CN102071697A - Hard reinforced concrete revetment slope biological repairing method - Google Patents

Abstract

The invention is an ecological restoration method for a hard reinforced concrete bank revetment slope, which is characterized in that the concrete bank revetment is roughened, and drainage ditches are constructed at set distances. Excavate the sump on the side of the road at the intersection of the revetment and the road, and leave an opening at the junction with the drainage ditch to build an impermeable concrete overflow ridge. Fill sumps and gutters with gravel. The geocell is welded with high-density polyethylene strips on the slope protection, and the sand and gravel cushion is laid in the geocell, and finally the ecological mud is sprayed. Advantages: stable and safe, rainwater flows into the sump, and seeps into the river through the gravel area, permeable sand-free concrete, slope cushion and plant roots, etc., so that the water quality is greatly improved. When the rainfall runoff flows through When it is heavy, the rainwater overflows from the overflow ridge, passes through the gravel in the drainage ditch, and the water quality will be purified to a certain extent, and it will also protect the slope. The ecological mud sprayed on the slope is made of ecological materials, which not only has a certain anti-scouring strength, but also can be used as a substrate for vegetation growth, with low cost and simple operation.

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 riverbank 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, etc., 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. The ecological restoration method of hard reinforced concrete revetment slope is characterized in that (1) during construction, 1) the concrete revetment slope surface is roughened, and small grooves are built; 2) geocells are arranged on the roughened revetment slope, and Lay 80mm thick slope cell gravel material cushion in the geocell, 3) spray ecological mud, 120mm thick; Lay a gravel cushion with a diameter of Φ20-50; (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) ) An impermeable sand-free concrete overflow ridge is set between the rectangular sand-free concrete sump and the permeable sand-free drainage ditch, and the sump and drainage ditch are filled with Φ100-200 gravel. 2. The method for ecological restoration of hard reinforced concrete bank revetment slope according to claim 1, characterized in that the smooth surface is smoothed by mechanical means on the concrete slope, and geocells are arranged. The geocell is a mesh cell structure formed by reinforced high-density polyethylene strips that are welded at set intervals. The high-density polyethylene strips are 2mm thick and 200mm wide, and are welded every 300mm. Permeable holes with a diameter of 10mm are drilled at intervals of 50mm on the density polyethylene strip. 3. The ecological restoration method for concrete revetment slopes according to claim 1, wherein the ecological mud is made by mixing soil, straw powder, cow dung, grass seeds, and cement in a ratio of 10:8:5:1:3. 4. the method for ecological restoration of hard reinforced concrete bank revetment slopes according to claim 1 is characterized in that the construction period should be selected in the low water level period of the river, and the grass species in the ecological mud on the slope above the normal water level is selected with well-developed root system, which has a strong impact on pollution. Perennial herb bermudagrass, tall fescue, and zoysia with strong absorption capacity for pollutants; the grass species in the ecological mud on the slope below the normal water level choose bitter grass, black algae, and goldfish with strong absorption capacity for pollutants Algae aquatic plants. 5. The method for ecological restoration of a hard reinforced concrete revetment slope according to claim 1, characterized in that the permeable sand-free concrete ridge at the bottom of the bank connects with the reinforced concrete revetment, and the surface is flush with the surface of the geocell. 6. The method for ecological restoration of hard reinforced concrete revetment slope according to claim 1, characterized in that when the surface runoff is small, the sump collects the surface runoff, and penetrates into the geocell of the slope through the sandless concrete groove wall, The water body is further purified by geotechnical lattice filter material and ecological mud plants, etc., and the water quality is improved; when the local surface runoff is large, the amount of water collected in the sump is large, and the impermeable water overflows from the impermeable overflow ridge to the slope Drainage ditch, and discharge to the river along the ditch, this part of the water body will be filtered by the gravel of the drainage ditch, and the water quality will also be improved.

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