A construction method for energy dissipation and anti-scour overflow weir
By adopting a multi-stage energy dissipation design and structural arrangement in a small overflow weir, the problem of insufficient energy dissipation in the prior art is solved, significantly reducing the impact of water flow, protecting the safety of the structure and riverbed, and extending the service life.
Patent Information
- Application Number
- CN202510147932.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-11
- Publication Date
- 2025-04-04
AI Technical Summary
The existing small overflow weirs have insufficient energy dissipation, which leads to excessive water flow energy, affecting structural safety, and the riverbed still has a large flush.
It adopts a multi-stage energy dissipation design, including the inner water surface, concave surface, outer water surface and inflow channel, combined with the arrangement of pebbles and comb-toothed plates, and dissipates and consumes water flow energy through the design of the inflow channel and energy dissipation slope.
It significantly reduces the impact of water flow on the weir and riverbed, protects structural safety and riverbed stability, extends the service life of the overflow weir, and reduces maintenance costs.
Smart Images
Figure CN119754225A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of water conservancy facilities, and in particular to a construction method of an energy dissipation and anti-scour overflow weir. Background Art
[0002] Overflow weirs are commonly used water retaining and water discharge structures in water conservancy projects. They are widely used in various water conservancy projects. Most of them adopt natural overflow, that is, no gate control is set. This overflow method is simple and feasible, and the engineering cost is relatively low. It is widely used in some small water conservancy projects. This type of overflow weir mainly faces the technical problems of overflow volume and energy dissipation. The overflow volume is mainly determined by factors such as the height and width of the overflow weir top, while energy dissipation is mainly the control of the energy of the water volume passing through the overflow weir. If the energy control is poor, it will cause excessive water flow energy and even affect the safety of the structure. Existing small overflow weirs mostly use flat overflow weirs and arc overflow weirs. Flat overflow weirs are simple to construct and have low cost, but their energy dissipation means are limited. Although the arc overflow weir has a certain energy dissipation effect, its engineering cost is high, and the setting of a single arc has limited energy dissipation effect. The downstream riverbed still has a large scouring, that is, the energy dissipation of the weir body is limited, and the energy is mainly dissipated through the scouring of the water flow.
[0003] In the prior art, CN111910587A provides a special-shaped overflow weir, which forms the main structural form of the weir body by arranging a water-facing surface, a first water-passing surface, a first vertical surface, a second water-passing surface and a second vertical surface, and respectively arranges a convex surface on the first water-passing surface and the second water-passing surface, and arranges a concave surface on the second vertical surface, forming an energy dissipation mode in which convex and concave surfaces cooperate, thereby improving the energy dissipation effect of the overflow weir.
[0004] The above technical solution solves the energy dissipation problem of the overflow weir to a certain extent, but the water flow still has a high drop after falling from the second water surface, and the water can only be deflected inward by the adsorption force of water to cause the water to be deflected on the outer wall of the weir body near the second vertical surface, while most of the water flow still rushes downward at a high speed, causing impact on the bottom of the riverbed outside the overflow weir, thereby causing damage to it. Summary of the invention
[0005] In order to solve the problem of the prior art causing impact on the riverbed, the present invention provides a method for constructing an energy dissipation and anti-scour overflow weir.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A method for constructing an energy dissipation and anti-scour overflow weir comprises the following steps: 1) Construction preparation; 2) Foundation treatment; 3) Construction of cushion layer; 4) Construction of steel bars and embedded parts; 5) Installation of gate hoist; 6) Concrete pouring of dam body; 7) Comb plate installation; 8) Cobblestone laying; During construction, the inner water surface, concave surface and outer water surface are shaped by templates with the same shape as the inner water surface, concave surface and outer water surface. When pouring the weir body, plastic pipes or other material pipes with the same shape as the inner flow channel are pre-buried in the steel bars, and then poured. The two ends of the plastic pipe are sealed. After the pouring is completed, the seals are removed. The recoil port is also arranged in advance with a plastic pipe. Then the gate frame, hoist and gate are installed, as well as the front mounting frame and comb plate. After installation, pebbles are arranged on the energy dissipation slope and in the energy dissipation pool to complete the construction.
[0007] The energy dissipation and scour-resistant overflow weir construction method described herein relates to an energy dissipation and scour-resistant overflow weir, comprising a weir body, an inner water-passing surface is arranged at the upper end of the water-facing side of the top of the weir body, a concave surface is arranged on the outer side of the inner water-passing surface, an outer water-passing surface is arranged on the outer side of the concave surface, the inner water-passing surface is higher than the outer water-passing surface, the outer water-passing surface is higher than the concave surface, an inner flow channel connected to the concave surface at the upper part and connected to the middle part of the weir body at the lower part is arranged in the weir body, the end of the inner flow channel is a discharge port tilted upward, an energy dissipation slope is arranged on the weir body at the lower part of the outer side of the outer water-passing surface, an inward-retracting platform is arranged at the lower part of the energy dissipation slope, the inward-retracting platform is located at the upper part of the energy dissipation pool, the inward-retracting platform is recessed into the weir body, and the inward-retracting platform A mounting frame is fixedly installed on the platform by mounting bolts, and the mounting frame is matched and arranged in the retracted platform. The function of the mounting frame is to install a comb plate; a comb plate is fixedly installed on the mounting frame, and the upper end of the comb plate is close to the lower end of the energy dissipation slope and is an inclined or vertical structure toward the energy dissipation slope. An energy dissipation pool is provided at the bottom of the weir body below the energy dissipation slope, and a pool flow surface is provided on the outside of the energy dissipation pool. A recoil port is opened on the weir body at the bottom of the energy dissipation pool, and the recoil port is connected to the bottom of the water-facing surface of the weir body. A guide groove is provided on the water-facing surface of the weir body, and a gate is slidably embedded in the guide groove. A hoisting screw is connected to the upper end of the gate, and the hoisting screw is slidably installed on the gate frame. A hoisting machine is installed on the gate frame, and the hoisting machine and the hoisting screw are engaged.
[0008] In the energy dissipation and anti-scour overflow weir construction method, a nylon rubber tube is arranged in the inner flow channel, and the nylon rubber tube is a rubber tubular structure with a nylon rope arranged inside along the length direction of the tube.
[0009] In the energy dissipation and anti-scour overflow weir construction method, pebbles are located in the energy dissipation pool.
[0010] Compared with the prior art, the beneficial effects of the invention are: (1) The multi-stage energy dissipation design significantly reduces the impact of water flow on the weir and riverbed, effectively protecting the structural safety and riverbed stability.
[0011] (2) Through the design of the internal flow channel, part of the water flow can be dispersed, reducing the amount of water directly impacting the energy dissipation slope, thereby reducing the burden on the energy dissipation slope and extending its service life.
[0012] (3) The pebbles arranged on the energy dissipation slope play a good role in energy consumption and at the same time avoid direct erosion of the slope by water flow.
[0013] (4) The design of the comb plate helps to remove the mud and sand on the energy dissipation slope, prevents the gaps between the pebbles from being blocked, and ensures long-term energy dissipation effect.
[0014] (5) The design of the recoil port and the opening and closing mechanism can regularly clean the sediment at the bottom of the energy dissipation pool to ensure that the function of the energy dissipation pool is not affected, while also reducing the cost of manual maintenance.
[0015] (6) The design of the entire system takes into account the physical characteristics of water flow. Through the rational combination of different structures, the effective dispersion and consumption of water flow energy is achieved, thereby enhancing the durability and reliability of the entire overflow weir system.
[0016] (7) The nylon rubber tube prevents the inner flow channel from being damaged and is easy to replace. During replacement, the flexible structure of the nylon rubber tube can bend as the shape of the inner flow channel changes.
[0017] These improvements work together to not only improve the weir's operating efficiency and safety, but also reduce maintenance costs and extend the service life of the facility. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.
[0019] Figure 1 It is a schematic diagram of the structure of the present invention.
[0020] Figure 2 It is a cross-sectional view of the structure of the present invention. DETAILED DESCRIPTION
[0021] The present invention is further described in detail below by examples, which are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0022] The construction content of a certain dam reinforcement and renovation project in Guangzhou is to reinforce and renovate the Da'ao dam. The dam takes into account irrigation, power generation, and water level regulation. The overflow weir constructed this time is located at the entrance of the left and right main channels, with a total length of 82 meters. After using this construction method, the project quality was improved, the service life of the overflow weir was extended, and good economic and social benefits were brought.
[0023] The present invention proposes a construction method for an energy dissipation and anti-scour overflow weir. Construction process Construction preparation → foundation treatment → cushion construction → steel bar and embedded parts construction → gate hoist installation → weir body concrete pouring → comb plate installation → pebble laying.
[0024] The construction method relates to an energy dissipation and anti-scour overflow weir, comprising a weir body 12, wherein the weir body 12, i.e., the overflow weir body, adopts a reinforced concrete structure; an inner water passing surface 4 is arranged at the upper end of the water-facing side of the top of the weir body 12, and the inner water passing surface 4 is used to extend the flow path and play a role in partial energy dissipation; a concave surface 9 is arranged on the outer side of the inner water passing surface 4, and the concave surface 9 is used to weaken the potential energy of water; an outer water passing surface 5 is arranged on the outer side of the concave surface 9, and the height of the inner water passing surface 4 is higher than that of the outer water passing surface 5, and the outer water passing surface 5 can reduce the potential energy; the height of the outer water passing surface 5 is higher than that of the concave surface 9, and the weir body is provided with an upper portion connected to the concave surface 9 and a lower portion connected to the middle of the weir body 12 The inner flow channel 8 is used to pass part of the water through the inner flow channel 8 to play a certain energy dissipation role; the end of the inner flow channel 8 is an upwardly tilted discharge port 13, and an energy dissipation slope 6 is provided on the lower weir body outside the outer water surface 5. The energy dissipation slope 6 is used to place pebbles, and the slope will not be blocked by sand accumulation; an inner retraction platform 10 is provided at the lower part of the energy dissipation slope 6, and the inner retraction platform 10 is located at the upper part of the energy dissipation pool 16. The inner retraction platform 10 is recessed into the weir body 12, and the inner retraction platform 10 is used to install the mounting frame 11; the cross section of the inner retraction platform 10 is inverted "∟" shape, and the inner retraction platform 10 is fixed by mounting bolts 15 A mounting frame 11 is provided, and the mounting frame 11 is matched and arranged in the inner retracting platform 10, and the mounting bolts 15 are used to fix the mounting frame 11; the mounting frame 11 is used to install the comb plate 7; the comb plate 7 is fixedly installed on the mounting frame 11, and the comb plate 7 is used to prevent pebbles from sliding, and the gap can filter out sand and soil in the water; the upper end of the comb plate 7 is close to the lower end of the energy dissipation slope 6 and is inclined or vertical to the direction of the energy dissipation slope, and an energy dissipation pool 16 is provided at the bottom of the weir body below the energy dissipation slope 6, and the energy dissipation pool 16 is used to weaken the potential energy of water; a pool flow surface 17 is provided on the outside of the energy dissipation pool 16, and the pool flow surface 17 is used to further weaken The potential energy of water, the weir 12 at the bottom of the energy dissipation pool 16 is provided with a recoil port 14, the function of the recoil port 14 is to flush the energy dissipation pool with water flow, so that the sand and soil between the pebbles are washed away; the recoil port 14 is connected to the bottom of the water-facing surface of the weir 12, and the water-facing surface of the weir 12 is provided with a guide groove, and a gate 18 is slidably embedded in the guide groove, and the gate 18 is used to control the flow of the recoil port; the upper end of the gate 18 is connected with an opening and closing screw 2, and the opening and closing screw 2 is used to connect the gate and lift it; the opening and closing screw 2 is slidably installed on the gate frame 3, and the gate frame 3 is used to fix the gate; the gate frame 3 is installed with a gate opening and closing machine 1, and the gate opening and closing machine 1 and the opening and closing screw 2 are engaged. The gate opening and closing machine 1 controls the opening and closing of the recoil port gate; a nylon rubber tube 19 is provided in the inner flow channel 8, and the rubber tube using a nylon rope can be used for a long time and is also convenient for replacement; the nylon rubber tube 19 is a rubber tubular structure with a nylon rope inside along the length of the tube. The pebbles 20 are located in the energy dissipation pool 16, and the function of the pebbles 20 is to prevent the water flow from directly scouring the weir body; During construction, the inner water surface 4, the concave surface 9 and the outer water surface 5 are shaped by a template with the same shape as the inner water surface 4, the concave surface 9 and the outer water surface 5. When pouring the weir body, a plastic pipe or other material pipeline with the same shape as the inner flow channel 8 is pre-buried in the steel bar, and then poured. The two ends of the plastic pipe are sealed. After the pouring is completed, the seal is removed, and the recoil port 14 is also arranged in advance with a plastic pipe. Then, the gate frame 3, the hoist 1 and the gate 18 are installed, and the front mounting frame 11 and the comb plate 7 are installed. After the installation is completed, pebbles are arranged in the energy dissipation slope 6 and the energy dissipation pool 16 to complete the construction.
[0025] During operation, the water first passes over the inner water surface 4, and then enters the concave surface 9. A part of the water flows along the concave surface 9 into the inner flow channel 8, and then is discharged through the discharge port 13. The other part flows downward through the outer water surface to impact the pebbles on the energy dissipation slope 6. Under the action of the pebbles, the energy of the water flow is reduced, so that the impact of the water flow on the energy dissipation slope 6 is reduced to avoid damage to the energy dissipation slope 6. Then the water flows downward from the gap of the comb plate 7. Since the energy dissipation slope 6 is an inclined surface, the sediment in the water flow is discharged downward from the gap of the comb plate 7 along the energy dissipation slope 6. To avoid clogging of the pebbles inside, which causes the internal gaps to disappear and thus reduces the energy dissipation effect, since the mounting frame 11 is installed on the retracted platform, the water flow will not directly act on the mounting frame 11, thereby avoiding damage to the mounting frame 11, and then the water flows down from the energy dissipation slope 6, and the lower water flow collides and impacts with the water flow flowing out from the outlet, thereby consuming the water flow energy and the impact increases the falling surface of the water flow, thereby avoiding concentrated water flow impacting a part of the bottom of the energy dissipation pool 16, reducing the destructive force, and then the falling water flow falls on the pebbles in the energy dissipation pool 16. Under the action of the pebbles, the impact on the bottom of the energy dissipation pool 16 is reduced, and the energy of the water flow is consumed, and then the water flows outward through the pool flow surface 17. After working for a period of time, sediment is deposited in the pebbles. At this time, the opening and closing screw 2 is driven up by the action of the hoist 1, and then the gate 18 is driven up to open the recoil port 14. Under the action of the water pressure in the reservoir on the water-facing surface of the weir body 12, the water flows outward from the recoil port 14, and then impacts the pebbles at the bottom of the energy dissipation pool 16, so that the water flows from bottom to top, and then the sediment in the gaps of the pebbles is flushed out and discharged from the pool flow surface 17. Then the gate 18 is closed after a period of time.
[0026] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicate orientations or positional relationships of devices or equipment during normal use, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention in this regard.
[0027] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.
Claims
1. A method for constructing an energy dissipation and anti-scour overflow weir, characterized in that: The steps include: 1) Construction preparation; 2) Foundation treatment; 3) Construction of cushion layer; 4) Construction of steel bars and embedded parts; 5) Installation of gate hoist; 6) Concrete pouring of dam body; 7) Comb plate installation; 8) Cobblestone laying; During construction, the inner water surface, concave surface and outer water surface are shaped by templates with the same shape as the inner water surface, concave surface and outer water surface. When pouring the weir body, plastic pipes or other material pipes with the same shape as the inner flow channel are pre-buried in the steel bars, and then poured. The two ends of the plastic pipe are sealed. After the pouring is completed, the seals are removed. The recoil port is also arranged in advance with a plastic pipe. Then the gate frame, hoist and gate are installed, as well as the front mounting frame and comb plate. After installation, pebbles are arranged on the energy dissipation slope and in the energy dissipation pool to complete the construction.
2. The energy dissipation and anti-scour overflow weir construction method according to claim 1 is characterized in that: The construction method relates to an energy dissipation and anti-scour overflow weir, comprising a weir body, an inner water passing surface is arranged at the upper end of the water-facing side of the top of the weir body, a concave surface is arranged on the outer side of the inner water passing surface, an outer water passing surface is arranged on the outer side of the concave surface, the inner water passing surface is higher than the outer water passing surface, and the outer water passing surface is higher than the concave surface, an inner flow channel connected to the concave surface at the upper part and connected to the middle part of the weir body at the lower part is arranged in the weir body, the end of the inner flow channel is a discharge port tilted upward, an energy dissipation slope is arranged on the weir body at the lower part of the outer side of the outer water passing surface, an inner retraction platform is arranged at the lower part of the energy dissipation slope, the inner retraction platform is located at the upper part of the energy dissipation pool, the inner retraction platform is recessed into the weir body, and bolts are installed on the inner retraction platform A mounting frame is fixedly installed, and the mounting frame is matched and arranged in the retracted platform. The function of the mounting frame is to install a comb plate; a comb plate is fixedly installed on the mounting frame, and the upper end of the comb plate is close to the lower end of the energy dissipation slope and is an inclined or vertical structure facing the energy dissipation slope. An energy dissipation pool is provided at the bottom of the weir body below the energy dissipation slope, and a pool flow surface is provided on the outside of the energy dissipation pool. A recoil port is opened on the weir body at the bottom of the energy dissipation pool, and the recoil port is connected to the bottom of the water-facing surface of the weir body. A guide groove is provided on the water-facing surface of the weir body, and a gate is slidably embedded in the guide groove. The upper end of the gate is connected to a hoisting screw, and the hoisting screw is slidably installed on the gate frame. A hoisting machine is installed on the gate frame, and the hoisting machine and the hoisting screw are engaged.
3. The energy dissipation and anti-scour overflow weir construction method according to claim 2 is characterized in that: A nylon rubber tube is arranged in the inner flow channel, and the nylon rubber tube is a rubber tubular structure with a nylon rope arranged inside along the length direction of the tube.
4. The energy dissipation and anti-scour overflow weir construction method according to claim 3 is characterized in that: The pebbles are located in the energy dissipation pool.