CN110284467A - A kind of asymmetric open spillway - Google Patents

Abstract

The invention discloses an asymmetrical open spillway, which comprises a diversion channel, an overflow weir, a chute, an outlet energy dissipation section and a tailwater channel. The asymmetrical WES overflow weir surface structure composed of the overflow weir on the right and the overflow weir on the right. It is respectively connected with the overflow weir on the left and the overflow weir on the right. The left and right drains are of asymmetrical structure, and the ends of the left and right drains are connected with vertical drops. The ridge is connected with the chute of the transition section, which is the adjustment area of the discharge flow under the side weir, and its plane projection is asymmetrical "Y" shape. The structure can make full use of the terrain and geological conditions, maximize the length of the overflow weir, and reduce the excavation volume while reducing the excavation slope and project investment.

Description

An asymmetrical open spillway

technical field

The invention relates to a water conservancy and hydroelectric project discharge structure, in particular to an asymmetrical open spillway.

Background technique

The spillway is a common water discharge structure, which is used to vent the flood that cannot be accommodated by the planned storage, prevent the flood from overflowing the top of the dam, and ensure the safety of the dam. Therefore, in water conservancy and hydropower projects, drainage structures must be provided. An open floodway refers to a bank-type spillway with a free water inlet and an open channel for discharge. It can adapt to a wide range of discharge volume and drop, and has a strong excess discharge capacity. It is widely used in water conservancy and hydropower projects. .

The open spillway is divided into the main channel type spillway, the side channel type spillway and other types. The main channel spillway is usually composed of diversion channel, overflow weir (control section), discharge channel, outlet energy dissipation section and tailrace channel. Due to terrain and geological conditions, the overflow weir often cannot be close to the bank of the reservoir. It is necessary to dig a diversion channel in front of the overflow weir to guide the reservoir water to the overflow weir smoothly. The side channel spillway is generally composed of overflow weir, side channel, discharge channel and outlet energy dissipation section. The overflow weir is roughly arranged along the contour line of the river bank. After the water flows through the overflow weir and discharges into the side groove roughly parallel to the weir, it turns 90° in the groove and flows downstream through the discharge groove. When the hilltop at the dam site is high and the bank slope is steep, limited by terrain, geology, discharge capacity and other conditions, the excavation volume of the spillway side slope of the traditional main channel and side channel is relatively large, and it is easy to form a high slope, especially for some unfavorable areas. Geological conditions are likely to cause slope instability, which is difficult to deal with.

Contents of the invention

The purpose of the present invention is to provide an asymmetrical open spillway, which has a simple structure and can make full use of terrain and geological conditions to maximize the length of the overflow weir, while reducing the amount of excavation and reducing the excavation margin. slope, thereby solving the problems existing in the prior art.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: an asymmetric open spillway, including a diversion channel, an overflow weir, a chute, an outlet energy dissipation section and a tailrace channel. The asymmetrical WES overflow weir surface structure is composed of the flow weir, the overflow weir of the middle arc section and the right overflow weir. The side chute and the right side chute are respectively connected with the left overflow weir and the right overflow weir, the left side chute and the right side chute are asymmetric structures, The ends of the right side chute are all connected to the vertical drop sill, which is connected to the chute of the transition section, which is the adjustment area of the discharge flow under the side weir, and its plane projection is an asymmetrical "Y" shape.

The left lateral chute and the right lateral chute are trapezoidal cross-sections.

The upstream of the overflow weir is a vertical surface along the water surface.

The water-facing surfaces of the chute in the transition section are all vertical surfaces.

The overflow weir surface of the overflow weir is composed of three sections of arc surface connected to the WES curve surface and a straight slope surface with a slope ratio of 1:0.7.

The vertical slope ratio of the bottom plate of the left and right lateral chute from the beginning to the end of the chute is 10%.

The beneficial effects of the present invention are: making full use of terrain and geological conditions, maximizing the length of the overflow weir; reducing excavation volume, reducing excavation side slopes, and reducing engineering quantities for side slope treatment; and reducing engineering investment.

Description of drawings

Fig. 1 is a partial plan view of an asymmetric open spillway of the present invention;

Fig. 2 is A-A sectional view among Fig. 1;

Fig. 3 is B-B sectional view among Fig. 1;

Fig. 4 is C-C sectional view among Fig. 1;

Among them: 1——left overflow weir; 2——overflow weir of middle arc section; 3——right overflow weir; 4——left lateral discharge chute; 5—right lateral discharge chute; 6 ——Transition section chute; 7——Vertical drop sill; The direction indicated by the arrow is the direction of water flow.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention.

As shown in Figures 1-4, the asymmetric open spillway of the present invention includes a diversion channel, an overflow weir, a chute, an outlet energy dissipation section and a tailrace channel, and the overflow weir is composed of the left overflow weir 1, the middle The asymmetrical WES overflow weir surface structure composed of the arc section overflow weir 2 and the right overflow weir 3, the discharge channel is composed of the left lateral discharge channel 4, the right lateral discharge channel 5 and the transition section discharge channel 6, The left lateral chute 4 and the right lateral chute 5 are connected to the left overflow weir 1 and the right overflow weir 3 respectively, and the left lateral chute 4 and the right lateral chute 5 are asymmetric structures, The end of the left side chute 4 and the end of the right side chute 5 are both connected to the vertical sill 7 and connected to the transition section chute 6. The transition section chute 6 is the discharge flow adjustment area for the side weir, and its plane projection is asymmetrical "Y" type.

Preferably, the left chute 4 and the right chute 5 are trapezoidal in cross section. The upstream of the overflow weir is a vertical surface along the water surface. The water-facing surfaces of the transition section chute 6 are all vertical surfaces.

The overflow weir surface of the overflow weir is composed of three sections of arc surface connected to the WES curve surface and a straight slope surface with a slope ratio of 1:0.7.

The left side chute 4 and the right side chute 5 are connected to the left overflow weir 1 and the right overflow weir 3 respectively, and the longitudinal slope ratio of the floor from the end to the end is 10%.

The invention can make full use of terrain and geological conditions, maximize the length of the overflow weir, reduce the excavation volume, reduce the excavation side slope, and reduce engineering investment.

Below take the certain project spillway that has adopted technical scheme of the present invention as example, further explanation in conjunction with accompanying drawing:

As shown in Figure 1, a spillway project is located at the mouth of the south side of the reservoir, the ground elevation is 165m, and the terrain gradually becomes steeper on both sides, with a slope of 20-40°. The terrain on the left and right banks of the spillway is relatively steep, the rock mass is exposed, and the bedrock integrity is good. Through surface surveying and drilling exploration, no structural plane with a gently dipping angle that is not conducive to the stability of the slope on both banks is found. Although there are cracks along the slope, their The dip angle is steep, and the rock masses on both sides are basically stable.

The spillway is composed of diversion channel, overflow weir, discharge chute, outlet energy dissipation section and tailrace channel, and the overflow weir is composed of left overflow weir, right overflow weir, middle arc section overflow weir, left lateral discharge chute , the right side to the chute, and the transition section of the chute. and so on.

In order to make full use of the terrain and geological conditions, overflow side weirs and lateral discharge channels are arranged along both sides of the pass along the topography. The axis of overflow weir 1 on the left is NE102°, the axis of overflow weir 3 on the right is NE25°, and the middle is connected by an arc (overflow weir 2 in the middle arc section), the radius of the arc is 5.6m, and the central angle is 103°20 '48". The weir width on the left and right sides of the overflow weir crest is 35.0m, the weir width in the middle arc section is 25.0m, and the total width of the side weirs is 95.0m.

The upstream of the overflow weir is a vertical surface along the water surface, and the overflow weir surface is composed of three sections of arc surface connected to the WES curve surface and a straight slope surface with a slope ratio of 1:0.7. The radiuses of the three arcs of the weir surface are 70mm, 349mm and 871mm respectively, and the WES power curve is: x ^1.85 = 3.207y.

The lateral discharge channel of the spillway is connected with the overflow weir. The discharge channels 3 and 4 on the left and right sides are trapezoidal cross-sections. The bottom elevation of the first end is 161.5m and the width is 5.0m; than 10%. The ends of the side chute on both sides are connected to the vertical sill 7 with a height of 2.0m, which is connected with the middle confluence chute, that is, the transition section chute 6, and its floor elevation is 156.0m.

The chute 6 in the transition section is mainly the discharge flow adjustment area under the side weir. Its plane projection is asymmetrical "Y" shape, its bottom plate elevation is 156.0m, and its horizontal length along the longitudinal centerline of the chute is 57.5m. The water-facing surface of the chute in the transition section is vertical, the width of the end chute is 25.0m, and the thickness of the bottom plate is 3.0m.

By adopting the invention, the topography and geological conditions of the pass are fully utilized, and the overflow weir is arranged to the greatest extent, while reducing the excavation volume, the excavation side slope is reduced, and the project investment is reduced.

The above-described embodiments are only used to illustrate the technical ideas and characteristics of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The present invention cannot be limited only by this embodiment. The scope of the patent, that is, all equivalent changes or modifications made to the spirit disclosed in the present invention still fall within the scope of the patent of the present invention.

Claims (6)

1. a kind of asymmetric open spillway, including flume, overflow weir, let out slot, energy dissipation below spillway section and tailwater channel, feature Be, overflow weir be made of left side overflow weir (1), intermediate arc section overflow weir (2) and right side overflow weir (3) it is asymmetric WES overflow weir structure, lets out slot from left side to letting out slot (4), right side to letting out slot (5) and changeover portion is let out slot (6) and constituted, and left side is to letting out Slot (4) and right side connect respectively with left side overflow weir (1) and right side overflow weir (3) to letting out slot (5), and left side is to letting out slot (4) and the right side Laterally letting out slot (5) is asymmetric structure, and bank is vertically fallen to letting out slot (5) end and connect to letting out slot (4) end and right side in left side (7), slot (6) is let out with changeover portion to connect, it is the stream adjustment region that sluices under side weir that changeover portion, which lets out slot (6), and plane projection is not right Claim Y-shaped.

2. asymmetric open spillway according to claim 1, which is characterized in that the left side is to letting out slot (4) and right side It is trapezoidal transverse face to slot (5) are let out.

3. asymmetric open spillway according to claim 1, which is characterized in that the overflow weir upstream is lead along the water surface It faces directly.

4. asymmetric open spillway according to claim 1, which is characterized in that the changeover portion lets out slot (6) upstream face It is vertical face.

5. asymmetric open spillway according to claim 3, which is characterized in that the overflow weir of the overflow weir is by three Section arc surface connects WES curvilinear plane and the straight slope surface composition of slope ratio 1:0.7.

6. asymmetric open spillway according to claim 1 or claim 2, which is characterized in that the left side is to letting out slot (4) and the right side The first chute bottom slab longitudinal direction slope to end end in slot (5) end is laterally let out than 10%.