CN104563267A - Compound key overflow weir type siphon well and method implemented by same - Google Patents
Compound key overflow weir type siphon well and method implemented by same Download PDFInfo
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- CN104563267A CN104563267A CN201510047382.8A CN201510047382A CN104563267A CN 104563267 A CN104563267 A CN 104563267A CN 201510047382 A CN201510047382 A CN 201510047382A CN 104563267 A CN104563267 A CN 104563267A
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
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Abstract
The invention relates to a compound key overflow weir type siphon well which comprises at least one single well combination. Each single well combination comprises a vertical well with a water inlet culvert pipe, the vertical wells are connected with overflow connecting wells, the overflow connecting wells are connected with water delivery culvert pipes, and compound key overflow weirs are arranged between the vertical wells and the overflow connecting wells; the compound key overflow weirs comprise weir bodies, positive triangular piers and reverse triangular piers which are provided with horizontal bottom surfaces are staggered on the tops of the weir bodies, the lengths of the bottom surfaces of the positive triangular piers and the reverse triangular piers along the direction of water flow are larger than the thicknesses of the tops of the weir bodies, and front weir cantilevers and rear weir cantilevers are formed. The compound key overflow weir type siphon well has the advantages that the compound key overflow weirs are used as flow passing facilities and bubble inhibiting schemes, accordingly, the single-width flow passing ability of the overflow weirs of the siphon well can be improved, the drop flow difference between the overflow weirs of the siphon well and open seas can be reduced, bubbles mixed in the water flow which flows through the weirs can be inhibited, and influence on ambient environments can be reduced; the engineering cost can be lowered, energy can be effectively dissipated, the bubbles can be effectively eliminated, and relatively clean water can be drained.
Description
Technical field
The present invention relates to a kind of compound key overflow weir formula siphonic water-collecting well and method, is a kind of hydraulic facility and method, is drain siphon well and method that a kind of fiery nuclear power plant discharges cooling water.
Background technology
Traditional fiery nuclear power plant drain siphon well is generally middle part water inlet, and for alleviating the impact of off-lying sea tidal level change on siphonic water-collecting well Upstream section, be provided with the overflow weir that crest level exceedes mean tide tlevel in fiery nuclear power plant siphonic water-collecting well, common is sharp-crested weir, broad crested weir and practical weir.On the other hand, along with the increase of station capacity in recent years, siphonic water-collecting well four seasons inflow-rate of water turbine is all comparatively large, and be save construction cost, the size of siphonic water-collecting well itself is often less than normal.There is following problems in this design:
If water conservancy diversion, rectification measure are not taked in 1 pond, siphonic water-collecting well upstream, in the middle part of siphonic water-collecting well after influent stream sudden expansion, main flow diffusion length is inadequate, there is obvious recirculating zone in water inlet both sides, cause siphonic water-collecting well upstream fluidised form poor, and it is high to there will be the heap soil or fertilizer over and around the roots of paroxysmal water body in the middle part of overflow weir, and then affect downstream m flow state.
2, because off-lying sea tidal level is lower, siphonic water-collecting well weir crest mostly is free overflow, drop is fallen too large behind weir, a large amount of aeration in energy dissipation by hydraulic jump blending procedure, if siphonic water-collecting well downstream distance not, a large amount of bubble is failed to float up to the water surface in time and is easily brought into downstream box culvert, will form foam pollution district in outfall surrounding waters.A large amount of micro-yellow colored foam enters marine site with draining, will form foam pollution district, and affect environment waters perception, and the saliferous water smoke splashed can corrode the metallic structures near outfall in outfall surrounding waters.
Summary of the invention
For overcoming the problem of prior art, the present invention proposes a kind of compound key overflow weir formula siphonic water-collecting well and method.Described siphonic water-collecting well and method, by improving weir crest shape, improve current discharge per unit width.
The object of the present invention is achieved like this: a kind of compound key overflow weir formula siphonic water-collecting well, comprise: at least one individual well assembly, described individual well assembly comprises the vertical shaft with water inlet culvert pipe, described vertical shaft is connected with overflow connecting well, described overflow connecting well is connected with water-conveyance culvert or pipe, is provided with combined type key overflow weir between described vertical shaft and overflow connecting well; Described combined type key overflow weir comprises: weir body, described body top, weir is crisscross arranged the forward triangle pier of bottom surface level and reverse triangle pier, the bottom surface of described forward triangle pier and reverse triangle pier exceedes the thickness on body top, weir along the length of water (flow) direction, forms weir front boom and weir back boom; Arrange dividing plate between described forward triangle pier and oppositely triangle pier, described forward triangle pier is two base angles along the cross sectional shape of water (flow) direction is acute angle, and drift angle is the triangle at obtuse angle; Described reverse triangle pier is the base angle met water along the cross sectional shape of water (flow) direction is acute angle, and the base angle of backwater is obtuse angle, and drift angle is the triangle of acute angle.
Further, the upstream face of described forward triangle pier is parallel with the back side of reverse triangle pier, and the shape of described dividing plate is the parallelogram conformed to along water (flow) direction cross section with reverse triangle pier with forward triangle pier.
Further, the base angle that meets water of described forward triangle pier is greater than the base angle that meets water of reverse triangle pier.
Further, the base angle that meets water of described forward triangle pier is 30 ~ 60 degree.
Further, described forward triangle pier is three, and reverse triangle pier is two.
Further, described siphonic water-collecting well has two individual well assemblys, and the individual well assembly described in two shares a side wall, and the water outlet direction central axis of the water delivery Fang Han separately of the individual well assembly described in two is to the side wall skew shared.
Further, described siphonic water-collecting well has three individual well assemblys, and the individual well assembly described in three shares two sides side wall, and wherein the water outlet direction central axis of two individual well assemblys water delivery Fang Han separately of both sides is to the side wall skew shared.
Use a compound key overflow weir method for above-mentioned compound key overflow weir formula siphonic water-collecting well, described method comprises the steps:
Current carry out the step of vertical shaft: enter vertical shaft for current by water inlet culvert pipe
The step of eddy current before eliminating weir: force current to change for utilizing weir front boom and flow to, water conservancy diversion is carried out to feed water flow, eliminate recirculating zone, both sides, make to disappear into the clockwise whirlpool in water culvert pipe outlet top, longitudinally form S type streamline, increase flow direction distance, eliminate the paroxysmal water body occurred before weir in the middle part of vertical shaft and stop up high;
The step of current weir crest overflow: the weir crest passing through forward triangle pier and reverse triangle pier and dividing plate composition for current, forward triangle pier and reverse triangle pier and dividing plate is utilized to be staggered, improved the discharge per unit width of sluice stream, augmented flow coefficient, reduce head and go out stream and fall drop, make current from the smooth and easy overflow of weir crest;
Reduce the step of bubble behind weir: to mix with reverse triangle pier for utilizing forward triangle pier and arrange, force part water outlet current obliquely downward rapidly, clockwise whirlpool in overflow connecting well is caused to move on the whole and move forward, make aerated flow bubble enter water outlet culvert pipe before float in time, control water simultaneously and fall height, avoid too much bubble to produce;
The step that current flow out: export through overflow connecting well and water-conveyance culvert or pipe for current.
The beneficial effect that the present invention produces is: the combined type key overflow weir that the present invention adopts is as overcurrent facility and press down bubble scheme.Namely under the prerequisite as far as possible keeping former siphonic water-collecting well engineering, on the basis of existing siphonic water-collecting well, increase the hydraulic facility of some combined types, the honeycomb screen eliminating the diversion pier for adjustment fluidised form is arranged in siphonic water-collecting well upstream or arrange on weir, thus the wide conveyance capacity of the list enhancing siphonic water-collecting well overflow weir, reduce and down stream drop between off-lying sea, inhibit sluice stream blending bubble, and reduced the impact on surrounding environment.For newly-designed fiery nuclear power plant drain siphon well, use described siphonic water-collecting well and method can reduce construction costs as far as possible, and effective energy dissipating froth breaking, realize the draining of relative clean.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the structural representation of the individual well assembly of compound key overflow weir formula siphonic water-collecting well described in embodiments of the invention one;
Fig. 2 is the structural representation of the individual well assembly of compound key overflow weir formula siphonic water-collecting well described in embodiments of the invention one, is the sectional view in A-A direction in Fig. 1;
Fig. 3 is compound key overflow weir schematic perspective view described in embodiments of the invention one;
Fig. 4 is compound key overflow weir structure schematic diagram described in embodiments of the invention one, is the enlarged drawing at K place in Fig. 1;
Fig. 5 is compound key overflow weir structure schematic diagram described in embodiments of the invention one, two, be in Fig. 4 D-D to sectional view;
Fig. 6 is the structural representation that described in embodiments of the invention six, two individual well assemblys combine;
Fig. 7 is the structural representation that described in embodiments of the invention seven, three individual well assemblys combine;
Fig. 8 is the discharge coefficient correlation curve figure of example described in embodiments of the invention eight;
Fig. 9 is traditional practical overflow weir described in embodiments of the invention eight and compound key overflow weir water surface comparison diagram;
Figure 10 is the fluidised form in traditional siphonic water-collecting well;
Figure 11 is the fluidised form in traditional siphonic water-collecting well, is the E-E directional profile figure in Figure 10.
Detailed description of the invention
Embodiment one:
The present embodiment is a kind of compound key overflow weir formula siphonic water-collecting well, as shown in Fig. 1,2,3,4,5.The present embodiment comprises: at least one individual well assembly, described individual well assembly comprises the vertical shaft 2 with water inlet culvert pipe 1, described vertical shaft is connected with overflow connecting well 4, described overflow connecting well is connected with water-conveyance culvert or pipe 5, be provided with combined type key overflow weir 3 between described vertical shaft and overflow connecting well, see Fig. 1,2.Described combined type key overflow weir, as shown in Figure 2, comprise: weir body 306, described body top, weir is crisscross arranged the forward triangle pier 303 of bottom surface level and reverse triangle pier 305, the bottom surface of described forward triangle pier and reverse triangle pier exceedes the thickness on body top, weir along the length of water (flow) direction, forms weir front boom 301 and weir back boom 302.Arrange dividing plate 304 between described forward triangle pier and reverse triangle pier, described forward triangle pier is two base angles along the cross sectional shape of water (flow) direction
α 1,
β 1for acute angle, drift angle
γ 1for the triangle at obtuse angle; Described reverse triangle pier is the base angle met water along the cross sectional shape of water (flow) direction is acute angle
α 2, the base angle of backwater
β 2for obtuse angle, drift angle
γ 2for the triangle of acute angle, as shown in Figure 5.
Siphonic water-collecting well described in the present embodiment can be made up of multiple individual well assembly, can use an individual well assembly under normal circumstances, also can use two, three or more individual well assemblys, to increase flow.
The basic structure of an individual well assembly comprises into, water-conveyance culvert or pipe (enter, Conveyance Box Culvert) and a well body, is provided with overflow weir in well body.Well body is divided into two parts by overflow weir, and the part of water inlet is called vertical shaft, and the part of water outlet is called overflow connecting well.Due to the effect of overflow weir, make the current in two parts well body produce drop, occur that water falls.
The key of the present embodiment is to arrange again staggered triangle pier at the weir crest of overflow weir, forms the shape of similar key, as shown in Fig. 3,4,5.
Described in the present embodiment, compound key overflow weir entirety is made up of vertical bearing (weir body) and compound key overflow weir top.The bottom surface indention of compound key overflow weir top level, section along water (flow) direction is made up of three different building shape components: two triangles and a quadrangle, two triangles have one fixed width (perpendicular to the extension of water (flow) direction in horizontal plane), form triangle pier, and quadrangle is thin-walled, form dividing plate.It is that two base angles are acute angle, drift angle is obtuse angle and a base angle is acute angle that two triangles are divided into, and a base angle is obtuse angle, and drift angle is the triangle of acute angle.The dividing plate of quadrangle is set between the triangle that two kinds of cross sections are different, forms a basic structural unit.Arrange these basic structural units at weir crest, the triangle pier forming two kinds of cross sections being alternately arranged different is staggered.For concrete individual well assembly, several basic structural unit can be arranged as required, as 3,4 or more.
Compound key overflow weir top is placed on the body bearing of weir, and the upstream and downstream respectively to current has stretched out cantilever.Cantilever is bottom surface or the inclined plane of triangle pier, can play and stop bottom water flow impact upwards.The shape of forward triangle pier and reverse triangle pier can be determined like this: two leg-of-mutton sole length are equal and overlap, article two, hypotenuse forms two hypotenuses of a parallelogram, and two another hypotenuses leg-of-mutton, form the diagonal of parallelogram, and the line between two vertex angle is another base of parallelogram.The shape of dividing plate is this parallel four limits, that is: a base on parallel four limits and the base coincident of two triangle piers, a two hypotenuses respectively hypotenuse leg-of-mutton with two overlap, and another base of parallelogram then forms the line of two vertex angle.
Be as the criterion with the bearing center line of the basic structural unit formed with parallelogram dividing plate, build both sides are the mirror-image arrangement after upset.The acute angle of the forward triangle pier upstream face of basic structural unit
α 1angle is between 30-60 °.Due to parallelogram,
α 1the determination of angle, by whole parallelogram and within leg-of-mutton shape also determine.
Certainly, dividing plate not necessarily will be designed to parallelogram, and the cross sectional shape of two triangle piers also not necessarily will be designed to two triangles in a parallelogram, can also have multiple choices, namely basic configuration is: forward and reverse triangle pier is staggered, and arranges dividing plate between two piers.The all angles of the section triangle of two triangle piers have multiple choices, but its basic configuration is: the angle at the base angle of the upstream face of forward triangle pier is greater than the angle at the upstream face base angle of reverse triangle pier, and be all acute angle (being less than 90 degree), at the back side of triangle pier, the angle at the back side base angle of forward triangle pier is less than the base angle angle of reverse triangle pier, but the back side base angle of forward triangle pier is acute angle (being less than 90 degree), and oppositely the angle at triangle back side base angle is not only greater than the angle at the back side base angle of forward triangle pier, but also be greater than at 90 degree (obtuse angles).
Compound key overflow weir has a great difference with outlet structure escape works simple key weir used, says, key weir crest portion is wide, narrow base from build, and plane is rectangular, similar piano key.Compound key overflow weir top plane indention, section parallelogram.Compound key overflow weir top is made up of three different building shape components, and namely along 2 triangle bodies that parallelogram cutting is formed, and a parallelogram abutment wall forms its basic structure.During for siphonic water-collecting well, only need repeat several component unrolled transverse.In practice, not only stabilized structure, basic structural unit is also prefabricated very well.Compound key overflow weir top is placed on the body bearing of weir, in axis specular.Owing to having crossed out cantilever construction, positive flow and lateral flow Mixed adjustment in addition, has produced the effect of energy dissipating and froth breaking.
Embodiment two:
The present embodiment is the improvement of embodiment one, is embodiment one about the refinement of forward and reverse triangle pier and dividing plate.The upstream face of the forward triangle pier described in the present embodiment is parallel with the back side of reverse triangle pier, and the shape of described dividing plate is the parallelogram conformed to along water (flow) direction cross section with reverse triangle pier with forward triangle pier, as shown in Figure 5.
The partition shape of parallelogram has the shape of two triangle piers determined, or be the angle that two bases of dividing plate and two hypotenuses determine the ground of two triangle piers and upstream face, back side conversely speaking.
Embodiment three:
The present embodiment is the improvement of above-described embodiment, is the refinement of above-described embodiment about forward and reverse triangle pier.The base angle that meets water of the forward triangle pier described in the present embodiment is greater than the base angle that meets water of reverse triangle pier.
The concrete effect that such situation produces is: the upstream face of forward triangle pier is comparatively precipitous, and oppositely the upstream face of triangle pier is milder.
Embodiment four:
The present embodiment is the improvement of embodiment three, is the refinement of embodiment about the base angle that meets water of forward triangle pier.The base angle that meets water of the forward triangle pier described in the present embodiment
α 1it is 30 ~ 60 degree, as shown in Figure 5.
Embodiment five:
The present embodiment is the improvement of above-described embodiment, and above-described embodiment is about the refinement of forward and reverse triangle pier number.Forward triangle pier described in the present embodiment is five, and reverse triangle pier is four, as shown in Figure 1.
The basic structural unit of arrangement like this has 8 pieces of dividing plates.Its concrete width is by the width of vertical shaft and overflow connecting well, or perhaps the width of weir body and determining.
Embodiment six:
The present embodiment is the refinement of above-described embodiment, and above-described embodiment is about the refinement of individual well assembly.Siphonic water-collecting well described in the present embodiment has two individual well assemblys, and the individual well assembly described in two shares a side wall, and the water outlet direction central axis of the water delivery Fang Han separately of the individual well assembly described in two offsets to the side wall shared, as shown in Figure 6.
Embodiment seven:
The present embodiment is the refinement of above-described embodiment, and above-described embodiment is about the refinement of individual well assembly.Siphonic water-collecting well described in the present embodiment has three individual well assemblys, and the individual well assembly described in three shares two sides side wall, and wherein the water outlet direction central axis of two individual well assemblys water delivery Fang Han separately of both sides is to the side wall skew shared, as shown in Figure 7.
Embodiment eight:
The present embodiment is a kind of compound key overflow weir method using above-mentioned compound key overflow weir formula siphonic water-collecting well.Described method utilizes compound key overflow weir to improve the discharge per unit width of sluice stream, enlarges markedly discharge coefficient, to reduce on weir acting head and goes out stream and fall drop, avoid the generation of a large amount of bubble.Single wider than flow owing to improve, siphonic water-collecting well design size can be reduced, save engineering quantity.
The present embodiment be effective improve discharge per unit width and enlarge markedly the theoretical principle of discharge coefficient and Fundamentals of Mathematics as follows:
Compound key overflow weir due to weir axis longitudinally (water (flow) direction) be elongated, form multiple end to end survey weir, overflow forward position than straight line weir increase several times, when weir head is identical, conveyance capacity improves a lot than conventional outflow weir.
The characteristic parameter of the compound key overflow weir that the present embodiment uses as shown in Figure 4,5, in Fig. 4
wfor horizontal weir is wide;
bfor one, weir basic structural unit is along the length of water (flow) direction,
pfor height of weir, definition
lfor individual well assembly is along the total length of water (flow) direction, this total length can be determined like this:
l=W+2NB, wherein
nfor the number of basic structural unit.
The design parameters on weir will mainly be comprised to the influence factor of siphonic water-collecting well conveyance capacity, as beam overall L, the wide W in horizontal weir, vertical height of weir P, the width W i in Inlet and outlet water palace, Wo, length B, T
sfor abutment wall is thick etc., comprise approach velocity head with weir head H(in addition), flow velocity
v, acceleration of gravity is relevant with density, its functional relation can be expressed as follows:
(1)
By Buckingham theorem and flow formula, can obtain:
(2)
Wherein C
dfor dimensionless factor.Because weir thickness is very little on the impact of flow, if ignore its impact, formula (2) can be written as
(3)
In formula, a is undetermined coefficient.
By theory analysis and utilize experimental data to carry out matching, optimizing in conjunction with genetic algorithm, the optimal solution obtaining above-mentioned coefficient is:
(4)
In order to assess the conveyance capacity of compound key overflow weir, with a flow-rate ratio coefficient (or super let out ratio), compound key overflow weir is described:
(5)
In formula:
q d ,
c d be respectively flow and the discharge coefficient of compound key overflow weir.For the sharp-crested weir of standard, discharge coefficient
c s available Rehbock or Bazin formulae discovery, be approximately equal to constant constant, namely
c s =0.42, for the WES practical weir (Ogee-crested weir) of standard,
c s =0.494.Because tradition practical overflow weir conveyance capacity is relatively maximum, traditional practical overflow weir is selected to compare here.The discharge coefficient correlation curve figure of what Fig. 8 provided is traditional practical overflow weir and compound key overflow weir.This curve map sets forth the discharge coefficient curve (represented by dashed line in Fig. 8) of traditional practical overflow weir (practical weir), and the discharge coefficient curve of the actual test value (data experiment value) of the contrast experiment of compound key overflow weir in contrast (representing with the point be interrupted in Fig. 8) and the calculated value of formula (5) carry out contrasting (indicated by the solid line in Fig. 8).In example, flow-rate ratio coefficient is namely super lets out than between 1.2-3.5, and
h/Pbe worth less, super ability of letting out is stronger, when
h/Pduring >1, surpass and let out than being less than 1.5.If this shows to design according to the present embodiment, reach head needed for same design inflow-rate of water turbine
hmuch smaller than head needed for standard utility overflow weir siphonic water-collecting well, namely the two difference is the head difference reduced, as shown in Figure 9.Current dotted line in Fig. 9 represents the water surface curve of traditional practical overflow weir, and solid line represents the water surface curve of the present embodiment.
Compound key overflow weir effectively can improve sluice stream discharge per unit width, and under same design flow, same to sharp-crested weir, broad crested weir are compared with practical weir, discharge coefficient enlarges markedly, and on weir, acting head obviously reduces, and goes out stream and falls drop reduction, and then current blending declines, inhibit bubble to produce.
Compound key overflow weir lowers due to weir head, and design is upper can reduce pond, overflow weir downstream length, and then reduction siphonic water-collecting well global design size, decreases engineering quantity while minimizing floor space, small investment and maintenance cost is low.Fig. 9 illustrates the gap on compound key overflow weir and conventional outflow weir.Fig. 9 show respectively the weir crest shape on compound key overflow weir and conventional outflow weir at the top solid line of overflow weir and dotted line.Its principle is:
According to the regulation of " steam power station Code for Hydraulic Designing (DL/T 5339-2006) ", the design of overflow weir longitudinal size is calculated as follows:
(6)
In formula:
l 1for vertical shaft is along the length of water (flow) direction,
l 2for overflow connecting well is along the length of water (flow) direction,
d 0for water inlet culvert pipe profile height or diameter,
hfor overflow weir acting head (Fig. 9 dotted line and solid line mark the position of two arrows, represent the acting head as head and compound key overflow weir of conventional overflow weir respectively),
c h for the height in overflow weir downstream.
The weir-type of specification recommends overflow weir is sharp-crested weir, but in engineering, also has and adopt broad crested weir, practical weir, broken line weir etc.Compound key overflow weir formula siphonic water-collecting well reaches head needed for same design inflow-rate of water turbine
hmuch smaller than head needed for standard utility overflow weir siphonic water-collecting well, from formula (6), by the present invention's design, overflow weir longitudinal size will obviously reduce, and this will reduce floor space, reduce engineering quantity simultaneously, have more economic rationality.Further, on weir, water level and off-lying sea tidal-level difference type reduce, and sluice stream blending bubble measures and suppresses to weaken excessively.
The cantilever construction that compound key overflow weir upstream side is given prominence to makes overflow weir possess water conservancy diversion, adjust stream and energy dissipating effect.Cantilever construction is forced current to change and is flowed to, same sharp-crested weir, broad crested weir are compared with practical weir effect, great changes will take place for pond, upstream fluidised form, recirculating zone, original both sides disappears, the clockwise whirlpool in water inlet top disappears, and the substitute is vertical S type streamline, is equivalent to and adds flow direction distance, made sluice stream more smooth-going, and eliminated the paroxysmal water body occurred before weir in the middle part of conventional design siphonic water-collecting well and stop up high.The diversion pier arranged in siphonic water-collecting well upstream for adjustment fluidised form or the honeycomb screen arranged on weir can omit.The present embodiment utilizes the outstanding cantilever construction of compound key overflow weir upstream side to force current to change and flows to, the recirculating zone of original both sides is disappeared, the clockwise whirlpool in water inlet top disappears, longitudinally form S type streamline, increase flow direction distance, eliminating the paroxysmal water body occurred before weir in the middle part of siphonic water-collecting well stops up high, plays guide functions, as shown in Figure 1, 2.
On the weir of compound key overflow weir, flow-shape has difference greatly.Compound key overflow weir crosses the mixture that sluice stream belongs to positive flow (triangle body) and lateral flow (survey weir), weir there are two water surface curves, water flows through side weir rear steering downstream flow, mutually clash into the water outlet current that oblique angle is downward, force these part current downward rapidly, instead of forward, the clockwise whirlpool in pond, downstream is caused to move on the whole and weaken, be conducive to floating in time before aerated flow bubble enters downstream culvert pipe, and further suppress the quantity of blending bubble, as shown in Figure 2.
The present embodiment is especially applicable to the upgrading of built broad crested weir or sharp-crested weir siphonic water-collecting well, all applicable for (being provided with partition wall in the middle part of general siphonic water-collecting well) such as fiery nuclear power plant one machine one well, machine two wells.Limit by factors such as siphonic water-collecting well landform, wanting to obtain compared with small drop routine is design wider siphonic water-collecting well, but after application the present embodiment, discharge per unit width enlarges markedly.In other words, adopt the design of compound key overflow weir siphonic water-collecting well, under the siphonic water-collecting well width conditions of conventional design, conveyance capacity will strengthen significantly.
Described method comprises following concrete steps:
Current carry out the step of vertical shaft: enter vertical shaft for current by water inlet culvert pipe.
The step of eddy current before eliminating weir: force current to change for utilizing weir front boom and flow to, water conservancy diversion is carried out to feed water flow, eliminate recirculating zone, both sides, make to disappear into the clockwise whirlpool in water culvert pipe outlet top, longitudinally form S type streamline, increase flow direction distance, eliminate the paroxysmal water body occurred before weir in the middle part of vertical shaft and stop up high.After the current of traditional siphonic water-collecting well enter siphonic water-collecting well sudden expansion, main flow diffusion length is inadequate, there is obvious recirculating zone in water inlet both sides, that is: the vertical axes eddy flow that generation two is larger before overflow weir and a horizontal axis eddy flow, as shown in Figure 10,11, cause siphonic water-collecting well upstream fluidised form poor, and it is high to there will be the heap soil or fertilizer over and around the roots of paroxysmal water body in the middle part of overflow weir, and then affects downstream m flow state.And in this step, owing to using compound key overflow weir, change fluidised form (see Fig. 1,2), solve whirlpool problem.
The step of current weir crest overflow: the weir crest passing through forward triangle pier and reverse triangle pier and dividing plate composition for current, forward triangle pier and reverse triangle pier and dividing plate is utilized to be staggered, improved the discharge per unit width of sluice stream, augmented flow coefficient, reduce head and go out stream and fall drop, make current from the smooth and easy overflow of weir crest.
Reduce the step of bubble behind weir: to mix with reverse triangle pier for utilizing forward triangle pier and arrange, force part water outlet current obliquely downward rapidly, clockwise whirlpool in overflow connecting well is caused to move on the whole and move forward, make aerated flow bubble enter water outlet culvert pipe before float in time, control water simultaneously and fall height, avoid too much bubble to produce.Traditional siphonic water-collecting well overflow weir is free overflow, drop is fallen too large, a large amount of aeration in energy dissipation by hydraulic jump blending procedure, if siphonic water-collecting well downstream distance not behind weir, a large amount of bubble is failed to float up to the water surface in time and is easily brought into downstream box culvert, will form foam pollution district in outfall surrounding waters.And the weir crest of the forward triangle pier that previous step uses and reverse triangle pier and dividing plate composition improved the discharge per unit width of sluice stream, augmented flow coefficient, reduce head and go out stream and fall drop, this step then utilizes forward triangle pier to mix with reverse triangle pier and arranges, force part water outlet current obliquely downward rapidly, cause clockwise whirlpool in overflow connecting well move on the whole and move forward, also have obvious froth breaking effect, both combine and well solve the problems referred to above.
The step that current flow out: export through overflow connecting well and water-conveyance culvert or pipe for current.
Finally it should be noted that, below only in order to technical scheme of the present invention to be described and unrestricted, although with reference to preferred arrangement scheme to invention has been detailed description, those of ordinary skill in the art is to be understood that, can to technical scheme of the present invention (the such as concrete form of piano type overflow weir, the parameters, specification etc. of overflow weir) modify or equivalent replacement, and do not depart from the spirit and scope of technical solution of the present invention.
Claims (8)
1. a compound key overflow weir formula siphonic water-collecting well, comprise: at least one individual well assembly, described individual well assembly comprises the vertical shaft with water inlet culvert pipe, described vertical shaft is connected with overflow connecting well, described overflow connecting well is connected with water-conveyance culvert or pipe, it is characterized in that, between described vertical shaft and overflow connecting well, be provided with combined type key overflow weir; Described combined type key overflow weir comprises: weir body, described body top, weir is crisscross arranged the forward triangle pier of bottom surface level and reverse triangle pier, the bottom surface of described forward triangle pier and reverse triangle pier exceedes the thickness on body top, weir along the length of water (flow) direction, forms weir front boom and weir back boom; Arrange dividing plate between described forward triangle pier and oppositely triangle pier, described forward triangle pier is two base angles along the cross sectional shape of water (flow) direction is acute angle, and drift angle is the triangle at obtuse angle; Described reverse triangle pier is the base angle met water along the cross sectional shape of water (flow) direction is acute angle, and the base angle of backwater is obtuse angle, and drift angle is the triangle of acute angle.
2. siphonic water-collecting well according to claim 1, it is characterized in that, the upstream face of described forward triangle pier is parallel with the back side of reverse triangle pier, and the shape of described dividing plate is the parallelogram conformed to along water (flow) direction cross section with reverse triangle pier with forward triangle pier.
3. siphonic water-collecting well according to claim 1 and 2, is characterized in that, the base angle that meets water of described forward triangle pier is greater than the base angle that meets water of reverse triangle pier.
4. siphonic water-collecting well according to claim 3, is characterized in that, the base angle that meets water of described forward triangle pier is 30 ~ 60 degree.
5. siphonic water-collecting well according to claim 4, is characterized in that, described forward triangle pier is five, and reverse triangle pier is four.
6. siphonic water-collecting well according to claim 5, it is characterized in that, described siphonic water-collecting well has two individual well assemblys, and the individual well assembly described in two shares a side wall, and the water outlet direction central axis of the water delivery Fang Han separately of the individual well assembly described in two is to the side wall skew shared.
7. siphonic water-collecting well according to claim 5, it is characterized in that, described siphonic water-collecting well has three individual well assemblys, and the individual well assembly described in three shares two sides side wall, and wherein the water outlet direction central axis of two individual well assemblys water delivery Fang Han separately of both sides is to the side wall skew shared.
8. use a compound key overflow weir method for compound key overflow weir formula siphonic water-collecting well described in claim 1, described method comprises the steps:
Current carry out the step of vertical shaft: enter vertical shaft for current by water inlet culvert pipe
It is characterized in that:
The step of eddy current before eliminating weir: force current to change for utilizing weir front boom and flow to, water conservancy diversion is carried out to feed water flow, eliminate recirculating zone, both sides, make to disappear into the clockwise whirlpool in water culvert pipe outlet top, longitudinally form S type streamline, increase flow direction distance, eliminate the paroxysmal water body occurred before weir in the middle part of vertical shaft and stop up high;
The step of current weir crest overflow: the weir crest passing through forward triangle pier and reverse triangle pier and dividing plate composition for current, forward triangle pier and reverse triangle pier and dividing plate is utilized to be staggered, improved the discharge per unit width of sluice stream, augmented flow coefficient, reduce head and go out stream and fall drop, make current from the smooth and easy overflow of weir crest;
Reduce the step of bubble behind weir: to mix with reverse triangle pier for utilizing forward triangle pier and arrange, force part water outlet current obliquely downward rapidly, clockwise whirlpool in overflow connecting well is caused to move on the whole and move forward, make aerated flow bubble enter water outlet culvert pipe before float in time, control water simultaneously and fall height, avoid too much bubble to produce;
The step that current flow out: export through overflow connecting well and water-conveyance culvert or pipe for current.
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| CN106894350A (en) * | 2017-02-13 | 2017-06-27 | 中交隧道工程局有限公司 | A kind of steel basil is buried jacking box culvert device and construction method |
| CN108411859A (en) * | 2018-03-17 | 2018-08-17 | 河南水利与环境职业学院 | A kind of overflow weir structure construction method for mountain area hydropower station pressure forebay |
| CN109024860A (en) * | 2018-08-13 | 2018-12-18 | 河海大学 | A method of ensureing multitube influent stream sewage lifting pump station water inlet box culvert even water distribution |
| CN109594521A (en) * | 2018-12-24 | 2019-04-09 | 浙江省水利河口研究院 | A kind of raw tidal system of wide sink of high-precision flow control is united and control method |
| CN114370036A (en) * | 2022-02-16 | 2022-04-19 | 重庆交通大学 | Novel fishway structure of key weir combination orifice formula |
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| CN106400753A (en) * | 2016-09-22 | 2017-02-15 | 中国水利水电科学研究院 | Key weir flow-type classified energy dissipation defoaming siphon well and method |
| CN106400753B (en) * | 2016-09-22 | 2018-12-14 | 中国水利水电科学研究院 | A kind of key weir flow formula classified energy-dissipation defoaming siphonic water-collecting well and method |
| CN106894350A (en) * | 2017-02-13 | 2017-06-27 | 中交隧道工程局有限公司 | A kind of steel basil is buried jacking box culvert device and construction method |
| CN108411859A (en) * | 2018-03-17 | 2018-08-17 | 河南水利与环境职业学院 | A kind of overflow weir structure construction method for mountain area hydropower station pressure forebay |
| CN109024860A (en) * | 2018-08-13 | 2018-12-18 | 河海大学 | A method of ensureing multitube influent stream sewage lifting pump station water inlet box culvert even water distribution |
| CN109024860B (en) * | 2018-08-13 | 2019-08-20 | 河海大学 | A method of ensureing multitube influent stream sewage lifting pump station water inlet box culvert even water distribution |
| CN109594521A (en) * | 2018-12-24 | 2019-04-09 | 浙江省水利河口研究院 | A kind of raw tidal system of wide sink of high-precision flow control is united and control method |
| CN109594521B (en) * | 2018-12-24 | 2023-09-19 | 浙江省水利河口研究院 | High-precision flow control wide water tank tide generating system and control method |
| CN114370036A (en) * | 2022-02-16 | 2022-04-19 | 重庆交通大学 | Novel fishway structure of key weir combination orifice formula |
| CN114370036B (en) * | 2022-02-16 | 2024-04-12 | 重庆交通大学 | Novel fishway structure of key weir combination drill way formula |
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