CN205276227U - Air -entraining structure for flood releasing building - Google Patents

Abstract

The utility model discloses an aerated structure, in particular to an aerated structure used for flood discharge buildings. The utility model provides an aeration structure for a flood discharge building that can promote the aeration of the side water flow without affecting the aeration effect of the bottom water flow. Flow aeration structure, the aeration well corresponds to the baffle aeration structure; there is an aeration sill on the bottom plate, taking the water flow direction as a reference, in the width direction, the middle part of the aeration sill is higher than the two sides; the aeration sill and the ventilation corresponding to the well. Using the principle of jet impact, the height of the end of the middle part of the aeration sill at the bottom and the jetting angle of the bottom water flow are appropriately increased. Through small changes in the water inlet position and the intersection angle of the bottom water flow and the bottom plate, not only the backwater blockage in the bottom cavity can be effectively suppressed, but also the split water droplets in the cavity areas on both sides can be quickly drained.

Description

Air-entrained structures for flood discharge structures

technical field

The utility model relates to an aeration structure, in particular to an aeration structure used for flood discharge buildings.

Background technique

In recent years, combined with the characteristics of large single-width flow and high flow velocity in the Ertan Project, engineering measures to strengthen the aeration and corrosion reduction protection of the side walls have been studied, and it is found that the deflected aeration sills are set on the side walls of the flood discharge structures. The air entrainment concentration of the water flow near the side wall can be greatly increased. There is no cavitation damage to the side wall after the side water flow aeration technology is adopted at the anti-arc end of the 1# flood discharge tunnel in Ertan, which shows that the side water flow aeration has a good corrosion protection effect on the side wall. However, the model test shows that setting the side wall deflected aeration sill will indeed reduce the aeration concentration in the center of the bottom plate downstream of the sill, and this phenomenon is especially obvious when operating at a higher water level.

Utility model content

The technical problem to be solved by the utility model is to provide an aeration structure for flood discharge structures that can promote aeration of side water flow without affecting the aeration effect of bottom water flow.

The aeration structure used in the utility model for solving the technical problems of the flood discharge structure includes side walls, bottom plates and ventilation wells, the side walls are provided with baffle aeration structures, and the aeration wells and baffle aeration wells are arranged on the side walls. corresponding to the gas structure; the bottom plate is provided with an aeration sill, and the aeration sill corresponds to the aeration well. Taking the water flow direction as a reference, in the width direction, the top surface of the aeration sill is divided into three sections, which are respectively The middle convex surface in the middle and the two gentle slope pressure-increasing surfaces on both sides, the gentle slope pressure-lifting surfaces gradually rise from the edge to the middle and finally smoothly connect with the middle convex surface.

Further, the two gentle-slope boosting surfaces are arranged symmetrically, and the width ratio of the middle convex surface to the two gentle-slope boosting surfaces is 1-3:1:1.

Furthermore, in the direction of water flow, the slopes of the two gentle slope boosting surfaces are smaller than the slope of the middle convex surface.

Further, in the direction of water flow, the minimum slope of the two gentle slope boosting surfaces is i ₂ ; the slope of the middle convex surface is i ₁ , i ₁ /i ₂ =1.5-3.

Further, a raised ridge is provided on the bottom plate, the upstream of the raised ridge is higher than the downstream, and the end of the aeration ridge is flush with the upstream end of the raised ridge.

Further, the end of the air-entrainment sill is flush with the end of the deflected air-entrainment structure.

Further, the ventilation is connected to the high and low junction of the challenge.

The beneficial effects of the utility model are: using the principle of jet impact, the height of the end of the middle part of the bottom aeration sill and the shooting angle of the bottom water flow are appropriately increased, and the pressure-lifting surface on both sides is gradually reduced by a gentle slope, forming the largest middle length, and moderately symmetrical shortening on both sides Bottom aeration cavity. Through small changes in the water inlet position and the intersection angle of the bottom water flow and the bottom plate, not only the backwater blockage in the bottom cavity can be effectively suppressed, but also the split water droplets in the cavity areas on both sides can be quickly drained. The shape of the bottom cavity is stable and the ventilation is smooth without affecting the aeration of the side water flow, thereby strengthening the aeration and corrosion protection of the entire flow surface.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the front view of aeration sill;

Fig. 3 is the side view of aeration sill;

Fig. 4 is the top view of aeration ridge;

Figure 5 is a partial schematic diagram of a flood discharge tunnel;

Parts, parts and numbers in the figure: side wall 1, bottom plate 2, ventilation shaft 3, baffle aeration structure 4, aeration ridge 5, pick ridge 6, middle convex surface 51, gentle slope boosting surface 52.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the direction of water flow is from left to right in Figure 1, and Figure 2 is a view towards the incoming water direction; The baffle aeration structure 4, the aeration well 3 corresponds to the baffle aeration structure 4; the bottom plate 2 is provided with an aeration ridge 5, and the aeration ridge 5 corresponds to the aeration well 3, in the direction of water flow For reference, in the width direction, the top surface of the aeration sill 5 is divided into three sections, as shown in FIG. The boosting surface 52 gradually rises from the edge to the middle and finally smoothly connects with the middle convex surface 51 . The air-entrained structure is used in flood discharge buildings, such as flood discharge tunnels. The baffle aeration structure 4 on the side wall 1 and the aeration sill 5 on the bottom plate 2 jointly realize a good three-dimensional aeration effect on the water flow surface. In the process of flood discharge and drainage, the water flow rate is fast. According to Bernoulli’s principle, through the turbulent dispersion of the water flow surface on the side wall side and the swirl of the bottom water flow, the baffle aeration structure 4 and the aeration sill 5 will flow from the aeration well. 3 Inhale a large amount of air to achieve the purpose of aeration and corrosion reduction. The aeration sill 5 of this aeration structure has its own characteristics. It utilizes the principle of water jet impact, and by increasing the height of the middle part of the aeration sill 5 and the angle of the bottom water flow, the height of the two sides of the aeration sill 5 is gradually reduced, so that the water tongue The middle length of the bottom of the air-entrained cavity formed after slinging is the longest, and the two sides are moderately and symmetrically shortened, which not only effectively inhibits the backwater blockage in the bottom cavity, but also quickly drains the split water droplets in the cavity areas on both sides, maintaining the bottom The shape of the cavity is stable and the ventilation is smooth, thereby ensuring the aeration effect of the bottom plate water flow downstream of the bottom sill under the condition of side water flow aeration.

Specifically, as shown in FIG. 2 and FIG. 4 , in the width direction, the top surface of the aeration sill 5 is divided into three sections, which are the central convex surface 51 in the middle and two gentle slope boosting surfaces 52 on both sides. Both the middle convex surface 51 and the gentle slope boosting surface 52 rise gradually along the water flow, but the slope of the middle convex surface 51 is larger than the gentle slope boosting surface 52 . The gentle slope boosting surface 52 is also an inclined surface in the lateral direction, thereby gradually combining with the middle convex surface 51, which makes the aeration sill 5 change in the water flow direction, lateral direction and height direction, so that the flow of the water flow is differentiated, which is beneficial to improving the aforementioned Aerated effect. It is recommended that the two gentle slope boosting surfaces 52 are arranged symmetrically, and the width ratio between the middle convex surface 51 and the two gentle slope boosting surfaces 52 is 1˜3:1:1. In the direction of water flow, the minimum slope of the two gentle slope boosting surfaces 52 is i ₂ , the slope of the middle convex surface 51 is i ₁ , i ₁ /i ₂ =1.5-3.

In order to better inhale air, as shown in Figure 1, the base plate 2 is provided with a pick-up ridge 6, the upstream of the pick-up ridge 6 is higher than the downstream, and the end of the aeration ridge 5 is connected to the end of the pick-up ridge 6 upstream. Evenly, the high and low junctions of the ridge 6 can just form a space, so as to facilitate air inhalation. The end of the aeration ridge 5 is flush with the end of the baffle aeration structure 4 , and the ventilation is connected to the high and low junction of the raised ridge 6 . Both the aeration ridge 5 and the baffle aeration structure 4 can inhale air at the high and low junction of the ridge 6 .

Example

Taking a flood discharge tunnel as an example, as shown in Figure 5, three types of aerated structures for flood discharge structures were set up, and several points were selected for detection.

Body type 1: baffle aeration structure 4 without side wall 1, aeration sill 5 without bottom plate 2, which is a conventional bottom aeration sill;

Body type 2: baffled aerated structure 4 with side wall 1, aerated sill 5 without bottom plate 2;

Body type 3: the baffle aeration structure 4 with the side wall 1, and the aeration sill 5 with the bottom plate 2, which is the aeration structure.

The model test carried out comparative experiments on three types of aeration gas, and the aeration concentration of the bottom water flow downstream of the aeration sill in the three measured cases is shown in Table 1 below.

Table 1

Remarks: Refer to Figure 5 for the measuring point numbers.

CC20, CC21, CC23, CC24, CC25 indicate the measuring points at the bottom plate downstream, CL24, CL25, CR36, CR37 indicate the measuring points at side wall 1.

It can be seen from the above comparative experiments that:

1) Setting deflected aeration sills (type 2 and 3) on the side walls of flood discharge structures can greatly increase the aerated concentration of the water flow near the side walls, but setting up conventional side wall deflectors and aeration sills (type 2 ) will indeed reduce the air entrainment concentration in the center of the bottom plate downstream of the sill (compared to body type 1), and this phenomenon is especially obvious when operating at a higher water level.

2) For the body type 3 adopting the aeration structure of the present utility model, the gas concentration at the bottom plate is completely better than that of the body type 2, which is equivalent to that of the body type 1. The aeration concentration at side wall 1 is mostly better than that of body type 2 when operating at a higher water level, and completely better than body type 1. On the whole, the aeration structure of the utility model not only ensures the aeration concentration of the side wall 1 but also improves the aeration concentration of the bottom plate. Corrosion protection.

Claims (7)

1. for the aeration structure of flood releasing structure, including abutment wall (1), base plate (2) and ventilation well (3), being provided with baffling aeration structure (4) on described abutment wall (1), described ventilation well (3) is corresponding with baffling aeration structure (4); It is characterized in that: described base plate (2) is provided with aerator (5), described aerator (5) is corresponding with ventilation well (3), with water (flow) direction for reference, in the direction of the width, the end face of aerator (5) is divided into three sections, being in the middle convex surface (51) at middle part respectively and be positioned at the boosting face, two gentle slopes (52) of both sides, boosting face, described gentle slope (52) is gradually risen and final and middle convex surface (51) smooth connection to centre by edge.

2. the aeration structure for flood releasing structure as claimed in claim 1, it is characterized in that: boosting face, two gentle slopes (52) is symmetrical arranged, the width ratio in middle convex surface (51) and boosting face, two gentle slopes (52) is 1��3:1:1.

3. the aeration structure for flood releasing structure as claimed in claim 1, it is characterised in that: in water (flow) direction, the gradient in boosting face, two gentle slopes (52) is respectively less than the gradient of middle convex surface (51).

4. the aeration structure for flood releasing structure as claimed in claim 1, it is characterised in that: in water (flow) direction, the minimum grade in boosting face, two gentle slopes (52) is i₂; The gradient of middle convex surface (51) is i₁, i₁/i₂=1.5��3.

5. the aeration structure for flood releasing structure as described in Claims 1-4 any claim, it is characterized in that: described base plate (2) is provided with and chooses bank (6), choosing the upstream of bank (6) higher than downstream part, the end of described aerator (5) is concordant with the end choosing bank (6) upstream end.

6. the aeration structure for flood releasing structure as claimed in claim 5, it is characterised in that: the end of aerator (5) is concordant with the end of baffling aeration structure (4).

7. the aeration structure for flood releasing structure as claimed in claim 5, it is characterised in that: described venting communication is to the height intersection choosing bank (6).