CN214496049U - Ecological infiltration weir of quality of water purification and flood discharge drainage coupling - Google Patents
Ecological infiltration weir of quality of water purification and flood discharge drainage coupling Download PDFInfo
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- CN214496049U CN214496049U CN202023072963.2U CN202023072963U CN214496049U CN 214496049 U CN214496049 U CN 214496049U CN 202023072963 U CN202023072963 U CN 202023072963U CN 214496049 U CN214496049 U CN 214496049U
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Abstract
A quality of water purifies and ecological infiltration weir of flood discharge drainage coupling, belong to environmental engineering, ecological engineering and hydraulic engineering design field. The ecological percolation weir consists of a settling zone, an ecological percolation weir and a post-positioned scour prevention zone; a sedimentation area is established in the upstream area of the ecological percolation weir, and an anti-impact area is established in the downstream area of the ecological percolation weir; the bottom of the settlement zone is subjected to hardening treatment, the side slope adopts hardened slope protection, and the gradient ratio is less than or equal to 1: 2. The ecological percolation weir of the utility model is provided with a preposed settling area, thus reducing the blocking risk of the percolation weir; meanwhile, different water passing amounts are ensured by setting different particle sizes on the height, so that the barrier to flood is reduced, the river can cross over when the river exceeds the flood discharge range, and the flood discharge requirement of a river channel is ensured; meanwhile, the filter device has a certain purification effect on pollutants such as SS, COD, ammonia nitrogen, total phosphorus and the like in river water through the filtration of the gravels and the action of a biological membrane among the gravels, and has simple structure and low manufacturing cost.
Description
Technical Field
A quality of water purifies and ecological infiltration weir of flood discharge drainage coupling, belong to environmental engineering, ecological engineering and hydraulic engineering design field.
Background
In recent years, along with the development of urban scale, urban river channels are polluted by pollution sources for a long time, so that the quality of water bodies is reduced, and along with the aggravation of pollution, the self-cleaning function of the water bodies is lost, and the urban river channels are black and smelly. The deterioration of the water environment is not matched with the urban overall environment. The method has the advantages of improving the water quality of the river channel, recovering the clear and beautiful water of the river channel and constructing healthy water ecology, and is an urgent need for the construction of urban environment.
At present, the most main problems in ecological restoration of riverways at home and abroad are uneven water distribution of the riverways, short hydraulic retention time and lack of self-purification capability of the riverways. Except in rainy season, river water mostly flows away in a channel form, and is particularly serious in northern arid areas.
In the river ecological restoration process, a certain water level of the river needs to be ensured to maintain the minimum ecological water demand of the target river reach and ensure the normal operation of the river water ecological system. In order to solve the problem of water storage capacity of a river channel, a water storage facility is constructed in the current main mode.
CN 103306241 a discloses a water storage system of river rubber dam;
CN 204112283U discloses a rolling dam suitable for landscape rivers;
CN 204753516U discloses a percolation weir for classifying the particle size of weir gravel.
The technical solutions disclosed in the above documents are all the construction methods of various water storage facilities. The water storage facilities are divided into watercourse barrages with water permeability and impermeability. The watertight dam mainly comprises a rolling dam, a rubber dam and the like, and due to the fact that upstream and downstream river channel ecological systems are separated, the structure is complex, the permeability is poor, a dead water area is easily formed in the front portion, water quality is deteriorated, meanwhile, the dam has large influence on flood discharge, and the dam is small in application in urban river channels. The permeable barrages mainly comprise various percolation barrages, and the common percolation barrages are easy to block and have larger barrier to flood when flood discharge is carried out.
SUMMERY OF THE UTILITY MODEL
The utility model provides a block risk of the percolation weir is reduced to solve the problems; simultaneously through setting up different particle diameters in the height, guarantee different water yields, reduce the quality of water purification and the ecological infiltration weir of flood discharge drainage coupling to the hindrance of flood.
The utility model adopts the following technical scheme:
the ecological infiltration weir of the coupling of water quality purification and flood discharge and drainage of the utility model consists of a settling area, an ecological infiltration weir and a post-positioned scour prevention area; a sedimentation area is established in the upstream area of the ecological percolation weir, and an anti-impact area is established in the downstream area of the ecological percolation weir; the bottom of the settlement zone is subjected to hardening treatment, the side slope adopts hardened slope protection, and the gradient ratio is less than or equal to 1: 2.
Quality of water purify and flood discharge drainage coupling's ecological infiltration weir, ecological infiltration weir become the multistage formula and arrange in the river course.
The ecological infiltration weir of the coupling of water quality purification and flood discharge and drainage of the utility model is composed of fixed wooden piles and gravel gabions; the fixed wooden piles are arranged at the bottom of the river channel and are enclosed outside the gravel stone cage to form a filter weir structure; the gravel gabion is composed of a plurality of gabions, and the plurality of gabions are sequentially stacked to form a stepped structure.
The ecological infiltration weir for coupling water quality purification and flood discharge and drainage of the utility model is characterized in that each stone cage of the gravel stone cages is provided with meshes, and gravels with different grain diameters are filled in the stone cages; the particle size of the gravels in the gabions which are sequentially stacked to form the stepped structure is gradually increased from the bottom layer to the top layer; the mesh aperture of each layer of gabion is smaller than the minimum particle size of the gravel packed in the layer.
The water quality purification and flood discharge and drainage coupled ecological infiltration weir has the length of the laying water flow direction of the rear scour prevention area of 2-3 m.
Quality of water purification and flood discharge drainage coupled ecological infiltration weir, ecological infiltration weir bottom lay the bed course, the top face and the river bottom line of bed course flush, the bed course constitute by metalling or plain concrete bed course, the thickness of bed course be 100 and give good care for 200 mm.
Advantageous effects
The ecological infiltration weir provided by the utility model has the advantages that the ecological infiltration weir for water purification and flood discharge and drainage coupling is provided with a preposed settling area, so that the blocking risk of the infiltration weir is reduced; meanwhile, different water passing amounts are ensured by setting different particle sizes on the height, so that the barrier to flood is reduced, the river can cross over when the river exceeds the flood discharge range, and the flood discharge requirement of a river channel is ensured; meanwhile, the filter device has a certain purification effect on pollutants such as SS, COD, ammonia nitrogen, total phosphorus and the like in river water through the filtration of the gravels and the action of a biological membrane among the gravels, and has simple structure and low manufacturing cost.
The utility model provides a quality of water purifies and flood discharge drainage coupling's ecological infiltration weir sets up leading settlement zone, and the river water storage before the infiltration weir is increased can carry out settlement in advance to the river and handle, slows down the time that ecological infiltration weir blockked up, and the operation maintenance cost is introduced to the at utmost.
The utility model provides a water purification and flood discharge and drainage coupling's ecological infiltration weir, the major structure divides the three-layer setting from the top down, and the gravel through different particle diameters can deal with the influence of different water yields to the infiltration weir: and in normal water level and low water level, the river water in the riverway is less, and the ecological percolation weir is used for purifying the water. River water passes through the lowermost gabion, and gravel with small particle size can slow down the time for the river water to pass through, so that the aim of storing the water is effectively fulfilled; meanwhile, the gravel with small particle size has small pore size, can more effectively filter SS in river water, can play a certain role in filtering algae in the river, purify water quality and reduce blue algae outbreak; meanwhile, the gravel with small particle size has large specific surface area, so that a microbial film is more easily formed, attachment of microorganisms is facilitated, removal of pollutants such as COD (chemical oxygen demand), ammonia nitrogen, total phosphorus and the like in river water by the microorganisms is enhanced, and water levels in a dry period and a flat period can be effectively improved.
In light rain, the river water flow is slightly increased, the river water level is slightly increased, the ecological percolation weir mainly plays a role in purification, and the ecological percolation weir assists in flood discharge. The water can be passed through a gravel gabion with the particle size of 20-30mm arranged in the middle layer, and the water passing capacity is increased along with the increase of the particle size of the gravel; meanwhile, most river water still passes through the bottommost layer, and most purification effects are guaranteed.
During medium rain, river water flow continues to increase, the requirement on the water passing capacity of the river is improved, the ecological percolation weir mainly acts on flood passing, and purification is assisted. The water passing capability can be greatly increased by filling gravel gabions with the grain sizes of 40-60mm in the upper layer for water passing, and a certain purification effect is ensured.
In heavy rain, the river flow is very large, and flood can cross over the percolation weir, so that the flood running function of the river channel is ensured.
The utility model discloses set up the rearmounted scour protection district, flood overflow when can reducing the heavy rain flows the impact to riverbed behind the weir, increases the stability of ecological infiltration weir, increases the live time.
Drawings
FIG. 1 is a plan view of an ecological infiltration weir of the present invention for water purification and flood discharge and drainage;
FIG. 2 is a sectional view of the ecological infiltration weir 1-1 of the present invention for water purification and flood discharge and drainage;
fig. 3 is a structural diagram of the gravel gabion of the present invention.
The reference numbers in the figures illustrate:
1. settling zone, 2, ecological infiltration weir, 3, scour prevention zone, 4, settling zone stereoplasm protects the end, 5, top layer gravel gabion, 6, middle level gravel gabion, 7, lower floor gravel gabion, 8, fixed stake, 9, zinc-plated gabion screen frame, 10, gravel.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the following description will clearly and completely describe the technical solution of the embodiments of the present invention by combining the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
As shown in fig. 1: an ecological infiltration weir for coupling water quality purification and flood discharge and drainage, which consists of a settling zone 1, an ecological infiltration weir 2 and an anti-scour zone 3; a settling zone 1 is established in the upstream area of the ecological percolation weir, the settling zone is a preposed settling zone, and an anti-impact zone 3 is established in the downstream area of the ecological percolation weir 2; the bottom of the settling zone 1 is subjected to hardening treatment, a steel-concrete or brick-concrete structure can be selected, the slope adopts hardened slope protection, and the gradient ratio is less than or equal to 1: 2. The ecological percolation weir is arranged in the river channel in a multi-section way.
As shown in fig. 2: the ecological infiltration weir is used for coupling water quality purification with flood discharge and drainage, and consists of a fixed timber pile 8 and a gravel stone cage; the fixed wooden piles 8 are arranged at the bottom of the river channel, and the fixed wooden piles 8 surround the gravel gabion to form a filter weir structure; the gravel gabion is composed of a plurality of gabions, and the plurality of gabions are sequentially stacked to form a stepped structure. Each of the gravel gabions is provided with meshes, and gravels 10 with different grain diameters are filled in the gabions; the particle sizes of gravels in the gabions which are sequentially stacked to form a stepped structure are gradually increased from the bottom layer to the top layer; the mesh aperture of each layer of gabion is smaller than the minimum particle size of the gravel packed in the layer. The bottom of the ecological infiltration weir is paved with a cushion layer, the top end surface of the cushion layer is flush with a river bottom line, the cushion layer consists of a rubble layer or a plain concrete cushion layer, and the thickness of the cushion layer is 100-200 mm.
A design method of an ecological percolation weir for coupling water quality purification and flood discharge and drainage comprises the following steps:
the method comprises the following steps: calculating the size of the settling zone 1 in the river channel according to the river flow rate and the SS concentration in the actual river channel; calculating by the total effective volume of the settling zone:
v-total effective volume of the settling zone, m 3; qmax-river flow in mid-rain, m 3/s; t is the retention time of the settling zone in the middle rain, min is generally 30-120 min.
And combining the obtained total effective volume of the settling zone with the width of the settling zone to form the width B of the river channel, wherein the effective water depth H of the settling zone can be 2-4 m.
Calculating the length L of the settling zone to obtain the concentration of SS in the river channel:
v-total effective volume of the settling zone, m 3;
b-river width, m;
h, the effective water depth of a settling zone in medium rain, m, is generally 2-4 m.
Determining the conventional water level, the light rain water level, the medium rain water level and the heavy rain water level in the river channel;
and (3) conventional water level: the conventional water level is the normal water level of the riverway and is determined according to the average water level of the riverway in the flat water stage in nearly 10 years;
rain water level: determining the river channel water level when the rainfall is 4mm according to river channel hydrological data in nearly 10 years;
the moderate rain water level: determining the river water level when the rainfall is 6mm according to river hydrological data in nearly 10 years;
heavy rain water level: a precipitation level greater than 6 mm.
Thirdly, determining the distance and the length of the fixed wooden piles in the ecological percolation weir through the flow velocity of the river channel in the flood period and the design of the field geological condition; the distance and the length of the wooden piles are determined according to the impact force of flood on the percolation weir and the bearing capacity of the field bottom layer, structural stability calculation is needed, and the stability of the percolation weir is ensured and is not destroyed by flood.
A construction method of an ecological percolation weir for coupling water purification and flood discharge and drainage comprises the following steps:
digging a settling area in a river channel, hardening the bottom of the settling area through a reinforced concrete or brick-concrete structure, wherein a slope adopts hardened slope protection, and the gradient ratio is confirmed to be less than or equal to 1: 2;
paving a broken stone cushion layer or a plain concrete cushion layer which is level to a river bottom line at the downstream river bottom of the side slope, and confirming that the thickness of the cushion layer is 100mm-200 mm;
step three, establishing two rows of fixed wood piles on the cushion layer in the step two according to the confirmed fixed wood pile spacing and length; placing a bottom-layer gabion between the two rows of fixed wooden piles, and filling gravels with the grain sizes of 8-15mm into the bottom-layer gabion;
preventing a middle-layer gabion on the bottom-layer gabion, and filling gravels with the grain diameter of 20-30mm in the middle-layer gabion;
the top layer gabion is prevented on the middle layer gabion, and gravels with the grain diameter of 40-60mm are filled in the top layer gabion;
the bottom layer gabion, the middle layer gabion and the top layer gabion are bound and fixed through galvanized iron wires to form a percolation weir;
fourthly, laying an erosion prevention area at the downstream of the percolation weir, wherein the bottom of the erosion prevention area is a riprap bottom protector with the length of 2-3 m; completing the ecological percolation weir;
and step five, constructing the ecological percolation weir again in the river channel through the step one to the step four to form a multi-section percolation weir according to the requirement.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a quality of water purifies and ecological infiltration weir of flood discharge drainage coupling which characterized in that: the ecological percolation weir consists of a settling zone, an ecological percolation weir and a post-positioned scour prevention zone; a sedimentation area is established in the upstream area of the ecological percolation weir, and an anti-impact area is established in the downstream area of the ecological percolation weir; the bottom of the settlement zone is subjected to hardening treatment, the side slope adopts hardened slope protection, and the gradient ratio is less than or equal to 1: 2.
2. The ecological percolation weir of coupling water quality purification and flood discharge and drainage of claim 1, wherein: the ecological percolation weir is arranged in a river channel in a multi-section mode.
3. The ecological percolation weir of coupling water quality purification and flood discharge and drainage of claim 1, wherein: the ecological percolation weir consists of a fixed wooden pile and a gravel gabion; the fixed wooden piles are arranged at the bottom of the river channel and are enclosed outside the gravel stone cage to form a filter weir structure; the gravel gabion is composed of a plurality of gabions, and the plurality of gabions are sequentially stacked to form a stepped structure.
4. The ecological percolation weir of coupling water quality purification and flood discharge and drainage of claim 3, characterized in that: each of the gravel gabions is provided with meshes, and gravels with different particle sizes are filled in the gabions; the particle size of the gravels in the gabions which are sequentially stacked to form the stepped structure is gradually increased from the bottom layer to the top layer; the mesh aperture of each layer of gabion is smaller than the minimum particle size of the gravel packed in the layer.
5. The ecological percolation weir of coupling water quality purification and flood discharge and drainage of claim 1, wherein: the length of the laying of the rear scour prevention area along the water flow direction is 2-3 m.
6. The ecological percolation weir of coupling water quality purification and flood discharge and drainage of claim 1, wherein: the bottom of the ecological infiltration weir is paved with a cushion layer, the top end surface of the cushion layer is flush with a river bottom line, the cushion layer consists of a rubble layer or a plain concrete cushion layer, and the thickness of the cushion layer is 100-200 mm.
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