CN114032856B - Construction method of channel and pressure forebay connecting part reinforcing device - Google Patents
Construction method of channel and pressure forebay connecting part reinforcing device Download PDFInfo
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- CN114032856B CN114032856B CN202111566092.6A CN202111566092A CN114032856B CN 114032856 B CN114032856 B CN 114032856B CN 202111566092 A CN202111566092 A CN 202111566092A CN 114032856 B CN114032856 B CN 114032856B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
- E02B8/06—Spillways; Devices for dissipation of energy, e.g. for reducing eddies also for lock or dry-dock gates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/02—Making or lining canals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B5/00—Artificial water canals, e.g. irrigation canals
- E02B5/08—Details, e.g. gates, screens
- E02B5/082—Closures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
- E02B9/06—Pressure galleries or pressure conduits; Galleries specially adapted to house pressure conduits; Means specially adapted for use therewith, e.g. housings, valves, gates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a construction method of a reinforcing device at the joint of a channel and a pressure forebay, which is used at the joint of a diversion channel of a radial hydropower station and the pressure forebay, wherein the reinforcing device comprises a reinforcing step, a stilling ridge, a left reinforcing block and a right reinforcing block.
Description
The technical field is as follows: the invention relates to the field of hydraulic engineering, in particular to a construction method of a reinforcing device at a joint of a channel and a pressure forebay.
Background art: the radial flow type hydropower station is a common hydropower station structure form in China, the inflow cannot be effectively adjusted, and the matching of the generating flow and the inflow of the hydropower station needs to be ensured in the generating operation process. In the radial-flow type hydropower stations, a diversion type hydropower station is the most common, channel diversion is generally built, a water inlet gate at the head of a channel is used for controlling water diversion, a pressure forebay is arranged at the tail end of the channel, and the pressure forebay is connected with a hydroelectric generating set of a power station through a pipeline to realize power generation.
For the mountain area, the terminal velocity of water flow of diversion channel is very fast, especially when the power station begins to draw the water and generate electricity, and channel and pressure forebay junction form the drop easily, this kind of structure causes rivers easily to the damage of channel and pressure forebay junction concrete structure, and for the mountain area structure, channel and pressure forebay all adopt concrete structure, and rivers in case produce the damage to concrete structure, in addition water infiltration, can influence the structure safety in utilization, and current reinforcement mode is mostly to carry out local repair, and it does not change the atress performance and the form of this junction, still can frequently appear destroying after the reinforcement, influences the structure and uses.
In the prior art, there are also step-type energy dissipators, which are mainly applied to the upstream of a spillway or a stilling basin, for example, the step-type energy dissipators are built outside a lateral overflow weir of a pressure forebay, and the main functions of the step-type energy dissipators are to eliminate water flow scouring and reduce the impact of flow on the downstream.
The invention content is as follows: aiming at the problems in the prior art, the invention provides a construction method of a reinforcing device at the joint of a channel and a pressure forebay.
The invention provides a construction method of a channel and pressure forebay junction reinforcing device, wherein the channel and pressure forebay junction reinforcing device is suitable for a radial flow type hydropower station, the radial flow type hydropower station comprises a channel, a pressure forebay, a factory building and a tail water system, the channel is connected with the pressure forebay, a hydroelectric generating set is positioned in the factory building, the pressure forebay is connected with the hydroelectric generating set through a pipeline water diversion system, the hydroelectric generating set is connected with the tail water system, the head end of the channel is provided with a water inlet gate for diverting water to the channel to ensure the water for power generation of the power station, the pressure forebay is provided with a water outlet gate, the elevation of a gate bottom plate of the water outlet gate is equal to the elevation of a bottom plate of the pressure forebay, and the water outlet gate is used for draining the water body of the pressure forebay; the method is characterized in that: the reinforcing device comprises a stilling ridge, a reinforcing step, a left reinforcing block and a right reinforcing block, wherein the stilling ridge is arranged at the tail end of the channel and is a certain distance away from the joint of the channel and the pressure forebay; the reinforcement step is connected with the tail end of the channel, the upper end of the reinforcement step is connected with the tail end of the channel, the lower end of the reinforcement step is connected with the pressure forebay bottom plate, a left reinforcement block is built between the left side wall of the pressure forebay and the reinforcement step, and a right reinforcement block is built between the right side wall of the pressure forebay and the reinforcement step, wherein the construction method comprises the following steps:
s1: the construction is carried out under the working condition that no water is supplied at the upstream of the power station, the channel water inlet gate is closed, and the water body of the pressure forebay is emptied by using the pressure forebay water outlet gate;
s2: cleaning the channel bottom at the tail end of the channel, removing impurities, flushing by using a high-pressure water gun, drilling at the position of the stilling sill at the channel bottom, implanting stilling sill reinforcing steel bars into the drilled holes, wherein the diameter of the drilled holes is larger than that of the stilling sill reinforcing steel bars, and grouting the drilled holes after the stilling sill reinforcing steel bars are implanted;
s3: binding stirrups to the stilling ridge steel bars, arranging a stilling ridge template, pouring concrete, curing to design strength, and removing the template;
s4: a left wedge-shaped energy dissipation block and a right wedge-shaped energy dissipation block are respectively built on the left side and the right side of a channel at the downstream of the stilling threshold, the left wedge-shaped energy dissipation block and the right wedge-shaped energy dissipation block are both away from the stilling threshold by a certain distance, and the distance from the right wedge-shaped energy dissipation block to the stilling threshold is greater than the distance from the left wedge-shaped energy dissipation block to the stilling threshold; the construction method of the left wedge-shaped energy dissipation block and the right wedge-shaped energy dissipation block comprises the following steps: set up left wedge energy dissipation piece reinforcing bar and right wedge energy dissipation piece reinforcing bar respectively in channel correspondence position, left wedge energy dissipation piece reinforcing bar and right wedge energy dissipation piece reinforcing bar set up the mode and do: drilling a corresponding position of the channel bottom, implanting reinforcing steel bars, and grouting; then concrete is poured in the vertical template, and a filter screen is arranged between the left wedge-shaped energy dissipation block reinforcing steel bar and the right wedge-shaped energy dissipation block reinforcing steel bar and is used for filtering sundries flowing from the channel;
s5: cleaning positions, corresponding to a reinforcing step, a left reinforcing block and a right reinforcing block, on a pressure forebay bottom plate, flushing the positions with a high-pressure water gun, drilling holes by using a drilling machine, respectively implanting reinforcing step reinforcing steel bars, left reinforcing block reinforcing steel bars and right reinforcing block reinforcing steel bars, and grouting the drilled holes after implanting the reinforcing step reinforcing steel bars, the left reinforcing block reinforcing steel bars and the right reinforcing block reinforcing steel bars, wherein the reinforcing step reinforcing steel bars are matched with the reinforcing step in shape and are also step-shaped; cleaning the left side wall and the right side wall of the pressure forebay, drilling holes and implanting fixed steel bars, and grouting the drilled holes after the fixed steel bars are implanted;
s6: binding connecting steel bars, and fixedly connecting the left reinforcing block steel bar, the right reinforcing block steel bar, the reinforcing step steel bar, the left side wall fixing steel bar and the right side wall fixing steel bar in sequence by using the connecting steel bars so as to form a steel bar cage structure for reinforcing the step, the left reinforcing block and the right reinforcing block;
s7: and respectively arranging a left reinforcing block, a right reinforcing block and a reinforcing step template, pouring concrete, curing to the designed strength, and then removing the template to complete the construction of the reinforcing device.
Preferably, the distance between the absorption threshold and the connection part of the channel and the pressure forebay is not less than 1m.
Preferably, the reinforcement step is arranged to have an equal width, and the width of the reinforcement step is equal to the width of the bottom of the channel at the connection position of the channel and the pressure forebay.
Preferably, the left reinforcing block and the right reinforcing block are lower than the reinforcing step in height, and the top surfaces of the left reinforcing block and the right reinforcing block are inclined surfaces.
Preferably, the top surfaces of the left reinforcing block and the right reinforcing block are connected with the pressure forebay bottom plate through the arc-shaped surface or the inclined surface.
Preferably, the stilling sill comprises a water-facing surface, a water-backing surface and an arc-shaped top, the water-facing surface and the channel bottom surface are in an obtuse angle, the water-backing surface is in an obtuse angle, and the arc-shaped top is respectively connected with the water-facing surface and the water-backing surface.
The working principle of the invention is as follows:
for a hydropower station in a mountainous area, the gradient of a channel is larger, a pressure forebay is also generally built in the mountainous area, and the joint of the channel and the pressure forebay is easily washed by water flow, and the joint is a weak stressed area; the reinforcing step is matched with the left reinforcing block and the right reinforcing block to realize the energy dissipation of the drop water of the original channel entering the pressure forebay; under general conditions, channel water flow directly enters a pressure forebay, a channel bottom plate is away from a pressure forebay bottom plate by a certain height, and the height can cause energy scouring of water from a channel to cause damage to the pressure forebay bottom plate at a joint and a water scouring part, wherein the damage is particularly serious when the channel just comes water;
after the structure is adopted, the energy of the water coming from the channel is firstly dissipated through the energy dissipation ridge at the tail end of the channel, then the reinforcing step is arranged at the joint of the tail end of the channel and the pressure forebay, and the step energy dissipation is formed by the reinforcing step, so that the water flow scouring is greatly improved, the width of the reinforcing step is as wide as the tail end of the channel, and a left reinforcing block and a right reinforcing block are newly built between the reinforcing step and the left side wall and the right side wall of the pressure forebay, so that the reinforcing step can be effectively supported, the scouring damage on two sides of the reinforcing step can be weakened, and the left reinforcing block and the right reinforcing block can also play a role in dissipating energy;
the left reinforcing block and the right reinforcing block are used for improving the stability of the reinforcing step, and the top surfaces of the left reinforcing block and the right reinforcing block can be used as energy dissipaters, so that the water surface diffusion area is enlarged, and the stability of the bottom of the step can be protected; the connection part of the pressure forebay and the channel belongs to a connection weak area, particularly a mountain area, and only the side wall of the pressure forebay is usually built.
Set up left wedge energy dissipation piece and right wedge energy dissipation piece in the bank low reaches that disappears, wherein left wedge energy dissipation piece and right wedge energy dissipation piece can be used for carrying out the energy dissipation to the rivers behind the bank that disappears to utilize its different left and right sides position, realize the turbulent motion to rivers, because the pressure forebay has powerful steady, the concora crush effect, consequently, this department and the energy dissipation that the reinforcement step caused can not lead to the fact the influence to the power station operation, on the contrary still can reduce the rivers energy, reduce the scour damage to pressure forebay junction and side wall, bottom. The left wedge-shaped energy dissipation block and the right wedge-shaped energy dissipation block are in shapes conforming to the shape of a wedge. The arrangement mode is that energy dissipation is carried out twice after the force dissipation ridge to form turbulent flow, so that the erosion to the two sides of the channel is avoided, the two sides of the channel are protected, and the energy dissipation is realized.
Utilize left wedge energy dissipation piece and right wedge energy dissipation piece to set up the filter screen, thereby realize the filtration to the channel, prevent a large amount of debris entering pressure forebay, influence power generation and clearance, this kind of filter screen combines the energy dissipation, realizes energy dissipation and filterable dual setting, stable in structure, realization energy dissipation and filtering action that can be better to the setting of filter screen, can select great filtration mesh diameter, it can adopt modes such as welded fastening with the fixed of reinforcing bar.
For the pressure forebay, as long-time operation requires dredging operation, the common pressure forebay is inconvenient to enter the bottom of the forebay due to dredging, and the pressure forebay can be conveniently cleaned by operation maintenance personnel by adopting the reinforcing device; the reinforced step, the left reinforced block and the right reinforced block enhance the concrete volume at the joint of the channel and the pressure forebay, so that the stability of the pressure forebay can be ensured, and the scouring damage and the water seepage damage of the structure at the joint can be avoided.
The construction method is based on the structure provided by the invention, and the integral performance of structural connection is realized through cast-in-place concrete, so that better integral performance is ensured when the reinforcement system is stressed at a later stage, and the reinforcement system is prevented from being locally dislocated and damaged.
The invention has the advantages that:
the invention provides a construction method of a reinforcing device at the joint of a channel and a pressure forebay, which is used for effectively improving the stress performance of the joint of the channel and the pressure forebay at the joint of a diversion channel of a radial hydropower station and the pressure forebay, wherein the reinforcing device comprises a reinforcing step, a stilling ridge, a left reinforcing block and a right reinforcing block.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic plan view of the present invention;
FIG. 3 is a schematic structural view of a reinforcing step and a right reinforcing block;
figure 4 is a schematic structural view of a left wedge-shaped energy dissipation block and a right wedge-shaped energy dissipation block.
The specific implementation mode is as follows: the structure defined in the present invention will be explained in detail with reference to the drawings attached to the specification.
The invention provides a construction method of a reinforcing device at the joint of a channel 1 and a pressure forebay, wherein the reinforcing device at the joint of the channel 1 and the pressure forebay is suitable for a radial flow type hydropower station, the radial flow type hydropower station comprises a channel 1, a pressure forebay, a factory building and a tail water system, the channel 1 is connected with the pressure forebay, a water-turbine generator set is positioned in the factory building, the pressure forebay is connected with the water-turbine generator set through a pipeline water diversion system, the water-turbine generator set is connected with the tail water system, the head end of the channel 1 is provided with a water inlet gate for guiding water to the channel 1 to ensure the water for power generation of a power station, the pressure forebay is provided with a water outlet gate, the gate bottom plate elevation of the water outlet gate is equal to the bottom plate elevation of the pressure forebay, and the water outlet gate is used for draining the water body of the pressure forebay; the method is characterized in that: the reinforcing device comprises a stilling threshold 2, a reinforcing step 3, a left reinforcing block 44 and a right reinforcing block 5, wherein the stilling threshold 2 is arranged at the tail end of the channel 1, and the stilling threshold 2 is a certain distance away from the joint of the channel 1 and the pressure forebay; the reinforcement step 3 is connected with the tail end of the channel 1, the upper end of the reinforcement step 3 is connected with the tail end of the channel 1, the lower end of the reinforcement step 3 is connected with the pressure forebay bottom plate, a left reinforcement block 44 is built between the pressure forebay left side wall 6 and the reinforcement step 3, and a right reinforcement block 5 is built between the pressure forebay right side wall 7 and the reinforcement step 3, wherein the construction method comprises the following steps:
s1: the construction is carried out under the working condition that no water is supplied at the upstream of the power station, the water inlet gate of the channel 1 is closed, and the water body of the pressure forebay is emptied by using the pressure forebay water outlet gate;
s2: cleaning the channel bottom at the tail end of the channel 1, removing impurities, flushing by using a high-pressure water gun, drilling at the position of the stilling sill 2 at the channel bottom, implanting a stilling sill 2 steel bar into the drilling hole, wherein the diameter of the drilling hole is larger than that of the stilling sill 2 steel bar, and grouting the drilling hole after the stilling sill 2 steel bar is implanted;
s3: binding stirrups to the reinforcement bars of the stilling ridges 2, arranging templates of the stilling ridges 2, pouring concrete, curing to designed strength, and removing the templates;
s4: a left wedge-shaped energy dissipation block 21 and a right wedge-shaped energy dissipation block 22 are respectively built on the left side and the right side of the channel 1 at the downstream of the stilling threshold 2, the left wedge-shaped energy dissipation block 21 and the right wedge-shaped energy dissipation block 22 are both away from the stilling threshold 2 by a certain distance, and the distance from the right wedge-shaped energy dissipation block 22 to the stilling threshold 2 is greater than the distance from the left wedge-shaped energy dissipation block 21 to the stilling threshold 2; the construction method of the left wedge-shaped energy dissipation block 21 and the right wedge-shaped energy dissipation block 22 comprises the following steps: set up left wedge energy dissipation piece 21 reinforcing bar and right wedge energy dissipation piece 22 reinforcing bar respectively in channel corresponding position, left wedge energy dissipation piece 21 reinforcing bar and right wedge energy dissipation piece 22 reinforcing bar set up the mode and do: drilling a corresponding position of the channel bottom, implanting reinforcing steel bars, and grouting; then concrete is poured in the vertical template, and a filter screen 23 is arranged between the reinforcing steel bars of the left wedge-shaped energy dissipation block 21 and the reinforcing steel bars of the right wedge-shaped energy dissipation block 22 and is used for filtering sundries flowing from the channel;
s5: cleaning positions, corresponding to a reinforcing step 3, a left reinforcing block 4 and a right reinforcing block 5, on a pressure forebay bottom plate, flushing the pressure forebay bottom plate by using a high-pressure water gun, drilling holes by using a drilling machine, implanting reinforcing step 3 reinforcing steel bars, left reinforcing block 4 reinforcing steel bars and right reinforcing block 5 reinforcing steel bars respectively, grouting the drilled holes after implanting the reinforcing step 3 reinforcing steel bars, left reinforcing block 4 reinforcing steel bars and right reinforcing block 5 reinforcing steel bars, wherein the reinforcing step 3 reinforcing steel bars are matched with the reinforcing step 3 in shape and are also step-shaped; cleaning a left side wall 6 and a right side wall 7 of the pressure forebay, drilling holes and implanting fixed steel bars, and grouting the drilled holes after the fixed steel bars are implanted;
s6: binding connecting steel bars, and fixedly connecting the left reinforcing block 4 steel bars, the right reinforcing block 5 steel bars, the reinforcing step 3 steel bars, the left side wall 6 fixed steel bars and the right side wall 7 fixed steel bars in sequence by using the connecting steel bars to form a steel bar cage structure for reinforcing the step 3, the left reinforcing block 4 and the right reinforcing block 5;
s7: and respectively arranging a left reinforcing block 4, a right reinforcing block 5 and a reinforcing step 3 template, pouring concrete, curing to the designed strength, and then removing the templates to complete the construction of the reinforcing device.
Preferably, the distance between the absorption sill 2 and the connection part of the channel 1 and the pressure forebay is not less than 1m; the absorption sill 2 can absorb the water flow energy, so that the water flow energy is effectively reduced, and the water flow entering the pressure forebay is slowed down;
preferably, the reinforcing step 3 is arranged in an equal width mode, and the width of the reinforcing step is equal to the bottom width of the channel 1 at the connecting position of the channel 1 and the pressure forebay; the reinforcing step 3 can be set with equal width or unequal width, and because the reinforcing step 3 is in a gravity stable form, when the reinforcing step 3 is set with unequal width, the bottom of the reinforcing step 3 is ensured to be larger than the top; one side of the reinforcing step 3 is connected with the joint of the left side wall 6 and the right side wall 7 of the pressure forebay, and the side of the reinforcing step 3 is respectively connected with the left reinforcing block 4 and the right reinforcing block 5;
preferably, the heights of the left reinforcing block 4 and the right reinforcing block 5 are lower than the height of the reinforcing step 3, and the top surfaces of the left reinforcing block 4 and the right reinforcing block 5 are inclined planes; the left reinforcing block 4 and the right reinforcing block 5 are used for fixing the reinforcing step 3, forming water fall and consuming water flow energy, and the heights of the left reinforcing block 4 and the right reinforcing block 5 are more suitable between 1/2 and 2/3 of the height of the reinforcing step 3;
preferably, the top surfaces of the left reinforcing block 4 and the right reinforcing block 5 are connected with the pressure forebay bottom plate through the arc-shaped surface or the inclined surface; the arc-shaped surface and the inclined surface can be used for avoiding damage caused by local scouring, and when construction conditions are limited, the inclined surface arrangement can be considered, namely, the construction of a plane template is carried out;
preferably, the absorption sill 2 comprises a water-facing surface, a water-back surface and an arc-shaped top, the angle between the water-facing surface and the bottom surface of the channel 1 is an obtuse angle, the angle between the water-back surface and the bottom surface of the channel 1 is an obtuse angle, and the arc-shaped top is respectively connected with the water-facing surface and the water-back surface; the absorption sill 2 can also be covered with a layer of rubber material to prevent the water flow from scouring the surface of the concrete.
The above-described embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be construed as being limited to the specific forms set forth in the examples, but also includes equivalent technical means which can be conceived by those skilled in the art from the present inventive concept.
Claims (6)
1. A construction method of a reinforcing device for a joint of a channel and a pressure forebay is suitable for a radial flow type hydropower station, the radial flow type hydropower station comprises the channel, the pressure forebay, a factory building and a tail water system, the channel is connected with the pressure forebay, a water turbine generator set is located in the factory building, the pressure forebay is connected with the water turbine generator set through a pipeline water diversion system, the water turbine generator set is connected with the tail water system, a water inlet gate is arranged at the head end of the channel and used for diverting water to the channel to ensure the power generation water of the power station, a water outlet gate is arranged on the pressure forebay, the gate bottom plate elevation of the water outlet gate is equal to the bottom plate elevation of the pressure forebay, and the water outlet gate is used for emptying the water body of the pressure forebay; the method is characterized in that: the reinforcing device comprises a stilling ridge, a reinforcing step, a left reinforcing block and a right reinforcing block, wherein the stilling ridge is arranged at the tail end of the channel and is a certain distance away from the joint of the channel and the pressure forebay; the reinforcement step is connected with the tail end of the channel, the upper end of the reinforcement step is connected with the tail end of the channel, the lower end of the reinforcement step is connected with the pressure forebay bottom plate, a left reinforcement block is built between the left side wall of the pressure forebay and the reinforcement step, and a right reinforcement block is built between the right side wall of the pressure forebay and the reinforcement step, wherein the construction method comprises the following steps:
s1: the construction is carried out under the working condition that no water is supplied at the upstream of the power station, the channel water inlet gate is closed, and the water body of the pressure forebay is emptied by using the pressure forebay water outlet gate;
s2: cleaning the channel bottom at the tail end of the channel, removing impurities, flushing by using a high-pressure water gun, drilling at the position of the stilling sill at the channel bottom, implanting stilling sill reinforcing steel bars into the drilled holes, wherein the diameter of the drilled holes is larger than that of the stilling sill reinforcing steel bars, and grouting the drilled holes after the stilling sill reinforcing steel bars are implanted;
s3: binding stirrups to the reinforcement bars of the stilling ridges, arranging a stilling ridge template, pouring concrete, curing to the designed strength, and removing the template;
s4: a left wedge-shaped energy dissipation block and a right wedge-shaped energy dissipation block are respectively built on the left side and the right side of a channel at the downstream of the stilling threshold, the left wedge-shaped energy dissipation block and the right wedge-shaped energy dissipation block are both away from the stilling threshold by a certain distance, and the distance from the right wedge-shaped energy dissipation block to the stilling threshold is greater than the distance from the left wedge-shaped energy dissipation block to the stilling threshold; the construction method of the left wedge-shaped energy dissipation block and the right wedge-shaped energy dissipation block comprises the following steps:
set up left wedge energy dissipation piece reinforcing bar and right wedge energy dissipation piece reinforcing bar respectively in channel correspondence position, left wedge energy dissipation piece reinforcing bar and right wedge energy dissipation piece reinforcing bar set up the mode and do: drilling a corresponding position of the channel bottom, implanting reinforcing steel bars, and grouting; then concrete is poured in the vertical template, and a filter screen is arranged between the left wedge-shaped energy dissipation block reinforcing steel bar and the right wedge-shaped energy dissipation block reinforcing steel bar and is used for filtering sundries flowing from the channel;
s5: cleaning positions, corresponding to a reinforcing step, a left reinforcing block and a right reinforcing block, on a pressure forebay bottom plate, flushing the positions with a high-pressure water gun, drilling holes by using a drilling machine, respectively implanting reinforcing step reinforcing steel bars, left reinforcing block reinforcing steel bars and right reinforcing block reinforcing steel bars, and grouting the drilled holes after implanting the reinforcing step reinforcing steel bars, the left reinforcing block reinforcing steel bars and the right reinforcing block reinforcing steel bars, wherein the reinforcing step reinforcing steel bars are matched with the reinforcing step in shape and are also step-shaped; cleaning the left side wall and the right side wall of the pressure forebay, drilling holes and implanting fixed steel bars, and grouting the drilled holes after the fixed steel bars are implanted;
s6: binding connecting steel bars, and fixedly connecting the left reinforcing block steel bar, the right reinforcing block steel bar, the reinforcing step steel bar, the left side wall fixing steel bar and the right side wall fixing steel bar in sequence by using the connecting steel bars so as to form a steel bar cage structure for reinforcing the step, the left reinforcing block and the right reinforcing block;
s7: and respectively arranging a left reinforcing block, a right reinforcing block and a reinforcing step template, pouring concrete, curing to the designed strength, and then removing the template to complete the construction of the reinforcing device.
2. The method of claim 1 for constructing a reinforcement at the junction of a channel and a pressure forebay, wherein the method comprises the steps of: the distance between the absorption threshold and the connection position of the channel and the pressure forebay is not less than 1m.
3. The method of claim 1 for constructing a reinforcement at the junction of a canal and a pressure forebay, wherein: the reinforcing steps are arranged in an equal-width mode, and the width of each reinforcing step is equal to the bottom width of the channel at the connecting position of the channel and the pressure forebay.
4. The method of claim 3, wherein the reinforcement is applied to the junction between the canal and the pressure forebay, and further comprises: the left reinforcing block and the right reinforcing block are both lower than the height of the reinforcing step, and the top surfaces of the left reinforcing block and the right reinforcing block are inclined planes.
5. The method of claim 1 for constructing a reinforcement at the junction of a canal and a pressure forebay, wherein: the top surfaces of the left reinforcing block and the right reinforcing block are connected with the pressure forebay bottom plate through arc surfaces or inclined surfaces.
6. The method of claim 1 for constructing a reinforcement at the junction of a channel and a pressure forebay, wherein the method comprises the steps of: the stilling sill comprises a water-facing surface, a water-backing surface and an arc-shaped top, the water-facing surface and the angle of the channel bottom surface are obtuse angles, the water-backing surface and the angle of the channel bottom surface are obtuse angles, and the arc-shaped top is connected with the water-facing surface and the water-backing surface respectively.
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| US6568878B2 (en) * | 2001-10-15 | 2003-05-27 | The United States Of America As Represented By The Secretary Of The Navy | Wave energy dissipater and beach renourishing system |
| CN205421153U (en) * | 2016-03-22 | 2016-08-03 | 黄河勘测规划设计有限公司 | Arrangement structure on channel earial drainage weir |
| CN105926550B (en) * | 2016-04-28 | 2017-08-15 | 河海大学 | The dispatching method for avoiding the hydropower station pressure forebay of the open diversion canal containing overlength hollow |
| CN207582440U (en) * | 2017-11-27 | 2018-07-06 | 中国华电科工集团有限公司 | A kind of preposition power station of forebay trash rack |
| CN108221843A (en) * | 2018-03-16 | 2018-06-29 | 卿何琳 | A kind of discharge structure structure of water conservancy |
| CN108411859A (en) * | 2018-03-17 | 2018-08-17 | 河南水利与环境职业学院 | A kind of overflow weir structure construction method for mountain area hydropower station pressure forebay |
| CN113265991B (en) * | 2021-06-22 | 2022-04-19 | 中国电建集团贵阳勘测设计研究院有限公司 | Method for rebuilding multiple diversion tunnels into rotational flow vertical shaft flood discharge system |
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