CN113431060B - Variable cross-section root pile and film bag concrete combined drainage greening slope protection structure and method - Google Patents

Abstract

The invention provides a structure and method for combined drainage and greening of variable cross-section tree root piles and membrane bag concrete. effect, laying a geomembrane bag on the surface of the slope soil, the inside of the geomembrane bag is filled with a film bag filler; the geomembrane bag is fixed by fixing the pedestal on the top of the self-stress expansion tree root pile; Rigid confinement discs are arranged at equal intervals on the self-stress expansion tree root piles, and ordinary cement slurry and self-stress expansion cement slurry are filled between the self-stress expansion tree root piles. By improving the ordinary tree root piles into variable cross-section self-stress expansion tree root piles, the pullout resistance of the tree root piles is improved. Combined with membrane bag concrete technology, the slope can be greened and the infiltration of rainwater can be prevented. It greatly reduces the ability of rainwater to infiltrate and enhances the stability of the slope.

Description

Slope protection structure and method of variable cross-section tree root pile and membrane bag concrete combined drainage and greening

technical field

The invention belongs to facilities in the field of geotechnical engineering, and in particular relates to a variable-section tree root pile and membrane bag concrete combined drainage and greening slope protection structure and method, which are applied to slope support, geological disaster protection and other projects.

Background technique

Tree root piles are similar to friction piles, which can bear both vertical loads and horizontal loads. Pressure grouting can make the outside of the piles closely bonded to the soil to obtain greater bearing capacity. It is often used in foundation underpinning, soft soil foundation reinforcement and other projects, but it is rarely used in slope engineering. The main reason is that the pile diameter of tree root piles is small and cannot provide sufficient pullout resistance.

For slope support treatment, in addition to supporting it, on the other hand, it is also necessary to pay attention to the impact of rainfall infiltration on the slope. When heavy rainfall falls on the surface of the slope, part of the water will form runoff on the surface, which will affect the slope. The slope causes erosion, taking away the soil particles on the surface of the slope; another part of the water infiltrates into the interior of the slope. The infiltration of rainwater gradually increases the water content in the upper part of the unsaturated area of the slope, and the matrix suction gradually decreases, resulting in a decrease in the shear strength of the soil, reducing the sliding resistance of the slope, and reducing the stability of the slope.

The slope stability problem has an extremely important position in engineering construction. In order to prevent slope instability, ensure the smooth progress of engineering construction and the safety of people's property, certain reinforcement and prevention measures must be taken for unstable and potentially dangerous slopes; especially for rapid support, There are many kinds of slope support and treatment technologies for emergency rescue and disaster relief projects: retaining walls, grid beams, lattice anchors, anchor shotcrete, herringbone skeleton slopes, etc. Although these mature technologies can The side slope is supported, but the construction cost is high and the construction period is long. It is not suitable for the engineering slope that needs emergency rescue and disaster relief, and it does not have the effect of greening the slope; although the more commonly used vegetation concrete technology can green the slope, However, landslide control cannot be taken into account, so it is urgent to develop an integrated technology that can achieve rapid construction, low cost, and can also take into account the greening of slopes and the control of landslides.

Contents of the invention

In order to solve the above problems, the present invention provides an improved variable-section tree root pile and membrane bag concrete joint drainage and greening slope protection method, which uses the improved self-stress expansion tree root pile and membrane bag concrete to carry out slope greening and support management; The ordinary tree root pile is improved into a variable cross-section self-stress expansion tree root pile, which improves the pullout resistance of the tree root pile itself. Combined with the membrane bag concrete technology, the slope can be greened and the infiltration of rainwater can be prevented. It greatly reduces the ability of rainwater to infiltrate and enhances the stability of the slope. This method can effectively solve the long construction period and high construction cost of the conventional slope support technology. While supporting the slope, it cannot take into account the slope greening The problem.

In order to realize above-mentioned technical characterictic, the object of the present invention is achieved like this: variable cross-section tree root pile and membrane bag concrete joint drainage greening slope protection structure, it comprises multiple groups of self-stress expansion tree root pile, described self-stress expansion tree root pile Buried inside the slope soil, and through the interaction between the self-stressed expansion tree root pile and the slope soil, it changes from the single force of the ordinary anchor rod or single pile of the slope to the joint force of the tree root pile and the soil , to improve the anti-skid performance of the slope; a geomembrane bag is laid on the surface of the slope soil, and the inside of the geomembrane bag is filled with a film bag filler; the geomembrane bag is fixed on the top of the self-stress expansion tree root pile The pedestal is fixed; the self-stress expansion tree root piles are equidistantly provided with rigid restraint plates, and the self-stress expansion tree root piles are filled with ordinary cement slurry and self-stress expansion cement slurry.

The diameter of the self-stressing expansion tree root pile is 100-300 mm, and the self-stressing expansion tree root pile adopts a hollow anchor rod as a reinforcement material, and a grouting hole is drilled on the hollow anchor rod, and the grouting pipe can be inserted into the hollow anchor rod for grouting .

The rigid confinement disks are fixed on the steel bars of the self-stress expansion tree root pile at a distance of 0.3-1 m, and the two spaced apart rigid confinement disks are filled with ordinary cement slurry and self-stress expansion cement slurry respectively, so that the self-stress expansion tree The pile body of the root pile is in the shape of "candied haws" to improve the boundary friction of the pile body.

A steel panel is installed between the fixed pedestal and the geomembrane bag, and a pressure-bearing plate is arranged on the lower surface of the fixed pedestal to prevent the contact surface between the fixing nut and the geomembrane bag from being too small to damage the concrete of the membrane bag, and evenly disperse the concrete from the geomembrane bag. Anchor tension.

The self-stress expansion cement slurry is composed of 5% to 30% expansion agent, cement and fly ash additives, adding fly ash to improve the fluidity and strength of the self-stress expansion cement slurry, adding 5% to 30% expansion After adding agent, it can make the cement slurry have the performance of self-stress expansion.

The geomembrane bag is sewn from geotextile with a thickness of 20-50cm. The inside of the geomembrane bag is a multi-layer structure. The number of layers and the thickness of each layer are set according to the actual thickness of the membrane bag and the actual needs of the project. The bottom layer is filled with concrete layer to prevent rainwater from infiltrating, the concrete of the concrete layer is added with fiber materials to reduce the cracking of concrete; the middle layer is a water storage and fertilizer layer, which is composed of ceramsite and sawdust water-retaining materials; Provide vegetative soil.

The vegetation humus filling is composed of plant seeds, humus, clay, sand, cement, and water, and its composition ratio is 1:1:1:1.5:2.5:3.

The surface layer of the film bag is made of burlap, which has small air-permeable holes on the surface. In addition, the surface burlap is also provided with holes with a diameter of 0.5-1 cm to increase the excavation rate of vegetation.

The construction method of the variable-section tree root pile and membrane bag concrete combined drainage and greening slope protection structure includes the following steps:

Step 1, cleaning the slope surface: Before laying the geomembrane bag for construction, first level the surface of the slope to prevent sharp stones from cutting and piercing the membrane bag;

Step 2: Design of tree root piles: For the design of self-stressed expansion tree root piles with reticular structure to reinforce the slope soil, the arrangement of self-stressed expansion tree root piles must be carried out first, and then the force mode shall be checked and calculated according to the layout situation. The calculation and analysis of the internal force and the external force are carried out; the calculation formula of the internal force is as follows:

Among them: F _R is the pulling force acting on each tree root pile, the unit is kN; P is the resistance that needs to be increased to avoid arc sliding, the unit is kN/m; S ₁ is the root of the tree root pile with a unit width of 1m β is the angle between the tree root pile and the vertical direction; α is the angle between the direction of the sliding force and the horizontal line; f is the expansion friction coefficient of the tree root pile with variable cross-section;

Step 3, Drilling: Use the casing follow-up method, the drilling rig speed is 200-220r/min, the hydraulic pressure is 1.5-2.5MPa, and the supporting water supply pressure is 0.1-0.3MPa. After drilling to the design elevation, the hole must be cleaned and controlled. The size of the water supply pressure until clear water flows out of the orifice;

Step 4, hanging steel bars and grouting pipes: The steel bars with rigid restraint discs should be hoisted as much as possible at one time to avoid affecting the hole wall. The outer tube wall is smooth and easy to pull out;

Step 5: Segmented grouting of pile body: There should be two machines for grouting, one for ordinary grouting and the other for self-stress expansion grouting. When grouting, the lifting length of the two grouting pipes should be calculated , to distinguish the grouting grout in adjacent sections, and at the same time, the grouting pressure should be well controlled so that the grout rises up evenly and the grouting pipe can be pulled out as it is injected during the grouting process. The grouting pipe must be buried in the grout for 2~ 3m to ensure the quality of the slurry;

Step 6, laying the membrane bag: according to the spacing of the self-stress expansion tree root piles, reserve the corresponding installation holes on the geomembrane bag, and then lay the geomembrane bag on the slope surface from top to bottom, so that the geomembrane bag The reserved holes on the tree are aligned with the root pile;

Step 7, grouting on the bottom of the film bag: after the film bag is laid, inject the prepared cement slurry into the first layer of film bag;

Step 8, filling of vegetation decay on the surface of the film bag: after the initial setting of the cement slurry at the bottom layer, the vegetation decay on the surface of the film bag is filled.

The present invention has following beneficial effect:

1. The diameter of the self-stressing expansion tree root pile described in the present invention is 100-300 mm, and the rigid restraint discs are fixed on the steel bars of the tree root pile at intervals of 0.3-1 m, and ordinary cement is respectively filled between the two spaced apart rigid restraint discs Slurry and self-stress expansion cement slurry can make the pile body of the root pile take the shape of "candied haws", which can increase the boundary friction resistance of the pile body, thereby improving the pullout resistance of the self-stress expansion tree root pile with variable cross-section. The effect of can restrain the axial stress of the expansive cement slurry, so that the expansion stress develops radially.

2. In the present invention, tree root piles are used to support the slope. Due to the smaller diameter, the power fluid of the drilling rig used is smaller, so the required construction site is smaller, thereby reducing the disturbance to the slope during construction.

3. A steel panel is installed between the fixed pedestal of the present invention and the convex geomembrane bag concrete, and a pressure-bearing plate is arranged between the upper surface of the fixed pedestal and the fixing nut to avoid contact between the fixing nut and the geomembrane bag. Too small to destroy the membrane bag concrete, which can evenly disperse the pulling force of the anchor rod.

4. The self-stress expansion cement slurry of the present invention is mainly composed of 5% to 30% expansion agent, cement and fly ash and other additives. Adding fly ash can improve the fluidity and strength of the self-stress expansion cement slurry. Add 5 % to 30% of the expansion agent can make the cement slurry have the performance of self-stress expansion, thereby enhancing the pullout resistance of the tree root pile.

5. The geomembrane bag of the present invention is sewn from geotextile, with a thickness of 20 to 50 cm. The inside of the film bag is a multi-layer structure. The number of layers and the thickness of each layer are set according to the actual thickness of the film bag and the actual needs of the project. , the bottom layer is filled with concrete, which can prevent rainwater from seeping into the slope, effectively reduce the scouring effect of rainfall on the slope, and enhance the stability of the slope itself. Fiber materials are added to the concrete to reduce the cracking of the concrete and improve the concrete itself. stability.

6. The middle layer of the present invention is a water storage and fertilizer retention layer, which is mainly composed of water-absorbing and water-retaining materials such as ceramsite and sawdust; it can effectively absorb a part of infiltrating water and provide nutrients for the growth of vegetation.

7. The surface layer of the film bag of the present invention is filled with vegetation humus fillings, which can provide vegetation soil for vegetation growth. The filling is mainly composed of plant seeds, humus, clay, sand, cement, water and other additives, and its composition ratio is 1:1:1:1.5:2.5:3. pumpability.

8. The surface layer of the film bag according to the present invention is made of burlap, and has small air-permeable holes on the surface. In addition, the surface burlap is also provided with holes with a diameter of 0.5-1 cm to increase the excavation rate of vegetation.

9. The present invention improves ordinary tree root piles into variable cross-section self-stress expansion tree root piles, which improves the pullout resistance of the tree root piles themselves. Combined with membrane bag concrete technology, the slope can be greened and rainwater can be prevented. Infiltration greatly reduces the ability of rainwater to infiltrate and enhances the stability of the slope. This method can effectively solve the problem of long construction period and high construction cost of conventional slope support technology. While supporting the slope, it cannot Taking into account the problem of slope greening.

Description of drawings

The present invention will be further described below in conjunction with drawings and embodiments.

Fig. 1 is a schematic diagram of the structure of the root pile of the present invention.

Fig. 2 is a schematic diagram of the action of the tree root pile combined with membrane bag concrete on the embankment structure of the present invention.

Fig. 3 is a schematic diagram of a slope supported by tree root piles combined with membrane bag concrete according to the present invention.

In the figure: self-stress expansion tree root pile 1, fixed pedestal 2, rigid restraint plate 3, self-stress expansion cement slurry 4, geomembrane bag 5, film bag filling 6, grouting hole 7, steel panel 8, fixing nut 9. Pressure bearing plate 10, concrete layer 11, water storage and fertilizer retention layer 12, film bag surface layer 13, vent hole 14, hollow anchor rod 15, and ordinary cement slurry 16.

Detailed ways

Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

Example 1:

Referring to Fig. 1-3, variable cross-section tree root piles and membrane bag concrete combined drainage and greening slope protection structure, which includes multiple sets of self-stress expansion tree root piles 1, and the self-stress expansion tree root piles 1 are buried inside the slope soil, Furthermore, through the interaction between the self-stressed expansion tree root pile 1 and the slope soil, it changes from the single force of the ordinary anchor rod or single pile of the slope to the joint force of the tree root pile and the soil, and improves the anti-slide performance of the slope A geomembrane bag 5 is laid on the surface of the slope soil, and the inside of the geomembrane bag 5 is filled with a film bag filler 6; 2 for fixing; the self-stressing expansion tree root piles 1 are equidistantly provided with rigid restraint discs 3, and the self-stressing expansion tree root piles 1 are filled with ordinary cement slurry 16 and self-stressing expansion cement slurry 4. By adopting the slope protection structure of the above structure, through the interaction between the self-stressed expansion tree root pile 1 and the slope soil, it changes from the single stress of the ordinary anchor rod or single pile of the slope to the common stress of the tree root pile and soil. At the same time, use geomembrane bag 5 concrete for slope protection and greening to prevent rainwater from scouring and infiltrating the slope, reduce the probability of landslides, and improve slope stability.

Further, the diameter of the self-stressing expansion tree root pile 1 is 100-300mm, and the self-stressing expansion tree root pile 1 adopts a hollow anchor rod 15 as a reinforcement material, and the hollow anchor rod 15 is drilled with a grouting hole 7, and the grouting pipe can be Insert the hollow anchor rod 15 for grouting. The above-mentioned hollow anchor rod 15 can be used for subsequent grouting of tree root piles, thereby enhancing the anchoring force between the anchor rod and the soil.

Further, the rigid confinement disks 3 are fixed on the steel bars of the self-stress expansion tree root pile 1 at a distance of 0.3-1 m, and the spaced apart rigid confinement disks 3 are filled with ordinary cement slurry 16 and self-stress expansion cement respectively. Slurry 4, make the pile body of self-stress expansion tree root pile 1 be " candied haws " shape, to improve the boundary frictional resistance of pile body. By adopting the above-mentioned bolt grouting process, the anchoring force of the bolt is improved, the boundary friction of the pile body can be improved, and the pullout resistance of the self-stressed expansion tree root pile with variable cross-section can be improved, and the effect of the rigid restraint plate can make the expansion The axial stress of the cement slurry is constrained so that its expansion stress develops radially.

Further, a steel panel 8 is installed between the fixed pedestal 2 and the geomembrane bag 5, and a pressure bearing plate 10 is arranged on the lower surface of the fixed pedestal 2 to prevent the contact surface between the fixed nut 9 and the geomembrane bag 5 from being too small And destroy the membrane bag concrete, and evenly disperse the pulling force from the anchor rod. The pressure resistance of the geomembrane bag 5 can be enhanced by adopting the steel panel 8 with the above structure, thereby effectively preventing it from being crushed.

Further, the self-stressing expansion cement slurry 4 is composed of 5% to 30% expansion agent, cement and fly ash additives, adding fly ash to improve the fluidity and strength of the self-stressing expansion cement slurry 4, adding 5% ~30% of the expansion agent can make the cement slurry have the performance of self-stress expansion. By using the above self-stress expansion cement slurry 4 to form a local expansion part, the pull-out resistance of the self-stress expansion tree root pile 1 is further enhanced.

Further, the geomembrane bag 5 is sewn from geotextile, with a thickness of 20 to 50 cm. The inside of the geomembrane bag is a multi-layer structure, and the number of layers and the thickness of each layer are set according to the actual thickness of the geomembrane bag and the actual needs of the project. The bottom layer is filled with a concrete layer 11 to prevent rainwater from infiltrating, and fiber materials are added to the concrete of the concrete layer 11 to reduce the cracking of the concrete; the middle layer is a water storage and fertilizer layer 12, which is composed of ceramsite and sawdust water-retaining materials; the membrane bag surface layer 13 is filled with vegetation The humus filling provides vegetative soil for vegetation growth. By adopting the geomembrane bag 5 with the above-mentioned structure, after filling the concrete layer 11, the anti-scouring performance of its surface layer is enhanced. The normal growth of vegetation is guaranteed by filling the vegetation decay filling.

Further, the vegetation humus filling is composed of plant seeds, humus, clay, sand, cement, and water, and its composition ratio is 1:1:1:1.5:2.5:3. By using the above-mentioned vegetation humus filling, sufficient nutrients can be provided for the production of plants, thereby ensuring the normal growth of the preparation.

Further, the surface layer 13 of the film bag is made of burlap, and has small air-permeable holes 14 on the surface. In addition, the surface burlap is also provided with holes with a diameter of 0.5-1 cm to increase the excavation rate of vegetation. The ventilation hole 14 mentioned above can facilitate the ventilation of the geomembrane bag 5, thereby ensuring the growth of the preparation.

Example 2:

The construction method of the variable-section tree root pile and membrane bag concrete combined drainage and greening slope protection structure includes the following steps:

Step 1, cleaning the slope surface: Before laying the geomembrane bag 5 for construction, first level the surface of the slope to prevent sharp stones from cutting and piercing the membrane bag;

Step 2, the design of tree root piles: for the design of self-stressed expansion tree root piles 1 with reticular structure to reinforce the slope soil, the arrangement of self-stressed expansion tree root piles 1 must be carried out first, and then the stress mode shall be checked and calculated according to the layout conditions. Calculate and analyze the internal force and external force; the internal force calculation formula is as follows:

Among them: F _R is the pulling force acting on each tree root pile, the unit is kN; P is the resistance that needs to be increased to avoid arc sliding, the unit is kN/m; S ₁ is the root of the tree root pile with a unit width of 1m β is the angle between the tree root pile and the vertical direction; α is the angle between the direction of the sliding force and the horizontal line; f is the expansion friction coefficient of the tree root pile with variable cross-section;

Step 3, Drilling: Use the casing follow-up method, the drilling rig speed is 200-220r/min, the hydraulic pressure is 1.5-2.5MPa, and the supporting water supply pressure is 0.1-0.3MPa. After drilling to the design elevation, the hole must be cleaned and controlled. The size of the water supply pressure until clear water flows out of the orifice;

Step 4, hanging steel bars and grouting pipes: The steel bars with rigid restraint disc 3 should be hoisted as much as possible at one time to avoid affecting the hole wall. Make the outer tube wall smooth and easy to pull out;

Step 5: Segmented grouting of the pile body: two machines should be used for grouting, one for ordinary grout 16, and the other for self-stress expansion grout 4, the grouting of the two grouting pipes should be calculated Elevate the length to distinguish the grouting grout in adjacent sections. At the same time, the grouting pressure should be well controlled so that the grout rises evenly and the grouting pipe can be pulled out during the grouting process. The grouting pipe must be buried in the grout 2~3m to ensure the quality of the slurry;

Step 6, laying the membrane bag: According to the spacing arranged by the self-stress expansion tree root pile 1, the corresponding installation holes are reserved on the geomembrane bag 5, and then the geomembrane bag 5 is laid on the slope surface from top to bottom, so that The reserved hole on the geomembrane bag 5 is aligned with the tree root pile;

Step 7, grouting on the bottom of the film bag: after the film bag is laid, inject the prepared cement slurry into the first layer of film bag;

Step 8, filling of vegetation decay on the surface of the film bag: after the initial setting of the cement slurry at the bottom layer, the vegetation decay on the surface of the film bag is filled.

Claims (4)

1. The construction method of variable cross-section tree root pile and membrane bag concrete joint drainage and greening slope protection structure, said variable cross-section tree root pile and membrane bag concrete joint drainage greening slope protection structure includes multiple groups of self-stress expansion tree root piles (1), so The self-stressing expansion tree root pile (1) is buried inside the slope soil, and then through the interaction between the self-stressing expansion tree root pile (1) and the slope soil, it is formed by the ordinary anchor rod or single pile of the slope. The single force becomes the joint force of the tree root pile and the soil to improve the anti-slide performance of the slope; a geomembrane bag (5) is laid on the surface of the slope soil, and the inside of the geomembrane bag (5) is filled with a film The bag filler (6); the geomembrane bag (5) is fixed by being fixed on the fixed pedestal (2) at the top of the self-stressing expansion tree root pile (1); equidistant on the self-stressing expansion tree root pile (1) A rigid confinement plate (3) is provided, and ordinary cement slurry (16) and self-stress expansion cement slurry (4) are filled between the self-stress expansion tree root piles (1); The self-stress expansion tree root pile (1) has a diameter of 100-300 mm, and the self-stress expansion tree root pile (1) adopts a hollow anchor rod (15) as a reinforcement material, and the hollow anchor rod (15) is drilled with a grouting hole ( 7), the grouting pipe can be inserted into the hollow anchor rod (15) for grouting; The rigid restraint discs (3) are fixed on the steel bars of the self-stressed expansion tree root pile (1) at intervals of 0.3 to 1 m, and ordinary cement slurry (16) is filled between the two spaced apart rigid restraint discs (3). and self-stress expansion cement slurry (4), so that the pile body of the self-stress expansion tree root pile (1) is in the shape of "candied haws", so as to improve the boundary friction of the pile body; The self-stress expansion cement slurry (4) is composed of 5% to 30% expansion agent, cement and fly ash additives, adding fly ash to improve the fluidity and strength of the self-stress expansion cement slurry (4), adding 5 %~30% expansion agent, can make the cement slurry have the performance of self-stress expansion; The geomembrane bag (5) is sewn from a geotextile with a thickness of 20 to 50 cm. The inside of the geomembrane bag has a multi-layer structure, and the number of layers and the thickness of each layer are set according to the actual thickness of the film bag and the actual needs of the project. The bottom layer is filled with a concrete layer (11) to prevent rainwater from infiltrating, and fiber materials are added to the concrete of the concrete layer (11) to reduce cracking of the concrete; the middle layer is a water storage and fertilizer layer (12), which is composed of ceramsite and sawdust water retention materials; The bag surface layer (13) is filled with vegetation humus fillings to provide vegetation soil for vegetation growth; It is characterized in that the construction method comprises the following steps: Step 1, cleaning the slope surface: Before laying the geomembrane bag (5) for construction, first level the surface of the slope to prevent sharp stones from cutting and piercing the membrane bag; Step 2, the design of tree root piles: for the design of self-stressed expansion tree root piles (1) with network structure to reinforce the slope soil, the arrangement of self-stressed expansion tree root piles (1) must be carried out first, and then check and calculate according to the arrangement Force mode, calculate and analyze the internal force and external force; the internal force calculation formula is as follows:

Among them: F _R is the pulling force acting on each tree root pile, the unit is kN; P is the resistance that needs to be increased to avoid arc sliding, the unit is kN/m; S ₁ is the root of the tree root pile with a unit width of 1m β is the angle between the tree root pile and the vertical direction; α is the angle between the direction of the sliding force and the horizontal line; f is the expansion friction coefficient of the tree root pile with variable cross-section; Step 3, Drilling: Use the casing follow-up method, the drilling rig speed is 200-220r/min, the hydraulic pressure is 1.5-2.5MPa, and the supporting water supply pressure is 0.1-0.3MPa. After drilling to the design elevation, the hole must be cleaned and controlled. The size of the water supply pressure until clear water flows out of the orifice; Step 4, Hanging the steel bar and grouting pipe: The steel bar with the rigid restraint plate (3) should be hoisted as much as possible at one time to avoid affecting the hole wall. section, so that the outer tube wall is smooth and easy to pull out; Step five, segmental grouting of pile body: There should be two machines for grouting, one for ordinary grout (16), and the other for self-stress expansion grout (4), and two machines should be calculated when grouting The lifting length of the grouting pipe is to distinguish the grouting grout in adjacent sections. At the same time, the grouting pressure should be well controlled so that the grout rises up evenly. The grouting pipe can be pulled out during the grouting process. 2~3m in the cement slurry to ensure the quality of the slurry; Step 6, laying the membrane bag: according to the distance arranged by the self-stress expansion tree root pile (1), reserve the corresponding installation holes on the geomembrane bag (5), and then lay the geomembrane bag (5) from top to bottom On the slope surface, the reserved hole on the geomembrane bag (5) is aligned with the tree root pile; Step 7, grouting on the bottom of the film bag: after the film bag is laid, inject the prepared cement slurry into the first layer of film bag; Step 8, filling of vegetation decay on the surface of the film bag: after the initial setting of the cement slurry at the bottom layer, the vegetation decay on the surface of the film bag is filled. 2. According to the construction method of the variable cross-section tree root pile and membrane bag concrete combined drainage and greening slope protection structure according to claim 1, it is characterized in that: a steel frame is installed between the fixed pedestal (2) and the geomembrane bag (5). Panel (8), the lower surface of the fixed pedestal (2) is provided with a pressure plate (10), to avoid the contact surface between the fixed nut (9) and the geomembrane bag (5) is too small to damage the membrane bag concrete, and evenly disperse Pull from the anchor. 3. according to the construction method of the variable cross-section tree root pile and membrane bag concrete joint drainage and greening slope protection structure of claim 1, it is characterized in that: the vegetation humus filling is made of plant seeds, humus, clay, sand, It is composed of cement and water, and its composition ratio is 1:1:1:1.5:2.5:3. 4. according to the construction method of the described variable cross-section tree root pile and film bag concrete combined drainage and greening slope protection structure of claim 1, it is characterized in that: the film bag surface layer (13) is made of burlap, and the surface has small air-permeable Holes (14). In addition, the surface burlap is also provided with holes with a diameter of 0.5-1 cm to increase the excavation rate of vegetation.

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