Inlet structure for drainage tunnel with two parallel axes

Abstract

The utility model provides an inlet structure for a drainage tunnel with two parallel axes. The inlet structure comprises a first left wall, a first water diversion open channel bottom plate, a first right wall, a second left wall, a second water diversion open channel bottom plate and a second right wall. The first left side wall, the first water diversion open channel bottom plate and the first right side wall form a first overflowing channel; the axis of the first overflowing channel is collinear with the axis of the first flood discharge and sand discharge hole; the second left side wall, the second water diversion open channel bottom plate and the second right side wall form a second overflowing channel; and the axis of the second overflowing channel is collinear with the axis of the second flood discharge and sand discharge hole. The utility model provides an inlet structure for a drainage tunnel with two parallel axes, which can effectively control the flow state of inlet water flow, reduce local head loss and save engineering investment, thereby solving the problem of drainage of the inlet of the drainage tunnel with the two parallel axes.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to an inlet structure of a drainage tunnel for two parallel axis arrangements. Background Art

[0002] In order to meet the requirements of flood discharge or flood discharge and sand discharge, water conservancy and hydropower projects need to arrange discharge structures, such as flood discharge tunnels, flood discharge and sand discharge tunnels, flood discharge and emptying tunnels, spillways, etc. In combination with the flood discharge scale requirements, multiple discharge structures are sometimes required. According to the geological and topographical conditions of the project area, when multiple discharge structures are concentratedly arranged (with the axes at a certain angle or arranged in parallel), there are often problems such as turbulent water flow and large local head loss at the inlet, which affects the flood discharge capacity of the discharge structure, and then threatens the safety of the discharge tunnel and its upstream, causing great safety hazards to the operation of the power station. Utility Model Content

[0003] In view of the defects existing in the prior art, the utility model provides a drainage tunnel inlet structure for two parallel axis arrangements, which can effectively solve the above problems.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The utility model provides a drainage tunnel inlet structure for two parallel axis arrangements, comprising a first left wall (3), a first water diversion open channel bottom plate (4), a first right wall (5), a second left wall (6), a second water diversion open channel bottom plate (7) and a second right wall (8);

[0006] The first flood discharge and sand discharge hole (1) and the second flood discharge and sand discharge hole (2) are arranged with their axes parallel to each other, and the first flood discharge and sand discharge hole (1) is located on the left side of the second flood discharge and sand discharge hole (2); the first right wall (5) and the second left wall (6) are symmetrically arranged at the center of the entrances of the first flood discharge and sand discharge hole (1) and the second flood discharge and sand discharge hole (2);

[0007] The first left wall (3) is arranged on the left side of the first right wall (5), and the first water diversion open channel bottom plate (4) is arranged at the bottom of the first right wall (5) and the first left wall (3); the first left wall (3), the first water diversion open channel bottom plate (4) and the first right wall (5) form a first flow passage; the axis of the first flow passage is collinear with the axis of the first flood discharge and sand discharge tunnel (1);

[0008] The second right wall (8) is arranged on the right side of the second left wall (6), and the second water diversion open channel bottom plate (7) is arranged at the bottom of the second left wall (6) and the second right wall (8); the second left wall (6), the second water diversion open channel bottom plate (7) and the second right wall (8) form a second flow passage; the axis of the second flow passage is colinear with the axis of the second flood discharge and sand discharge tunnel (2).

[0009] Preferably, the inlet front edges of the first right wall (5) and the second left wall (6) are in contact and aligned to form a water flow dividing line.

[0010] Preferably, the flow surfaces of the first right wall (5) and the second left wall (6) are arc-shaped curved surfaces.

[0011] Preferably, the first left wall (3) is a lining structure of the slope excavation surface, and adopts a twisted surface arrangement, so that the first flow passage is unidirectionally contracted along the water flow direction.

[0012] Preferably, the flow surface of the second right wall (8) is an arc-shaped curved surface, and the arc radius of the second right wall (8) is the same as the arc radius of the second left wall (6), so that the second flow channel is symmetrically bidirectionally contracted along the water flow direction.

[0013] Preferably, the second right wall (8) has an arc-shaped base.

[0014] Preferably, the inlet front edges of the first left wall (3), the first water diversion open channel bottom plate (4), the first right wall (5), the second left wall (6), the second water diversion open channel bottom plate (7) and the second right wall (8) are flush.

[0015] Preferably, the first water diversion open channel bottom plate (4) and the second water diversion open channel bottom plate (7) are arranged horizontally.

[0016] The utility model provides a drainage tunnel inlet structure for two parallel axis arrangements, which has the following advantages:

[0017] The utility model provides an inlet structure for a drainage tunnel with two parallel axes, which can effectively control the flow state of the inlet water flow, reduce local head loss, and save engineering investment, thereby solving the problem of drainage in the inlet of the drainage tunnel with two parallel axes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic plan view of a drainage tunnel inlet structure for two parallel axis arrangements provided by the utility model;

[0019] Figure 2 for Figure 1A-A section in the middle;

[0020] Figure 3 for Figure 1 Middle B-B section;

[0021] Figure 4 for Figure 1 Middle C-C section;

[0022] Figure 5 for Figure 1 Middle D-D section;

[0023] Figure 6 A three-dimensional stereogram of a drainage tunnel inlet structure for two parallel axis arrangements provided by the utility model;

[0024] Figure 7 A three-dimensional diagram of the guide wall in the inlet section provided by the utility model;

[0025] in:

[0026] 1——the first flood discharge and desilting tunnel; 2——the second flood discharge and desilting tunnel; 3——the first left wall; 4——the bottom plate of the first water diversion open channel; 5——the first right wall; 6——the second left wall; 7——the bottom plate of the second water diversion open channel; 8——the second right wall; the direction indicated by the arrow is the direction of water flow. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0029] In the description of the present invention, the terms “first”, “second”, etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

[0030] The utility model provides an inlet structure for a drainage tunnel with two parallel axes. The utility model provides an inlet structure type that can effectively control the flow state of the inlet water, reduce local head loss, and save engineering investment for engineering areas with limited terrain and geological conditions, thereby solving the problem of inlet drainage of the drainage tunnel with two parallel axes.

[0031] See also Figures 1 to 7 The utility model provides a drainage tunnel inlet structure for two parallel axis arrangements, comprising a first left wall 3, a first diversion open channel bottom plate 4, a first right wall 5, a second left wall 6, a second diversion open channel bottom plate 7 and a second right wall 8;

[0032] The first flood discharge and sand discharge tunnel 1 and the second flood discharge and sand discharge tunnel 2 are arranged in parallel with each other in the axis direction, and the first flood discharge and sand discharge tunnel 1 is located on the left side of the second flood discharge and sand discharge tunnel 2; the first right wall 5 and the second left wall 6 are symmetrically arranged at the center position of the entrance of the first flood discharge and sand discharge tunnel 1 and the second flood discharge and sand discharge tunnel 2;

[0033] The first left wall 3 is arranged on the left side of the first right wall 5, and the first water diversion open channel bottom plate 4 is arranged at the bottom of the first right wall 5 and the first left wall 3; the first left wall 3, the first water diversion open channel bottom plate 4 and the first right wall 5 form a first flow passage; the axis of the first flow passage is collinear with the axis of the first flood discharge and sand discharge tunnel 1;

[0034] The second right wall 8 is arranged on the right side of the second left wall 6, and the second water diversion open channel bottom plate 7 is arranged at the bottom of the second left wall 6 and the second right wall 8; the second left wall 6, the second water diversion open channel bottom plate 7 and the second right wall 8 form a second flow passage; the axis of the second flow passage is collinear with the axis of the second flood discharge and sand discharge tunnel 2.

[0035] In the present invention, the inlet front edges of the first right wall 5 and the second left wall 6 are in contact and aligned to form a water flow dividing line. The flow-through surfaces of the first right wall 5 and the second left wall 6 are arc-shaped curved surfaces. The first right wall 5 and the second left wall 6 form a guide wall in the inlet section.

[0036] The first left wall 3 is a lining structure of the slope excavation surface, and adopts a twisted surface arrangement, so that the first flow passage is unidirectionally contracted along the water flow direction.

[0037] The flow surface of the second right wall 8 is an arc-shaped curved surface, and the arc radius of the second right wall 8 is the same as the arc radius of the second left wall 6, so that the second flow channel is symmetrically bidirectionally contracted along the water flow direction. In practical applications, the second right wall 8 has an arc-shaped base.

[0038] It can be seen that the first right wall 5 and the second left wall 6 are arranged symmetrically, and the first left wall 3 and the second right wall 8 are arranged asymmetrically on the plane.

[0039] In the present invention, the inlet front edges of the first left wall 3, the first water diversion open channel bottom plate 4, the first right wall 5, the second left wall 6, the second water diversion open channel bottom plate 7 and the second right wall 8 are flush. The first water diversion open channel bottom plate 4 and the second water diversion open channel bottom plate 7 are arranged horizontally.

[0040] The utility model provides a drainage tunnel inlet structure for two parallel axis arrangements, which is arranged at the inlet positions of the first flood discharge and sand discharge tunnel 1 and the second flood discharge and sand discharge tunnel 2, which are parallel axis arrangements, so that the first flood discharge and sand discharge tunnel 1 and the second flood discharge and sand discharge tunnel 2 share the same drainage tunnel inlet structure. When the water reaches the drainage tunnel inlet structure, it is divided into two left and right streams through the front edges of the first right wall 5 and the second left wall 6; the left stream flows through the first flow passage formed by the first left wall 3, the first water diversion open channel bottom plate 4 and the first right wall 5, and then flows into the first flood discharge and sand discharge tunnel 1; the right stream flows through the second flow passage formed by the second left wall 6, the second water diversion open channel bottom plate 7 and the second right wall 8, and then flows into the second flood discharge and sand discharge tunnel 2.

[0041] In the present application, the first left wall 3 is arranged in a twisted surface type in combination with the slope excavation, and the first flow passage formed with the first right wall 5 is arranged in a unidirectional contraction type on the plane, which can minimize the disturbance of the guide wall on the water flow on the basis of fully combining the terrain;

[0042] The arc radius of the second right wall 8 is consistent with the arc radius of the second left wall 6, and the formed second flow channel is arranged in a symmetrical bidirectional contraction type on the plane. The second right wall 8 and the second left wall 6 have the same degree of influence on the inlet water flow. When the water flows through the second flow channel, it will not be greatly disturbed, which can effectively improve the flow state of the water and reduce local head loss.

[0043] Therefore, the utility model provides a drainage tunnel inlet structure for two parallel axis arrangements, the inlet structure is simple, has a certain aesthetic effect and is convenient for construction; the mountain between the two flood discharge and sand discharge tunnels is retained and the middle guide wall is used for enclosure, which reduces the amount of excavation engineering, saves engineering investment and increases the stability of the mountain between the two flood discharge and sand discharge tunnels; in addition, it can minimize the disturbance of water flow, effectively improve the flow state of water flow, and reduce local head loss. This inlet structure provides design ideas and references for the inlet layout of similar engineering drainage buildings, which is of reference significance.

[0044] The following is an example of a water discharge building inlet structure of a certain project using the technical solution of the utility model, and further explained in conjunction with the accompanying drawings:

[0045] As attached Figure 1As shown in the figure, in a pumped storage power station project, the lower reservoir discharge structure consists of two flood discharge and sand discharge tunnels with parallel axes and the same cavern size. The inlet is a common diversion open channel, which consists of a common diversion open channel section, a lock chamber section, a pressure-free tunnel section, a common discharge chute section, a common stilling pool section, and a common protection tank section. In order to make full use of the terrain and geological conditions, improve the flow pattern of water flow, and reduce local head loss, a common diversion open channel is used for the inlet. In order to ensure good flow patterns at the inlets of the two flood discharge and sand discharge tunnels and prevent siltation, the diversion channel section is expanded and the width is transitioned from 81m to 37.6m. The tail of the diversion open channel is divided into two diversion open channels by the middle guide wall formed by the first right wall 5 and the second left wall 6. The head of the middle guide wall consists of two sections of arc-shaped guide walls with a certain height, namely: the first right wall 5 and the second left wall 6, the arc radius of which is 20m, and the tail is connected to the top plate of the lock chamber with a slope of 1:0.5. From the plane, it is symmetrically distributed.

[0046] The first left wall 3 adopts a twisted surface layout, with a width of 3m at the head and 5m at the tail at the top elevation. When transitioning to the bottom elevation, the head gradually changes from 3m to 12.5m, and the width of the tail remains unchanged. The diversion open channel on the left is the first flow channel, which is arranged in a unidirectional contraction type. The first left wall 3 is a slope excavation surface lining structure. The top of the second right wall 8 adopts an arc-shaped layout, and the radius is the same as the radius of the middle diversion pier, which is 20m. The top of the second right wall 8 is a vertical section, and an arc-shaped base is arranged at the bottom. The base is 3m thick. The top and bottom bases are arranged with a slope transition of 1:0.3. The second flow channel is arranged in a symmetrical bidirectional contraction type on the plane. It has been proven that it can effectively improve the flow state of water, reduce local head loss, and save engineering investment.

[0047] The utility model provides an inlet structure for a drainage tunnel with two parallel axes, which provides a simple structure for engineering areas with limited terrain and geological conditions, and can effectively improve the flow pattern of water flow, reduce local head loss, and save engineering investment, thereby solving the problem of drainage in the inlet of the drainage tunnel with two parallel axes. It provides design ideas and references for the outlet layout of flood discharge buildings in similar projects, which is of reference significance.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A drainage tunnel inlet structure for two parallel axis arrangements, characterized in that: It comprises a first left wall (3), a first water diversion open channel bottom plate (4), a first right wall (5), a second left wall (6), a second water diversion open channel bottom plate (7) and a second right wall (8); The first flood discharge and sand discharge hole (1) and the second flood discharge and sand discharge hole (2) are arranged with their axes parallel to each other, and the first flood discharge and sand discharge hole (1) is located on the left side of the second flood discharge and sand discharge hole (2); the first right wall (5) and the second left wall (6) are symmetrically arranged at the center of the entrances of the first flood discharge and sand discharge hole (1) and the second flood discharge and sand discharge hole (2); The first left wall (3) is arranged on the left side of the first right wall (5), and the first water diversion open channel bottom plate (4) is arranged at the bottom of the first right wall (5) and the first left wall (3); the first left wall (3), the first water diversion open channel bottom plate (4) and the first right wall (5) form a first flow passage; the axis of the first flow passage is collinear with the axis of the first flood discharge and sand discharge tunnel (1); The second right wall (8) is arranged on the right side of the second left wall (6), and the second water diversion open channel bottom plate (7) is arranged at the bottom of the second left wall (6) and the second right wall (8); the second left wall (6), the second water diversion open channel bottom plate (7) and the second right wall (8) form a second flow passage; the axis of the second flow passage is colinear with the axis of the second flood discharge and sand discharge tunnel (2).

2. A drainage tunnel inlet structure for two parallel axis arrangement according to claim 1, characterized in that: The inlet front edges of the first right wall (5) and the second left wall (6) are in contact and aligned to form a water flow dividing line.

3. The drainage tunnel inlet structure for two parallel axis arrangement according to claim 1, characterized in that: The flow surfaces of the first right wall (5) and the second left wall (6) are arc-shaped curved surfaces.

4. A drainage tunnel inlet structure for two parallel axis arrangement according to claim 3, characterized in that: The first left wall (3) is a lining structure of the slope excavation surface, and adopts a twisted surface arrangement, so that the first flow passage is unidirectionally contracted along the water flow direction.

5. The drainage tunnel inlet structure for two parallel axis arrangement according to claim 3, characterized in that: The flow surface of the second right wall (8) is an arc-shaped curved surface, and the arc radius of the second right wall (8) is the same as the arc radius of the second left wall (6), so that the second flow passage is symmetrically bidirectionally contracted along the water flow direction.

6. The drainage tunnel inlet structure for two parallel axis arrangement according to claim 1, characterized in that: The second right wall (8) has an arc-shaped base.

7. The drainage tunnel inlet structure for two parallel axis arrangement according to claim 1, characterized in that: The inlet front edges of the first left wall (3), the first water diversion open channel bottom plate (4), the first right wall (5), the second left wall (6), the second water diversion open channel bottom plate (7) and the second right wall (8) are flush.

8. The drainage tunnel inlet structure for two parallel axis arrangement according to claim 1, characterized in that: The first water diversion open channel bottom plate (4) and the second water diversion open channel bottom plate (7) are arranged horizontally.

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