CN1298935C - Load distribution type drainage building middle pier for eliminating water overflow - Google Patents

Abstract

The present invention relates to a drainage structure, in particular to a middle pier of a load-distributing type elimination water-fin drainage structure, which includes a middle pier body, and the projection of the central axis of the middle pier body along the water flow direction on the horizontal plane is X The positive direction of the axis, the positive direction of the Y axis is the vertical upward direction perpendicular to the X axis, and the intersection point of the X axis and the Y axis is marked as O, and the shape of the cross section of the pier body horizontally parallel to the X axis is arc-shaped at the end For the rectangular surface, the orthographic projection of the outer contour of the tail of the middle pier on the XOY plane has at least one oblique line or curve or a combination of oblique lines and curves. The invention adopts the method of bearing the load caused by the water fins in stages, which can effectively eliminate the water fins of the middle pier and improve the safety performance of the drainage structure.

Description

Load-distributing type eliminates middle piers of hydrofin drainage structures

technical field

The invention relates to a drainage structure, in particular to a middle pier of a load-distributing type eliminating water-fin drainage structure.

technical background

In hydropower engineering buildings, the discharge structures such as flood discharge tunnels are equipped with middle piers. When the water head is high and the flow velocity is high, the tail of the middle pier of the discharge structure often causes the water fins to impact the side wall and the side wall under the action of high-speed water flow. Improper handling will seriously affect the safe operation of flood discharge structures such as flood discharge tunnels. It can be seen from Figures 1 to 3 that the tail of the traditional middle pier 1 is vertically vertical from top to bottom. , the water surface sinks sharply near the middle pier at the tail, resulting in a rebound, which causes a strong impact on the water fin 4; second, the vertical middle pier meets the same section at the tail, and the impact load of the two streams of water 3 is concentrated on the same section. Force is huge, produces strong impact water fin, as shown in Figure 4, Fig. 5, is to use the streamline schematic diagram of traditional middle pier, impact water fin 4 impacts the top of drainage structure, causes the damage of drainage structure.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned defects of the prior art and provide a load distribution type elimination of water-fin drainage structure piers that can effectively eliminate the damage caused by water fins in the piers of drainage structures such as flood discharge tunnels.

The purpose of the present invention is achieved through the following technical solutions.

A middle pier of a load-distributing water-fin drainage structure, which includes a middle pier body, the projection of the central axis of the middle pier body along the water flow direction on the horizontal plane is the positive direction of the X-axis, and the vertical upward direction perpendicular to the X-axis The direction is the positive direction of the Y axis, and the intersection point of the X axis and the Y axis is marked as O. The shape of the cross section of the middle pier body parallel to the X axis is a rectangular surface with an arc-shaped tail, and the outer contour of the tail of the middle pier is on the XOY plane. An orthographic projection has at least one oblique line or one curved line.

The purpose of the present invention can also be further achieved through the following technical solutions.

The above-mentioned middle pier of a load-distributing type eliminating hydrofin drainage structure, wherein the orthographic projection of the outer contour of the tail of the middle pier body on the XOY plane is composed of a vertical line and an oblique line, and the straight line and oblique line The angle α between the lines is an obtuse angle.

The above-mentioned middle pier of a load-distributing type eliminating water fin drainage structure, wherein the orthographic projection of the outer contour of the tail of the middle pier body on the XOY plane is composed of a section of oblique straight line and a section of oblique line, and the oblique line and oblique line The angle α between the lines is an obtuse angle.

The advantage of the present invention is that the technical solution adopted by the present invention is that the tail of the middle pier shrinks in stages from top to bottom to the bottom, and the left and right water flows of the middle pier meet on different sections from top to bottom, and share the two water flows evenly. The impact load can improve the water fin damage caused by the vertical and concentrated contraction of the middle pier, and achieve the purpose of effectively eliminating the water fin of the middle pier, and the effect is remarkable. In water conservancy projects, the use of middle piers of drainage structures is very common. The effectiveness of the invention has been verified by experiments, which can reduce project investment and improve project safety, and has good application prospects.

The objects, advantages, and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings.

Description of drawings

Figure 1 is a schematic diagram of a traditional middle pier.

Fig. 2 is another schematic diagram of the traditional middle pier shape.

Fig. 3 is another schematic diagram of the traditional middle pier shape.

Figure 4 is a schematic view of streamlines using a traditional mid-pier.

Fig. 5 is a cross-sectional view along line A-A of Fig. 4 .

Fig. 6 is a three-dimensional schematic diagram of a middle pier of a first-level load distribution type elimination hydrofin drainage structure.

FIG. 7 is a schematic diagram of the front view of FIG. 6 .

FIG. 8 is a schematic top view of the structure of FIG. 6 .

FIG. 9 is a schematic diagram of the left view of FIG. 6 .

Figure 10 is a schematic view of the streamlines of the pier in the hydrofin drainage structure using the load distribution type.

Fig. 11 is a three-dimensional schematic diagram of a middle pier of a secondary load distribution type eliminating hydrofin drainage structure.

FIG. 12 is a schematic diagram of the front view of FIG. 11 .

FIG. 13 is a schematic top view of the structure of FIG. 11 .

Fig. 14 is a left view structural diagram of Fig. 11 .

Fig. 15 is a three-dimensional schematic diagram of a middle pier of a secondary load distribution type elimination hydrofin drainage structure.

FIG. 16 is a schematic diagram of the front view of FIG. 15 .

FIG. 17 is a top view structural diagram of FIG. 15 .

Fig. 18 is a left view structural diagram of Fig. 15 .

Detailed ways

The core technical route of this invention is that the tail of the middle pier bears the load causing the water fins in stages, reducing the water fins caused by the impact loads of the two streams concentrated on the same section.

Embodiment 1: One-level load distribution type eliminates the middle pier of the hydrofin drainage structure

As shown in Figures 6-10, when the present invention is implemented, the projection of the central axis 5 of the middle pier body along the water flow direction M on the horizontal plane is the positive direction of the X-axis, and the vertical upward direction perpendicular to the X-axis is the Y-axis In the positive direction, the intersection point of the X-axis and the Y-axis is denoted as O, and the middle pier 1 is cast into a cuboid whose tail 2 is an arc slope. , the orthographic projection of the outer contour of the tail on the XOY plane is an oblique straight line 6, the cross section of the middle pier body parallel to the XOY plane is a right-angled trapezoid, the tail of the middle pier gradually extends from top to bottom to form a trapezoid, and runs from head to tail The water flow direction M gradually shrinks into an arc-shaped surface, so that the impact load of the two water flows is dispersed on different sections, so that the load caused by the water fins is borne in stages to achieve the purpose of eliminating the water fins 4 .

Embodiment 2: Two-stage load distribution type eliminates the middle pier of the hydrofin drainage structure

As shown in Figures 11-14, in this embodiment, the middle pier is cast into a cuboid with a circular arc tail, and an arc-shaped tail pad 9 is cast from the bottom to the bottom of the tail cuboid, so that the upper and lower arcs of the tail cuboid The included angle between the shaped tail pads is an obtuse angle α, that is, the orthographic projection of the outer contour line of the tail of the middle pier on the XOY plane is composed of a section of vertical line 7 and a section of oblique line 8, and the straight line 7 and oblique line 8 The included angle α is an obtuse angle. The widest part of the arc-shaped tail pad 9 is the same width as the middle pier body, and the tail of the middle pier gradually extends from top to bottom to form a ladder shape, and gradually shrinks into an arc-shaped surface along the water flow direction M from head to tail. Its working process and principle It is the same as the first embodiment, and will not be repeated here.

Embodiment 3: Two-stage load distribution type eliminates the middle pier of the hydrofin drainage structure

As shown in Figures 15-18, in this embodiment, the middle pier is cast into a cuboid with a circular arc slope at the tail, and arc-shaped tail pads are cast from the lower part to the bottom of the tail cuboid, so that the upper and lower parts of the tail are arc-shaped. The included angle between the tail pads is an obtuse angle α, that is, the orthographic projection of the outer contour of the tail of the middle pier body on the XOY plane is composed of a section of oblique straight line 10 and another section of oblique straight line 11, and the oblique straight line 10 and another oblique line The included angle α of the straight line 11 is an obtuse angle. The widest part of the arc-shaped tail pad 9 is the same width as the middle pier body, and the tail of the middle pier gradually extends from top to bottom to form a ladder shape, and gradually shrinks into an arc-shaped surface along the water flow direction M from head to tail. Its working process and principle It is the same as the first embodiment, and will not be repeated here.

The above-mentioned middle pier is only part of the body shapes. As long as the middle pier is added in any form at the end of the middle pier and gradually extends from top to bottom along the direction of the water flow to the bottom, it belongs to the middle pier of the load distribution type eliminating water fin drainage structure. In addition to the above-mentioned embodiments, the present invention can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims (3)

1. a load distribution type is eliminated pier in the water wing outlet structure escape works, it includes middle pier body, be projected as X-axis positive direction along water (flow) direction at horizontal plane with middle pier body axis, being the Y-axis positive direction perpendicular to X-axis direction straight up, the intersection point of X-axis and Y-axis is designated as O, it is characterized in that: the cross section of middle pier body and X-axis horizontal parallel be shaped as the rectangular surfaces that afterbody is an arc, middle pier afterbody outer contour has one section oblique line or one section curve at least in the orthography of XOY plane.

2. a kind of load distribution type according to claim 1 is eliminated pier in the water wing outlet structure escape works, it is characterized in that: pier body afterbody outer contour is that one section vertical curve and one section oblique line are formed in the orthography of XOY plane in described, and the angle of described straight line and oblique line is the obtuse angle.

3. a kind of load distribution type according to claim 1 is eliminated pier in the water wing outlet structure escape works, it is characterized in that: pier body afterbody outer contour is that one section skew lines and one section oblique line are formed in the orthography of XOY plane in described, and the angle of described skew lines and oblique line is the obtuse angle.

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