Transition structure of large-section drainage tunnel and rectangular section

Abstract

The application relates to a transition structure for connecting a large-section flood drainage tunnel and a rectangular section. The application is suitable for the technical field of water intake and water delivery engineering. The technical problem to be solved by the application is to provide a transition structure for connecting a large-section flood drainage tunnel and a rectangular section. The technical solution adopted by the application is as follows: a transition structure for connecting a large-section flood drainage tunnel and a rectangular section, comprising: a gradual change section, one end of which is connected with the tunnel, and the other end is connected with a rectangular box culvert, and the inner flow section is smoothly changed from the tunnel flow section to the rectangular flow section; a middle partition wall, which is provided in the gradual change section and divides the gradual change section into multiple flow sub-passages; the sectional area of the middle partition wall increases with the increase of the flow section area of the gradual change section, so that the flow area difference of the flow section of the gradual change section after the middle partition wall is arranged is within a preset range in the water flow direction, and the flow area difference of each flow sub-passage is within a preset range in the water flow direction.

Description

Technical Field

[0001] This utility model relates to a transition structure connecting a large-section drainage tunnel to a rectangular section. It is applicable to water intake and water conveyance projects. Background Technology

[0002] In water conservancy projects, the cross-sectional shape of large-section drainage tunnels is determined based on factors such as engineering geology, construction methods, hydraulics, ground stress conditions, and economic efficiency. Tunnels in rock masses often have archway-shaped, horseshoe-shaped, or circular cross-sections, while shallowly buried sections in soil layers are mostly rectangular box culverts. Connections between different cross-sections must meet hydraulic and structural safety requirements. The conventional method for connecting different cross-sections is through vertical shafts, which rigidly connect two cross-sections at different elevations. This method suffers from problems such as poor water flow, large local head loss, and structural complexity, affecting the overall efficiency and safety of the project. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a transition structure connecting a large-section drainage tunnel and a rectangular section, in order to address the above-mentioned problems.

[0004] The technical solution adopted in this utility model is: a transition structure connecting a large-section drainage tunnel and a rectangular section, characterized in that it includes:

[0005] The transition section connects to the tunnel at one end and to the rectangular box culvert at the other end. The flow section inside it smoothly transitions from the flow section of the tunnel to the flow section of the rectangle.

[0006] At least one intermediate partition wall is provided within the gradient section to divide the gradient section into multiple flow sub-channels;

[0007] The cross-sectional area of ​​the central partition wall increases with the increase of the cross-sectional area of ​​the transition section, so that the difference in the cross-sectional area of ​​the transition section after the central partition wall is installed is within a preset range in the direction of water flow, and the difference in the cross-sectional area of ​​each sub-channel is within a preset range in the direction of water flow.

[0008] The central partition wall is arranged symmetrically about the axis of the gradient section.

[0009] The rectangular box culvert is equipped with a partition wall corresponding to the central partition wall.

[0010] The water-stopping structure includes polysulfide sealant, polyethylene closed-cell foam board, SR water-stopping sealant and polyethylene closed-cell foam board arranged sequentially from the water-facing side to the back side of the structural joint, wherein a water-stopping copper sheet is provided at the SR water-stopping sealant.

[0011] The beneficial effects of this utility model are: This utility model connects the tunnel and the rectangular box culvert through a transition section. The flow section in the transition section smoothly transitions from the tunnel flow section to the rectangular flow section, thereby achieving a smooth transition between different cross-sectional shapes, reducing water flow resistance and head loss, and improving engineering efficiency.

[0012] This invention sets up a partition wall in the transition section to ensure that the difference in flow area of ​​the transition section cross section in the direction of water flow is within a preset range, and that the difference in flow area of ​​each flow sub-channel in the direction of water flow is within a preset range, thus ensuring the symmetry and stability of the water flow and avoiding the impact of sudden changes in flow velocity on the structure.

[0013] This invention employs a water-stopping structure, such as copper sheet water-stopping, at structural joints, which improves the waterproof performance of the structure and ensures the safety of the project.

[0014] The gradually changing wall surface in this invention adopts continuous curvature changes in both the horizontal and vertical directions, which more effectively avoids streamline separation and reduces the generation of local eddies.

[0015] The increased area of ​​the central partition wall in this invention follows the principle of constant flow velocity constraint. By controlling the rate of change of the flow area of ​​adjacent sections, excessive flow velocity fluctuations are reduced. The base of the central partition wall adopts a trapezoidal thickening design to enhance the resistance to water flow impact while preventing stress concentration cracking at the wall base and top arch, thereby improving structural strength and durability.

[0016] In this invention, the ends of the partition wall and the middle partition wall are connected by a smooth arc, which eliminates the turbulence caused by traditional right-angle connections and reduces head loss at the connection.

[0017] This utility model features a triple settlement adaptive water-stopping system. In the water-stopping structure: polysulfide sealant provides initial elastic sealing; double-sided closed-cell foam board absorbs uneven settlement deformation; and W-shaped water-stopping copper sheet forms a permanent rigid water barrier under the wrapping of SR material. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of an embodiment.

[0019] Figure 2 This is a schematic diagram of the floor plan layout for an embodiment.

[0020] Figure 3 for Figure 2 AA sectional view.

[0021] Figure 4 for Figure 2 BB cross-sectional view.

[0022] Figure 5 for Figure 2 CC section view.

[0023] Figure 6 for Figure 2 DD sectional view.

[0024] Figure 7 This is a schematic diagram of the water-stopping structure in the embodiment.

[0025] 1. Gradient section; 2. Tunnel; 3. Rectangular box culvert; 4. Central partition wall; 5. Structural joint; 6. Partition wall; 7. Water-stopping structure; 7-1. Polysulfide sealant; 7-2. Polyethylene closed-cell foam board; 7-3. SR water-stopping sealant; 7-4. Water-stopping copper sheet. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] like Figures 1-6 As shown, this embodiment is a transition structure connecting a large-section drainage tunnel and a rectangular section. The transition structure uses a transition section to connect the tunnel and the rectangular box culvert. One end of the transition section connects to the tunnel, and the other end connects to the rectangular box culvert. The flow section in the transition section smoothly transitions from the flow section of the tunnel (which is consistent with the flow section of the tunnel) to the rectangular flow section (which is consistent with the flow section of the rectangular box culvert).

[0029] In this example, two intermediate partition walls are installed within the transition section. These two partition walls are symmetrically arranged about the axis of the transition section, and they divide the transition section into three flow channels. The base of the partition walls adopts a trapezoidal thickening design.

[0030] In this embodiment, the cross-sectional area of ​​the partition wall at each part in the water flow direction changes with the change of the cross-sectional area of ​​the transition section at the same part, so that the difference in the cross-sectional area of ​​the transition section after the partition wall is installed is within a preset range, and the difference in the cross-sectional area of ​​each sub-channel is within a preset range. Thus, by controlling the change of the cross-sectional area, the flow velocity of the water in the transition section does not change significantly, while meeting the structural strength requirements.

[0031] In this example, the rectangular box culvert has two partition walls inside. The partition walls correspond one-to-one with the middle partition walls in the transition section, and the shape and size of the partition wall cross-section are consistent with the end cross-section of the middle partition wall.

[0032] In this embodiment, water-stopping structures are provided in the structural joints between the transition section and the tunnel, and in the structural joints between the transition section and the rectangular box culvert. The water-stopping structures include, sequentially arranged from the water-facing side to the back side of the structural joint, polysulfide sealant, polyethylene closed-cell foam board, SR water-stopping sealant, and polyethylene closed-cell foam board, wherein a water-stopping copper sheet is provided at the SR water-stopping sealant location (see...). Figure 7 ).

[0033] 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 transition structure connecting a large-section drainage tunnel to a rectangular section, characterized in that, include: The transition section connects to the tunnel at one end and to the rectangular box culvert at the other end. The flow section inside it smoothly transitions from the flow section of the tunnel to the flow section of the rectangle. At least one intermediate partition wall is provided within the gradient section to divide the gradient section into multiple flow sub-channels; The cross-sectional area of ​​the central partition wall increases with the increase of the cross-sectional area of ​​the transition section, so that the difference in the cross-sectional area of ​​the transition section after the central partition wall is installed is within a preset range in the direction of water flow, and the difference in the cross-sectional area of ​​each sub-channel is within a preset range in the direction of water flow.

2. The transition structure connecting the large-section drainage tunnel and the rectangular section according to claim 1, characterized in that: The central partition wall is arranged symmetrically about the axis of the gradient section.

3. The transition structure connecting the large-section drainage tunnel and the rectangular section as described in claim 1, characterized in that: The rectangular box culvert is equipped with a partition wall corresponding to the central partition wall.

4. The transition structure connecting the large-section drainage tunnel and the rectangular section as described in claim 1, characterized in that: Water-stopping structures are provided in the structural joints between the transition section and the tunnel, as well as in the structural joints between the transition section and the rectangular box culvert.

5. The transition structure connecting the large-section drainage tunnel and the rectangular section according to claim 4, characterized in that: The water-stopping structure includes polysulfide sealant, polyethylene closed-cell foam board, SR water-stopping sealant and polyethylene closed-cell foam board arranged sequentially from the water-facing side to the back side of the structural joint, wherein a water-stopping copper sheet is provided at the SR water-stopping sealant.

6. The transition structure connecting the large-section drainage tunnel and the rectangular section according to claim 1, characterized in that: The base of the central partition wall features a trapezoidal thickening design.

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