CN115323998B - Oblique angle conduit diversion dissipating pier and asymmetric outflow coupling energy dissipation method - Google Patents
Oblique angle conduit diversion dissipating pier and asymmetric outflow coupling energy dissipation method Download PDFInfo
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- CN115323998B CN115323998B CN202211045320.XA CN202211045320A CN115323998B CN 115323998 B CN115323998 B CN 115323998B CN 202211045320 A CN202211045320 A CN 202211045320A CN 115323998 B CN115323998 B CN 115323998B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention discloses an oblique angle conduit diversion power dissipating pier and an asymmetric outflow coupling energy dissipating method, wherein the power dissipating pier comprises a cubic pier body, a power dissipating surface with an arc surface protruding to the downstream is arranged on the upstream surface of the power dissipating pier body, a circular diversion guide channel is arranged in the pier body, a water inlet of the guide channel is positioned on the power dissipating surface, and a water outlet of the guide channel is positioned on the oblique cutting side surface; the flow direction of water flow in the outflow high flow velocity area is adjusted by adopting an asymmetric outflow coupling energy dissipation method of the oblique angle conduit diversion energy dissipation pier, so that the high flow velocity area and the low flow velocity area are subjected to energy dissipation coupling, the flow velocity at the water outlet is homogenized and reduced, the phenomena of one side of a downstream river bed is flushed and one side is deposited and the large-scale backflow caused by uneven energy dissipation are avoided, the engineering safety is ensured, and the aim of saving engineering cost is achieved.
Description
Technical Field
The invention relates to a force dissipating pier, in particular to an oblique angle conduit turning force dissipating pier, and further relates to an asymmetric outflow coupling energy dissipating method adopting the oblique angle conduit turning force dissipating pier.
Background
The energy dissipation pier is an energy dissipation device which is arranged in the energy dissipation pool and is used for supplementing energy dissipation and reducing the length of the energy dissipation pool. Aiming at the condition that the outflow flow of a water outlet building such as an expansion pump station and the outflow flow of an original water outlet building are uneven in engineering, a power consumption pier is adopted for adjustment, but the common power consumption pier has lower efficiency capability, mainly adjusts water flow in the vertical shaft direction, plays a role in counterattack on the water flow, divides the water flow into a plurality of small water strands, turns the water flow and impacts each other at the pier part, and the water flow and the power consumption pier surface rub and spin-roll generated by the water flow cause strong turbulence to eliminate energy, so that the outflow flow speed deviation at two sides is larger, the phenomena of scouring at one side, silting at one side and large-scale backflow of a downstream river bed are generated, and the safe and stable operation of the hydraulic building such as the pump station is seriously influenced. The traditional stilling piers also have the problem of narrow application range, when encountering the unfavorable working condition that the asymmetric outflow velocity difference of two sides of a yielding building is extremely large, the length of the stilling pool in a high-velocity zone can only be further prolonged, so that the construction cost can be increased in actual engineering, the velocity difference still exists between water flows at two sides after the stilling pool is jumped out, and the large-scale backflow phenomenon of a downstream river bed is caused.
Disclosure of Invention
The invention aims to: the invention aims to provide an oblique angle conduit diversion and dissipation pier with strong energy dissipation effect and reduced construction cost, and a second aim is to provide an asymmetric outflow coupling energy dissipation method adopting the oblique angle conduit diversion and dissipation pier.
The technical scheme is as follows: the oblique angle conduit turning force dissipating pier comprises a cubic pier body, wherein an inward concave arc force dissipating surface is arranged on the upstream surface of the pier body, a circular turning guide channel is arranged in the pier body, a water inlet of the guide channel is positioned on the force dissipating surface, and a water outlet of the guide channel is positioned on the oblique cutting side surface.
Preferably, the pier height of the stilling pier is 0.15-0.2 times of the water depth, and the center point of the water inlet is 0.5-0.55 times of the pier height from the bottom surface of the stilling pier.
Preferably, the diversion channel is a diameter-variable circular diversion channel, wherein the inner diameter of the water inlet at the water inlet is 0.3-0.35 times of pier height, and the inner diameter of the water outlet at the water outlet is 0.25-0.3 times of pier height.
Preferably, the inclined angle of the inclined cutting side face is 45 degrees to 60 degrees, and the inclined side length is 1.1 times to 1.3 times of pier height.
Preferably, the weight of the relief surface on the upstream surface is 60% -70%.
Preferably, the arc of the relief surface is 140 ° -160 °.
Preferably, the back surface is inclined at an angle of 70 ° -80 °.
Preferably, the long side of the top surface is 1.2-1.3 times of pier height, the short side is 0.8-0.9 time of pier length, and the width is 0.6-0.7 time of pier height; the long side of the bottom surface is 1.9-2.1 times of pier height, the short side is 0.9-1.0 times of pier height, and the width is 0.8-0.9 times of pier height.
The asymmetric outflow coupling energy dissipation method is characterized in that oblique angle guide pipes are arranged in a high flow velocity area in a staggered mode, and the distance between the energy dissipation piers is 0.5-0.75 times of pier height.
Preferably, the force dissipating piers are arranged in a quincuncial staggered manner, and the force dissipating piers are arranged from a low flow rate area to a high flow rate area in a height manner from low to high; adjusting according to the flow rate of the water outlet, and taking the net distance of the stilling piers as 0.6-0.75 times of pier height when the ratio of the flow rate of the high flow rate area to the flow rate of the low flow rate area is 1-2; when the ratio of the flow rate in the high flow rate area to the flow rate in the low flow rate area is more than 2, the net distance between the stilling piers is 0.5-0.6 times of the pier height.
The principle of the invention: the oblique force dissipating pier not only ensures the energy dissipating effect in the vertical shaft direction, but also can automatically adjust the water flow direction of the outflow high flow velocity region in the horizontal direction, so that the high flow velocity region and the low flow velocity region are subjected to energy dissipating coupling, and the flow velocity at the water outlet is homogenized and reduced. When the water flow in the high flow velocity area flows into the diversion holes, the water flow flows out from the diversion inclined plane side and is converged into the low flow velocity area under the direction-changing regulation action of the guide pipe. The exiting diagonal water flow results in a reduced relatively effective flow cross-sectional area in the low flow velocity zone. The greater the corner flow rate created by the bleed flow, the smaller the effective flow cross-sectional area of the low flow velocity zone. Thereby achieving the purpose of automatically adjusting the flow speed balance of water flows at two sides. The generated transverse water flow and the water flow in the low flow velocity area are mutually turbulent to dissipate energy, so that the high flow velocity area and the low flow velocity area are coupled to dissipate energy, and the flow velocity at the water outlet is homogenized and reduced. The front surface of the oblique angle conduit turning and dissipating pier is provided with an arc-shaped dissipating surface in the water facing direction, part of water flow at the water outlet is subjected to opposite flushing and dissipating energy at the arc-shaped dissipating surface, and the other part of water flow passes through the dissipating pier to form swirling and rolling, so that the energy dissipating effect is improved.
The asymmetric outflow coupling energy dissipation method can achieve the purposes of coupling energy dissipation and automatic balancing of the flow velocity of water outlets on two sides on the premise of not changing the length of the absorption basin. The oblique angle conduit diversion power dissipation piers are arranged in plum blossom-shaped dislocation in the power dissipation pool of the water outlet of the high flow velocity zone of the water outlet building such as the extension pump station, so that the requirements of energy dissipation and balance of flow velocity on two sides can be met simultaneously. The water flow discharged through the diversion channel can impact with the adjacent pier to further influence the stability. When the pier is arranged, the pier is arranged from low flow velocity area to high flow velocity area in elevation from low flow velocity area to high flow velocity area, the position is higher, the interaction of water flows of adjacent pier can be reduced based on the position, and the structure is more stable.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages: (1) The oblique angle conduit diversion pier can automatically adjust the water flow energy dissipation rate in the horizontal direction, and the energy dissipation effect is improved by 2-3 times compared with the highest energy dissipation effect of the traditional pier; (2) By adopting the asymmetric outflow coupling energy dissipation method of the oblique angle conduit diversion dissipating pier, the length of the dissipating pond can be shortened to 3-4 times of the height of the pier, compared with the traditional energy dissipation method for prolonging the dissipating pond, the energy dissipation method for prolonging the dissipating pond is shortened by 2 times, the manpower and material resources consumed by engineering are greatly reduced, and meanwhile, the safety and the high efficiency of the engineering are ensured.
Drawings
FIG. 1 is a schematic view of a pier according to the present invention;
FIG. 2 is a front view of the pier of the present invention;
FIG. 3 is a left side view of the pier of the present invention;
FIG. 4 is a top view of the pier of the present invention;
FIG. 5 is a schematic flow diagram without the force dissipating piers;
FIG. 6 is a schematic flow diagram of an elongated high flow area stilling basin;
fig. 7 is a schematic flow diagram of a quincuncial hollow-insertion arrangement oblique-angle conduit turning pier.
Description of the embodiments
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Example 1
As shown in figures 1-4, the oblique angle conduit diversion power pier is a cube pier body consisting of a water facing surface 1, an oblique cutting side surface 3, a water back surface 7, a vertical side surface 8, a top surface 9 and a bottom surface 10, wherein the water facing surface 1 of the power pier is provided with an inward concave arc power dissipating surface 2, the power dissipating surface 2 is provided with a water inlet 4, the oblique cutting side surface 3 is provided with a water outlet 5, the water inlet 4 is communicated with the water outlet 5, a horizontally arranged diversion channel 6 is formed in the power dissipating pier, and the diversion channel 6 changes the flow direction of water flow parallel to a river into the flow direction vertical to the river.
The pier height of the stilling pier is 0.15 times of the water depth, and the center point of the water inlet 4 is 0.5 times of the pier height from the bottom surface of the stilling pier; the diversion channel 6 is a diameter-variable circular diversion channel, wherein the inner diameter of the water inlet 4 at the water inlet is 0.35 times of the pier height, and the inner diameter of the water outlet 5 at the water outlet is 0.25 times of the pier height; the inclined angle of the inclined cutting side face 3 is 60 degrees, and the inclined side length is 1.3 times of the pier height; the proportion of the absorption surface 2 on the water-facing surface 1 is 60%; the radian of the absorption surface 2 is 160 degrees; the inclination angle of the back surface 7 is 80 degrees; the long side of the top surface 9 is 1.3 times of the pier height, the short side of the top surface 9 is 0.9 times of the pier length, and the width of the top surface 9 is 0.7 times of the pier height. The long side of the bottom surface 10 is 2.1 times of the pier height, the short side of the bottom surface 10 is 1.0 times of the pier height, and the width of the bottom surface 10 is 0.9 times of the pier height.
The water flow in the high flow velocity area flows to the diversion holes of the stilling piers, and flows out from the diversion inclined plane side and rushes into the low flow velocity area through the diversion adjustment function of the guide pipe, the generated transverse water flow reduces the relatively effective flow cross section area of the low flow velocity area, the turbulence degree of the water flow is increased, and meanwhile, the transverse water flow and the water flow in the low flow velocity area are mutually turbulent to dissipate energy, so that the flow velocities at the outlets at the two sides are redistributed, and the purpose of balancing the flow state at the water outlet is achieved. Meanwhile, a water facing reverse arc-shaped absorption surface is arranged on the front surface of the oblique angle conduit diversion absorption pier, partial water flow at the water outlet is opposite to the arc-shaped absorption surface to generate whirl, so that energy dissipation is increased, and the other part of water flow passes through the absorption pier to form whirl and roll, so that energy dissipation can be realized.
The circular steering flow hole with variable diameter is arranged on the flow guiding inclined plane and the water facing surface, the water inlet is provided with a larger water inlet, the water outlet is provided with a smaller water outlet, the water inlet efficiency can be improved based on the arrangement, the flow velocity of the outflow water flow can be improved through the smaller water outlet, the effective flow cross section area of the low flow velocity area is reduced, and the energy dissipation efficiency is improved.
When the angle of the chamfer side face is 45 degrees, partial water flow collides with the chamfer side face to turn, and the outflow flow rate is adjusted in the horizontal direction. When the inclination is too large, the water flow can only pass through the power dissipation piers to form rotary rolling so as to achieve the purpose of energy dissipation, and the outflow flow velocity in the horizontal direction can not be adjusted.
Example 2
As shown in FIG. 7, 11 is the original building water outlet, 12 is the extended hydraulic building water outlet, 13 is the stilling pool, 14 is the outflow flow velocity schematic arrow, and 17 is the oblique angle conduit turning stilling pier of the invention. In the stilling pool, oblique angle guide pipes are arranged at the water outlet of the high flow velocity zone, quincuncial arrangement is adopted in the transverse direction and the longitudinal direction of the stilling pool, and the stilling piers are arranged from left to right from low to high in the vertical direction. The net distance of the force dissipating piers is 0.75 times of the height of the piers, the force dissipating piers are adjusted according to the flow rate of the water outlet, and when the ratio of the flow rate of the high flow rate area to the flow rate of the low flow rate area is 1.5, the net distance of the force dissipating piers is 0.75 times.
Based on the arrangement, the left force dissipating pier can not obstruct the flow guiding of the right force dissipating pier. The water flow in the high flow velocity area can smoothly flow into the low flow velocity area to perform turbulent fluctuation energy dissipation. And the high flow velocity area and the low flow velocity area are subjected to energy dissipation coupling, so that the flow velocity at the water outlet is homogenized and reduced.
Comparative example 1
Compared with the oblique angle conduit turning force dissipating pier of the embodiment 1, the proportion of the water facing reverse arc force dissipating surface on the water facing surface is 80%, the structural stability of the force dissipating pier cannot be ensured, and the force dissipating pier cannot be used for a long time. Therefore, the structure is ensured to be stable, and simultaneously, the larger duty ratio is selected as much as possible, so that a better energy dissipation effect is achieved.
Comparative example 2
In comparison with example 2, the flow direction schematic diagram without the force-absorbing pier is shown in fig. 5, wherein 11 is the original building water outlet, 12 is the extended hydraulic building water outlet, 13 is the force-absorbing pond, and 14 is the outflow flow velocity schematic arrow. Because the flow rate at the water outlet of the expanded water building is far greater than that of the original water outlet building, the water flow at the water outlet of the low flow rate region can deviate to the high flow rate region under the pressure of the low flow rate region, thereby causing the phenomena of scouring at one side, silting at one side and large-scale backflow of the downstream river bed.
Comparative example 3
Compared with the embodiment 2, the flow direction schematic diagram of the lengthened high-flow-rate zone stilling pool is shown in fig. 6, wherein 11 is an original water outlet of a building, 12 is an extended hydraulic building water outlet, 13 stilling pools, 14 is an outflow flow-rate schematic arrow, 15 is a lengthened high-flow-rate zone stilling pool, and 16 is a traditional upright post stilling pier. In order to ensure that outflow from two sides is uniformly balanced, a lengthened stilling pool is adopted at a water outlet of a high flow velocity zone, and comprehensive energy dissipation measures of the traditional stilling pier are arranged. The flow velocity of water in the high flow velocity area passes through the lengthened stilling pool, so that the flow velocity can be slowed down, and the flow state is straight after jumping out of the stilling pool. However, in actual engineering, construction cost is increased, and the flow velocity difference of water flows at two sides after jumping out of the stilling pool still exists, and the phenomena of scouring at one side of a downstream riverbed, siltation at one side and large-scale backflow still occur.
Claims (9)
1. The utility model provides an oblique angle pipe diversion pier of absorbing force, includes the cube pier body, wherein, be equipped with concave arc absorbing force face (2) on the upstream face (1) of pier body, the pier body is inside to be equipped with circular diversion guide channel (6), and water inlet (4) of diversion channel (6) are located absorbing force face (2), and delivery port (5) are located chamfer side (3), the internal diameter of water inlet (4) is 0.3-0.35 times pier height, and the internal diameter of delivery port (5) is 0.25-0.3 times pier height, and the diversion hole of high velocity of flow district water flow to absorbing force pier, through the diversion regulating action of pipe, rivers flow from diversion inclined plane side, wash into low velocity of flow district, and the transverse water flow that produces makes the relative effective cross-section area reduction in low velocity of flow district.
2. The pier according to claim 1, characterized in that the absorption surface (2) is 60-70% on the water-facing surface (1).
3. The pier according to claim 1, characterized in that the arc of the damping surface (2) is 140 ° -160 °.
4. The pier according to claim 1, characterized in that the pier height of the pier is 0.15-0.2 times the depth of water, and the center point of the water inlet (4) is 0.5-0.55 times the pier height from the bottom surface of the pier.
5. The pier according to claim 1, characterized in that the beveled side (3) is inclined at an angle of 45 ° -60 °, the beveled edge being 1.1-1.3 times the pier height.
6. A pier according to claim 1, characterized in that the angle of inclination of the back surface (7) is 70 ° -80 °.
7. The pier according to claim 1, characterized in that the long sides of the top surface (9) are 1.2-1.3 times the pier height, the short sides are 0.8-0.9 times the pier length and the width is 0.6-0.7 times the pier height; the long side of the bottom surface (10) is 1.9-2.1 times of pier height, the short side is 0.9-1.0 times of pier height, and the width is 0.8-0.9 times of pier height.
8. An asymmetric outflow coupling energy dissipation method using the pier of claim 1, characterized in that the oblique angle conduit is arranged in a high flow velocity area in a staggered manner, and the distance between the pier is 0.5-0.75 times of pier height.
9. The method of claim 8, wherein the displacement arrangement of the power take-off piers is such that when the ratio of the flow rate in the high flow rate region to the flow rate in the low flow rate region is 1-2, the pitch of the power take-off piers is 0.6-0.75 times the height of the piers, or when the ratio of the flow rate in the high flow rate region to the flow rate in the low flow rate region is greater than 2, the pitch of the power take-off piers is 0.5-0.6 times the height of the piers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211045320.XA CN115323998B (en) | 2022-08-30 | 2022-08-30 | Oblique angle conduit diversion dissipating pier and asymmetric outflow coupling energy dissipation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211045320.XA CN115323998B (en) | 2022-08-30 | 2022-08-30 | Oblique angle conduit diversion dissipating pier and asymmetric outflow coupling energy dissipation method |
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| CN115323998A CN115323998A (en) | 2022-11-11 |
| CN115323998B true CN115323998B (en) | 2024-01-23 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1476051A1 (en) * | 1987-01-23 | 1989-04-30 | Всесоюзный Научно-Исследовательский Институт Водоснабжения, Канализации, Гидротехнических Сооружений И Инженерной Гидрогеологии "Водгео" | Arrangement for dampening water stream energy in lower pownd of hydraulic structures |
| CN107964928A (en) * | 2017-10-31 | 2018-04-27 | 四川大学 | A kind of baffle pier structure using limbers deduction and exemption cavitation erosion |
| CN207904886U (en) * | 2017-11-20 | 2018-09-25 | 河海大学 | A kind of hollow baffle pier |
| CN109339006A (en) * | 2018-12-05 | 2019-02-15 | 张迈 | A kind of efficient bevel-type waterpower stilling pool slab and its construction method |
-
2022
- 2022-08-30 CN CN202211045320.XA patent/CN115323998B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1476051A1 (en) * | 1987-01-23 | 1989-04-30 | Всесоюзный Научно-Исследовательский Институт Водоснабжения, Канализации, Гидротехнических Сооружений И Инженерной Гидрогеологии "Водгео" | Arrangement for dampening water stream energy in lower pownd of hydraulic structures |
| CN107964928A (en) * | 2017-10-31 | 2018-04-27 | 四川大学 | A kind of baffle pier structure using limbers deduction and exemption cavitation erosion |
| CN207904886U (en) * | 2017-11-20 | 2018-09-25 | 河海大学 | A kind of hollow baffle pier |
| CN109339006A (en) * | 2018-12-05 | 2019-02-15 | 张迈 | A kind of efficient bevel-type waterpower stilling pool slab and its construction method |
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| CN115323998A (en) | 2022-11-11 |
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