CN108517843B - Overflow weir and elastic force type stilling basin combined energy dissipation structure and energy dissipation method - Google Patents
Overflow weir and elastic force type stilling basin combined energy dissipation structure and energy dissipation method Download PDFInfo
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- CN108517843B CN108517843B CN201810287316.1A CN201810287316A CN108517843B CN 108517843 B CN108517843 B CN 108517843B CN 201810287316 A CN201810287316 A CN 201810287316A CN 108517843 B CN108517843 B CN 108517843B
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention discloses an overflow weir and elastic stilling pool combined energy dissipation structure and an energy dissipation method, which comprise an overflow weir and a stilling pool, wherein the overflow weir comprises a WES straight line section and a WES arc-shaped section, the WES straight line section is connected with the WES arc-shaped section, a rotating shaft component is arranged at the joint of the WES straight line section and the WES arc-shaped section, a hydraulic jacking device is arranged at the bottom of the tail of the WES arc-shaped section, the tail of the WES arc-shaped section of the overflow weir is connected with the stilling pool, the stilling pool comprises a stilling pool head part, a stilling pool middle part and a stilling pool tail part, the tail of the WES arc-shaped section of the overflow weir is connected with the stilling pool head part, and more than one rubber support is arranged under the bottom plates of the stilling pool head part, the stilling; the ascending height of the hydraulic jacking device is adjusted, so that the height difference between the WES reverse arc section of the overflow weir and the head of the stilling pool is adjusted, the purpose of energy dissipation is achieved, and when the device is poured, rubber supports are arranged below the head of the stilling pool, the middle of the stilling pool and the bottom plate at the tail of the stilling pool, and energy dissipation is also performed.
Description
Technical Field
The invention relates to a combined energy dissipation structure and method of an overflow weir and a resilient stilling basin, and belongs to the field of flood discharge and energy dissipation of hydraulic buildings in hydraulic and hydroelectric engineering.
Background
In dam engineering design, flood discharge and energy dissipation are two tasks borne by a water discharge building, namely, the flushing of a dam body and a downstream foundation pit by a downward discharge water flow is strictly controlled while redundant flood is safely released, and the dam body damage and the dam foundation instability are prevented. Especially for high-water-head and large-flow flood discharge projects, the problems of large bottom-adjacent flow velocity and pulsating pressure of a bottom plate, high impact protection difficulty, large size of a required absorption basin, high manufacturing cost and the like exist, so that the research and the engineering application of the energy dissipation form are always limited.
Aiming at the traditional energy dissipater, a stepped overflow dam is introduced for energy dissipation, and is combined with a flaring pier and a stilling basin to form an integrated energy dissipation facility, the energy dissipation form has the advantages of flaring pier energy dissipation and stepped overflow dam energy dissipation, the energy dissipation rate of the flaring pier is further improved by utilizing a stepped overflow surface, and cavitation damage are avoided by utilizing the ventilation of a water-free area behind the flaring pier from the bottom of a water tongue to the stepped dam surface, so that the stepped overflow dam is developed towards the direction of high water head large single width flow.
Although the research on the energy dissipation mechanism of the combination energy dissipation form of the flaring pier and the stepped overflow dam is relatively sufficient, under the conditions of high water head and large single flow, the water depth on the stepped surface is increased, the aeration condition is lacked at the bottom, the huge energy cannot be eliminated only by the friction resistance of the steps, and the dam surface can be seriously damaged by cavitation. In order to reduce or eliminate the negative pressure of the step surface, aeration conditions need to be created for the bottom of the nappe, and the aeration cavity and the aeration concentration are increased, so that the cavitation erosion reduction and prevention strength is enhanced. Therefore, in practical engineering application, a preposed aerator is often arranged at the joint of the WES reverse arc section below the flaring pier and the stilling pool so as to increase the aeration effect and change the water flow characteristic and the energy dissipation characteristic.
Common energy dissipation forms of the stilling basin are divided into two types: one is that the WES reverse arc section is tangent with the stilling pool, then the pool bottom with different height difference is generated in the stilling pool to increase the rotating roll of water flow, and the other is that a certain height difference exists between the tail part of the WES reverse arc section and the head part of the stilling pool, and the height difference is directly utilized to form a form of aeration drop sill. However, the transition connection mode of the two methods is selected only by depending on engineering design experience, and the connection mode has no optimal result on the influence of the water flow state, the aeration characteristic, the pressure distribution, the cavitation erosion, the energy dissipation mechanism and the like of the dam surface and the proper height difference among the two methods.
From the technical point of view, because the underflow stilling pool carries out energy dissipation through large-scale hydraulic jump, the turbulence of water flow is strong, the energy dissipation is mainly concentrated in the front half area of the stilling pool, the load borne by the bottom plate of the stilling pool in the area is often concentrated, the bottom-adjacent flow velocity is high, the preliminary estimation is carried out, and when the difference between the water levels of the upstream and the downstream is higher than 60m, the maximum bottom-adjacent flow velocity of the stilling pool can reach more than 30 m/s. Under the condition of high water head and large flow, the scheme of the bottom flow stilling pool is adopted, and the instability and damage of a bottom plate block of the stilling pool are easily caused due to higher hydraulic indexes such as near-bottom flow velocity, pulsating pressure and the like. The main failure modes are: (1) the high-speed water flow can directly induce cavitation erosion damage of the bottom plate; (2) cavitation and cavitation damage appear after the abrasion of the high-speed sand-containing water flow to the stilling pool develops to a certain degree; (3) after the water stopping among the plates is damaged due to the pulsating load, the instability and the damage of the plates are caused by the transmission of the water pressure of the high-speed water flow; (4) the strong pulsating load directly causes the instability and damage of the plate in the moment. The four failure modes are all appeared in the built projects at home and abroad, and the field investigation and the analytical research show that the failure reasons of the projects are different, but the failure modes are directly related to the overhigh hydraulic index of the near bottom of the stilling pool. Therefore, a great technical risk still exists by adopting an underflow energy dissipation mode under the condition of high water head and large flow.
Disclosure of Invention
The invention provides a combined energy dissipation structure of an overflow weir and an elastic type stilling pool and an energy dissipation method, aiming at the problems of insufficient aeration in the current flow-discharging energy dissipation design of a hydraulic structure, low energy dissipation efficiency of the stilling pool, overlarge pressure intensity of a stilling pool bottom plate and the like.
The technical scheme of the invention is as follows: the utility model provides an overflow weir and elastic formula absorption basin combined energy dissipation structure, includes overflow weir and absorption basin, the overflow weir includes WES straightway and WES arc-shaped section, the WES straightway with the WES arc-shaped section is connected, and is equipped with the pivot part in the junction, the afterbody bottom of WES arc-shaped section is equipped with hydraulic pressure jacking device, the afterbody of overflow weir WES arc-shaped section with the absorption basin is connected, the absorption basin includes absorption basin prelude, absorption basin middle part and absorption basin afterbody, the afterbody of overflow weir WES arc-shaped section with the absorption basin prelude is connected, all be equipped with more than one rubber support under the bottom plate of absorption basin prelude, absorption basin middle part and absorption basin afterbody.
The rotating shaft part comprises an outer rotating shaft, a rotating column, an inner rotating shaft, an upper blade, blade holes, a lower blade and more than one fixing column, the outer rotating shaft is positioned at the outer side of the inner rotating shaft, the outer rotating shaft comprises an upper part and a lower part, the rotating column is arranged between the top part, the bottom part and the middle part of the outer rotating shaft and the inner rotating shaft, the upper blade and the lower blade are respectively provided with more than one blade hole, the upper blade and the lower blade are respectively poured at two sides of the outer rotating shaft, the rotating shaft part is directly installed at the connecting part of the WES straight line section and the WES arc-reflecting section when poured, the upper blade is made of steel and is installed inside the tail part of the WES straight line section when poured, the fixing column made of steel penetrates through the blade holes to be anchored so as to ensure that the upper blade cannot slide relative to the tail part of the WES straight line section, and the lower blade is poured at, and the fixing column penetrates through the blade hole for anchoring.
The hydraulic jacking device comprises a hydraulic pump, a main hydraulic cylinder, more than one auxiliary hydraulic cylinder, a pressure control valve, a jacking column and a pipeline; the hydraulic pump is arranged in the main hydraulic cylinder, the main hydraulic cylinder is communicated with more than one auxiliary hydraulic cylinders through pipelines, and the auxiliary hydraulic cylinders are provided with jacking columns. The hydraulic pump is a power part, the main hydraulic cylinder and the auxiliary hydraulic cylinder are execution parts, the volume reduction in the main hydraulic cylinder enables the volume of the auxiliary hydraulic cylinder to be increased so as to enable the lifting column to ascend, the volume increase in the main hydraulic cylinder enables the volume of the auxiliary hydraulic cylinder to be reduced so as to enable the lifting column to descend, the pressure control valve is a control part and mainly controls the telescopic length of the lifting column, the lifting column is a lifting part and adjusts the lifting of the tail part of the WES reverse arc section, and the pipeline is an auxiliary part and is used for connecting the main hydraulic cylinder and the auxiliary hydraulic cylinder, a joint, a control instrument panel and the like.
The rubber support comprises more than one rubber support ring, more than one steel plate support ring and more than one support column; the bottom of each rubber bearing ring is a steel plate bearing ring, the bottom of more than one supporting column penetrates through the rubber bearing rings and the steel plate bearing rings and is anchored in the deep position of a foundation so as to ensure the stability of the rubber bearing, the top of the rubber bearing is also anchored in the same way so as to ensure that the rubber base and the stilling pool bottom plate cannot move relatively, and the top of more than one supporting column is anchored on the stilling pool bottom plate.
The arrangement density of the rubber supports under the bottom plates at the head part, the middle part and the tail part of the stilling pool is that the head part is larger than the middle part and the tail part of the stilling pool. The arrangement of the number of the rubber supports under the bottom plate at the head part, the middle part and the tail part of the stilling pool is organized and assembled according to the actual engineering condition.
The height difference between the WES arc-shaped section of the overflow weir and the head part of the stilling pool is adjusted by adjusting the rising height of the hydraulic jacking device for weir-passing water flow with different flow rates during drainage, so that the purpose of energy dissipation is achieved, and more than one rubber support is arranged under the head part of the stilling pool, the middle part of the stilling pool and the bottom plate at the tail part of the stilling pool during pouring, so that energy dissipation is also performed.
Single wide flow of water flow passing weir crest<170m3When the pressure is in the range of the bottom flow energy dissipation, the hydraulic pump of the hydraulic jacking device is adjusted to enable the hydraulic pump to ascend, so that the volume in the main hydraulic cylinder is increased, the volume in the auxiliary hydraulic cylinder is reduced, the jacking column is enabled to descend until the height of the WES reverse arc section is lower than the head of the stilling pool, a falling sill with a certain height difference is formed between the WES reverse arc section and the head of the stilling pool, the aeration concentration in the bottom flow energy dissipation process is increased, and the rotating roll of water flow at the connecting part is strengthened, so that the purpose of energy dissipation is achieved;
when the single width flow of the weir crest crossing the weir flow is 170m3/s·m~195m3When in the range of/s.m, the hydraulic pump of the hydraulic jacking device is adjusted to enable the hydraulic pump to descend, so that the volume in the main hydraulic cylinder is reduced, the volume in the auxiliary hydraulic cylinder is increased, the jacking column is enabled to ascend, the height of the WES reverse arc section is the same as the height of the head part of the stilling pool, water flow can be enabled to be more stably transited into the stilling pool, the protection slopes at two banks are protected from being damaged, the dynamic water pressure of the head part bottom plate of the stilling pool can be reduced to a certain extent, and the stability of the head part bottom plate of the stilling pool is facilitated.
When the weir crest passes the weir water flow, the single width flow is 195m3/s·m—220m3When the flow rate is in the range of s.m, the hydraulic pump of the hydraulic lifting device is adjusted to lower the hydraulic pump, so that the volume in the main hydraulic cylinder is reduced, the volume in the auxiliary hydraulic cylinder is increased, so that the lifting column is lifted, and at the same time, the pressure control valve is adjusted to raise the lifting column to a height higher than the single width flow rate and 170m3/s·m~195m3The rising height of the jacking column at/s.m is to make the height of the WES reverse arc section higher than that of the head part of the stilling pool, and the maximum value of the hydrodynamic pressure is mostly concentrated in the head part of the stilling pool and the middle part of the stilling pool in the range, so the pressure borne by the rubber base under the bottom plate of the head part of the stilling pool and the middle part of the stilling pool is maximum, the height difference between the head part of the stilling pool and the middle part of the stilling pool is maximum, and the height difference between the middle part of the stilling pool and the tail part of the stilling pool is correspondingly reduced due to the reduction of the pressure, so the head part of theThe height difference between the middle part and the tail part of the stilling pool enables water flow to rotate and roll in the stilling pool to a certain degree, so that the kinetic energy of the water flow is reduced, and the purpose of energy dissipation is achieved;
when the weir crest passes through the weir water flow, the single width flow is>220m3At the time of/s.m, it is necessary to perform higher energy dissipation in the stilling pool, and at this time, the hydraulic pump of the hydraulic jack is adjusted to lower the hydraulic pump, thereby reducing the volume in the main hydraulic cylinder and increasing the volume in the sub hydraulic cylinder, thereby raising the jack-up column, and at the same time, the pressure control valve is adjusted to raise the jack-up column higher than the single width flow rate of 195m3/s·m~220m3The lifting height of the lifting column is higher than the height of the head part of the stilling pool when the lifting column rises in the/s.m, the maximum value of the dynamic water pressure is mostly concentrated at the tail end of the middle part of the stilling pool and the head end of the tail part of the stilling pool in the range, so that the head part of the stilling pool and the middle part of the stilling pool can descend to a certain degree, the height difference between the head part of the stilling pool and the tail part of the stilling pool can be correspondingly reduced, and the height difference between the middle part of the stilling pool and the tail part of the stilling pool can be correspondingly increased due to the increase of the middle pressure and the increase of the pressure caused by water blocking, so that the water flow can be rotated and collided to a higher degree in the stilling pool due to the height difference between the head part of the stilling pool, the middle part of the stilling pool and the tail part of.
The invention has the beneficial effects that:
(1) the invention improves the energy consumption rate of each level of flow to a great extent by optimizing the two aspects of different height differences of the bottom of the WES reverse arc section and the head, the middle and the tail of the elastic force type stilling pool.
(2) The invention increases the aeration concentration of the WES reverse arc section and the head end of the stilling pool, increases the buffering effect of water flow on each part of the stilling pool by the rotary rolling of the water flow in the stilling pool, and has obvious energy dissipation effect.
(3) The height difference of different degrees caused by different pressures born by each part of the stilling pool during the drainage can change the water flow state in the stilling pool, and the pulsation load of the bottom plate and the energy dissipation efficiency of the stilling pool are improved.
(4) The impact pressure on the bottom of the absorption basin caused by different weir-passing flows has buffer effect of different degrees due to the arrangement of the rubber base, and is favorable for protecting the stability of the bottom of the absorption basin.
(5) The invention improves the atomization phenomenon generated during the drainage and ensures that the water flow out of the pool is more stable.
Drawings
FIG. 1 is a schematic elevational view of the overall structure of the present invention;
FIG. 2 is a schematic side view of the overall structure of the present invention;
FIG. 3 is a schematic perspective view of the overall structure of the WES reverse arc segment of the present invention;
FIG. 4 is a schematic perspective view of the overall structure of the stilling pool header of the present invention;
FIG. 5 is a schematic perspective view of the overall structure of the stilling pool of the present invention;
FIG. 6 is a schematic perspective view of the overall structure of the end of the stilling pool of the present invention;
FIG. 7 is a perspective view of the overall structure of the present invention;
FIG. 8 is a schematic view of the structure of the outer shaft, inner shaft and rotary column of the present invention;
FIG. 9 is a schematic view of the upper blade of the present invention;
FIG. 10 is a view showing the overall structure of the rotary shaft according to the present invention;
FIG. 11 is a schematic view showing the overall structure of a rubber mount according to the present invention;
FIG. 12 is a schematic structural view of the whole hydraulic jacking device in the invention;
the reference numbers in the figures are: the hydraulic lifting device comprises a 1-WES straight line section, a 2-WES reverse arc section, a 3-stilling pool head section, a 4-stilling pool middle section, a 5-stilling pool tail section, a 6-rotating shaft part, a 6-1-outer rotating shaft, a 6-2-rotating column, a 6-3-inner rotating shaft, a 6-4-upper blade, a 6-5-blade hole, a 6-lower blade, a 6-7-fixed column, a 7-rubber support, a 7-1-rubber support ring, a 7-2-steel plate support ring, a 7-3-support column, an 8-hydraulic lifting device, an 8-1-hydraulic pump, an 8-2-main hydraulic cylinder, an 8-3-pressure control valve, an 8-4-pipeline, an 8-5-auxiliary hydraulic cylinder and an 8-6-lifting column.
Detailed Description
The invention will be further described with reference to the following figures and examples, without however restricting the scope of the invention thereto.
Example 1: as shown in FIGS. 1 to 12, the combined energy dissipation structure of the overflow weir and the elastic force type stilling pool comprises an overflow weir and a stilling pool, the overflow weir comprises a WES straight-line section 1 and a WES reverse arc section 2, the WES straight-line section 1 is connected with the WES reverse arc section 2, a rotating shaft part 6 is arranged at the joint, a hydraulic jacking device 8 is arranged at the bottom of the tail part of the WES reverse arc section 2, the tail part of the inverted arc section 2 of the overflow weir WES is connected with the stilling pool, the stilling pool comprises a stilling pool head part 3, a stilling pool middle part 4 and a stilling pool tail part 5, the tail part of the inverted arc section of the overflow weir WES is connected with the head part 3 of the absorption basin, the bottom of the absorption basin is provided with rubber supports according to the pressure intensity, and the pressure intensity born by the head part 3 of the absorption basin is 1.5 times of that born by the middle part 4 of the absorption basin, so that the density of the rubber supports arranged below the bottom plate of the head part 3 of the absorption basin is 25 square meters per square meter; the pressure intensity born by the middle part 4 of the stilling pool is about 1.3 times of the pressure intensity born by the tail part 5 of the stilling pool, so that the density of the rubber support arranged under the bottom plate is 37.5 square meters per square meter; for the pressure intensity born by the tail part 5 of the stilling pool, the effect achieved when the density of the rubber support arranged under the bottom plate of the tail part 5 of the stilling pool is 50 square meters per square meter is more ideal.
The rotating shaft part 6 comprises an outer rotating shaft 6-1, a rotating column 6-2, an inner rotating shaft 6-3, an upper blade 6-4, blade holes 6-5, a lower blade 6-6 and 2 fixing columns 6-7, the outer rotating shaft 6-1 is positioned at the outer side of the inner rotating shaft 6-3, the outer rotating shaft 6-1 comprises an upper part and a lower part, the rotating column 6-2 is arranged between the top part, the bottom part and the middle part of the outer rotating shaft 6-1 and the inner rotating shaft 6-3, the upper blade 6-4 and the lower blade 6-6 are respectively provided with 9 blade holes 6-5, the upper blade 6-4 and the lower blade 6-6 are respectively poured at two sides of the outer rotating shaft 6-1, the rotating shaft part 6 is directly installed at the connecting part of the WES straight line section and the WES arc section during pouring, and the upper blade 6-4 is cast at the tail part of the straight line section of the WES and is anchored by a fixing column 6-7 penetrating through a blade hole 6-5, and the lower blade 6-6 is cast at the head part of the reverse arc section of the WES and is anchored by a fixing column 6-7 penetrating through a blade hole 6-5.
The hydraulic jacking device 8 comprises a hydraulic pump 8-1, a main hydraulic cylinder 8-2, 5 auxiliary hydraulic cylinders 8-5, a pressure control valve 8-3, a jacking column 8-6 and a pipeline 8-4; a hydraulic pump 8-1 is arranged in the main hydraulic cylinder 8-2, the main hydraulic cylinder 8-2 is communicated with the 4 auxiliary hydraulic cylinders 8-5 through pipelines 8-4, and jacking columns 8-6 are arranged on the auxiliary hydraulic cylinders 8-5.
The rubber support 7 comprises 2 rubber support rings 7-1, 2 steel plate support rings 7-2 and 2 support columns 7-3; the bottom of each rubber bearing ring 7-1 is a steel plate bearing ring 7-2, the bottoms of the 2 supporting columns 7-3 penetrate through the rubber bearing rings 7-1 and the steel plate bearing rings 7-2 and are anchored in the deep position of a foundation, and the tops of the 2 supporting columns 7-3 are anchored on the bottom plate of the stilling pool.
For weir water flow passing through different flow rates during drainage, the height of the hydraulic jacking device 8 is adjusted, so that the height difference between the inverted arc section 2 of the overflow weir WES and the head part 3 of the stilling pool is adjusted, the purpose of energy dissipation is achieved, and the rubber supports 7 arranged below the bottom plates of the head part 3 of the stilling pool, the middle part 4 of the stilling pool and the tail part 5 of the stilling pool perform energy dissipation during pouring.
The embodiment is mainly used for single wide flow<170m3Energy dissipation is carried out by/s.m, and the specific energy dissipation method comprises the following steps: the hydraulic pump 8-1 of the hydraulic jacking device 8 is adjusted to enable the hydraulic pump 8-1 to ascend, so that the volume in the main hydraulic cylinder 8-2 is increased, the volume in the auxiliary hydraulic cylinder 8-5 is reduced, the jacking column 8-6 descends until the height of the WES reverse arc section 2 is lower than the head part 3 of the stilling pool, a falling ridge with a certain height difference is formed between the WES reverse arc section 2 and the head part 3 of the stilling pool, the aeration concentration in the underflow energy dissipation process is increased, the rotation and rolling of water flow at the connecting part are strengthened, and the purpose of energy dissipation is achieved.
By the method, the energy dissipation efficiency is improved from 8% to 13%.
Example 2: the structure of the embodiment is the same as that of embodiment 1, except that the rubber supports are arranged at the bottom of the stilling pool according to the pressure intensity born by the stilling pool, and the pressure intensity born by the stilling pool head part 3 is larger and is about 1.5 times of that born by the middle part 4 of the stilling pool, so that the density of the rubber supports arranged below the bottom plate of the stilling pool head part 3 is 25 square meters per square meter; the pressure intensity born by the middle part 4 of the stilling pool is about 1.3 times of the pressure intensity born by the tail part 5 of the stilling pool, so that the density of the rubber support arranged under the bottom plate is 37.5 square meters per square meter; for the pressure intensity born by the tail part 5 of the stilling pool, the effect achieved when the density of the rubber support arranged under the bottom plate of the tail part 5 of the stilling pool is 50 square meters per square meter is more ideal.
The embodiment is mainly used for single wide flow of 170m3/s·m~195m3The energy dissipation is carried out by the aid of the pressure sensors/s.m, the hydraulic pump 8-1 of the hydraulic jacking device 8 is adjusted to enable the hydraulic pump 8-1 to descend, so that the volume of the main hydraulic cylinder 8-2 is reduced, the volume of the auxiliary hydraulic cylinder 8-5 is increased, the jacking column 8-6 rises, the height of the WES reverse arc section 2 is the same as that of the head part 3 of the stilling pool, water flow can be more stably transited into the stilling pool, protection slopes at two sides are protected against damage, the dynamic water pressure of the bottom plate of the head part 3 of the stilling pool can be reduced to a certain extent, and the stability of the bottom plate of the head part 3 of the stilling pool is facilitated.
By the method, the energy dissipation efficiency is improved from 9% to 14%.
Example 3: the structure of the embodiment is the same as that of embodiment 1, except that the rubber support is installed at the bottom of the stilling pool according to the pressure intensity, under the condition of the embodiment, the overall pressure intensity of the stilling pool is generally increased, so that the density of the rubber support of the overall stilling pool is correspondingly increased, and the density of the rubber support arranged below the bottom plate of the front part 3 of the stilling pool is 30 square meters per square meter because the pressure intensity borne by the front part 3 of the stilling pool is larger and is about 1.5 times of that borne by the middle part 4 of the stilling pool; the pressure intensity born by the middle part 4 of the stilling pool is about 1.3 times of the pressure intensity born by the tail part 5 of the stilling pool, so that the density of the rubber support arranged under the bottom plate is 45 square meters per square meter; for the pressure intensity born by the tail part 5 of the stilling pool, the effect achieved when the density of the rubber support arranged under the bottom plate of the tail part 5 of the stilling pool is 58.5 square meters per square meter is more ideal.
The embodiment is mainly used for single wide flow of 195m3/s·m—220m3Energy dissipation is carried out by the method of/s.m, and the specific method comprises the following steps: a hydraulic pump 8-1 of the hydraulic jacking device 8 is adjusted,the hydraulic pump 8-1 is lowered to reduce the volume in the master cylinder 8-2 and increase the volume in the sub cylinder 8-5 to raise the lift pin 8-6, and at the same time, the pressure control valve 8-3 is adjusted to raise the lift pin 8-6 to a height higher than the single wide flow rate of 170m3/s·m~195m3The lifting column 8-6 rises at the time of/s.m, so that the height of the WES reverse arc section 2 is higher than that of the stilling pool head part 3, the maximum value of the dynamic water pressure is mostly concentrated on the stilling pool head part 3 and the stilling pool middle part 4 in the range, the pressure borne by the rubber base 7 below the bottom plate of the stilling pool head part 3 and the stilling pool middle part 4 is the maximum, the height difference between the stilling pool head part 3 and the stilling pool middle part 4 is the maximum, and the height difference between the stilling pool middle part 4 and the stilling pool tail part 5 is correspondingly reduced due to the reduction of the pressure intensity, so that the water flow can roll in the stilling pool to a certain degree due to the height difference between the stilling pool head part 3, the stilling pool middle part 4 and the stilling pool tail part 5, thereby reducing the kinetic energy of the water flow and achieving the purpose of energy dissipation.
By the method, the energy dissipation efficiency is improved from 7.2% to 12.3%.
Example 4: the structure of the embodiment is the same as that of embodiment 1, except that the rubber support is installed at the bottom of the stilling pool according to the pressure intensity, under the condition of the embodiment, the overall pressure intensity of the stilling pool is generally increased, so that the density of the rubber support of the overall stilling pool is correspondingly increased, and the density of the rubber support arranged below the bottom plate of the front part 3 of the stilling pool is 28 square meters per square meter because the pressure intensity borne by the front part 3 of the stilling pool is larger and is about 1.5 times of that borne by the middle part 4 of the stilling pool; the pressure intensity born by the middle part 4 of the stilling pool is about 1.3 times of the pressure intensity born by the tail part 5 of the stilling pool, so that the density of the rubber support arranged under the bottom plate is 42 square meters per square meter; for the pressure intensity born by the tail part 5 of the stilling pool, the effect achieved when the density of the rubber support arranged under the bottom plate of the tail part 5 of the stilling pool is 54.6 square meters per square meter is more ideal.
The embodiment is mainly used for single wide flow>220m3Energy dissipation is carried out by the method of/s.m, and the specific method comprises the following steps: when the weir crest passes through the weir water flow, the single width flow is>220m3In the case of/s.m, a higher level of energy dissipation is required in the stilling basin, and at this time, the hydraulic pump 8-1 of the hydraulic jack-up device 8 is adjusted,the hydraulic pump 8-1 is lowered to reduce the volume in the master cylinder 8-2 and increase the volume in the sub cylinder 8-5 to raise the lift pin 8-6, and at the same time, the pressure control valve 8-3 is adjusted to raise the lift pin 8-6 to a height higher than the single wide flow rate of 195m3/s·m~220m3The lifting columns 8-6 rise at the time of/s.m, so that the height of the WES reverse arc section 2 is higher than that of the stilling pool head part 3, the maximum value of the dynamic water pressure is mostly concentrated at the tail end of the stilling pool middle part 4 and the head end of the stilling pool tail part 5 in the range, so that the stilling pool head part 3 and the stilling pool middle part 4 are descended to a certain degree, the height difference between the stilling pool middle part 4 and the stilling pool tail part 5 is correspondingly reduced, and the height difference between the stilling pool middle part 4 and the stilling pool tail part 5 is correspondingly increased due to the increase of the middle pressure and the increase of the pressure caused by water blocking, so that the water flow can be rotated and collided to a higher degree in the stilling pool due to the height difference between the stilling pool head part 3, the stilling pool middle part 4 and the stilling pool tail part 5, thereby reducing the kinetic energy of the water flow and achieving the purpose of.
By the method, the energy dissipation efficiency is improved from 7% to 11%.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. A combined energy dissipation structure of an overflow weir and a resilient stilling basin is characterized by comprising an overflow weir and a stilling basin, the overflow weir comprises a WES straight section (1) and a WES reverse arc section (2), the WES straight section (1) is connected with the WES reverse arc section (2), a rotating shaft part (6) is arranged at the joint, a hydraulic jacking device (8) is arranged at the bottom of the tail part of the WES reverse arc section (2), the tail part of the inverted arc section (2) of the overflow weir WES is connected with the stilling pool, the stilling pool comprises a stilling pool head part (3), a stilling pool middle part (4) and a stilling pool tail part (5), the tail part of the inverted arc section of the overflow weir WES is connected with the head part (3) of the stilling pool, more than one rubber support (7) is arranged under the bottom plates of the stilling pool head part (3), the stilling pool middle part (4) and the stilling pool tail part (5);
the rotating shaft component (6) comprises an outer rotating shaft (6-1), rotating columns (6-2), an inner rotating shaft (6-3), upper blades (6-4), blade holes (6-5), lower blades (6-6) and more than one fixing column (6-7), the outer rotating shaft (6-1) is positioned on the outer side of the inner rotating shaft (6-3), the outer rotating shaft (6-1) comprises an upper part and a lower part, the rotating columns (6-2) are respectively arranged between the top part, the bottom part and the middle part of the outer rotating shaft (6-1) and the inner rotating shaft (6-3), the upper blades (6-4) and the lower blades (6-6) are respectively provided with more than one blade hole (6-5), and the upper blades (6-4) and the lower blades (6-6) are respectively poured on two sides of the outer rotating shaft (6-1), the rotating shaft component (6) is directly installed at the connecting position of the WES straight line section and the WES reverse arc section during pouring, the upper blade (6-4) is poured at the tail of the WES straight line section and is anchored by a fixing column (6-7) penetrating through a blade hole (6-5), and the lower blade (6-6) is poured at the head of the WES reverse arc section and is anchored by the fixing column (6-7) penetrating through the blade hole (6-5).
2. The overflow weir and elastic stilling pool combined energy dissipation structure of claim 1, wherein: the hydraulic jacking device (8) comprises a hydraulic pump (8-1), a main hydraulic cylinder (8-2), more than one auxiliary hydraulic cylinder (8-5), a pressure control valve (8-3), a jacking column (8-6) and a pipeline (8-4); the hydraulic pump (8-1) is arranged in the main hydraulic cylinder (8-2), the main hydraulic cylinder (8-2) is communicated with the more than one auxiliary hydraulic cylinders (8-5) through pipelines (8-4), and the auxiliary hydraulic cylinders (8-5) are provided with jacking columns (8-6).
3. The overflow weir and elastic stilling pool combined energy dissipation structure of claim 1, wherein: the rubber support (7) comprises more than one rubber support ring (7-1), more than one steel plate support ring (7-2) and more than one support column (7-3); the bottom of each rubber bearing ring (7-1) is a steel plate bearing ring (7-2), the bottom of more than one supporting column (7-3) penetrates through the rubber bearing rings (7-1) and the steel plate bearing rings (7-2) and is anchored in the deep position of a foundation, and the top of more than one supporting column (7-3) is anchored on the stilling pool bottom plate.
4. The overflow weir and elastic stilling pool combined energy dissipation structure of claim 1, wherein: the arrangement density of the rubber support (7) under the bottom plate of the stilling pool head part (3), the stilling pool middle part (4) and the stilling pool tail part (5) is that the stilling pool head part (3) is greater than the stilling pool middle part (4) is greater than the stilling pool tail part (5).
5. An energy dissipation method of a combined energy dissipation structure as claimed in claim 2, comprising the specific steps of:
the height difference between the inverted arc section (2) of the overflow weir WES and the head part (3) of the stilling pool is adjusted by adjusting the rising height of the hydraulic jacking device (8) for weir passing water flow with different flow during drainage, so that the purpose of energy dissipation is achieved, and more than one rubber support (7) arranged below the bottom plates of the head part (3) of the stilling pool, the middle part (4) of the stilling pool and the tail part (5) of the stilling pool also dissipate energy during pouring.
6. An energy dissipation method of a combined energy dissipation structure according to claim 5, characterized in that: single wide flow of water flow passing weir crest<170m3When the WES is in the second position, a hydraulic pump (8-1) of the hydraulic jacking device (8) is adjusted to enable the hydraulic pump (8-1) to ascend, so that the volume in the main hydraulic cylinder (8-2) is increased, the volume in the auxiliary hydraulic cylinder (8-5) is reduced, the jacking column (8-6) descends until the height of the WES arc-reflecting section (2) is lower than the head part (3) of the stilling pool, and energy dissipation is carried out.
7. An energy dissipation method of a combined energy dissipation structure according to claim 5, characterized in that: when the single width flow of the weir crest crossing the weir flow is 170m3/s·m~195m3When the pressure is in the range of/s.m, the hydraulic pressure is adjustedAnd a hydraulic pump (8-1) of the jacking device (8) enables the hydraulic pump (8-1) to descend, so that the volume in the main hydraulic cylinder (8-2) is reduced, the volume in the auxiliary hydraulic cylinder (8-5) is increased, the jacking column (8-6) is lifted, the height of the WES reverse arc section (2) is the same as that of the head part (3) of the stilling pool, and energy dissipation is carried out.
8. An energy dissipation method of a combined energy dissipation structure according to claim 5, characterized in that: when the weir crest passes the weir water flow, the single width flow is 195m3/s·m—220m3When the flow rate is in the range of/s.m, a hydraulic pump (8-1) of a hydraulic jacking device (8) is adjusted, the hydraulic pump (8-1) is made to descend, so that the volume in a main hydraulic cylinder (8-2) is reduced, the volume in an auxiliary hydraulic cylinder (8-5) is increased, so that a jacking column (8-6) is lifted, and meanwhile, a pressure control valve (8-3) is adjusted, so that the lifting column (8-6) is lifted to a height higher than the single width flow rate and is 170m3/s·m~195m3The lifting height of the jacking columns (8-6) is higher than the height of the head part (3) of the stilling pool at the time of/s.m, so that the energy dissipation is carried out.
9. An energy dissipation method of a combined energy dissipation structure according to claim 5, characterized in that: when the weir crest passes through the weir water flow, the single width flow is>220m3At the time of/s.m, higher energy dissipation needs to be carried out in the stilling pool, at the moment, a hydraulic pump (8-1) of a hydraulic jacking device (8) is adjusted, the hydraulic pump (8-1) is made to descend, so that the volume in a main hydraulic cylinder (8-2) is reduced, the volume in an auxiliary hydraulic cylinder (8-5) is increased, so that a jacking column (8-6) is lifted, and meanwhile, a pressure control valve (8-3) is adjusted, so that the lifting height of the jacking column (8-6) is higher than the single width flow rate and is 195m3/s·m~220m3The lifting height of the jacking columns (8-6) is higher than the height of the head part (3) of the stilling pool at the time of/s.m, so that the energy dissipation is carried out.
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