Anti-clogging diversion discharge hole inlet structure

Abstract

The anti-clogging diversion discharge hole inlet structure comprises an inlet concrete structure and a plugging gate, the inlet concrete structure is provided with a first channel and a second channel, the first channel is provided with a horizontal inlet and a connecting hole which are oppositely arranged, and the connecting hole is connected with a hole of a diversion hole; the second channel extends in the vertical direction and communicates with the first channel, the second channel is provided with a vertical shaft inlet, and the vertical shaft inlet is located at the top of the inlet concrete structure; the blocking gate is located on the side, close to the horizontal inlet, of the first channel and can seal the horizontal inlet. The anti-clogging diversion discharge hole inlet structure can solve the problems that in a diversion hole reconstruction project, the elevation of an inlet is low, and clogging exists in the operation period.

Description

A silt-proof drainage tunnel inlet structure Technical Field

[0001] This application relates to the technical field of diversion tunnel reconstruction engineering, specifically to an inlet structure for a diversion and discharge tunnel that prevents siltation. Background Technology

[0002] The entrance of a diversion tunnel is usually set relatively low. In the project of converting a diversion tunnel into a permanent venting tunnel or flood discharge tunnel, there is usually a need to raise the elevation of the inlet, such as by adopting the "dragon head" scheme. Summary of the Invention

[0003] This application provides an anti-clogging diversion and discharge tunnel inlet structure, which can overcome the problem of low inlet elevation and clogging during operation in diversion tunnel reconstruction projects.

[0004] The anti-clogging diversion and discharge tunnel inlet structure provided in this application includes: an inlet concrete structure, the inlet concrete structure having a first channel and a second channel, the first channel having a horizontal inlet and a connecting opening arranged opposite to each other, the connecting opening being connected to the opening of the diversion tunnel, the second channel extending vertically and communicating with the first channel, the second channel having a vertical shaft inlet, the vertical shaft inlet being located at the top of the inlet concrete structure;

[0005] A blocking gate is located on the side of the first channel near the horizontal inlet, and the blocking gate is capable of closing the horizontal inlet.

[0006] In addition, the anti-clogging drainage tunnel inlet structure provided in this application may also have the following additional technical features:

[0007] In one alternative, the orifice elevation of the shaft inlet is higher than the siltation elevation of the inlet slope and lower than the dead water level; the flow space at the shaft inlet is larger than the cross-section of the diversion tunnel to reduce the flow velocity and minimize local head loss at the inlet.

[0008] In one alternative embodiment, the imported concrete structure is fixed by multiple anchor bars driven downwards, with the anchor bars spaced apart within the foundation area of ​​the concrete structure, and the cavity between the concrete structure and the imported slope is filled with backfill concrete.

[0009] In one alternative embodiment, a water-stopping structure is provided at the connection between the connecting opening and the diversion hole, the water-stopping structure comprising multiple copper waterstops disposed on the inner wall of the connection between the first channel and the diversion hole.

[0010] In one alternative, the sealing gate is a concrete stacked beam gate, and the lowest stacked beam gate of the concrete stacked beam gate has multiple pressure equalization holes. The pressure equalization holes are used to reduce the buoyancy caused by the internal and external pressure difference during the period before the water level reaches the inlet of the vertical shaft.

[0011] The beneficial effects of this application are as follows:

[0012] The anti-siltation diversion and discharge tunnel inlet structure in this application improves the inlet concrete structure. During diversion, a low-level horizontal inlet can be used for discharge. After the diversion function ends, the sealing gate is closed and sealed. During permanent operation, water can be introduced through the vertical shaft inlet, thereby solving the siltation problem of the diversion and discharge tunnel inlet during permanent operation. The vertical shaft inlet, which protrudes upwards, can also reduce the risk of the inlet excavation slope collapsing and blocking the tunnel opening. Its structure is simple, easy to construct, and can effectively save investment.

[0013] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0014] Figure 1 is a cross-sectional schematic diagram of the imported concrete structure provided in this application in a specific embodiment;

[0015] Figure 2 is a schematic diagram of the plan layout of the imported concrete structure in Figure 1;

[0016] Figure 3 is an upstream elevation view of the inlet concrete structure in Figure 1;

[0017] Figure 4 is a cross-sectional schematic diagram of the imported concrete structure at the entrance of the shaft in Figure 1.

[0018] Attached reference numerals: 1. Inlet concrete structure, 11. First channel, 12. Second channel, 13. Horizontal inlet, 14. Connecting opening, 15. Vertical shaft inlet, 2. Diversion tunnel, 3. Sealing gate, 4. Anchor bar, 5. Backfill concrete, 6. Water-stopping structure, 7. Inlet slope, 8. Natural slope.

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0020] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0021] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0022] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0023] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0024] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0025] As shown in Figures 1-4, this application embodiment provides an anti-clogging diversion and discharge tunnel inlet structure. This anti-clogging diversion and discharge tunnel inlet structure mainly includes an inlet concrete structure 1 and a sealing gate 3. The inlet concrete structure 1 has a first channel 11 and a second channel 12. The first channel 11 has a horizontal inlet 13 and a connecting opening 14 arranged opposite to each other. The connecting opening 14 connects to the opening of the diversion tunnel 2. The second channel 12 extends vertically and connects to the first channel 11. The second channel 12 has a vertical shaft inlet 15, located at the top of the inlet concrete structure 1. The sealing gate 3 is located on the side of the first channel 11 near the horizontal inlet 13, and can close the horizontal inlet 13. When the reservoir is impounding water, the emergency gate set in the diversion tunnel 2 is used for impounding. The main function of the sealing gate 3 set in the inlet section is to prevent siltation from entering the inlet of the diversion tunnel 2 during normal operation, thus affecting the safety of water discharge.

[0026] In this embodiment, the inlet concrete structure 1 is divided into three parts according to its function: the upstream horizontal inlet 13, the middle vertical shaft inlet 15, and the downstream connecting opening 14. The upstream horizontal inlet 13 serves as the inlet of the diversion tunnel 2, and a sealing gate 3 is installed in this part of the structure. The middle vertical shaft inlet 15 serves as the inlet of the discharge tunnel. The downstream connecting opening 14 is used to connect the inlet concrete structure 1 and the diversion tunnel 2. During the diversion period, the low-level horizontal inlet 13 can be used for discharge. After the diversion function ends, the sealing gate 3 is closed to seal. During permanent operation, water is introduced through the vertical shaft inlet 15, thereby changing the problem of siltation at the inlet of the diversion and discharge tunnel during permanent operation. The vertical shaft inlet 15, which protrudes upwards in the shape of a shaft, can also reduce the risk of the inlet excavation slope collapsing and blocking the opening. Its structural form is simple, easy to construct, and can effectively save investment.

[0027] As shown in Figures 1-4, in one specific embodiment, the orifice elevation of the shaft inlet 15 is higher than the siltation elevation of the inlet slope 7 (the inlet slope 7 is formed by excavation of the natural slope 8) and lower than the dead water level; the flow space of the shaft inlet 15 is larger than the cross-section of the diversion tunnel 2 to reduce the flow velocity and minimize local head loss at the inlet section. Furthermore, the inlet concrete structure 1 is fixed by multiple downwardly driven anchor bars 4, which are spaced apart within the foundation of the concrete structure. The cavity between the concrete structure and the inlet slope 7 is filled with backfill concrete 5.

[0028] As shown in Figures 1-4, in one specific embodiment, a water-stopping structure 6 is provided at the connection between the connecting opening 14 and the diversion tunnel 2. The water-stopping structure 6 includes multiple copper waterstops installed on the inner wall of the connection between the first channel 11 and the diversion tunnel 2. The sealing gate 3 is a concrete stacked beam gate. Multiple pressure-leveling holes are opened on the lowest stacked beam gate. The pressure-leveling holes are used to reduce the buoyancy problem caused by the pressure difference between the inside and outside by increasing the water level in the inlet cavity as the water level rises during the period before the water level reaches the vertical shaft inlet 15.

[0029] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A silt-preventing drainage tunnel inlet structure, characterized in that, include: An imported concrete structure has a first channel and a second channel. The first channel has a horizontal inlet and a connecting opening arranged opposite to each other. The connecting opening is connected to the opening of a diversion tunnel. The second channel extends vertically and communicates with the first channel. The second channel has a vertical shaft inlet located at the top of the imported concrete structure. A sealing gate is located on the side of the first channel near the horizontal inlet and is capable of closing the horizontal inlet.

2. The anti-clogging diversion and discharge tunnel inlet structure according to claim 1, characterized in that, The elevation of the shaft inlet orifice is higher than the siltation elevation of the inlet slope and lower than the dead water level; the flow space at the shaft inlet is larger than the cross-section of the diversion tunnel to reduce the flow velocity and minimize local head loss at the inlet section.

3. The anti-clogging diversion and drainage tunnel inlet structure according to claim 2, characterized in that, The imported concrete structure is fixed by multiple anchor bars driven downwards. The multiple anchor bars are spaced apart within the foundation range of the concrete structure, and the cavity between the concrete structure and the imported slope is filled with backfill concrete.

4. The anti-clogging diversion and drainage tunnel inlet structure according to any one of claims 1-3, characterized in that, A water-stopping structure is provided at the connection between the connecting opening and the diversion hole. The water-stopping structure includes multiple copper waterstops installed on the inner wall of the connection between the first channel and the diversion hole.

5. The anti-clogging diversion and discharge tunnel inlet structure according to any one of claims 1-3, characterized in that, The sealing gate is a concrete stacked beam gate. The lowest stacked beam gate of the concrete stacked beam gate has multiple pressure equalization holes. The pressure equalization holes are used to reduce the buoyancy caused by the internal and external pressure difference during the period before the water level reaches the inlet of the vertical shaft.

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