip shot, avoids causing to wash away very much to toe;In big flow operation, when the ogee section flip shot of higher step, flow reduces after the collision of part water flow, drops to the ogee section of lower step, then in the ogee section flip shot of lower step, avoids and cause to wash away to dam site, guarantee the safety of dam.Therefore, energy dissipating can be carried out to the flood of different flow, effectively alleviates flood to washing away at toe.

Description

A kind of overfall dam defrlector bucket
Technical field
The utility model belongs to hydraulic and hydroelectric engineering, and in particular to a kind of overfall dam defrlector bucket.
Background technique
In hydraulic and hydroelectric engineering, defrlector bucket is commonly used in the end of discharge structure as a kind of energy-dissipating structure, by water Stream is chosen to aerial, and water flow and air is made to collide energy dissipating, to mitigate the harm to underwater bed.
As shown in Figure 1, the form of fracture of existing defrlector bucket is single circular arc segment structure, including sequentially connected weir Surface curve section 6, steep slope section 7, ogee section 2. easily cause toe and wash away when small flow is run;Even big When flow, flow reduces after the collision of part water flow when flip shot, drops to dam site, also can cause to wash away to dam site, can all threaten To the safety of dam.
Utility model content
In view of the above-mentioned problems, the utility model is intended to provide
The technical solution that the utility model solves the problems, such as is: a kind of overfall dam defrlector bucket, including sequentially connected weir face The outlet of curved section, steep slope section, first order ogee section, first order ogee section is higher than downstream peak level, and the downstream along dam body is straight Step is pressed equipped at least one level ogee section in vertical slope from top to bottom, and the outlet of afterbody ogee section is higher than downstream constant level.
Further, from top to bottom, from first order ogee section into afterbody ogee section, the radius of rear stage ogee section The radius R and flip shot angle a of the small level-one thereon of R and flip shot angle a.
Specifically, the radius R of first order ogee section is 8~10 times of the anti-arc minimum point depth of water h of first order ogee section;
The flip shot angle a of first order ogee section is 15 °~25 °.
Specifically, the radius R of second level ogee section is 6~8 times of the anti-arc minimum point depth of water h of second level ogee section;
The flip shot angle a of second level ogee section is 10 °~20 °.
Preferably, at least two-stage ogee section is successively arranged by step from top to bottom along the downstream upright slope of dam body, adjacent two Flip shot angle a between grade ogee section differs 5 °;
The radius of n-th grade of ogee section is (10-2n) hn≤ R≤(12-2n) hn, wherein n is defined as series, is positive whole Number;hnFor the anti-arc minimum point depth of water of n-th grade of ogee section.
The overfall dam defrlector bucket that above-mentioned preferred scheme is constituted is at least three-level ogee section structure, ogee section not at the same level Anti- arc minimum point depth of water h it is different.
The utility model is by setting multistage stair structure for defrlector bucket, and every level-one is all one section of ogee section, small When flow is run, the ogee section of lower step can accept water flow and form flip shot, avoid causing to wash away very much to toe;It is flowing greatly When amount operation, when the ogee section flip shot of higher step, flow reduces after the collision of part water flow, drops to the anti-arc of lower step Section, then in the ogee section flip shot of lower step, avoids and causes to wash away to dam site, guarantee the safety of dam.It therefore, can be to not Flood with flow carries out energy dissipating, effectively alleviates flood to washing away at toe.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawing.
Fig. 1 is prior art defrlector bucket section structure diagram.
Fig. 2 is the utility model defrlector bucket section structure diagram.
In figure: 1- dam body, 2- ogee section, 3- first order ogee section, the second level 4- ogee section, 5- afterbody ogee section, The weir 6- surface curve section, 7- steep slope section, the downstream 8- upright slope.
Specific embodiment
As shown in Fig. 2, a kind of overfall dam defrlector bucket, including sequentially connected weir surface curve section 6, steep slope section 7, the first order Ogee section 3.The outlet of first order ogee section 3 is higher than downstream peak level.
Downstream upright slope 8 along dam body 1 is equipped at least one level ogee section by step from top to bottom.Moreover, afterbody is anti- The outlet of segmental arc 5 is higher than downstream constant level.
From top to bottom, from first order ogee section 3 into afterbody ogee section 5, the radius R of rear stage ogee section and flip shot The radius R and flip shot angle a of the small level-one thereon of angle a.
It is described as follows by taking two-stage ogee section as an example:
The radius R of first order ogee section 3 is 8~10 times of the anti-arc minimum point depth of water h of first order ogee section 3.The first order The flip shot angle a of ogee section 3 is 15 °~25 °.
The radius R of second level ogee section 4 is 6~8 times of the anti-arc minimum point depth of water h of second level ogee section 4.The second level is anti- The flip shot angle a of segmental arc 4 is 10 °~20 °.
If the overfall dam defrlector bucket constituted is at least three-level ogee section structure, then according to above-mentioned two-stage ogee section Scheme is analogized to obtain following rule: the flip shot angle a between adjacent two-stage ogee section differs 5 °.
The radius of n-th grade of ogee section is (10-2n) hn≤ R≤(12-2n) hn, wherein n is defined as series, is positive whole Number;hnFor the anti-arc minimum point depth of water of n-th grade of ogee section.
The anti-arc minimum point depth of water h of ogee section not at the same level is different.
When the operation of small flow, the ogee section of lower step can accept water flow and form flip shot, avoid making very much toe At washing away;In big flow operation, when the ogee section flip shot of higher step, flow reduces after the collision of part water flow, drops to The ogee section of lower step avoids then in the ogee section flip shot of lower step and causes to wash away to dam site, guarantees the peace of dam Entirely.

Claims (5)

1. a kind of overfall dam defrlector bucket, including sequentially connected weir surface curve section, steep slope section, first order ogee section, the first order The outlet of ogee section is higher than downstream peak level, it is characterised in that: the downstream upright slope along dam body is equipped with by step from top to bottom At least one level ogee section, and the outlet of afterbody ogee section is higher than downstream constant level.
2. overfall dam defrlector bucket according to claim 1, it is characterised in that: from top to bottom, from first order ogee section to In afterbody ogee section, the radius R and flip shot angle of the small level-one thereon of radius R and flip shot angle a of rear stage ogee section a。
3. overfall dam defrlector bucket according to claim 1, it is characterised in that: the radius R of first order ogee section is first 8~10 times of the anti-arc minimum point depth of water h of grade ogee section;
The flip shot angle a of first order ogee section is 15 °~25 °.
4. overfall dam defrlector bucket according to claim 3, it is characterised in that: the radius R of second level ogee section is second 6~8 times of the anti-arc minimum point depth of water h of grade ogee section;
The flip shot angle a of second level ogee section is 10 °~20 °.
5. overfall dam defrlector bucket according to claim 1-4, it is characterised in that: along the downstream upright slope of dam body It is successively arranged at least two-stage ogee section by step from top to bottom, the flip shot angle a between adjacent two-stage ogee section differs 5 °;
The radius of n-th grade of ogee section is (10-2n) hn≤ R≤(12-2n) hn, wherein n is defined as series, is positive integer; hnFor the anti-arc minimum point depth of water of n-th grade of ogee section.
CN201920306064.2U 2019-03-12 2019-03-12 A kind of overfall dam defrlector bucket Active CN209703447U (en)

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CN201920306064.2U CN209703447U (en) 2019-03-12 2019-03-12 A kind of overfall dam defrlector bucket

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CN201920306064.2U CN209703447U (en) 2019-03-12 2019-03-12 A kind of overfall dam defrlector bucket

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111236180A (en) * 2020-01-15 2020-06-05 湖南中信水电建设有限公司 Energy dissipation structure of hydraulic and hydroelectric engineering

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111236180A (en) * 2020-01-15 2020-06-05 湖南中信水电建设有限公司 Energy dissipation structure of hydraulic and hydroelectric engineering

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