CN218030205U

CN218030205U - Bidirectional water passing tunnel outlet structure

Info

Publication number: CN218030205U
Application number: CN202222604796.4U
Authority: CN
Inventors: 郑湘文; 毛拥政; 党力; 赵玮; 补舒棋; 杨蕾
Original assignee: Shaanxi Institute Of Water Conservancy And Electricity Survey And Design
Current assignee: Shaanxi Institute Of Water Conservancy And Electricity Survey And Design
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2022-12-13
Anticipated expiration: 2032-09-30

Abstract

The utility model discloses a bidirectional water passing tunnel outlet structure, which comprises a connecting hole for receiving tail water of a power station, an overflow weir, a retaining wall, a drain pipe, a vertical shaft and a transition pool communicated with the connecting hole; the overflow weir is arranged between the connecting hole and the transition tank; the retaining wall is arranged at the water outlet of the transition pool; the drain pipe penetrates through the retaining wall, and the water outlet of the drain pipe is communicated with the drainage ditch; the vertical shaft is arranged below the connecting hole, vertically extends downwards from the bottom surface of the connecting hole, is communicated with the connecting hole and is used for conveying tail water to the connecting hole or conveying water in the opposite direction from the connecting hole to a water suction pipe of the bidirectional unit through the vertical shaft. The utility model discloses a set up overflow weir and with the transition pond of being connected the hole intercommunication for when the tail water was shoved and highly is higher than the highest water level of surging of design, the accessible overflow weir of the water of surging to the transition pond finally transmitted to the factory drainage ditch, avoid the tail water to spill over the incident that leads to, its simple structure, the construction degree of difficulty are low, the cycle is short and with low costs.

Description

Bidirectional water-passing tunnel outlet structure

Technical Field

The utility model discloses a two-way water tunnel exit structure that crosses belongs to hydraulic and hydroelectric engineering technical field.

Background

In order to meet the engineering requirements of power generation, water supply and water pumping, a tail water system of a power station is also used as a front pool of a bidirectional unit, so that a bidirectional water passing tunnel needs to be arranged. In the water-passing tunnel in the prior art, an inlet and an outlet of the tunnel are used as inlet and outlet channels in the construction period under the condition of no water passing, and the outlet of the water-passing tunnel needs to be plugged after construction is finished. According to the hydraulic transition calculation of the flow channel, under the most unfavorable working condition of large fluctuation, the technical problems that the surge height of tail water is higher than the designed highest surge water level, the water surge of a tail water gate occurs, and the safety is reduced exist.

In order to solve the technical problems in the prior art, the adopted scheme is to lift the tail water gate platform generally. But raise tail sluice platform, just correspondingly need carry out the adaptability adjustment to multiple building, unfavorable to power plant main building, lead to main building rationality to reduce, the construction degree of difficulty increases, construction cycle extension and construction cost promote.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a two-way water tunnel exit structure of crossing to solve among the prior art and gush water to adopt the main part building rationality reduction of raising tail sluice platform existence for solving the tail sluice, the construction degree of difficulty is high, construction cycle is long and construction cost is high technical problem.

The utility model provides a bidirectional water passing tunnel outlet structure, which comprises a connecting hole for receiving tail water of a power station, an overflow weir, a retaining wall, a drain pipe, a vertical shaft and a transition pool communicated with the connecting hole;

the overflow weir is arranged between the connecting hole and the transition tank;

the bottom surface of the transition pool is lower than the height of the overflow weir;

the retaining wall is arranged at the water outlet of the transition pool, and the length of the retaining wall is equal to the width of the water outlet of the transition pool;

the drain pipe penetrates through the retaining wall, and a water outlet of the drain pipe is communicated with the drainage ditch;

the vertical shaft is arranged below the connecting hole, vertically extends downwards from the bottom surface of the connecting hole, is communicated with the connecting hole, and is used for conveying the tail water to the connecting hole or conveying the water in the opposite direction from the connecting hole to a water suction pipe of the bidirectional unit through the vertical shaft.

Preferably, the bottom surface of the transition pool is a slope surface, and the water inlet of the transition pool inclines downwards towards the water outlet of the transition pool.

Preferably, the gradient of the bottom surface of the transition pool is 0.5% -1%.

Preferably, the drain pipe is arranged at the bottom of the retaining wall.

Preferably, the volume of the transition pool is 1.3-1.5 times of the water inflow amount;

the water inflow is the tail water amount which is poured out from the overflow weir.

Preferably, the height of the overflow weir is less than the preset highest surge water level of the connecting hole.

The utility model discloses a two-way water tunnel exit structure that crosses compares in prior art, has following beneficial effect:

the utility model discloses a two-way water tunnel exit structure of crossing is through setting up overflow weir and with the transition pond of being connected the hole intercommunication for when the tail water was shoved and highly is higher than the highest water level of surging of design, the tail water was shoved and can be transmitted to the factory drainage ditch through overflow weir to transition pond, avoids the tail water to spill over the incident that leads to, its simple structure, the construction degree of difficulty is low, the cycle is short and with low costs.

Drawings

Fig. 1 is a schematic plan view of a bidirectional water tunnel exit structure in an embodiment of the present invention;

fig. 2 is a schematic longitudinal section of a bidirectional water tunnel outlet structure in an embodiment of the present invention;

fig. 3 is a schematic diagram of the surge water amount above 548.5 elevation in the embodiment of the present invention.

In the figure, 1 is a connecting hole; 2 is an overflow weir; 3 is a retaining wall; 4 is a vertical shaft; 5 is a drain pipe; 6 is a drainage ditch; and 7, a transition pool.

Detailed Description

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

As shown in fig. 1, the two-way water tunnel outlet structure of the embodiment of the present invention comprises a connection hole 1 for receiving tail water of a power station, an overflow weir 2, a retaining wall 3, a vertical shaft 4, a drain pipe 5 and a transition pool 7 communicated with the connection hole 1;

wherein the overflow weir 2 is arranged between the connecting hole 1 and the transition pool 7;

the bottom surface of the transition tank 7 is lower than the height of the overflow weir 2;

the retaining wall 3 is arranged at the water outlet of the transition tank 7, and the length of the retaining wall 3 is equal to the width of the water outlet of the transition tank 7;

the drain pipe 5 penetrates through the retaining wall 3, and the water outlet of the drain pipe 5 is communicated with the drainage ditch 6;

the vertical shaft 4 is arranged below the connecting hole 1, vertically extends downwards from the bottom surface of the connecting hole 1, is communicated with the connecting hole 1, and is used for conveying tail water to the connecting hole 1 or conveying water in the opposite direction from the connecting hole 1 to a water suction pipe of the bidirectional unit through the vertical shaft 4.

The utility model discloses a two-way water tunnel exit structure of crossing is through setting up overflow weir 2 and with transition pond 7 of being connected 1 intercommunication in hole for when the tail water was surfed and is highly higher than the highest water level of surging of design, the tail water can be transmitted to factory drainage ditch 6, has absorbed the most unfavorable operating mode in the water conservancy transition calculation: the maximum surge water level of the tail water system is higher than the design elevation of the tail water gate under large fluctuation, so that safety accidents caused by overflow of tail water are avoided, and the tail water system is simple in structure, low in construction difficulty, short in period and low in cost.

In a specific embodiment, the bottom surface of the transition tank 7 can be higher than the bottom surface of the connecting hole 1 and lower than the height of the overflow weir 2, so that the tail water overflowing from the overflow weir 2 does not have a high fall when entering the transition tank 7, and the service life of the transition tank 7 is prolonged.

The embodiment of the utility model provides an in, overflow weir 2 highly is less than the highest water level of surging of predetermined connection hole to can be so that under the big undulant condition, the tail water that is higher than the highest water level of surging of design can follow overflow weir 2 and flow.

Can all discharge to the existing escape canal 6 in factory for the tail water of guaranteeing transition pond 7, avoid the tail water to store up and lead to overflowing, the embodiment of the utility model provides a set up the bottom surface of transition pond 7 to domatic, domatic is by the water inlet of transition pond 7 to the delivery port direction downward sloping of transition pond 7.

Further, for the velocity of flow of tail water in the reduction transition pond 7, avoid the velocity of flow to overflow escape canal 6 at the excessive speed, the utility model discloses a bottom surface slope of transition pond 7 is 0.5% -1%.

In the embodiment, the volume of the transition pool 7 is 1.3-1.5 times of the water inflow amount through the retaining wall 3; the tail water volume of gushing the water yield for gushing out via the overflow weir avoids too much tail water to spill over transition pond 7, and can slow down the velocity of flow of tail water in transition pond 7, utilizes one or more drain pipes 5 to discharge tail water reposition of redundant personnel to escape canal 6 simultaneously to can effectively avoid the too fast tail water of velocity of flow to spill over escape canal 6.

Further, the drain pipe 5 of the present embodiment is provided at the bottom of the retaining wall 3, thereby achieving the complete drainage of the tail water in the transition tank 7.

The utility model provides a two-way water tunnel exit structure that crosses, when the electricity generation, the tail water gets into to connect the hole 1 via shaft 4, when drawing water, loops through connect the hole 1 and shaft 4 gets into the leading water pipe and draws water.

Among the prior art, when the maintenance to the tailrace water system, be the construction branch tunnel through the control gate and get into, perhaps get into through the exit of the sluice that moves back, and the utility model discloses owing to set up transition pond 7, consequently can get into through transition pond 7, it is more convenient to the maintenance of tailrace water system.

In one specific embodiment, the connecting hole is a level 1 building, and the service life is 100 years. The tail water circulating system is a part of the whole tail water flow passage system, has bidirectional overflow, meets the engineering tasks of power generation, water supply and water pumping, and is also a key node of water supply of the overall engineering. And an overflow weir is arranged at the outlet of the connecting hole, and the overflow weir can overflow the highest surge water head to release pressure. Furthermore, in order to make the overflow water have reasonable space for consumption, the embodiment adds a transition tank to satisfy upstream normal water storage level 643.0m, the highest tail water level at the downstream is 548.1m, and (4) the highest surge water amount which is used for throwing the full load T3 working condition when the four machines run with full output is consumed. In this embodiment, the height of the overflow weir at the outlet of the tail water tank is defined as 548.5, the water quantities above 548.5 are all required to be accommodated by the transition tank, and the part of the water quantities are required to be organically drained to the plant area and connected with a plant area drainage system. The amount of surge water above 548.5 elevation is shown in figure 3.

According to the body type design drawing of the connecting hole and the tail water pool and the actual measurement of the outlet of the tail water pool and the outlet hole face topography, two retaining walls with the widths of 9.84m and 6m are designed at the outlet respectively. The first retaining wall is an overflow weir, the elevation of the weir crest is 548.5m, and when surge exceeds 548.5m, water in the connecting hole overflows. The second retaining wall is designed at the water outlet of the transition pool, and the height of the top of the retaining wall is 548.5m. The volume of the middle transition pool must absorb the water amount of the surge above 548.5m. And a drain pipe is embedded at the bottom of the second outlet retaining wall, and water is drained to the drainage ditch of the plant area in an organized manner. According to calculation, the total amount of the surge water in the three sections is 101.8m ³ And the volume between two retaining walls of the tail water pool outlet of the connecting hole is 157.02m ³ And the engineering requirements are met.

The utility model discloses a two-way water tunnel exit structure has been built and has been approved and pass through, and the power station has started the electricity generation, and operating condition is good.

Although the present invention has been described with reference to a few preferred embodiments, it should be understood that various changes and modifications can be made without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A bidirectional water passing tunnel outlet structure is characterized by comprising a connecting hole for receiving tail water of a power station, an overflow weir, a retaining wall, a drain pipe, a vertical shaft and a transition pool communicated with the connecting hole;

the vertical shaft is arranged below the connecting hole, vertically and downwardly extends from the bottom surface of the connecting hole, is communicated with the connecting hole, and is used for conveying the tail water to the connecting hole or conveying the water from the connecting hole to a water suction pipe of the bidirectional unit through the vertical shaft in the opposite direction.

2. The two-way water tunnel exit structure of claim 1, wherein the bottom surface of the transition tank is a sloping surface and slopes downward from the water inlet of the transition tank to the water outlet of the transition tank.

3. The bidirectional water tunnel exit structure of claim 2, wherein the transition pool has a floor slope of 0.5% -1%.

4. The bidirectional water tunnel exit structure of claim 1, wherein the drain pipe is disposed at the bottom of the retaining wall.

5. The bidirectional water tunnel exit structure of claim 1, wherein the volume of the transition pool is 1.3 to 1.5 times the volume of the water inflow;

the water inflow amount is tail water amount which is poured out from the overflow weir.

6. The bidirectional water tunnel exit structure of claim 1, wherein the height of the overflow weir is less than a preset maximum surge level of the connecting hole.