CN-116607479-B - Energy dissipation structure taking water level change and flow change into consideration and construction method

CN116607479BCN 116607479 BCN116607479 BCN 116607479BCN-116607479-B

Abstract

The invention discloses an energy dissipation structure and a construction method for considering both water level change and flow change in the technical field of flood discharge energy dissipation and hydraulic construction, comprising side walls; the flood drainage channel section, the energy dissipation stage, the smooth connecting section and the diversion energy dissipation flip-flop section are sequentially arranged between the two side walls along the flow direction of water flow, the diversion energy dissipation base is anchored below the diversion energy dissipation flip-flop section, the top elevation of the diversion energy dissipation base is larger than the flood period low water level of the storage reservoir and smaller than the flood period high water level of the storage reservoir, and the downstream end Gao Chengda of the energy dissipation stage is located at the non-flood period low water level of the storage reservoir and smaller than the non-flood period high water level of the storage reservoir. According to the invention, through the successive energy dissipation of the water flow by the energy dissipation stage and the diversion energy dissipation anti-arc section, the mutual coordination of various energy dissipation modes is realized, and the energy dissipation effect is improved.

Inventors

ZHOU PEIYONG
ZHU XINXING
HUA PENGFEI
WAN LIPIAO
WANG SHUANG
ZHANG DAOFA
LIAO TINGTING

Assignees

上海勘测设计研究院有限公司

Dates

Publication Date: 20260505
Application Date: 20230607

Claims (10)

1. An energy dissipation structure giving consideration to water level change and flow change, comprising: The side wall (1) is arranged on one side of the storage reservoir (8); the energy dissipation stage (2) is arranged between the two side walls (1), and the energy dissipation stage (2) is connected with the slope rock layer (9) in an anchoring manner; the flow-lifting energy dissipation base (3) is arranged below the downstream end of the side wall (1), and the flow-lifting energy dissipation base (3) is connected with the slope rock layer (9) in an anchoring manner; The flow-lifting energy dissipation arc section (4) is arranged between the two side walls (1), and the flow-lifting energy dissipation arc section (4) is connected with the lower flow-lifting energy dissipation base (3) in an anchoring manner; A flood drainage channel section (5), wherein the flood drainage channel section (5) is arranged between two side walls (1), and the flood drainage channel section (5) is positioned at the upstream of the energy dissipation stage (2); The smooth connecting section (6) is arranged between the two side walls (1), the upstream end of the smooth connecting section (6) at a high position is connected with the energy dissipation stage (2), and the downstream end of the smooth connecting section (6) at a low position is connected with the diversion energy dissipation arc-shaped section (4); The flip energy dissipation flip bucket (7) is arranged between the two side walls (1), and the flip energy dissipation flip bucket (7) is fixedly connected with the downstream end of the flip energy dissipation arc section (4); The top elevation of the diversion energy dissipation base (3) is larger than the flood season low water level of the storage reservoir (8) and smaller than the flood season high water level of the storage reservoir and the flood season low water level of the storage reservoir (8), and the downstream end Gao Chengda of the energy dissipation stage (2) is located at the flood season low water level of the storage reservoir (8) and smaller than the flood season high water level of the storage reservoir.
2. The energy dissipation structure capable of achieving both water level change and flow change according to claim 1, wherein drainage blind materials (10) for reducing lifting force are arranged at the bottoms of the flood drainage channel section (5), the energy dissipation platform section (2), the smooth connecting section (6), the flow-picking energy dissipation arc-shaped section (4) and the flow-picking energy dissipation nose ridge (7).
3. The energy dissipation structure capable of achieving both water level change and flow change according to claim 1, wherein a massive stone foot protector (11) is arranged at the downstream of the diversion energy dissipation base (3).
4. The energy dissipation structure capable of achieving both water level change and flow change according to claim 1, wherein the length of the diversion energy dissipation base (3) exceeds 2 m-4 m of the downstream end of the diversion energy dissipation ridge (7), and the bottom elevation of the diversion energy dissipation base (3) is higher than the flood season low water level of the reservoir (8) by 3 m-5 m.
5. The energy dissipating structure for both water level and flow rate according to claim 1, wherein the angle of the flip energy dissipating ridge (7) is 30 °.
6. The energy dissipation structure considering water level change and flow change according to claim 1, wherein the flood drainage channel section (5), the energy dissipation stage (2), the smooth connecting section (6) and the diversion energy dissipation base (3) are connected with a slope rock layer (9) in an anchoring manner through anchoring steel bars (12), and the diversion energy dissipation anti-arc section (4) and the diversion energy dissipation nose ridge (7) are connected with the diversion energy dissipation base (3) in an anchoring manner through the anchoring steel bars (12).
7. The energy dissipation structure with both water level and flow rate changes according to claim 6, wherein the radial dimension of the anchoring steel bar (12) is 25mm, and the anchoring steel bar is 2800mm in construction and 700mm in leakage.
8. A construction method of an energy dissipation structure taking both water level change and flow change into consideration, the construction method being used for the energy dissipation structure taking both water level change and flow change into consideration as set forth in claim 1, characterized in that the construction method includes the steps of: s10, in the water level descending process of the reservoir (8) in the flood season, sequentially constructing a diversion energy dissipation base (3), a massive stone foot protector (11), a diversion energy dissipation arc segment (4) and a diversion energy dissipation nose ridge (7); And S20, in the water level rising process of the water storage reservoir (8) in the non-flood period, the smooth connection section (6), the energy dissipation stage (2) and the flood drainage channel section (5) are constructed successively.
9. The construction method of the energy dissipation structure taking both water level change and flow change into consideration according to claim 8, wherein S10 specifically comprises: s11, synchronously excavating the foundation of the diversion energy dissipation base (3) and the massive stone foot protector (11) in the process that the water level of the reservoir (8) is reduced to the low water level in the flood season; S12, constructing an anchoring steel bar (12) between the diversion energy dissipation base (3) and the slope rock layer (9); s13, paving buried stones of the diversion energy dissipation base (3), and embedding anchoring steel bars between the diversion energy dissipation base (3) and the diversion energy dissipation arc section (4); s14, pouring C20 concrete of the diversion energy dissipation base (3), and throwing and filling the massive stone guard feet (11) when the concrete strength of the diversion energy dissipation base (3) reaches 70% of the design strength; S15, paving drainage blind materials (10) on the diversion energy dissipation base (3), binding reinforcing steel bars of the diversion energy dissipation arc sections (4) and the diversion energy dissipation nose ridge (7), welding the reinforcing steel bars of the diversion energy dissipation arc sections (4) with the anchoring reinforcing steel bars (12), and casting concrete of the diversion energy dissipation arc sections (4) and the diversion energy dissipation nose ridge (7) by standing.
10. The construction method of the energy dissipation structure taking both water level change and flow change into consideration according to claim 8, wherein S20 specifically comprises: s21, foundation excavation of the smooth connecting section (6), the energy dissipation stage (2) and the flood drainage channel section (5) is carried out from bottom to top; s22, performing construction of an anchoring steel bar (12) between the smooth connecting section (6), the energy dissipation stage (2) and the slope rock mass layer (9); s23, paving drainage blind materials (10) at the bottoms of the smooth connecting section (6), the energy dissipation stage (2) and the flood drainage channel section (5); S24, binding the steel bars of the smooth connecting section (6), the energy dissipation stage (2) and the flood drainage channel section (5), and welding the steel bars of the smooth connecting section (6) and the energy dissipation stage (2) with the anchoring steel bars (12); And S25, erecting a mould to perform concrete pouring of the smooth connecting section (6), the energy dissipation stage (2) and the flood drainage channel section (5), and removing the mould when the concrete strength of the smooth connecting section (6), the energy dissipation stage (2) and the flood drainage channel section (5) reaches 70% of the design strength.

Description

Energy dissipation structure taking water level change and flow change into consideration and construction method Technical Field The invention relates to the technical field of flood discharge energy dissipation and hydraulic construction, in particular to an energy dissipation structure and a construction method which give consideration to water level change and flow change. Background The energy dissipation mechanism is an engineering facility which is built in a drainage building and a drop building to prevent or reduce the scouring damage of water flow to a hydraulic building, a downstream canal thereof and the like, and aims to consume and disperse the energy of the water flow. In the hydraulic and hydroelectric engineering, the mountain area flood drainage canal has large specific drop, large annual flow change, huge energy carried when large flow flood is discharged in the flood season, and the flood drainage canal is influenced by the terrain and geological conditions and the surrounding existing buildings, and the concentrated energy dissipation is required to be completed in a shorter range, otherwise, if the flood drainage canal is improperly treated, accidents such as damage to the energy dissipation building, collapse of the side slope and the like can be caused, and the safe and stable operation of the flood drainage canal is influenced. In contrast, in the total engineering investment, the energy dissipation building of the flood discharge channel has a high proportion, and some engineering accounts for even 1/4 of the total engineering investment, so the structural form of the energy dissipation building of the flood discharge channel is a key for guaranteeing the economical rationality and the technical feasibility of the flood discharge channel. When the tail end of the flood discharging canal is connected into an established reservoir, the flood discharging canal has smaller discharge flow, low water flow velocity and short picking distance, and the outflow water hits the bank in the flood period, and the flood discharging canal has large discharge flow, high water flow velocity and long picking distance, strong outflow water impact force, large flushing depth of the reservoir region and easy collapse and instability of the side slopes on the two banks of the reservoir region in the flood period. The energy dissipation forms adopted by the current flood discharging canal energy dissipation building comprise four types of underflow energy dissipation, surface flow energy dissipation, scoop flow energy dissipation and diversion energy dissipation, but the current energy dissipation building can only realize one energy dissipation form, so that the energy dissipation effect is limited, and the use requirement cannot be met more and more. Therefore, how to improve the energy dissipation effect of the energy dissipation building of the flood discharge canal becomes a technical problem to be solved by the person skilled in the art. Disclosure of Invention Therefore, the invention aims to provide an energy dissipation structure with both water level change and flow change, so as to solve the technical problem that the energy dissipation effect of the existing energy dissipation building of the flood discharge canal cannot meet the requirements. The invention adopts the technical scheme that the energy dissipation structure taking the water level change and the flow change into consideration comprises the following components: The side wall is arranged on one side of the reservoir; the energy dissipation stage is arranged between the two side walls and is connected with the slope rock mass layer in an anchoring manner; The flow-picking energy dissipation base is arranged below the downstream end of the side wall and is connected with the slope rock layer in an anchoring manner; The diversion energy dissipation arc section is arranged between the two side walls and is connected with the diversion energy dissipation base below in an anchoring manner; a flood drainage channel section, the flood drainage channel section being disposed between two side walls, and the flood drainage channel section being located upstream of the energy dissipation stage; The smooth connecting section is arranged between the two side walls, the upstream end of the smooth connecting section at a high position is connected with the energy dissipation step section, and the downstream end of the smooth connecting section at a low position is connected with the diversion energy dissipation anti-arc section; the flip energy dissipation flip bucket is arranged between the two side walls and fixedly connected with the downstream end of the flip energy dissipation anti-arc section; The top elevation of the diversion energy dissipation base is larger than the flood season low water level of the storage reservoir and smaller than the flood season high water level of the storage reservoir and the flood season low water level of the