River channel coastal buffer zone with flood prevention and ecological purification functions

Abstract

The utility model discloses a riverway coastal buffer zone with flood prevention and ecological purification functions, which belongs to the technical field of coastal buffer zones and comprises a quay wall foundation arranged along a riverway coastal slope and a combined ecological frame quay wall fixedly connected onto the quay wall foundation. The combined ecological frame quay wall is formed by stacking multiple layers of ecological frame single bodies in the longitudinal direction, the ecological frame single bodies are connected through fixed connecting pieces in the transverse direction, and an expansion joint is arranged between every two adjacent ecological frame single bodies located on the same horizontal plane. Each ecological frame unit is filled with a filtering filler, and aquatic plants are planted in the ecological frame unit on the top layer. According to the utility model, the flood discharge safety of the river channel in the hilly region can be ensured, and the effects of protecting water quality, intercepting runoff pollutants, controlling river bank erosion and maintaining biological habitat can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of coastal buffer zone, especially to a river coastal buffer zone with flood control and ecological purification. BACKGROUND

[0002] The river and lake coastal buffer zone is a typical water-land interlaced zone, has many ecological functions such as keeping water and soil, stabilizing river bank, controlling non-point source pollution, providing animal habitat etc. In China, due to the outstanding contradiction between man and land and being in the period of rapid economic development, the development intensity and range of river and lake coast by human being are expanding. At the same time, the aggravation of agricultural non-point source pollution and the random discharge of industrial wastewater and domestic sewage also lead to the continuous decline of the health status of river and lake, threatening the integrity and diversity of river and lake ecological system. How to construct the river and lake coastal buffer zone in mountainous area according to local conditions has become a technical problem to be solved in the field. CONTENT OF THE UTILITY MODEL

[0003] The technical problem solved: for the problems in the background art, the utility model provides a river coastal buffer zone with flood control and ecological purification, which can not only ensure the safety of river flood in mountainous area, but also play the role of protecting water quality, intercepting runoff pollutants, controlling river bank erosion and maintaining biological habitat.

[0004] Technical scheme: the utility model discloses a river coastal buffer zone with flood control and ecological purification, which comprises a bank wall foundation arranged along the river bank slope and a combined ecological frame bank wall fixedly connected to the bank wall foundation, the combined ecological frame bank wall is stacked by multiple ecological frame monomers in the longitudinal direction, the ecological frame monomers are connected by fixed connecting pieces in the transverse direction, and a expansion joint is arranged between two adjacent ecological frame monomers in the same horizontal plane; each ecological frame monomer is filled with filter filler, and aquatic plants are planted in the ecological frame monomer at the top layer.

[0005] Preferably, the bank wall foundation is a C25 plain concrete foundation with inverted L-shaped structure, the foundation width is 1.6 m, the wall front foundation thickness is 0.3 m, and the wall lower foundation thickness is 0.3 m.

[0006] Preferably, the combined ecological frame bank wall comprises four layers of ecological frame monomers arranged longitudinally and stacked at a slope ratio of 1:0.5.

[0007] Preferably, the expansion joint has a spacing of 10-15 m and a joint width of 20 mm.

[0008] Preferably, the expansion joint is filled with asphalt reinforcement along the inner wall, the outer wall and the top edge, and the filling depth is not less than 150 mm, and the expansion joint is backfilled with gravel filter pack.

[0009] Preferably, the filter filler is a mixture of pebbles, ceramic granules and volcanic rocks in a ratio of 3:1:1, the filter filler has a particle size of 10-50 mm, and the porosity is not less than 45%.

[0010] Preferably, the aquatic plants are emergent plants, and the aquatic plants are planted according to a ratio of 1:1 of yellow flag and evergreen aquatic iris.

[0011] Preferably, a plurality of step combination surfaces are excavated along the river bank slope and are consistent with the height of the ecological frame monomers, a geogrid is arranged between the bottom of each layer of the ecological frame monomers and the corresponding step combination surface, and the plurality of geogrids arranged from top to bottom are fixed and connected through nails.

[0012] Preferably, the geotextile is arranged immediately adjacent to the ecological frame monomers, and the density of the geotextile is 350 g / m 2 .

[0013] Preferably, a backfill layer is filled between each step combination surface and the ecological frame monomers, the backfill layer is selected according to the soil conditions of the original bank slope and is backfilled in layers by using gravel or 'graded gravel + clay', when the gravel is used for backfilling, the relative density of the gravel is not less than 0.6, and when the 'graded gravel + clay' is used for backfilling, the width of the graded gravel is 200 mm, the graded gravel is wrapped with a layer of 350 g / m 2 of the anti-filtration geotextile, the particle size of the graded gravel is 20-40 mm, and the compaction degree of the clay is not less than 0.91.

[0014] Compared with the prior art, the utility model has the advantages of the following:

[0015] 1. The utility model can not only ensure the flood safety of the river in the hilly area, but also can protect water quality, intercept runoff pollutants, control bank erosion and maintain biological habitats.

[0016] 2. The combined ecological frame bank wall can reduce energy consumption, facilitate operation and management and construction, and is suitable for the actual needs of the river treatment in the hilly area.

[0017] 3. The filter filler can intercept large-particle pollutants and use the biological membrane on the surface of the carrier to adsorb and degrade organic pollutants, so as to purify water.

[0018] 4. The aquatic plants can absorb nutrients such as nitrogen and phosphorus in the water body and improve the landscape effect of the river and the bank environment. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view of the river bank buffer zone structure of the utility model;

[0020] Figure 2 For Figure 1 For the transverse connection structure diagram of the ecological frame monomer.

[0021] Reference signs: 1, combined ecological frame bank wall; 2, filter filler; 3, aquatic plant; 4, bank wall foundation; 5, geogrid; 6, geotextile; 7, backfill layer; 8, step joint surface; 9, fixed connecting piece; 10, expansion joint; 11, river channel riparian slope. DETAILED DESCRIPTION

[0022] To make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the following will combine the attached Figures 1-2 The technical scheme of the embodiments of the utility model is clearly and completely described. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art belong to the scope of protection of the utility model.

[0023] As Figures 1-2 shown, a river channel riparian buffer zone with flood control and ecological purification of the utility model, the river channel riparian buffer zone includes the bank wall foundation 4 set along the river channel riparian slope 11 trend and the combined ecological frame bank wall 1 fixedly connected on the bank wall foundation 4, the combined ecological frame bank wall 1 is by the multiple ecological frame monomer stacking in longitudinal direction, and the ecological frame monomer is connected in transverse direction using fixed connecting piece 9, and expansion joint 10 is arranged between two adjacent ecological frame monomers at the same horizontal plane, each ecological frame monomer is filled with filter filler 2, and aquatic plant 3 is planted in the ecological frame monomer at the top layer. The utility model not only can guarantee the river channel flood safety in hilly area, but also can play the role of protecting water quality, intercepting runoff pollutants, controlling river bank erosion and maintaining biological habitat.

[0024] The bank wall foundation 4 is the C25 plain concrete foundation of inverted L-shaped structure, the foundation width is 1.6m, the wall front foundation thickness is 0.3m, the wall lower foundation thickness is 0.3m, and the bank wall foundation 4 is used to bear the load of the combined ecological frame bank wall 1.

[0025] The combined ecological frame bank wall 1 includes 4 layers of ecological frame monomers arranged longitudinally and stacked at a slope ratio of 1:0.5. In a specific embodiment, the total height of the combined ecological frame bank wall 1 is 2m, the bottom elevation of the ecological frame monomer is consistent with the river bottom elevation, wherein the size of the ecological frame monomer is 2m*1m*0.5m, the strength is C30, and the weight of the ecological frame monomer is 530kg. The combined ecological frame bank wall can reduce energy consumption, facilitate operation and management, and is easy to construct, which is suitable for the actual needs of river channel management in hilly areas.

[0026] The fixed connecting piece 9 is realized by M12 galvanized anti-corrosion bolt assembly to realize the fixed connection of the adjacent two ecological frame monomers. The interval of the expansion joint 10 between the two ecological frame monomers is 10-15 m, the joint width is 20 mm, the caulking material of the expansion joint 10 is bitumen mesh along the inner, outer and top three edges of the wall, the filling depth is not less than 150 mm, the expansion joint 10 is backfilled with gravel filter bag, and the outer layer of the gravel filter bag is wrapped with a layer of 350 g / m 2 The reverse filtration geotextile.

[0027] The filter filler 2 is a mixture of pebbles, ceramsite and volcanic rock in a ratio of 3:1:1, the particle size of the filter filler 2 is 10-50 mm, and the porosity is not less than 45%. The ceramsite and volcanic rock have large specific surface area and are carriers for microbial growth. On the one hand, they can intercept particulate pollutants in runoff, and on the other hand, they can purify organic pollutants in water bodies by using the adsorption and absorption of microorganisms. The pebbles mainly serve as a structural layer to cooperate with other fillers to purify water quality.

[0028] The aquatic plant 3 is a emergent plant, and the aquatic plant 3 is planted according to a ratio of 1:1 of yellow flag and evergreen aquatic iris. The aquatic plant absorbs nitrogen and phosphorus nutrients in water bodies on the one hand, and on the other hand, it can slow down runoff scouring, improve the landscape effect of the river channel, and improve the riparian environment.

[0029] A multi-level step joint surface 8 consistent with the height of the ecological frame monomer is excavated along the river channel riparian slope 11, and a geogrid 5 is arranged between the bottom of each layer of the ecological frame monomer and the corresponding step joint surface 8. The multi-level geogrids 5 arranged from top to bottom are fixed and connected by nails respectively; and the bidirectional tensile strength of the geogrid 5 is 50 KN / m. In a specific embodiment, the length of the first layer of geogrid is 10.23 m, the length of the second layer of geogrid is 9.63 m, the length of the third layer of geogrid is 9.03 m, and the length of the fourth layer of geogrid is 8.43 m.

[0030] The geotextile 6 is arranged immediately adjacent to the layered ecological frame monomer, and the geotextile 6 plays a reverse filtration role; the density of the geotextile 6 is 350 g / m 2 . In a specific embodiment, the length of the first layer of geotextile is 4.3 m, and the length of the second, third and fourth layers of geotextile is 6.2 m.

[0031] A backfill layer 7 is filled between each level of the step joint surface 8 and the ecological frame monomer, and the backfill layer 7 is selected according to the soil conditions of the original bank slope to be backfilled with sand gravel or “graded crushed stone + clay” in layers; when the sand gravel is used for backfilling, the relative density of the sand gravel is not less than 0.6; when the “graded crushed stone + clay” is used for backfilling, the width of the graded crushed stone is 200 mm, the graded crushed stone is wrapped with a layer of 350 g / m 2 of reverse filtration geotextile, the particle size of the graded crushed stone is 20-40 mm, and the compaction degree of the clay is not less than 0.91.

[0032] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the ordinary in the art, without departing from the principles of the present application, under the premise that, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A riverbank buffer zone with both flood control and ecological purification functions, characterized by: The river bank buffer zone includes a bank wall foundation (4) arranged along the river bank slope (11) and a combined ecological frame bank wall (1) fixedly connected to the bank wall foundation (4), wherein the combined ecological frame bank wall (1) is formed by stacking multiple layers of ecological frame monomers in the longitudinal direction, and the ecological frame monomers are connected in the transverse direction by fixed connectors (9), and expansion joints (10) are provided between two adjacent ecological frame monomers on the same horizontal plane; each of the ecological frame monomers is filled with a filter filler (2), and aquatic plants (3) are planted in the ecological frame monomers on the top layer.

2. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1 is characterized in that: The quay wall foundation (4) is a C25 plain concrete foundation of an inverted L-shaped structure, with a foundation width of 1.6m, a foundation thickness in front of the wall of 0.3m, and a foundation thickness under the wall of 0.3m.

3. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1 is characterized in that: The combined ecological frame quay wall (1) comprises four layers of ecological frame units arranged longitudinally and stacked at a slope ratio of 1:0.

5.

4. The riverbank buffer zone with both flood control and ecological purification functions according to claim 3 is characterized in that: The spacing of the expansion joints (10) is 10-15 m, and the width of the joints is 20 mm.

5. The riverbank buffer zone with both flood control and ecological purification functions according to claim 4 is characterized in that: The caulking material of the expansion joint (10) is asphalt hemp tendons, which are filled along the inner, outer and top sides of the wall, with a filling depth of not less than 150 mm. The expansion joint (10) is backfilled with a crushed stone filter bag.

6. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1 is characterized in that: The particle size of the filter filler (2) is 10-50 mm, and the porosity is not less than 45%.

7. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1 is characterized in that: The aquatic plants (3) are emergent plants, and the aquatic plants (3) are planted according to a 1:1 ratio of yellow iris and evergreen aquatic iris.

8. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1 is characterized in that: A multi-level step joint surface (8) having the same height as the ecological frame unit is excavated along the river bank slope (11), and a geogrid (5) is laid between the bottom of each layer of the ecological frame unit and the corresponding step joint surface (8). The multi-level geogrids (5) arranged from top to bottom are fixedly connected by pins; the bidirectional tensile strength of the geogrid (5) is 50KN / m.

9. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1 is characterized in that: A geotextile (6) is laid in layers adjacent to the ecological grid unit, and the density of the geotextile (6) is 350g / m 2 .

10. The riverbank buffer zone with both flood control and ecological purification functions according to claim 1, characterized in that: A backfill layer (7) is filled between each step joint surface (8) and the ecological frame unit. The backfill layer (7) is selected from gravel or "graded crushed stone + clay" layered backfill according to the original slope soil conditions; when gravel is used for backfilling, the relative density of the gravel is not less than 0.6; when "graded crushed stone + clay" is used for backfilling, the width of the graded crushed stone is 200 mm, and the graded crushed stone is covered with a layer of 350 g / m 2 The filter geotextile should be of graded gravel with a particle size of 20~40mm and a clay compaction degree of not less than 0.91.

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