CN113431060B - Variable cross-section root pile and film bag concrete combined drainage greening slope protection structure and method - Google Patents
Variable cross-section root pile and film bag concrete combined drainage greening slope protection structure and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 44
- 239000002689 soil Substances 0.000 claims abstract description 38
- 239000002344 surface layer Substances 0.000 claims abstract description 20
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 13
- 230000003993 interaction Effects 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000003864 humus Substances 0.000 claims description 19
- 238000010276 construction Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 8
- 239000011405 expansive cement Substances 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 239000003337 fertilizer Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 4
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- 239000004746 geotextile Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
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- 230000000996 additive effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000009958 sewing Methods 0.000 claims 1
- 230000008595 infiltration Effects 0.000 abstract description 7
- 238000001764 infiltration Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000009991 scouring Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
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- 238000010521 absorption reaction Methods 0.000 description 1
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- 239000011378 shotcrete Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009424 underpinning Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/202—Securing of slopes or inclines with flexible securing means
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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Abstract
The invention provides a variable cross-section root pile and film bag concrete combined drainage greening slope protection structure and method, wherein a self-stress expansion root pile is embedded in a side slope soil body, and then a geomembrane bag is laid on the surface layer of the side slope soil body through the interaction of the self-stress expansion root pile and the side slope soil body, and the interior of the geomembrane bag is filled with a film bag filler; the geomembrane bag is fixed by a fixing pedestal fixed on the top of the self-stress expansion tree root pile; rigid restraint plates are arranged on the self-stress expansion tree root piles at equal intervals, and common cement slurry and self-stress expansion cement slurry are filled between the self-stress expansion tree root piles. Through improving ordinary root stake into variable cross section self stress expansion root stake, improved root stake self uplift resistance, combine the membrane bag concrete technique, can afforest the side slope, can prevent again the infiltration of rainwater, very big reduction the ability that the rainwater infiltrated, strengthened the stability of side slope.
Description
Technical Field
The invention belongs to facilities in the field of geotechnical engineering, and particularly relates to a variable cross-section root pile and film bag concrete combined drainage greening slope protection structure and method, which are applied to projects such as slope support, geological disaster protection and the like.
Background
The tree root pile is similar to a friction pile, can bear vertical load and horizontal load, and can be tightly combined with the soil body through pressure grouting, so that the tree root pile obtains larger bearing capacity. The method is commonly used for foundation underpinning, soft soil foundation reinforcement and other projects, and is applied less in slope projects mainly because the pile diameter of the tree root pile is smaller and cannot provide enough uplift resistance.
For slope support treatment, besides supporting the slope, on the other hand, the influence of rainfall infiltration on the slope is also taken into consideration, when strong rainfall falls on the surface of the slope, a part of water forms runoff on the surface, so that the slope is scoured, and soil particles on the surface of the slope are taken away; the other part of water infiltrates into the slope. The infiltration of rainwater gradually increases the water content of the upper part of the unsaturated zone of the side slope, and the suction of the matrix is gradually reduced, so that the shear strength of the soil body is reduced, the slip resistance of the side slope is reduced, and the stability of the side slope is reduced.
The problem of slope stability plays an extremely important role in engineering construction. In order to prevent the instability of the side slope and ensure the smooth progress of engineering construction and the property safety of people, certain reinforcement and prevention measures must be taken for the side slope which is unstable and has potential danger; particularly, for emergency rescue and disaster relief projects needing to quickly support and treat side slopes, the existing side slope support treatment technologies are various: the method comprises the following steps that a retaining wall, grid beams, sash anchor rods, anchor shotcrete, a herringbone framework side slope and the like are adopted, the mature technologies can support the side slope, but the construction cost is high, the construction period is long, the method is not suitable for the engineering side slope needing emergency rescue and disaster relief, and the method does not have the function of greening the side slope; although the side slope can be greened by the existing common vegetation concrete technology, the landslide cannot be treated at the same time, so that the development of an integrated technology which can achieve rapid construction, is low in cost, can green the side slope and treat the landslide is particularly important.
Disclosure of Invention
In order to solve the problems, the invention provides an improved variable cross-section root pile and film bag concrete combined drainage greening slope protection method, which utilizes improved self-stress expansion root piles and film bag concrete to perform slope greening and support treatment; the common root pile is improved into the variable cross-section self-stress expansion root pile, the pulling resistance of the root pile is improved, the slope can be greened by combining a film bag concrete technology, the infiltration of rainwater can be prevented, the rainwater infiltration capacity is greatly reduced, and the stability of the slope is enhanced.
In order to achieve the technical features, the invention is realized as follows: the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure comprises a plurality of groups of self-stress expansion root piles, wherein the self-stress expansion root piles are buried in a slope soil body, and further, through the interaction between the self-stress expansion root piles and the slope soil body, the single stress of common anchor rods or single piles of a slope is changed into the joint stress of the root piles and soil, so that the anti-sliding performance of the slope is improved; a geomembrane bag is laid on the surface layer of the side slope soil body, and a membrane bag filler is filled in the geomembrane bag; the geomembrane bag is fixed by a fixing pedestal fixed on the top of the self-stress expansion tree root pile; rigid restraint plates are arranged on the self-stress expansion tree root piles at equal intervals, and common cement slurry and self-stress expansion cement slurry are filled between the self-stress expansion tree root piles.
The diameter of the self-stress expansion tree root pile is 100-300 mm, the self-stress expansion tree root pile adopts a hollow anchor rod as a reinforcing steel bar material, a grouting hole is drilled in the hollow anchor rod, and a grouting pipe can be inserted into the hollow anchor rod for grouting.
The rigid constraint plates are fixed on the steel bars of the self-stress expansion tree root pile at intervals of 0.3-1 m, and common cement paste and the self-stress expansion cement paste are respectively filled between every two rigid constraint plates, so that the pile body of the self-stress expansion tree root pile is in a shape of a sugarcoated haw, and the boundary frictional resistance of the pile body is improved.
Install the steel panel between solid fixed pedestal and the geomembrane bag, the lower surface of solid fixed pedestal sets up a bearing plate, avoids fixation nut and geomembrane bag contact surface too little and destroys the membrane bag concrete to the homodisperse comes from the pulling force of stock.
The self-stress expansive cement slurry consists of 5-30% of an expanding agent, cement and a fly ash additive, wherein the fly ash is added to improve the fluidity and strength of the self-stress expansive cement slurry, and the cement slurry can have the self-stress expansive performance after the 5-30% of the expanding agent is added.
The geomembrane bag is sewn by geotextile, the thickness of the geomembrane bag is 20-50 cm, the interior of the geomembrane bag is of a multilayer structure, the number of layers and the thickness of each layer are set according to the actual thickness of the geomembrane bag and the actual requirement of engineering, a concrete layer is filled at the bottom layer to prevent rainwater from permeating, and fiber materials are added into the concrete of the concrete layer to reduce the cracking of the concrete; the middle layer is a water and fertilizer storage layer and is composed of ceramsite and wood chip water-retaining materials; the surface layer of the film bag is filled with vegetation humus fillers to provide vegetation soil for vegetation growth.
The vegetation humus filler is composed of plant seeds, humus soil, clay, sandy soil, cement and water, and the composition proportion of the vegetation humus filler is 1:1:1:1.5:2.5:3 mixing the mixture.
The membrane bag top layer adopts coarse linen to weave and forms, and there is tiny ventilative hole on the surface, and in addition, the coarse linen in top layer still is equipped with the hole of diameter 0.5 ~ 1cm to increase the unearthed rate of vegetation.
The construction method of the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure comprises the following steps:
step one, cleaning a slope table: before the construction of laying the geomembrane bags, the surface of the slope is leveled, so that sharp stones are prevented from being cut and pierced through the geomembrane bags;
step two, designing the tree root pile: for the design of the self-stress expansion tree root pile of the net structure for reinforcing the side slope soil body, firstly, the self-stress expansion tree root pile must be arranged, then, the stress mode is checked according to the arrangement condition, and the internal force and the external force are calculated and analyzed; the internal force calculation formula is as follows:
wherein: f R The unit of the tension acting on each tree root pile is kN; p is resistance which needs to be increased for avoiding arc sliding and is expressed in kN/m; s 1 Is root of tree with unit width of 1mThe number of piles is counted; beta is an included angle between the tree root pile and the vertical direction; alpha is an included angle between the acting direction of the sliding force and the horizontal line; f is the expansion friction coefficient of the pile body of the variable cross-section tree root pile;
step three, drilling: adopting a sleeve following method, wherein the rotating speed of a drilling machine is 200-220 r/min, the hydraulic pressure is 1.5-2.5 MPa, the pressure of matched water supply is 0.1-0.3 MPa, the hole is required to be cleaned after the hole is drilled to the designed elevation, and the size of the water supply pressure is controlled until clean water flows out from one hole opening;
fourthly, hoisting the steel bars and the grouting pipes: the steel bars with the rigid restraint discs are hung as one time as possible to avoid influencing the hole wall, the grouting pipe adopts a seamless iron pipe, and an inner shrinkage joint is adopted at a joint to ensure that the outer pipe wall is smooth and is convenient to pull out;
step five, grouting the pile body in sections: two machines are used for grouting, one machine is used for grouting common cement paste, the other machine is used for grouting self-stress expansion cement paste, the lifting lengths of two grouting pipes are calculated during grouting so as to distinguish grouting paste of adjacent sections, grouting pressure is controlled well, so that the grouting pipes can be pulled out along with grouting in the grouting process when the paste uniformly flows upwards, and the grouting pipes are buried in the cement paste for 2-3 m to ensure the quality of the paste;
step six, laying a film bag: reserving corresponding mounting holes on the geomembrane bag according to the arrangement interval of the self-stress expansion tree root piles, and then paving the geomembrane bag on the surface of the side slope from top to bottom to ensure that the reserved holes on the geomembrane bag are aligned with the tree root piles;
seventhly, grouting the bottom surface of the film bag: after the membrane bag is laid, injecting the stirred cement slurry into a first membrane bag;
step eight, filling the surface layer of the film bag with the vegetation humus: and after the cement slurry at the bottom layer is initially set, the vegetation saprophyte on the surface layer of the film bag is filled, and when congestion occurs during filling, the vegetation saprophyte is dredged in a foot-operated extrusion mode.
The invention has the following beneficial effects:
1. the diameter of the self-stress expanded root pile is 100-300 mm, the rigid constraint plates are fixed on the reinforcing steel bars of the root pile at intervals of 0.3-1 m, common cement paste and self-stress expanded cement paste are respectively filled between every two rigid constraint plates, the pile body of the root pile can be in a shape of a sugarcoated haw, the boundary frictional resistance of the pile body can be improved, and further the pulling resistance of the self-stress expanded root pile with the variable cross section can be improved, wherein the axial stress of the expanded cement paste can be constrained under the action of the rigid constraint plates, and the expansion stress of the expanded cement paste can be developed in the radial direction.
2. According to the invention, the side slope is supported by the tree root piles, and the required construction site is smaller due to the smaller diameter and the smaller power liquid of the drilling machine, so that the disturbance to the side slope during construction is reduced.
3. According to the invention, the steel panel is arranged between the fixing pedestal and the convex geomembrane bag concrete, and the bearing plate is arranged between the upper surface of the fixing pedestal and the fixing nut, so that the condition that the geomembrane bag concrete is damaged due to too small contact surface between the fixing nut and the geomembrane bag is avoided, and the tensile force of the anchor rod can be uniformly dispersed.
4. The self-stress expansive cement paste mainly comprises 5-30% of an expanding agent, cement, fly ash and other additives, the fluidity and the strength of the self-stress expansive cement paste can be improved by adding the fly ash, and after the 5-30% of the expanding agent is added, the cement paste can have the self-stress expansive performance, so that the pulling resistance of the tree root pile is enhanced.
5. The geomembrane bag is made of geotextile in a sewn mode, the thickness of the geomembrane bag is 20-50 cm, the interior of the geomembrane bag is of a multilayer structure, the number of layers and the thickness of each layer are set according to the actual thickness of the geomembrane bag and the actual requirements of engineering, concrete is filled in the bottom layer, rainwater can be prevented from permeating into a side slope, the scouring effect of rainfall on the side slope is effectively reduced, the stability of the side slope is enhanced, and fiber materials are added into the concrete to reduce the cracking of the concrete and improve the stability of the concrete.
6. The middle layer is a water and fertilizer storage layer and mainly comprises water absorption and retention materials such as ceramsite, wood dust and the like; can effectively absorb a part of the infiltrated water and provide nutrients for the growth of vegetation.
7. The film bag surface layer is filled with the vegetation humus filler, and can provide vegetation soil for vegetation growth. The filling mainly comprises other additives such as plant seeds, humus soil, clay, sandy soil, cement, water and the like, and the composition proportion is 1:1:1:1.5:2.5:3, improving the pumpability of the vegetation humus filling.
8. The surface layer of the film bag is woven by the coarse linen, fine air-permeable holes are formed in the surface, and in addition, the coarse linen of the surface layer is also provided with holes with the diameter of 0.5-1 cm, so that the emergence rate of vegetation is increased.
9. The method improves the common root pile into the variable cross-section self-stress expansion root pile, improves the pulling resistance of the root pile, can green the side slope by combining the film bag concrete technology, can prevent the infiltration of rainwater, greatly reduces the rainwater infiltration capacity, and enhances the stability of the side slope.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a schematic view of a tree root pile structure according to the present invention.
FIG. 2 is a schematic view of the construction of the dam by combining the root pile with the bag concrete.
FIG. 3 is a schematic view of a root pile combined with a film bag concrete support slope of the present invention.
In the figure: the self-stress expansion tree root pile comprises a self-stress expansion tree root pile 1, a fixed pedestal 2, a rigid constraint disc 3, self-stress expansion cement slurry 4, a geomembrane bag 5, a film bag filler 6, a grouting hole 7, a steel panel 8, a fixing nut 9, a bearing plate 10, a concrete layer 11, a water and fertilizer storage layer 12, a film bag surface layer 13, a ventilation hole 14, a hollow anchor rod 15 and common cement slurry 16.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-3, the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure comprises a plurality of groups of self-stress expansion root piles 1, wherein the self-stress expansion root piles 1 are buried in a side slope soil body, and further the self-stress expansion root piles 1 and the side slope soil body are interacted, so that the side slope common anchor rod or single pile single stress is changed into the joint stress of the root piles and soil, and the side slope anti-sliding performance is improved; a geomembrane bag 5 is laid on the surface layer of a side slope soil body, and a film bag filler 6 is filled in the geomembrane bag 5; the geomembrane bag 5 is fixed by a fixing pedestal 2 fixed on the top of the self-stress expansion tree root pile 1; rigid restraint plates 3 are arranged on the self-stress expansion root piles 1 at equal intervals, and common cement slurry 16 and self-stress expansion cement slurry 4 are filled between the self-stress expansion root piles 1. By adopting the slope protection structure with the structure, the independent stress of the common anchor rod or single pile of the side slope is changed into the joint stress of the root pile and soil through the interaction of the self-stress expansion root pile 1 and the side slope soil body, so that the anti-sliding performance of the side slope is improved; meanwhile, slope protection and greening are performed by utilizing the geomembrane bag 5 concrete, so that rainwater is prevented from scouring and infiltrating the side slope, the probability of landslide is reduced, and the stability of the side slope is improved.
Further, the diameter of the self-stress expansion tree root pile 1 is 100-300 mm, the self-stress expansion tree root pile 1 adopts a hollow anchor rod 15 as a reinforcing steel bar material, a grouting hole 7 is drilled in the hollow anchor rod 15, and a grouting pipe can be inserted into the hollow anchor rod 15 for grouting. By adopting the hollow anchor rod 15, the subsequent grouting can be performed on the root pile, so that the anchoring force between the anchor rod and the soil body is enhanced.
Furthermore, the rigid constraint plates 3 are fixed on the steel bars of the self-stress expansion tree root pile 1 at intervals of 0.3-1 m, and common cement slurry 16 and self-stress expansion cement slurry 4 are respectively filled between every two rigid constraint plates 3, so that the pile body of the self-stress expansion tree root pile 1 is in a shape of a sugarcoated haw, and the boundary frictional resistance of the pile body is improved. By adopting the anchor rod grouting process, the anchoring force of the anchor rod is improved, the boundary frictional resistance of a pile body can be improved, and further the pulling resistance of the variable cross-section self-stress expansion root pile is improved, wherein the axial stress of the expansion cement slurry can be restrained under the action of the rigid restraining disc, so that the expansion stress of the expansion cement slurry is developed in the radial direction.
Further, install steel panel 8 between stationary pedestal 2 and the geomembrane bag 5, the lower surface of stationary pedestal 2 sets up a pressure-bearing plate 10, avoids fixation nut 9 and the geomembrane bag 5 contact surface too little and destroys the membrane bag concrete to the homodisperse comes from the pulling force of stock. The steel panel 8 with the structure can enhance the pressure resistance of the geomembrane bag 5, and further effectively prevent the geomembrane bag from being crushed.
Furthermore, the self-stress expansive cement slurry 4 consists of 5-30% of an expanding agent, cement and a fly ash additive, the fly ash is added to improve the fluidity and the strength of the self-stress expansive cement slurry 4, and after the 5-30% of the expanding agent is added, the cement slurry can have the self-stress expansion performance. By adopting the self-stress expansion cement slurry 4 to form the local expansion part, the drawing resistance of the self-stress expansion tree root pile 1 is enhanced.
Furthermore, the geomembrane bag 5 is sewn by geotextile, the thickness is 20-50 cm, the interior of the geomembrane bag is of a multilayer structure, the number of layers and the thickness of each layer are set according to the actual thickness of the geomembrane bag and the actual requirement of engineering, a concrete layer 11 is filled at the bottom layer to prevent rainwater from permeating, and fiber materials are added into the concrete of the concrete layer 11 to reduce the cracking of the concrete; the middle layer is a water and fertilizer storage layer 12 which is composed of ceramsite and wood chip water-retaining material; the surface layer 13 of the film bag is filled with vegetation humus fillers to provide vegetation soil for vegetation growth. By adopting the geomembrane bag 5 of the above structure, the anti-scouring performance of the surface layer thereof is enhanced after the concrete layer 11 is filled. The normal growth of the vegetation is ensured by filling the vegetation with the humus filling.
Further, the vegetation humus filling material is composed of plant seeds, humus soil, clay, sandy soil, cement and water, and the composition proportion is 1:1:1:1.5:2.5:3, mixing the mixture. By adopting the vegetation humus filling material, enough nutrients can be provided for the production of plants, and the normal growth of the preparation is further ensured.
Furthermore, the membrane bag surface layer 13 is woven by coarse linen, fine air-permeable holes 14 are formed in the surface, and in addition, holes with the diameter of 0.5-1 cm are further formed in the surface coarse linen so as to increase the soil emergence rate of vegetation. The ventilation of the geomembrane bag 5 can be facilitated through the ventilation holes 14, so that the growth of the preparation is ensured.
Example 2:
the construction method of the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure comprises the following steps:
step one, cleaning a slope table: before the geomembrane bag 5 is laid for construction, the surface of the slope is leveled, so that sharp stones are prevented from being cut and pierced through the geomembrane bag;
step two, designing the tree root pile: for the design of the self-stress expanded tree root pile 1 of the net structure for reinforcing the side slope soil body, firstly, the self-stress expanded tree root pile 1 must be arranged, then, a stress mode is checked according to the arrangement condition, and the internal force and the external force are calculated and analyzed; the internal force calculation formula is as follows:
wherein: f R The unit of the tension acting on each tree root pile is kN; p is resistance which needs to be increased for avoiding arc sliding and is expressed in kN/m; s 1 The number of the tree root piles in unit width of 1 m; beta is an included angle between the root pile and the vertical direction; alpha is an included angle between the acting direction of the sliding force and the horizontal line; f is the expansion friction coefficient of the pile body of the variable cross-section tree root pile;
step three, drilling: adopting a sleeve following method, wherein the rotating speed of a drilling machine is 200-220 r/min, the hydraulic pressure is 1.5-2.5 MPa, the pressure of matched water supply is 0.1-0.3 MPa, cleaning holes after drilling to a designed elevation, and controlling the size of the water supply pressure until clean water flows out of one hole opening;
fourthly, hoisting the steel bars and the grouting pipes: the steel bars with the rigid restraint plates 3 are hung as much as possible once, so that the hole wall is prevented from being influenced, the grouting pipe is a seamless iron pipe, and an inner shrinkage joint is adopted at a joint, so that the outer pipe wall is smooth and is convenient to pull out;
step five, grouting the pile body in sections: two machines are used for grouting, one machine is used for grouting ordinary cement slurry 16, the other machine is used for grouting self-stress expansion cement slurry 4, the lifting length of two grouting pipes is calculated during grouting so as to distinguish grouting slurry of adjacent sections, grouting pressure is controlled well, the grouting pipes can be pulled out along with grouting during grouting when slurry uniformly flows upwards, and the grouting pipes are buried in the cement slurry for 2-3 m so as to ensure the quality of the slurry;
step six, laying a film bag: reserving corresponding mounting holes on the geomembrane bags 5 according to the arrangement intervals of the self-stress expansion tree root piles 1, and then paving the geomembrane bags 5 on the surface of the side slope from top to bottom to ensure that the reserved holes on the geomembrane bags 5 are aligned with the tree root piles;
seventhly, grouting the bottom surface of the film bag: after the membrane bag is laid, pouring the mixed cement slurry into the first membrane bag;
step eight, filling the surface layer of the film bag with the humus substances: and after the cement slurry at the bottom layer is initially set, the vegetation saproped matters at the surface layer of the film bag are filled, and when congestion occurs during filling, the vegetation saproped matters are dredged by adopting a foot-treading extrusion mode.
Claims (4)
1. The variable cross-section tree root pile and film bag concrete combined drainage greening slope protection structure comprises a plurality of groups of self-stress expansion tree root piles (1), wherein the self-stress expansion tree root piles (1) are buried in a side slope soil body, and further through the interaction between the self-stress expansion tree root piles (1) and the side slope soil body, the single stress of a common anchor rod or a single pile of the side slope is changed into the common stress of the tree root piles and the soil, so that the anti-sliding performance of the side slope is improved; a geomembrane bag (5) is laid on the surface layer of the side slope soil body, and a film bag filler (6) is filled in the geomembrane bag (5); the geomembrane bag (5) is fixed by a fixing pedestal (2) fixed on the top of the self-stress expansion root pile (1); rigid restraint plates (3) are arranged on the self-stress expansion tree root piles (1) at equal intervals, and common cement slurry (16) and self-stress expansion cement slurry (4) are filled between the self-stress expansion tree root piles (1);
the diameter of the self-stress expansion tree root pile (1) is 100-300 mm, the self-stress expansion tree root pile (1) adopts a hollow anchor rod (15) as a reinforcing steel bar material, a grouting hole (7) is drilled in the hollow anchor rod (15), and a grouting pipe can be inserted into the hollow anchor rod (15) for grouting;
the rigid constraint plates (3) are fixed on the steel bars of the self-stress expansion tree root pile (1) at intervals of 0.3-1 m, common cement slurry (16) and self-stress expansion cement slurry (4) are respectively filled between every two rigid constraint plates (3), so that the pile body of the self-stress expansion tree root pile (1) is in a shape of a sugarcoated haw, and the boundary frictional resistance of the pile body is improved;
the self-stress expansive cement slurry (4) consists of 5-30% of an expanding agent, cement and a fly ash additive, the fly ash is added to improve the fluidity and strength of the self-stress expansive cement slurry (4), and after the 5-30% of the expanding agent is added, the cement slurry can have the self-stress expansive performance;
the geomembrane bag (5) is formed by sewing geotextile, the thickness is 20-50 cm, the interior of the geomembrane bag is of a multilayer structure, the number of layers and the thickness of each layer are set according to the actual thickness of the geomembrane bag and the actual requirement of engineering, a concrete layer (11) is filled at the bottom layer to prevent rainwater from permeating, and fiber materials are added into the concrete of the concrete layer (11) to reduce the cracking of the concrete; the middle layer is a water and fertilizer storage layer (12) which is composed of ceramsite and wood chip water-retaining material; the surface layer (13) of the film bag is filled with vegetation humus fillers to provide vegetation soil for vegetation growth;
the construction method is characterized by comprising the following steps:
step one, cleaning a slope table: before the geomembrane bag (5) is laid for construction, the surface of the slope is leveled, so that the membrane bag is prevented from being cut and pierced by sharp stones;
step two, designing the tree root pile: for the design of the self-stress expansion tree root pile (1) of the net structure for reinforcing the side slope soil body, firstly, the self-stress expansion tree root pile (1) must be arranged, and then, the stress mode is checked according to the arrangement condition, and the internal force and the external force are calculated and analyzed; the internal force calculation formula is as follows:
wherein: f R The tension applied to each root pile is expressed by kN; p is resistance which needs to be increased for avoiding arc sliding and is expressed in kN/m; s 1 The number of the tree root piles in unit width of 1 m; beta is an included angle between the root pile and the vertical direction; alpha is an included angle between the acting direction of the sliding force and the horizontal line; f is the expansion friction coefficient of the pile body of the variable cross-section tree root pile;
step three, drilling: adopting a sleeve following method, wherein the rotating speed of a drilling machine is 200-220 r/min, the hydraulic pressure is 1.5-2.5 MPa, the pressure of matched water supply is 0.1-0.3 MPa, the hole is required to be cleaned after the hole is drilled to the designed elevation, and the size of the water supply pressure is controlled until clean water flows out from one hole opening;
step four, hoisting the steel bars and the grouting pipes: the steel bars with the rigid restraint plates (3) are hung as much as possible once, so that the hole wall is prevented from being influenced, the grouting pipes are seamless iron pipes, and the joints are internally contracted, so that the outer pipe wall is smooth and is convenient to pull out;
step five, grouting the pile body in sections: two machines are used for grouting, one machine is used for grouting ordinary cement slurry (16), the other machine is used for grouting self-stress expansion cement slurry (4), the lifting lengths of two grouting pipes are calculated during grouting so as to distinguish grouting slurry of adjacent sections, the grouting pressure is controlled well, so that the grouting pipes can be pulled out along with grouting in the grouting process when the slurry uniformly rises, and the grouting pipes are buried in the cement slurry for 2-3 m so as to ensure the slurry quality;
step six, laying a film bag: reserving corresponding mounting holes on the geomembrane bag (5) according to the arrangement interval of the self-stress expansion tree root piles (1), and then laying the geomembrane bag (5) on the surface of the side slope from top to bottom so that the reserved holes on the geomembrane bag (5) are aligned with the tree root piles;
seventhly, grouting the bottom surface of the film bag: after the membrane bag is laid, pouring the mixed cement slurry into the first membrane bag;
step eight, filling the surface layer of the film bag with the vegetation humus: and after the cement slurry at the bottom layer is initially set, the vegetation saprophyte on the surface layer of the film bag is filled, and when congestion occurs during filling, the vegetation saprophyte is dredged in a foot-operated extrusion mode.
2. The construction method of the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure according to claim 1, is characterized in that: install steel panel (8) between solid fixed pedestal (2) and geomembrane bag (5), the lower surface of solid fixed pedestal (2) sets up a bearing plate (10), avoids fixation nut (9) and geomembrane bag (5) contact surface too little and destroys membrane bag concrete to the pulling force that the homodisperse comes from the stock.
3. The construction method of the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure according to claim 1, is characterized in that: the vegetation humus filler is composed of plant seeds, humus soil, clay, sandy soil, cement and water, and the composition proportion of the vegetation humus filler is 1:1:1:1.5:2.5:3 mixing the mixture.
4. The construction method of the variable cross-section root pile and film bag concrete combined drainage greening slope protection structure according to claim 1, is characterized in that: the membrane bag surface layer (13) is woven by coarse linen, fine air-permeable holes (14) are formed in the surface, and in addition, the surface coarse linen is also provided with holes with the diameter of 0.5-1 cm so as to increase the emergence rate of vegetation.
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Effective date of registration: 20240731 Address after: 230000 b-1018, Woye Garden commercial office building, 81 Ganquan Road, Shushan District, Hefei City, Anhui Province Patentee after: HEFEI WISDOM DRAGON MACHINERY DESIGN Co.,Ltd. Country or region after: China Address before: 443002 No. 8, University Road, Xiling District, Yichang, Hubei Patentee before: CHINA THREE GORGES University Country or region before: China |