CN102071697B - Ecological Restoration Method of Hard Reinforced Concrete Revetment Slope - Google Patents

Abstract

The invention discloses a hard reinforced concrete revetment slope biological repairing method, which is characterized by comprising the steps of: roughing a concrete revetment and constructing drainage ditches at set intervals; digging a water collecting tank on one side of the cross of the revetment and a road, reserving an opening at the joint of the drainage ditch and the water collecting tank, and constructing a watertight concrete overflow bank; filling gravels in the water collecting tank and the drainage ditches; and welding earthwork grids by high-density polyethylene stripes on the protection slope, laying gravel cushion coats in the earthwork grids, and finally pouring biological slurry. The method has the advantages that: the whole project is stable and safe; rain flows into the water collecting tank and passes through grave areas, non-watertight sand-free concrete, a slope cushion coat, plant roots and the like to seep into rivers, so water quality is improved to a relatively large extent; when rainfall runoff is overlarge, the rain overflows from the overflow bank and passes through the graves of the drainage ditches, so the water quality is also purified to a certain extent, meanwhile the slope is protected; the biological slurry poured onto the slope is prepared from biological materials, and has certain anti-erosion strength and can be used as a substrate for plant growth, so the cost is low and the operation is simple.

Description

Ecological Restoration Method of Hard Reinforced Concrete Revetment Slope

technical field

The invention relates to an ecological restoration method for concrete revetment slopes, belonging to the fields of river ecological revetment and river water quality purification.

Background technique

In traditional river improvement projects, rigid materials such as mortar or dry block stones, cast-in-place or prefabricated concrete are often used for slope protection. This type of slope protection can well protect the river slope and realize the flood discharge, drainage and water and soil protection of the river. It has the advantages of good stability, land saving, and high degree of construction mechanization. However, with the development of social economy, people's ecological concept is getting stronger and stronger, and they gradually realize that this type of slope protection will have a negative impact on the ecosystem, and the hard slope accelerates the runoff of rainwater and the direct flow of pollutants into the river. . In order to maintain the natural characteristics of the river as much as possible and restore the river ecosystem, engineers and technicians at home and abroad have developed a variety of ecological revetment technologies, and proposed some ecological revetment structures that can restore the growth of riverside plants.

In terms of ecological restoration of river bank slopes, concrete planting frames, geotechnical material composite planting bases, barbed wire and gravel composite bases, geotechnical material soil-fixing planting bases, vegetation-type ecological concrete, cement ecological planting bases, and soil curing agents are often used for river bank restoration. The ecological restoration of the slope has a good effect on stabilizing the bank slope structure, improving the slope bank landscape to a certain extent, and has a certain effect of intercepting and purifying the non-point source pollution of rainfall runoff with small flows. However, the above ecological materials generally have problems of poor durability and replantability, and the time for rainfall runoff to flow through the slope is short, so pollutants cannot be effectively removed. When the rainfall runoff flow is large, the interception and purification effect is more limited.

Contents of the invention

The present invention proposes an ecological restoration method for concrete bank revetment slopes, which aims to overcome the shortcomings of the above-mentioned ecological restoration technology for hard slopes, and has good landscape effects and purification effects.

The technical scheme of the present invention: it is characterized in that (1) during construction, 1) roughen the slope of the concrete revetment, and build small grooves; 2) arrange geocells on the roughened slope, and lay 80mm thick 3) Spray ecological mud with a thickness of 120mm. (2) Set up a rectangular sandless concrete sump on the side of the road at the junction of the road and the bank slope, and lay a gravel cushion with a diameter of Φ20-50 at the bottom of the tank. (3) Set permeable sand-free concrete drainage ditches perpendicular to the sump every certain distance on the concrete revetment slope, and the two sides of the drainage ditch are composed of permeable sand-free concrete ridges. (3) Set an impermeable sand-free concrete overflow ridge between the rectangular sand-free concrete sump and the permeable sand-free drainage ditch, and fill the sump and drainage ditch with Φ100-200 gravel.

Effect and benefit of the present invention are:

(1) This method adopts the structure of "geocell + gravel material cushion + ecological mud", which is stable and safe, and can effectively fix the ecological mud before the vegetation grows on the slope surface to prevent landslides along the hard slope.

(2) This method restores green vegetation to the concrete revetment slope, beautifies the river bank slope environment, forms a beautiful green waterfront landscape, provides rich food sources and a good habitat for birds, amphibians and other organisms, and improves the quality of the river. Ecosystem, and the root system of the vegetation will strengthen the river bank after it grows up.

(3) This method has a better interception and purification effect on rainfall runoff non-point source pollution. When the surface runoff is small, the rainwater flows into the sump, and seeps into the river through the gravel area, permeable sand-free concrete, slope filter material and plant roots, etc., and the impermeable overflow ridge does not overflow, so that the water quality is improved. degree of improvement. When the surface runoff is large, the water body of the sump overflows to the slope drainage ditch through the impermeable overflow ridge, and quickly infiltrates into the river, and the water quality will also be improved to a certain extent.

(4) The ecological mud used in this method adopts ecological materials, which not only has a certain anti-scouring strength, but also can be used as a substrate for vegetation growth, breaking through the limitations of high alkalinity and non-durability of traditional ecological materials. Indoor geogrid, low cost, simple operation.

Description of drawings

Accompanying drawing 1 is the schematic plan view of the ecological restoration method of concrete revetment slope.

Accompanying drawing 2 is A-A sectional view among Fig. 1.

Accompanying drawing 3 is B-B sectional view among Fig. 1.

Accompanying drawing 4 is the sectional view of the water-permeable sand-free concrete sump.

In the figure, 1 is concrete slope protection, 2 is drainage ditch, 3 is road, 4 is permeable sand-free concrete sump, 5 is gravel cushion, 6 is impermeable concrete overflow ridge, 7 is overflow of sump, 8 100-200 gravel, 9 is permeable sand-free concrete ridge, 10 is high-density polyethylene strip, 11 is geocell, 12 is gravel material cushion of slope cell, 13 is ecological mud, and 14 is plant.

Detailed ways

Referring to accompanying drawing 1, the method for ecological restoration of concrete revetment slope, a rectangular sandless concrete sump 4 is set on the side of the road at the junction of the road and the bank slope, and a gravel cushion 5 with a diameter of Φ20-50 is laid on the bottom of the tank. Permeable sand-free concrete drainage ditches 2 perpendicular to the sump 4 are arranged at regular intervals on the slope of the concrete revetment 1, and both sides of the drainage ditch 2 are formed of permeable sand-free concrete ridges 9. An impermeable sand-free concrete overflow ridge 6 is set between the rectangular sand-free concrete sump 4 and the permeable sand-free drainage ditch 2, and the sump 4 and the drainage ditch 2 are filled with Φ100-200 gravel. During construction, roughen the slope of the concrete revetment 1, and build a small groove; arrange a geocell 11 on the roughened slope, and lay an 80mm thick slope cell sand and gravel cushion 12 in the geocell 11, and finally Spray ecological mud 13, thick 120mm.

The geocell 11 is a mesh cell structure formed by strong welding of reinforced high-density polyethylene strips 10 at set intervals. The typical high-density polyethylene strip 10 of the present invention has a thickness of 2mm and a width of 200mm, and is welded every 300mm. On the high-density polyethylene strip 10, permeable holes with a diameter of 10mm are drilled at intervals of 50mm. The ecological mud 13 is made by mixing soil, straw powder, cow dung, grass seeds, cement, etc. in a certain ratio (10:8:5:1:3).

The construction period should be selected during the low water level period of the river. The grass species in the ecological mud 13 on the slope above the normal water level selects perennial herbaceous plants with well-developed root system and strong absorption capacity for pollutants, such as bermudagrass, tall fescue, zoysia, etc.; the ecological mud on the slope below the normal water level The grass species in the mud 13 is selected to have aquatic plants with strong absorption capacity for pollutants, such as bitter grass, black algae, hornwort and the like.

The slope surface repaired by the technology of the present invention not only restores green plants, improves the ecological environment of the river bank, provides abundant food sources and a good habitat for creatures such as birds and amphibians, and improves the river ecological system, but also improves the ecological environment of the river bank. Gravel, ecological mud, and plant roots are prone to gather microorganisms to form biofilms. Through physical adsorption filtration, plant absorption, and microbial degradation, it can effectively intercept and purify rainfall runoff non-point source pollution. When the surface runoff caused by rainfall is small, the rainwater flows to the sump, and seeps into the river through the gravel area, permeable sand-free concrete, slope cushion and plant roots, etc., and the impermeable overflow ridge does not overflow. Physicochemical and biological actions such as adsorption, plant absorption and microbial degradation purify non-point source pollutants, thereby improving water quality to a large extent. When the surface runoff is large, the water body of the sump overflows to the slope drainage ditch through the impermeable overflow ridge, and quickly seeps into the river. Through the interception of gravel in the drainage ditch and microbial degradation, the water quality will also be improved to a certain extent. Improve, and play a role in protecting slope plants.

Claims (6)

1. converted steel reinforced concrete shore protection slope ecological restoring method, when it is characterized in that (1) construction, 1) with the domatic hacking of concrete revetment, build little groove; 2) on the bank protection of hacking, arrange geotechnical grid, in geotechnical grid, lay the thick domatic lattice chamber sandy gravel bed course of 80mm, 3) spray and water ecological mud, thick 120mm;

(2) road one side at road and bank slope intersection is provided with rectangle sand concrete free catch basin, and bottom land is laid diameter of phi 20～50 hardcore beds; (3) on the concrete revetment slope, be provided with and the perpendicular permeable sand concrete free gutter of catch basin at a certain distance, the both sides, gutter are made up of the permeable sand concrete free ridge; (3) between rectangle sand concrete free catch basin and the permeable no sand gutter the waterproof sand concrete free overflow ridge is set, fills Φ 100～200 gravels in catch basin and the gutter.

2. converted steel reinforced concrete shore protection according to claim 1 slope ecological restoring method; It is characterized in that on the concrete slope, adopting mechanical hacking smooth surface; And the layout geotechnical grid, geotechnical grid is every at a distance from setting the netted lattice cell structure that spacing forms with the brute force welding, high density polyethylene (HDPE) bar tape thickness 2mm, wide 200mm by the high density polyethylene (HDPE) band of strengthening; Every separated 300mm welds, and every interval 50mm beats the permeable hole that diameter is 10mm on the high density polyethylene (HDPE) band.

3. concrete revetment according to claim 1 slope ecological restoring method, it is characterized in that ecological mud be by soil, powder of straw, cow dung, grass seeds, cement by 10: 8: 5: mixed was processed in 1: 3.

4. converted steel reinforced concrete shore protection according to claim 1 slope ecological restoring method; It is characterized in that the construction period should be chosen in river low water level period; Grass seed selection well developed root system more than the ordinary water level in the domatic ecological mud has herbaceos perennial Bermuda grass, Festuca Arundinacea, the Korea lawn grass of strong absorptive capacity to pollutant; Grass seed selection in the domatic ecological mud below the ordinary water level has the eel grass of strong absorptive capacity, black algae, hornwort water plant to pollutant.

5. converted steel reinforced concrete shore protection according to claim 1 slope ecological restoring method is characterized in that the permeable sand concrete free ridge of bank slope bottom joins with the steel bar concrete bank protection down, and surface and geotechnical grid surface flush.

6. converted steel reinforced concrete shore protection according to claim 1 slope ecological restoring method; It is characterized in that flow path surface hour; Catch basin compiles surface flow; And penetrate into domatic geotechnical grid through the sand concrete free cell wall, and water body further purifies through the plant of geotechnological lattice filtrate and ecological mud, and water quality improves; When face of land run-off was big, the water yield that catch basin compiles was big, and the water body that is difficult to permeate overflows to the slope drainage ditch by the waterproof overflow ridge, and along letting out the river under the ditch, gravel filters this part water body through the gutter, and water quality also can improve.

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