Slope section differential energy dissipation structure

Abstract

A slope section differential energy dissipation structure belongs to the technical field of hydraulic engineering structures and is characterized in that a bottom plate and at least one group of stilling piers are sequentially arranged on a slope section at the upstream of a stilling pool of a release structure from bottom to top. The stilling piers are arranged in a plum blossom shape, and the whole stilling piers are in a barb body shape perpendicular to the water flow direction. The baffle piers enable water flow to turn and collide with each other behind the piers, so that turbulent fluctuation of the water flow is increased, the water flow is divided into a plurality of small water strands, flow velocity distribution is adjusted, the water flow is discharged group by group, friction with the water flow is increased, roughness of a slope section is increased, energy is dissipated along a flow space, energy dissipation efficiency is improved, and downstream scouring of hydraulic structures such as gate dams and the like can be improved. The scouring damage of discharged water flow to the stilling pool, the apron and the riverbed is relieved, the efficient energy dissipation effect is achieved, and the requirements of engineering safety and the like are met.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic engineering structure technology, and in particular relates to a differential energy dissipation structure for slope sections. Background Technology

[0002] With the continuous development of water conservancy projects, the problem of high-speed water flow in spillway structures has become increasingly prominent. In particular, the damage to the downstream energy dissipation system after many years of operation of hydraulic structures has attracted much attention. Utility Model Content

[0003] The purpose of this invention is to provide a differential energy dissipation structure for sloping sections, which can improve energy dissipation efficiency and reduce downstream scouring of hydraulic structures such as dams and gates.

[0004] A differential energy dissipation structure for a sloping section includes a base plate and at least one set of energy dissipation piers. Its features are:

[0005] The base plate and at least one set of stilling piers are arranged sequentially from bottom to top on the sloping section upstream of the stilling basin of the spillway structure.

[0006] At least one set of energy dissipation piers perpendicular to the water flow direction are fixed on the bottom plate.

[0007] Each set of stilling blocks includes multiple stilling blocks arranged in a quincunx pattern. The stilling blocks are generally shaped like barbs perpendicular to the direction of water flow.

[0008] The base slab and at least one set of stilling piers are reinforced concrete structures.

[0009] Multiple expansion joints can be installed on the base plate, and the expansion joints are filled with polyethylene closed-cell foam board or asphalt wood board.

[0010] A plain concrete pad is also provided below the base plate.

[0011] The bottom of the stilling pier is rectangular, and the top of the upstream face slopes towards the direction of water flow, while the top is flat.

[0012] Compared to traditional energy dissipation methods such as bottom flow, jet flow, and surface flow, this differential energy dissipation structure uses one or more sets of stilling piers to turn the water flow and cause it to collide with each other behind the piers, thereby increasing the turbulence of the water flow. This allows the water flow to be discharged in groups, dissipating energy along the flow path and improving energy dissipation efficiency. It has a significant effect on improving the downstream scouring of hydraulic structures such as dams and gates.

[0013] By adopting the above-mentioned structure, this utility model sets one or more sets of energy dissipation piers on the surface of the slope section, increases the roughness of the slope section, increases the friction with the water flow, divides the water flow into many small streams, adjusts the flow velocity distribution, and allows energy to dissipate along the flow space, thereby improving energy dissipation efficiency, saving engineering work and investment, improving downstream scouring of hydraulic structures such as dams and gates, reducing the scouring and damage of the discharged water flow to the energy dissipation pool, seawall and riverbed, achieving the effect of high-efficiency energy dissipation, and meeting the needs of engineering safety. Attached Figure Description

[0014] Figure 1 This is a plan view of the differential energy dissipation structure on the slope section.

[0015] Figure 2 This is a cross-sectional view of the differential energy dissipation structure on the slope section.

[0016] Figure 3 yes Figure 1 A magnified view of the middle left side.

[0017] Figure 4 yes Figure 2 A magnified view of the central part of the image.

[0018] Figure 5 for Figure 4 Enlarged view of part A in the middle.

[0019] In the diagram: 1. Slope section; 2. Stilling basin; 3. Stilling pier; 4. Bottom slab; 5. Subbase; 6. Wing wall. Detailed Implementation

[0020] A differential energy dissipation structure for a sloping section includes a cushion layer 5, a base plate 4, and at least one set of energy dissipation piers.

[0021] Plain concrete cushion layer 5, base slab 4 and at least one set of stilling piers are sequentially set from bottom to top on the sloping section 1 upstream of stilling pool 2 of the spillway structure.

[0022] A base plate 4 is fixedly installed on the pad 5.

[0023] At least one set of energy dissipation piers, which are integral with the bottom plate 4 and are perpendicular to the water flow direction, are fixed on the bottom plate 4.

[0024] Subbase 5 is a plain concrete subbase.

[0025] The base plate 4 is a reinforced concrete slab.

[0026] Furthermore, multiple expansion joints can be installed on the base plate 4.

[0027] A set of energy dissipation piers includes multiple energy dissipation piers 3. The energy dissipation pier 3 is generally shaped like a barbed body perpendicular to the direction of water flow. The top is flat, the upstream is steeper, the top is inclined towards the direction of water flow, and the downstream is more gentle with the water flow. Specifically, the bottom is rectangular and the side is similar to a triangle.

[0028] A set of stilling blocks can include multiple rows (specifically, 4 rows) of stilling blocks, arranged in an alternating sequence of n and n-1 blocks. The first row has n (specifically, 6) stilling blocks, the second row has n-1 (specifically, 5) stilling blocks, the third row has n (specifically, 6) stilling blocks, and the fourth row has n-1 (specifically, 5) stilling blocks. The stilling blocks in the later rows are spaced apart from those in the earlier rows, meaning that the multiple stilling blocks in each set are arranged in a quincunx pattern.

[0029] The spacing between multiple stilling piers 3 in each group is 100cm perpendicular to the water flow direction and 200cm in the direction of water flow front and back. This divides the water flow into many small streams, causing the water flow to turn and collide with each other behind the piers, thereby increasing the water flow turbulence effect, improving energy dissipation efficiency, and saving engineering work and investment.

[0030] One or more sets of energy dissipation piers can be set according to the length of the slope section.

[0031] When there are multiple groups of stilling piers, the distance L1 between each group of stilling piers is 1 to 2 times the width B of the slope section 1, so that the water flows smoothly and is discharged one group at a time.

[0032] Both the base slab 4 and the stilling pier 3 are reinforced concrete structures. The base slab 4 is 50cm thick and can have multiple expansion joints. The expansion joints are filled with polyethylene closed-cell foam board or asphalt wood board, etc. The concrete strength grade is not lower than C25 and the steel reinforcement grade is III.

[0033] The foundation layer 5 is a plain concrete structure with a thickness of 10cm and a concrete strength grade of not less than C10.

[0034] Wing wall 6 is a retaining wall on both sides of the slope section 1, the cushion layer 5 and the bottom slab 4. The structural type can be reinforced concrete, masonry structure or natural rock mass, etc.

[0035] The distance L2 between the last set of stilling piers 3 and stilling pool 2 is 1 to 2 times the width B of the slope section 1, so that the water flows smoothly down to the stilling pool.

[0036] If the stilling block 3 is too high, the water jet will overturn the wing wall 6; if the stilling block 3 is too low, it will not have the effect of energy dissipation.

[0037] Specifically, a single stilling pier 3 has a width of 100cm along the slope section 1 in the direction of width B, a top width of 20cm in the vertical direction, and a height of 50cm (i.e., the height from the midpoint of the top of the stilling pier 3 to the surface of the bottom slab 4). The upstream slope ratio is 1:0.5. Figure 4 As shown in a:b), the downstream slope ratio is 1:1 ( Figure 4 c:d (as shown in the diagram).

[0038] All other parts not described in detail are existing technology.

Claims

1. A differential energy dissipation structure for a sloping section, comprising a base plate (4) and at least one set of energy dissipation piers; characterized in that: The bottom plate (4) and at least one set of stilling piers are set from bottom to top on the sloping section (1) upstream of the stilling pool (2) of the spillway structure; At least one set of energy dissipation piers perpendicular to the water flow direction are fixed on the bottom plate (4); Each set of stilling blocks includes multiple stilling blocks (3) arranged in a quincunx pattern. The stilling blocks (3) are generally in the shape of barbed bodies perpendicular to the direction of water flow.

2. The differential energy dissipation structure for a sloping section according to claim 1, characterized in that: The base plate (4) and at least one set of energy dissipation piers are reinforced concrete structures.

3. The differential energy dissipation structure for a sloping section according to claim 1, characterized in that: Multiple expansion joints are set on the base plate (4), and the expansion joints are filled with polyethylene closed-cell foam board or asphalt wood board.

4. The differential energy dissipation structure for a sloping section according to claim 3, characterized in that: The thickness of the base plate (4) is 50cm, and multiple expansion joints can be set on the base plate (4).

5. The differential energy dissipation structure for a sloping section according to claim 1, characterized in that: A padding layer (5) is also provided below the base plate (4).

6. The differential energy dissipation structure for a sloping section according to claim 5, characterized in that: The subbase (5) is a plain concrete subbase.

7. A differential energy dissipation structure for a sloping section according to claim 6, characterized in that: The thickness of the padding layer (5) is 10cm.

8. The differential energy dissipation structure for a sloping section according to claim 1, characterized in that: The bottom of the stilling block (3) is rectangular, the top of the upstream face is inclined towards the direction of water flow, and the top is flat.

9. A differential energy dissipation structure for a sloping section according to claim 1, characterized in that: When multiple energy dissipation piers (3) in each group are arranged in rows, the spacing between the energy dissipation piers (3) in each row is 100cm perpendicular to the water flow direction and 200cm between them in the direction of water flow. When there are multiple sets of energy dissipation piers, the distance L1 between each set of energy dissipation piers is 1 to 2 times the width B of the slope section (1); The distance L2 between the stilling basin (2) and the nearest stilling pier (3) is 1 to 2 times the width B of the slope section (1); A single energy dissipation pier (3) has a width of 100cm along the slope section (1) in the B direction, a top width of 20cm in the vertical direction, a pier height of 50cm, an upstream slope ratio of 1:0.5, and a downstream slope ratio of 1:

1.

10. A differential energy dissipation structure for a sloping section according to claim 1, characterized in that: The multiple stilling blocks (3) in each group are arranged in multiple rows, with n blocks and n-1 blocks in sequence.

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