CN114606940A - Soil nailing wall ecological frame protection structure at soil adverse side slope and construction process thereof - Google Patents
Soil nailing wall ecological frame protection structure at soil adverse side slope and construction process thereof Download PDFInfo
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- CN114606940A CN114606940A CN202210321613.XA CN202210321613A CN114606940A CN 114606940 A CN114606940 A CN 114606940A CN 202210321613 A CN202210321613 A CN 202210321613A CN 114606940 A CN114606940 A CN 114606940A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
- A01G9/02—Receptacles, e.g. flower-pots or boxes; Glasses for cultivating flowers
- A01G9/022—Pots for vertical horticulture
- A01G9/025—Containers and elements for greening walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0266—Retaining or protecting walls characterised by constructional features made up of preformed elements
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Abstract
The invention provides an ecological frame protection structure of a soil nailing wall at a slope with unfavorable soil texture and a construction process thereof, relates to the technical field of geotechnical engineering, and solves the problems of strength and stability of the slope with unfavorable soil texture in the prior art. The invention can avoid the cost increase caused by rework caused by slope instability in the later period, and can achieve the effects of durability, environmental protection, safety and economy.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a soil nailing wall ecological frame protection structure at a soil adverse side slope and a construction process thereof.
Background
A Soil Nail Wall (Soil Nail Wall) is an in-situ Soil body reinforcement technology, a foundation pit side slope is reinforced through Soil nails made of reinforcing steel bars, a reinforcing mesh is laid on the surface of the side slope, and then a concrete surface layer is sprayed on the surface of the side slope, so that the side slope reinforced support construction method is combined with a Soil side slope. The construction is a complex formed by firmly bonding a reinforced rod piece (namely a soil nail or an anchor rod) arranged in a slope body with the surrounding soil body, and a supporting structure similar to a gravity retaining wall formed by surface layers. The ladder-shaped ecological frame is a slope protection technology for supporting a slope or a side slope by basic knowledge of subjects such as comprehensive engineering mechanics, soil science, ecology, phytology and the like to form a comprehensive slope protection system consisting of plants or engineering and plants. When the slope is subjected to silt, loess and weakly cemented sandy soil, the conventional common engineering protection and framework vegetation protection are not enough to maintain the stability of the slope, and the slope collapse or landslide not only can cause adverse effects on the use function of the road, but also can cause economic loss due to secondary construction of slope protection.
Disclosure of Invention
The invention aims to design a soil nailing wall ecological frame protection structure at a side slope with unfavorable soil texture and a construction process thereof, and the soil nailing wall ecological frame is used for replacing skeleton vegetation protection, so that the problems of strength and stability of the side slope with unfavorable soil texture can be successfully solved, the cost increase caused by rework due to side slope instability in the later period can be avoided, and the effects of durability, environmental protection, safety and economy can be achieved.
The invention is realized by the following technical scheme:
unfavorable side slope department of soil property soil nail wall ecological frame protective structure, including side slope, soil nail wall, notch cuttype ecological frame layer and planting afforestation structure, the domatic of side slope is provided with soil nail wall, soil nail wall surface mounting is provided with notch cuttype ecological frame layer, notch cuttype ecological frame layer is provided with plants afforestation structure.
When the structure is arranged, the soil nailing wall ecological frame replaces traditional skeleton vegetation protection, the strength and stability problems of the soil-property unfavorable side slope can be successfully solved, rework increasing cost caused by later-stage rework is avoided, and the effects of durability, environmental protection, safety and economy can be achieved.
In order to further better implement the invention, the following arrangement structure is particularly adopted: the soil nailing wall comprises soil nails, a concrete primary spraying layer, a steel bar net piece and a concrete surface layer;
the concrete primary spraying layer is arranged on the slope surface of the side slope, and a reinforcing mesh formed by splicing a plurality of reinforcing mesh pieces is laid on the surface of the concrete primary spraying layer; the side slope is provided with a plurality of soil nail holes which are inclined and extend downwards from the surface of the concrete primary spraying layer to the interior of the soil body, one soil nail is inserted into each soil nail hole, the extending ends of the soil nails are connected with the wall of each soil nail hole through cement paste, and the extending ends of the soil nails are fixedly connected with the reinforcing mesh;
the concrete surface layer covering the reinforcing mesh and the extending end of the soil nail is arranged on the surface of the concrete primary spraying layer.
In order to further better implement the invention, the following arrangement structure is particularly adopted: and the extending end of the soil nail is provided with an elbow bent towards the outer side surface of the reinforcing mesh, and the elbow is fixedly connected with the reinforcing mesh.
Further: the elbow is 25cm long.
In order to further better implement the invention, the following arrangement structure is particularly adopted: the inclination angle design angle of the soil nail holes and the horizontal plane is 15 degrees.
Further: the allowable deviation of the inclination angle of the soil nail hole is 3 degrees.
In order to further better implement the invention, the following arrangement structure is particularly adopted: the thickness of the protective layer of the reinforcing mesh is not less than 20 cm.
In order to further better implement the invention, the following arrangement structure is particularly adopted: soil nail stretches into fixedly connected with along its pole length direction according to the preface equidistance many sets of location bracket that set up on the pole section in soil nail hole, location bracket includes around soil nail circumference is according to the preface equal angular distribution's three C shape reinforcing bar bracket.
In order to further better implement the invention, the following arrangement structure is particularly adopted: the distance between two adjacent positioning brackets is 2 m.
In order to further better implement the invention, the following arrangement structure is particularly adopted: and the outer surface of the reinforcing mesh is fixedly connected with a diagonal reinforcing rib.
The invention also provides a construction process of the ecological frame protection structure of the soil nailing wall at the soil adverse side slope, which is used for constructing the ecological frame protection structure of the soil nailing wall at the soil adverse side slope and comprises the following steps:
s1, slope finishing: trimming the side slope, cleaning up to ensure that the slope of the side slope meets the design requirement and the slope surface is smooth;
s2, primary spraying: after finishing the slope, immediately spraying concrete to solidify the surface to form a concrete primary spraying layer;
s3, drilling: after the primary spraying is finished and the strength of the concrete primary spraying layer reaches 70%, drilling to form a soil nail hole;
s4, mounting soil nails: after drilling is finished, correspondingly inserting a soil nail into a soil nail hole to ensure that the soil nail rod body is located at the center of the soil nail hole;
s5, grouting: after the soil nails are installed, cement paste is injected into the soil nail holes immediately;
s6, hanging a net: after grouting is finished, after the strength of cement paste reaches 50% of the designed strength, hanging a steel bar net piece, and enabling the steel bar net piece to be tightly attached to a concrete primary spraying layer on the slope surface of the slope and fixedly connected with the extending end of the soil nail;
s7, secondary spraying of concrete: after the net is hung, performing second concrete spraying construction, wherein the thickness of the sprayed concrete and the protective layer meet the design requirements, and the sprayed concrete is cured in time after final setting to form a concrete surface layer, wherein the curing time is determined according to the temperature and humidity condition during construction;
s8, installing a stepped ecological frame: after the secondary concrete spraying is finished, installing and positioning the stepped ecological frame according to the design slope ratio of the drawing and the corresponding positioning holes to form a stepped ecological frame layer;
s9, backfilling planting soil and greening: and backfilling soil into the stepped ecological frame, and planting vegetation in the backfilled soil.
Further, the invention is realized better: in the step S3, the aperture of the soil nail is phi 120mm, water-carrying operation is avoided during drilling, the soil nail hole is prevented from being blocked by waste residues, and the waste residues are extruded by adopting air drill high-pressure air after drilling is finished;
in step S4, inserting a soil nail into the soil nail hole and simultaneously inserting a grouting pipe and an exhaust pipe;
in step S5, during grouting, the grouting pipe opening should be always embedded in the cement slurry, the distance between the exhaust pipe and the grouting pipe is 120cm, the grouting pipe and the exhaust pipe should be simultaneously drawn outwards, the air displacement of the exhaust pipe should be grasped slowly during drawing, and grouting discontinuity is strictly prohibited when the pipe is drawn quickly.
The invention has the following advantages and beneficial effects:
according to the invention, the soil nailing wall makes up the deficiency of the strength of the soil body, the overall rigidity and stability of the slope body are greatly improved, the stepped ecological frame layer protects and reinforces the surface layer of the side slope by planting plants and utilizing the interaction (root anchoring effect) of the plants with the rock and the soil body, so that the requirements on the stability of the surface layer of the side slope can be met, the slope protection of the damaged natural ecological environment can be recovered, the ecological frame of the soil nailing wall replaces the traditional framework vegetation protection, the strength and stability problems of the side slope with unfavorable soil quality can be successfully solved, the problem of rework increase in cost caused by later reworking is avoided, and the effects of durability, environmental protection, safety and economy can be achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a view of a soil nail arrangement;
FIG. 2 is a flat view of a rebar grid;
FIG. 3 is a schematic diagram of a ladder-type ecological frame arrangement;
FIG. 4 is a detailed view of the top of the soil nail;
FIG. 5 is a schematic structural view of the soil nail;
FIG. 6 is an axial view of the soil nail;
FIG. 7 is a schematic structural view of a C-shaped reinforcement bracket;
FIG. 8 is a connection diagram of soil nails, reinforcing mesh sheets and concrete surface layers;
labeled as:
1. side slope; 02. soil nailing walls; 2. soil nailing; 21. bending the pipe; 3. a concrete primary spraying layer; 4. reinforcing mesh sheets; 5. a concrete facing; 6. cement slurry; 7. a positioning bracket; 71. a C-shaped reinforcing steel bracket; 8. a diagonal reinforcing rib; 9. step-type ecological frame.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
Example 1:
the ecological frame protective structure of soil nail wall of unfavorable side slope department of soil property avoids the later stage because of the cost increase that the rework that the side slope unstability leads to caused, can reach durable, environmental protection, safety, economic effect again, as shown in fig. 1-8, sets up to following structure in particular:
this unfavorable slope department of soil property soil nail wall ecological frame protective structure of soil is for combining the artifical transformation facility that the natural slope body goes on, including side slope 1, soil nail wall, notch cuttype ecological frame layer and planting greening structure, soil nail wall need combine the geology condition to design, for example adopt pore-forming slip casting type reinforcing bar soil nail wall.
In this embodiment, the height of the side slope 1 is about 12m, and the side slope is divided into two levels, and each level is 6m high. The soil nailing wall adopts a pore-forming grouting type reinforced soil nailing wall. Wholly see, slope surface of side slope 1 is provided with soil nail wall 02, and soil nail wall 02 surface mounting is provided with the notch cuttype ecological frame layer of constituteing by a plurality of prefabricated notch cuttype ecological frame 9, and notch cuttype ecological frame layer is provided with plants afforestation structure.
In this embodiment, soil nail wall has compensatied the not enough of soil body self intensity, the bulk rigidity and the stability of the slope body have been improved greatly, notch cuttype ecological frame layer is through planting the plant, utilize plant and rock, the interact (root anchoring effect) of the soil body protects slope 1 top layer, consolidate, it can satisfy the requirement to the slope top layer stability to make it, can resume the slope protection of destroyed natural ecological environment again, replace traditional skeleton vegetation protection with soil nail wall ecological frame, can successfully solve the intensity and the stability problem of the unfavorable side slope of soil property, avoid later stage rework to cause rework increase cost, can reach durable, environmental protection, safety, economic effect again.
Specifically, the soil nailing wall comprises soil nails 2, a concrete primary spraying layer 3, a reinforcing mesh 4 and a concrete surface layer 5.
The soil nail 2 adopts HRB400 and phi 25 three-level steel bars, and rust removal, oil stain removal and rod body bending prevention are needed during rod body manufacturing and installation. Preferably, in order to ensure that the soil nail 2 is centered in the soil nail hole when being inserted into the soil nail hole, and the normal progress of the slip casting of being convenient for simultaneously, on the pole section of soil nail 2, along body of rod length direction, every 2 m's distance welded fastening one set of locating bracket 7, locating bracket 7 includes around 2 circumference of soil nail according to the preface three C shape reinforcing bar brackets 71 that the angle distributes.
The side slope 1 needs to be finished in advance, and in order to prevent the finished side slope 1 from collapsing, a layer of concrete primary spraying layer 3 needs to be sprayed on the slope surface of the side slope 1 after finishing, so that the surface of the side slope 1 is solidified.
A reinforcing mesh consisting of a plurality of 15 x 15cm phi 8 reinforcing mesh sheets 4 is laid on the surface of the concrete primary-spraying layer 3, and preferably, the reinforcing mesh consisting of a plurality of diagonal reinforcing ribs 8 is firmly welded on the outer surface of the reinforcing mesh sheets 4.
A plurality of soil nail holes with the diameter of 120mm, which are inclined downwards from the surface of a concrete primary spraying layer 3 to the inside of a soil body, are drilled on the slope surface of the side slope 1 according to design hole positions, and the inclination angle design angle between each soil nail hole and the horizontal plane is 15 degrees, wherein the allowable deviation of the inclination angle is 3 degrees, namely the inclination angle between each soil nail hole and the horizontal plane is 12-18 degrees.
Every soil nailing hole is downthehole to insert and is equipped with a soil nail 2, and the end of stretching into of soil nail 2 makes it to be located soil nailing hole central point through locating bracket 7 and the contact of soil nailing hole pore wall and puts, and the end of stretching into of soil nail 2 is connected with soil nailing hole pore wall through grout 6 to filling in the soil nailing hole, and the end that stretches out of soil nail 2 and reinforcing bar net piece 4 fixed connection.
The surface of the concrete primary spraying layer 3 is sprayed with a concrete surface layer 5, the concrete surface layer 5 covers the reinforcing mesh 4, the inclined-pulling reinforcing ribs 8 and the extending ends of the soil nails 2, the thickness and the protective layer of the concrete primary spraying layer 3 meet the design requirements, and the thickness of the protective layer of the reinforcing mesh 4 is not less than 20 cm.
Preferably, the extending end of the soil nail 2 is provided with an elbow 21 bent towards the outer side surface of the steel mesh 4, the length of the elbow 21 is 25cm, and the elbow 21 and the steel mesh 4 are welded and fixed.
The surface mounting of concrete surface course 5 is provided with the notch cuttype ecological frame layer that a plurality of notch cuttype ecological frames 9 are constituteed, and it has soil to backfill in every notch cuttype ecological frame 9, plants in the soil to have the vegetation. The bottom of the ladder-shaped ecological frame 9 on the lowest layer is arranged on a concrete foundation, and the top of the ladder-shaped ecological frame 9 on the uppermost layer is flush with the top of the side slope 1.
Example 2:
the embodiment provides a construction process on the basis of the above embodiment, and particularly adopts the following arrangement structure:
in this embodiment, the construction process is performed on the soil nailing wall ecological frame protection structure at the soil adverse side slope in the above embodiment, and specifically includes the following steps:
step S1, slope finishing: and (3) finishing the side slope 1 by adopting a manual matching machine, and cleaning the slope surface of the side slope 1 to ensure that the slope of the side slope 1 meets the design requirement and the slope surface is smooth.
Step S2, primary spraying: after finishing the side slope, in order to prevent the finished side slope 1 from collapsing, concrete spraying is required to be immediately carried out, so that the surface of the side slope 1 is solidified, and a concrete primary spraying layer 3 is formed through primary spraying.
Step S3, drilling: after the primary spraying is finished, after the strength of the concrete primary spraying layer 3 reaches 70%, drilling operation is carried out to form soil nail holes, the hole diameter of each soil nail is phi 120mm, the drilling depth and the drilling angle need to meet the design requirements, the allowable deviation of the hole positions of the drilled holes needs to be 50mm, the allowable deviation of the dip angles of the drilled holes is 3 degrees, water-carrying operation is avoided during drilling, the holes are prevented from being blocked by waste residues, and the waste residues are extruded out by adopting air drill high-pressure air after the drilling is finished.
Step S4, installing soil nails: after drilling is accomplished, every 2m welds one set of locating bracket 7 on the soil nail, ensures that the 2 body of rod of soil nail is at soil nail hole punchhole center, and the slip casting of being convenient for goes on normally simultaneously, and the soil nail 2 that will a length be not less than design length corresponds inserts a soil nail hole in, inserts slip casting pipe and blast pipe when inserting soil nail 2 in the soil nail hole punchhole.
Step S5, grouting: and immediately injecting cement slurry 6 into the soil nail hole after the soil nail is installed, wherein the cement slurry 6 can be cement paste or cement mortar. During grouting, a grouting pipe opening is always embedded into 6 grout of the grout, the distance from the end part of the grouting pipe to the bottom of a soil nail hole is not more than 200mm, an exhaust pipe is 120cm away from the grouting pipe, the grouting pipe and the exhaust pipe are simultaneously drawn outwards, the exhaust amount of the exhaust pipe is slowly controlled at any time during drawing, grouting discontinuity is strictly prevented from occurring in the quick drawing pipe, grouting is stopped after the grout overflows from the soil nail hole opening, and opening grouting is performed when the grout level descends after grouting.
Step S6, hanging the net: after grouting is finished, after the strength of the cement paste 6 reaches 50% of the designed strength, hanging a 15 multiplied by 15cm steel bar net piece 4 with the diameter of 8, and enabling the steel bar net piece 4 to be tightly attached to the concrete primary spraying layer 3 on the slope surface of the side slope 1 and fixedly welded with the extending end elbow 21 of the soil nail 2.
Step S7, secondary shotcrete: and after the net is hung, performing second concrete spraying construction, wherein the thickness of the sprayed concrete and the protective layer meet the design requirements, and the sprayed concrete is cured in time to form a concrete surface layer 5.
Step S8, installing a stepped ecological frame: after the secondary concrete spraying is finished, the step-shaped ecological frame is installed and positioned by adopting the finished product prefabricated ecological frame component according to the design slope ratio of the drawing and the corresponding positioning holes to form a step-shaped ecological frame layer.
Step S9, backfilling planting soil and greening: and backfilling soil into the stepped ecological frame, and planting vegetation in the backfilled soil.
Wherein, in the steps S2 and S7, when the concrete is sprayed, the spray head and the sprayed surface should be kept vertical, the distance is preferably 0.6-1.0m, the spraying operation should be carried out in sections, the spraying sequence in the same section should be from bottom to top, the spraying thickness is not less than 40mm, after the sprayed concrete is finally set for 2 hours, the water spraying maintenance is carried out, and the maintenance time is determined according to the air humidity.
In this embodiment, soil nail wall has compensatied the not enough of soil body self intensity, the bulk rigidity and the stability of the slope body have been improved greatly, notch cuttype ecological frame layer is through planting the plant, utilize plant and rock, the interact (root anchoring effect) of the soil body protects slope 1 top layer, consolidate, it can satisfy the requirement to the slope top layer stability to make it, can resume the slope protection of destroyed natural ecological environment again, replace traditional skeleton vegetation protection with soil nail wall ecological frame, can successfully solve the intensity and the stability problem of the unfavorable side slope of soil property, avoid later stage rework to cause rework increase cost, can reach durable, environmental protection, safety, economic effect again.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. Ecological frame protective structure of soil nail wall of unfavorable side slope of soil property department, its characterized in that: including side slope (1), soil nail wall, notch cuttype ecological frame layer and planting greening structure, the domatic being provided with of side slope (1) soil nail wall, soil nail wall surface mounting is provided with notch cuttype ecological frame layer, notch cuttype ecological frame layer is provided with planting greening structure.
2. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 1, characterized in that: the soil nailing wall comprises soil nails (2), a concrete primary spraying layer (3), a steel bar net piece (4) and a concrete surface layer (5);
the concrete primary spraying layer (3) is arranged on the slope surface of the side slope (1), and a reinforcing mesh formed by splicing a plurality of reinforcing mesh sheets (4) is laid on the surface of the concrete primary spraying layer (3); the side slope (1) is provided with a plurality of soil nail holes which obliquely extend downwards into the soil body from the surface of the concrete primary spraying layer (3), one soil nail (2) is inserted into each soil nail hole, the extending ends of the soil nails (2) are connected with the wall of each soil nail hole through cement paste (6), and the extending ends of the soil nails (2) are fixedly connected with the reinforcing mesh (4);
the concrete surface layer (5) covering the reinforcing mesh (4) and the extending end of the soil nail (2) is arranged on the surface of the concrete primary spraying layer (3).
3. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 2, characterized in that: the extension end of the soil nail (2) is provided with an elbow (21) which bends towards the outer side surface of the steel bar net piece (4), and the elbow (21) is fixedly connected with the steel bar net piece (4).
4. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 2, characterized in that: the inclination angle design angle of the soil nail holes and the horizontal plane is 15 degrees.
5. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 2, characterized in that: the thickness of the protective layer of the steel bar mesh (4) is not less than 20 cm.
6. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 2, characterized in that: soil nail (2) stretch into many sets of location bracket (7) that fixedly connected with set up according to the preface equidistance along its pole length direction on the pole section in soil nail hole, location bracket (7) are including winding soil nail (2) circumference is according to the preface three C shape steel bar bracket (71) that the angular distribution such as.
7. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 6, characterized in that: the distance between two adjacent positioning brackets (7) is 2 m.
8. The ecological frame protective structure of soil nail wall at the unfavorable side slope of soil property of claim 2, characterized in that: and the outer surface of the reinforcing mesh (4) is fixedly connected with a diagonal reinforcing rib (8).
9. The construction process of the ecological frame protection structure of the soil nailing wall at the soil adverse side slope is characterized in that the construction process of the ecological frame protection structure of the soil nailing wall at the soil adverse side slope according to any one of claims 1 to 8 comprises the following steps:
s1, slope finishing: trimming the side slope (1), cleaning up to ensure that the slope of the side slope (1) meets the design requirement and the slope surface is flat and smooth;
s2, primary spraying: after finishing the slope, immediately spraying concrete to solidify the surface to form a concrete primary spraying layer (3);
s3, drilling: after the primary spraying is finished, after the strength of the concrete primary spraying layer (3) reaches 70%, drilling to form a soil nail hole;
s4, mounting soil nails: after drilling is finished, a soil nail (2) is correspondingly inserted into a soil nail hole, and a rod body of the soil nail (2) is ensured to be located at the center of the soil nail hole;
s5, grouting: after the soil nails are installed, cement paste (6) is injected into the soil nail holes immediately;
s6, hanging a net: after grouting is finished, after the strength of the cement paste (6) reaches 50% of the designed strength, hanging the reinforcing mesh (4), and enabling the reinforcing mesh (4) to be tightly attached to the concrete primary spraying layer (3) on the slope surface of the side slope (1) and fixedly connected with the extending end of the soil nail (2);
s7, secondary spraying of concrete: after the net is hung, performing second concrete spraying construction, wherein the thickness of sprayed concrete and the protective layer meet the design requirements, and the sprayed concrete is cured in time after final setting to form a concrete surface layer (5);
s8, installing a stepped ecological frame: after the secondary concrete spraying is finished, the stepped ecological frame (9) is installed and positioned according to the design slope ratio of a drawing and the corresponding positioning holes to form a stepped ecological frame layer;
s9, backfilling planting soil and greening: and backfilling soil into the stepped ecological frame, and planting vegetation in the backfilled soil.
10. The construction process of the ecological frame protection structure of the soil nailing wall at the soil property unfavorable slope according to claim 9, characterized in that: in the step S3, the aperture of the soil nail is phi 120mm, water-carrying operation is avoided during drilling, the soil nail hole is prevented from being blocked by waste residues, and the waste residues are extruded by air drill high-pressure air after drilling is finished;
in step S4, inserting the soil nails (2) into the soil nail holes and simultaneously inserting the grouting pipes and the exhaust pipes;
in step S5, during grouting, the grouting pipe opening should be always embedded in the grout (6), the distance between the exhaust pipe and the grouting pipe is 100-120cm, the grouting pipe and the exhaust pipe should be simultaneously drawn outwards, the drawing needs to be slow, the exhaust amount of the exhaust pipe should be grasped at any time, and the quick drawing of the pipe is strictly forbidden to cause grouting discontinuity.
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| CN205591235U (en) * | 2016-04-11 | 2016-09-21 | 广东水电二局股份有限公司 | Soil nailing wall supporting structure |
| CN111119195A (en) * | 2019-12-31 | 2020-05-08 | 中国能源建设集团东北电力第一工程有限公司 | Foundation pit soil nail shotcrete support construction method |
| CN111519639A (en) * | 2020-04-30 | 2020-08-11 | 上海祥阳水利勘测设计有限公司 | Ecological side slope protective structure |
-
2022
- 2022-03-30 CN CN202210321613.XA patent/CN114606940A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040097052A (en) * | 2004-10-21 | 2004-11-17 | 주식회사 오륙개발 | A method for construction an artificial wall using a soil nail and the artificial wall constructed threrby |
| CN205591235U (en) * | 2016-04-11 | 2016-09-21 | 广东水电二局股份有限公司 | Soil nailing wall supporting structure |
| CN111119195A (en) * | 2019-12-31 | 2020-05-08 | 中国能源建设集团东北电力第一工程有限公司 | Foundation pit soil nail shotcrete support construction method |
| CN111519639A (en) * | 2020-04-30 | 2020-08-11 | 上海祥阳水利勘测设计有限公司 | Ecological side slope protective structure |
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