CN206220046U - A kind of flip trajectory bucket experimental rig for being applied to cushion pool - Google Patents

Abstract

The utility model relates to a deflection energy dissipation test device applied to a pad pond, comprising a water circulation system, an overflow system and an energy dissipation system. The water circulation system is composed of a downstream water collection tank, a return pipe, a lower water collection tank, a water pump, an upper water pipe and an upper water collection tank; The energy dissipation system includes the bottom plate of the water cushion pond, the slopes on both sides, the horizontal horseway, the second dam, the granular block and the downstream stilling pond, the water body in the water cushion pond and the accumulation of granular rocks The formed anti-shock system jointly dissipates energy. The utility model provides a device for studying the mechanism of energy dissipation and anti-scouring of bulk rock deposits in a water cushion pond and the influence of factors such as the shape, particle size, and bulk density of the bulk on the energy dissipation effect, and is also used in bulk Under the action of hydraulic scouring, the relationship between the stability of the accumulation system and the porosity and stress distribution of the granular accumulation body and other related scientific research and the energy dissipation experiment teaching of the water cushion pond.

Description

A deflection energy dissipation test device applied to a pad pond

technical field

The utility model relates to a deflecting flow energy dissipation test device applied to a pad pond, belonging to the technical field of high dam flood discharge energy dissipation.

Background technique

In recent years, with the implementation of the country's western development strategy and the strategy of power transmission from west to east, a number of 200-300m high dams have been built in the western alpine and valley areas. These projects generally have the characteristics of high water head and large flow, which increases the difficulty of the layout of drainage structures. Therefore, the problem of high dam energy dissipation is the focus and difficulty of energy dissipation engineering research.

At present, high arch dams mostly adopt the energy dissipation method of deflecting flow and adding water pads. In actual engineering, the scour pits naturally formed in the downstream river bed or artificially built water cushion ponds are often used to form water cushions of a certain thickness and volume to dissipate the energy of water falling into the downstream river channel, and at the same time rely on the scour pits or the anti-scour layer at the bottom of the water cushion ponds Bottom protection to achieve the purpose of anti-shock. As the understanding of the energy dissipation mechanism and scouring characteristics of the water cushion pond continues to deepen, some scholars try to use the water body in the water cushion pond and the anti-scour system composed of loose rock accumulations to jointly dissipate energy. This energy dissipation method is A certain amount of granular rocks are placed in the pad pond, and a part of energy is consumed when the high-speed water tongue discharged through the overflow dam impacts the rough surface of the granular rocks, and part of the kinetic energy of the water flow is transferred to the granular rocks, making the granular rocks The bodies collide and rub against each other, converting kinetic energy into heat energy consumption. At the same time, the water flow generates turbulence in the channel between the granular blocks, accompanied by a large amount of air incorporation, between the water flow, the water flow and the granular blocks And the collision and mixing between the water flow and the air consumes a lot of energy. Since it is still impossible to accurately establish the numerical model of the natural accumulation of granular rocks, the exploration of this new energy dissipation method is mainly through experimental research, and some results have been obtained so far. The simple, practical, economical and reasonable new anti-scouring bottom protection method has laid the foundation.

Utility model content

In order to further study the energy dissipation and anti-scouring mechanism of granular accumulations in the pond and provide experimental conditions for related scientific research and teaching, it is necessary to design and manufacture a deflection energy dissipation test device applied to the pond.

In order to solve the above-mentioned technical problems, the utility model proposes the following technical solutions: a deflection energy dissipation test device applied to a pad pond, which includes a water circulation system, an overflow system and an energy dissipation system, and the water circulation system is used for testing Provide a continuous and stable circulating water flow to meet the water supply requirements of the test; the overflow system is used to provide a stable jet water flow for the test; the energy dissipation system simulates the terrain on both sides of the pad pond in the actual project, and uses The anti-scour system composed of the water body in the pad pond and the accumulation of loose grains of rocks jointly dissipates energy.

The water circulation system includes a downstream sump, the downstream sump communicates with the inlet of the return pipe through the return pipe, and communicates with the stilling pond downstream of Erdaoba, the inlet of the return pipe is located on the bottom plate of the sump, and the return The outlet of the water pipe is located on the side wall of the lower water collecting tank and communicated with each other; the top of the lower water collecting tank is equipped with a water pump, the water inlet of the upper water pipe of the upper water pipe is connected with the water pump, and the water outlet of the upper water pipe is connected with the bottom of the upper water collecting tank; the upper water collecting tank is used The steady-flow baffle and the steady-flow orifice are spaced apart, and the water outlet of the upper water collection tank communicates with the water inlet formed by the side pier of the overflow system and the curved section of the dam crest; the frame-shaped support supports the upper water collection tank and fixes the water pump, and the upper water collection tank There is a top cover.

The overflow system includes a middle pier, the pier head and pier tail of the middle pier are semicircular, the upstream and downstream ends of the side pier on both sides are 1/4 circular, and the curved sections of the side pier and weir crest are in line with the upper set The water outlets of the water tanks are connected, and the water flows from the top curved section along the dam surface to form a surface flow; the top curve type of the overflow weir adopts the WES curve, and the middle straight section is smoothly connected with the top curved section and the lower anti-arc section, and the lower anti-arc section It is also smoothly connected with the horizontal nose sill section, and the water flows through the nose sill section to form a jet stream, which falls into the downstream water cushion pond.

The energy dissipation system includes the bottom plate of the water cushion pond, the slopes on both sides, the horizontal horseway, the second dam, the granular blocks in the water cushion pond and the downstream stilling pond; the bottom plate of the water cushion pond is a horizontal bottom plate with A slope with a certain slope rate, and horizontal horseways are respectively set; the upstream slope surface of the Erdaoba is perpendicular to the bottom plate, and the downstream slope surface is a slope surface with a certain slope rate; the granular blocks are randomly placed in the water cushion pond.

In the energy dissipation system, the second dam and the slopes on both sides of the downstream form a stilling pond, which performs secondary energy dissipation on the projecting water flow.

The utility model provides a test device for dissipating energy and preventing scour in a pad pond by using granular accumulation bodies, which has the following beneficial effects:

The utility model considers the terrain conditions on both sides of the water cushion pond in the actual project, and sets the two sides of the water cushion pond as slopes with a certain slope rate, and respectively sets horizontal horse paths to form a composite trapezoidal cross section with a large upper part and a smaller lower part. Make the test more in line with the actual situation and increase the reliability of the test results.

The energy dissipation system in the utility model simulates the energy dissipation method of the water body in the pad pond and the anti-shock system composed of the bulk rock deposits, and is used for the research on the energy dissipation and prevention of the bulk rock deposits in the pad ponds. It can also be applied to the experimental teaching of water conservancy engineering related majors to strengthen students' understanding of new energy dissipation and anti-scouring methods.

The bulk stones put in the water cushion pond of the utility model can adopt samples of different materials, shapes and sizes, and provide device conditions for studying the influence of the bulk density, shape, particle size and other factors of the granular body on the energy dissipation effect.

The device of the utility model can also be applied to related studies on the relationship between the stability of the accumulation system and the porosity and stress distribution of the granular accumulation body under the action of hydraulic scouring.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the perspective view of the utility model

Fig. 2 is a main sectional view of the utility model.

Fig. 3 is a perspective view of the utility model.

In the figure: 4 Downstream water collection tank, 5 Water return pipe inlet, 6 Water return pipe, 7 Return water pipe outlet, 8 Lower water collection tank, 9 Upper water pipe, 10 Upper water pipe inlet, 11 Water pump, 12 Upper water pipe outlet, 13 Frame bracket, 14 Upper water collection tank, 15 steady flow baffle, 16 steady flow orifice, 17 upper water outlet of water collection tank, 18 top cover of water tank, 19 side pier, 20 middle pier, 21 top curve section, 22 middle straight line section, 23 lower anti-arc section, 24 horizontal nose sill section, 25 base plate, 26 slopes on both sides, 27 horizontal horseway, 28 second dam, 30 water cushion pond, 31 downstream stilling pond.

detailed description

Embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

As shown in Fig. 1-3, a deflecting flow energy dissipation test device applied to a pad pond includes a water circulation system, an overflow system and an energy dissipation system, and the water circulation system is used to provide a continuous and stable circulating water flow for the test, Meet the water supply requirements of the test; the overflow system is used to provide a stable flow for the test; the energy dissipation system simulates the terrain on both sides of the pad pond in the actual project, and utilizes the water body and particulates in the pad pond The anti-shock system composed of piled stones jointly dissipates energy.

Further, the water circulation system includes a downstream water collection tank 4, the downstream water collection tank 4 communicates with the return water pipe inlet 5 through the return water pipe 6, and communicates with the stilling pond 31 downstream of the second dam, and the return water pipe inlet 5 is located on the bottom plate of the water collection tank 4, and the outlet of the return pipe 7 is located on the side wall of the lower water collection tank 8 and communicated with each other; a water pump 11 is installed on the top of the lower water collection tank 8, and the upper water pipe inlet 10 of the upper water pipe 9 is connected to the water pump 11. The water outlet 12 of the upper water pipe communicates with the bottom of the upper water collection tank 14; the upper water collection tank 14 is spaced by a steady flow baffle 15 and a steady flow orifice 16, and the water outlet 17 of the upper water collection tank is connected to the side pier 19 and the crest of the overflow system. The water inlet formed by the curved section 21 is connected; the frame-shaped support 13 supports the upper water collection tank 14 and fixes the water pump 11 , and the top of the upper water collection tank 14 is provided with a top cover 18 .

Further, the overflow system includes a middle pier 20, the pier head and pier tail of the middle pier 20 are semicircular, the upstream and downstream ends of the side pier 19 on both sides are 1/4 circular, and the side pier 19 and The curved section 21 of the weir crest is connected with the water outlet 17 of the upper water collection tank, and the water flow is discharged from the top curved section 21 along the dam surface to form a surface flow; It is smoothly connected with the lower anti-arc section 23, and the lower anti-arc section 23 is also smoothly connected with the horizontal nose sill section 24. The water flow passes through the nose sill section 24 to form a water jet and falls into the downstream water cushion pond.

Further, the energy dissipation system includes the bottom plate 25 of the water cushion pond 30, the slopes 26 on both sides, the horizontal horseway 27, the second dam 28, the granular blocks in the water cushion pond and the downstream stilling pond 31; the water cushion The pond bottom plate 25 is a horizontal bottom plate, and both sides are provided with a slope 26 with a certain slope rate, and horizontal horseways 27 are respectively arranged; the upstream slope surface of the two dams 28 is perpendicular to the bottom plate 25, and the downstream slope surface is a slope surface with a certain slope rate; The granule block is thrown in the pad pond 30 at random.

Further, in the energy dissipation system, the second dam 28 and the slopes 26 on both sides of the downstream form a stilling pond 31 to perform secondary energy dissipation on the projecting water flow.

Further, the two sides of the pad pond 30 are provided with slopes 26 with a certain slope rate, and horizontal horseways 27 are respectively provided to form a compound trapezoidal cross section with a large top and a small bottom.

Further, the granular blocks placed in the pad pond 30 are samples of a certain shape and size made of a certain material, and samples of different materials, shapes and sizes can be used for different researches.

Further, the granular block can be in different shapes such as rectangular block, triangular pyramid block, or hexahedron.

Example 2:

In this embodiment, the size of the downstream water collection tank in the water circulation system is 0.3m×1.2m×0.8m, the diameter of the return pipe is 0.1m, the size of the lower water collection tank is 1.0m×1.25m×0.6m, and the diameter of the upper water pipe The diameter is 0.05m, and the size of the upper water collection tank is 1.0m×0.7m×1.0m. It is spaced by a steady flow baffle and a steady flow orifice. The frame-shaped bracket is made of angle steel with a side length of 0.05m to support the upper water tank and the water pump. . The overflow dam is divided into 3 holes, the net width of a single hole is 0.175m, the width of the middle pier is 0.05m, and the width of the side pier is 0.037m. The pond is 2.3m long, 0.6m wide at the bottom, 0.8m deep, and the slope ratio on both sides is 1:0.3; the granular blocks placed in the pond are prefabricated regular tetrahedron and cubic concrete blocks, which have three different Particle size; wherein, the side lengths of the cube concrete blocks are 3cm, 4cm, and 5cm respectively; the edge lengths of the regular tetrahedron concrete blocks are 6.12cm, 8.16cm, and 10.20cm, respectively. The pad pond material is made of transparent plexiglass, so as to observe the water flow phenomenon and the scouring situation in the device.

Through the above description, those skilled in the art can make various changes and modifications without departing from the technical idea of the utility model, all of which are within the protection scope of the utility model. Unfinished matters of the utility model belong to the common knowledge of those skilled in the art.

Claims (4)

1. a kind of flip trajectory bucket experimental rig for being applied to cushion pool, it is characterised in that：It includes water circulation system, overflow system And energy-dissipating system, for providing continuous, stable circulating water flow for experiment, satisfaction tests water supply requirement to the water circulation system； The overflow system is used to be provided for experiment the flip shot current of fluid stable；Cushion pool in the energy-dissipating system simulation Practical Project The landform of both sides, and the common energy dissipating of anti-impact system constituted using the water body and shot block stone accumulation body in cushion pool；

The water circulation system includes downstream water leg（4）, the downstream water leg（4）By return pipe（6）Enter with return pipe Mouthful（5）It is connected, the stilling pond in the Dao Ba downstreams of Bing Yu bis-（31）It is connected, the return pipe import（5）Positioned at water leg（4）'s On base plate, return pipe outlet（7）Positioned at lower condensate sump（8）Side wall on and be connected；Lower condensate sump（8）Top is provided with water Pump（11）, upper hose（9）Upper hose water inlet（10）With water pump（11）It is connected, upper hose delivery port（12）With upper condensate sump （14）Bottom connects；The upper condensate sump（14）Use current stabilization baffle plate（15）With current stabilization orifice plate（16）Interval, upper condensate sump delivery port （17）With the abutment pier of overflow system（19）And crest section（21）The water inlet of formation is communicated；Frame-type support（13）Collect in support Water tank（14）And fixed water pump（11）, upper condensate sump（14）Top is provided with top cover（18）.

2. a kind of flip trajectory bucket experimental rig for being applied to cushion pool according to claim 1, it is characterised in that：It is described to overflow Streaming system includes middle pier（20）, the middle pier（20）Pier nose and pier tail using semicircle, both sides abutment pier（19）Upstream and downstream end It is circular using 1/4, abutment pier（19）With weir crest curved section（21）With upper condensate sump delivery port（17）It is connected, current are bent from top Line segment（21）Surface current is formed along being let out under dam facing；The downflow weir top curve pattern uses WES curves, middle straight line section（22）With Top curve section（21）With bottom ogee section（23）Smooth connection, bottom ogee section（23）With horizontal bucket lip section（24）It is also adopted by putting down Slip, current are by bucket lip section（24）Flip shot current are formed, in dropping to the water cushion pool downstream pool.

3. a kind of flip trajectory bucket experimental rig for being applied to cushion pool according to claim 1, it is characterised in that：It is described to disappear Energy system includes cushion pool（30）Base plate（25）, sloped sides（26）, horizontal packway（27）, Er Daoba（28）, in cushion pool Shot block and downstream stilling pond（31）；The plunge pool floor（25）It is horizonal base plate, both sides set the oblique of certain ratio of slope Slope（26）, and it is respectively provided with horizontal packway（27）；Two road dam（28）Upstream is domatic perpendicular to base plate（25）, downstream is domatic to be The slope of certain ratio of slope；The shot block is delivered in cushion pool at random（30）In.

4. a kind of flip trajectory bucket experimental rig for being applied to cushion pool according to claims 1, it is characterised in that：It is described Two road dam in energy-dissipating system（28）With downstream sloped sides（26）Form stilling pond（31）, secondary energy dissipating is carried out to flip shot current.