CN111501796B - High embankment slope stabilizing structure and construction method - Google Patents

High embankment slope stabilizing structure and construction method Download PDF

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Publication number
CN111501796B
CN111501796B CN202010363685.1A CN202010363685A CN111501796B CN 111501796 B CN111501796 B CN 111501796B CN 202010363685 A CN202010363685 A CN 202010363685A CN 111501796 B CN111501796 B CN 111501796B
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steel pipe
steel
embankment
grouting
pile
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CN111501796A (en
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蒋吉清
吴熙
齐永洁
周联英
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Zhejiang University City College ZUCC
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Zhejiang University City College ZUCC
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • E02D17/207Securing of slopes or inclines with means incorporating sheet piles or piles
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/02Retaining or protecting walls
    • E02D29/0258Retaining or protecting walls characterised by constructional features
    • E02D29/0275Retaining or protecting walls characterised by constructional features cast in situ
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02Improving by compacting
    • E02D3/10Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/24Prefabricated piles
    • E02D5/28Prefabricated piles made of steel or other metals
    • E02D5/285Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74Means for anchoring structural elements or bulkheads

Abstract

The invention discloses a high embankment side slope stabilizing structure, which comprises: retaining walls, steel pipe piles and anchor rods; the high embankment toe department sets up retaining wall, the retaining wall internal surface sets up steel pipe concrete pile, fills and digs interface department and sets up excavation step and rubble drainage zone, the rubble drainage zone is passed to the bottom of steel pipe concrete pile and steel pipe pile, and the upper segment cover of steel pipe pile has the slip casting sleeve pipe, and slip casting sleeve pipe lower extreme to rubble drainage zone, upper end pass through slip casting union coupling slip casting mouth, inside fixed pulley and the pipeline passageway of setting up of steel pipe concrete pile, the stock is fixed in the rock stratum behind the excavation step, and the exposed part in top connects the steel strand wires, and the steel strand wires are connected on the fixed pulley or the steel pipe pile of eminence department, and the steel strand wires of connecting on the fixed pulley draw forth the crown beam through the pipeline passageway, connect steel. The method is suitable for reinforcing and actively controlling the deformation of the embankment in the embankment construction and operation processes, and is particularly suitable for embankment engineering with high embankment stability and later-period operation safety requirements.

Description

High embankment slope stabilizing structure and construction method
Technical Field
The invention belongs to the technical field of roadbed engineering reinforcement and protection, and particularly relates to a high embankment slope stabilizing structure and a construction method, which are suitable for reinforcement and active control of embankment deformation in embankment construction and operation processes, and are particularly suitable for embankment engineering with higher embankment stability and later-period operation safety requirements.
Background
The semi-filled and semi-excavated highway embankment is a common construction form in the process of constructing roads in mountainous areas, and as embankment filling materials and mountain slope rock soil have great difference in mechanical properties, the filling and excavating interface is easy to slip to cause safety accidents such as embankment collapse and the like, and certain measures are needed for reinforcement in engineering.
Common reinforcement measures at present comprise slope treatment, retaining wall support, step excavation, anti-slide pile arrangement and the like. The slope-releasing treatment needs to occupy a large amount of land resources in high embankment engineering, destroys the original ecological environment, and cannot realize large-area slope-releasing treatment in most mountain areas; the retaining wall support is generally built at the toe of an embankment, can bear larger lateral soil pressure and increase the drainage difficulty, in order to meet the safety requirement, the retaining wall is often required to be very thick and high or the internal reinforcement rate is increased, the construction cost is higher, the construction is limited by the height and the filling amount of the embankment, and the retaining wall support is not suitable for the high embankment and large filling amount of engineering; the step excavation at the filling and excavating interface is a relatively simple anti-slip measure, but the reinforcing effect is limited, and the step excavation is often used as an auxiliary measure or matched with other reinforcing measures; the simple slide-resistant pile is of a cantilever beam type structure, the stress effect is not good, the diameter of a pile body is increased to ensure the effect, the reinforcement ratio is increased, and the cost is high. In addition, the safety requirement in the construction process is mainly considered in the existing reinforcement measures, and sufficient measures are not left to solve the problems of soil displacement and landslide possibly existing after highway operation.
In summary, the conventional anti-sliding reinforcement technology for the high embankment in mountainside mainly has the problems of poor reinforcement effect, large limitation by site conditions, difficult drainage, high construction cost, single reinforcement means, difficult control of later-stage operation safety and the like, and an improvement technology is urgently needed to solve the problems.
Disclosure of Invention
The invention aims to provide a high embankment side slope stabilizing structure and a construction method, and aims to solve the problems that the existing anti-sliding reinforcement technology for the high embankment in mountainside has poor reinforcement effect, is greatly limited by site conditions, is difficult to drain, has high construction cost, is single in reinforcement means, is difficult to control in later-period operation safety and the like.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a high embankment slope stabilizing structure, including: retaining walls, steel pipe piles and anchor rods; the retaining wall is arranged at the slope toe of the high embankment, a steel pipe concrete pile is arranged on the inner side surface of the retaining wall, the top of the steel pipe concrete pile is connected with a crown beam, the top surface of the crown beam is flush with the top of the retaining wall, an excavation step is arranged at the interface of an original rock mass and a filling part, the surface of the excavation step, the bottom of the retaining wall and the surface of a embankment base layer are respectively provided with a gravel drainage band, the bottoms of the steel pipe concrete pile and the steel pipe pile penetrate through the gravel drainage band to be fixed in the stabilized rock soil, the surface of the upper section part of the steel pipe pile is sleeved with a grouting sleeve pipe, the grouting sleeve pipe extends to the gravel drainage band, the grouting sleeve pipe is connected with a grouting port through a grouting pipe, the embankment on the gravel drainage band is filled with the embankment to a road surface structure, the grouting port extends out of the road surface structure, a fixed pulley and a, the exposed part at the top is connected with a steel strand, the steel strand is connected to a fixed pulley or a steel pipe pile at an equal height after passing through a gravel drainage belt and embankment filler, the steel strand connected to the fixed pulley is led out of a crown beam through a pipeline channel inside the steel pipe concrete pile, and the steel strand is connected to a corresponding steel strand tensioning device.
Furthermore, slip casting sleeve pipe both sides set up fixed notch along vertical direction symmetry, set up bamboo reinforcement net through fixed notch between the adjacent steel-pipe pile of same row.
Furthermore, the bamboo reinforcing net is of a grid structure, the adopted bamboo strips are subjected to sterilization, insect prevention and corrosion prevention treatment, are rectangular in shape, have the same width as the length of the grouting sleeve, and are fixed between the adjacent steel pipe piles in the same row.
Furthermore, the inner diameter of the grouting sleeve is larger than the outer diameter of the steel pipe pile, an annular gap exists between the grouting sleeve and the steel pipe pile, and annular small holes are formed in the surface of the grouting sleeve and wrapped by a layer of filter cloth.
Furthermore, the steel pipe piles in one row share one set of grouting pipe and grouting port, and different rows are independent.
Furthermore, an anchoring ring is arranged on the exposed part of the top of the anchor rod, and a steel strand is connected to the anchoring ring.
Furthermore, the fixed pulleys are fixed on the fixed pulley rotating shaft, a preset number of fixed pulleys are arranged in a pipeline channel from top to bottom, the diameters of the different fixed pulleys are different, the diameter of the fixed pulley is the smallest, the diameters of the fixed pulleys are sequentially increased downwards, and the interiors of the concrete filled steel tube piles in the rest parts except the pipeline channel are all tightly poured by concrete.
Furthermore, the steel strands are divided into two types, one type is a tension steel strand which is sequentially connected with the anchoring ring, the fixed pulley and the steel strand tension device, the other type is a fixed steel strand which is connected with the anchoring ring and fixed on the steel pipe pile at the farthest end away from the anchoring ring, and the connection direction of the steel strands is perpendicular to the inner side face of the retaining wall.
Furthermore, inclination measuring points and grouting ports are arranged in the central greening dividing strip on the pavement structure and are alternately arranged at equal intervals.
In a second aspect, an embodiment of the present invention further provides a construction method for a high embankment side slope stabilizing structure, including the following steps:
1) substrate treatment and step excavation: cleaning surface vegetation and rock soil at the filling and digging interface, digging the original rock surface into a step shape at a designated position, and leveling and rolling the rock soil on the surface of the embankment base layer to be compact;
2) mounting the fixed pulley: fixing a fixed pulley rotating shaft on the inner layer steel pipe sleeve, installing a fixed pulley, then integrally fixing the small section of steel pipe sleeve at the upper section of the outer layer steel pipe sleeve, reserving a small hole at the position where the fixed pulley is installed, and leading out the steel stranded wire from the top after the steel stranded wire passes through the small hole;
3) and (3) construction of the steel pipe concrete pile: filling a layer of broken stone drainage belt on the leveled and compacted embankment base layer, rolling and compacting, then drilling by using a geological drilling machine, inserting a reinforcement cage with a small top and a big bottom from the bottom of a steel pipe sleeve after drilling, inserting the reinforcement cage into the drilled hole after fixing, controlling the bottom of the steel pipe sleeve to reach the hole bottom, controlling the top to reach the designed elevation, then pouring concrete to form a pile body, repeating the steps to perform the next position after completing the steel pipe concrete pile at one position, starting to perform crown beam construction after completing the whole number of steel pipe concrete piles at the section, building a template, binding the steel bars reserved at the tops of all the steel pipe concrete piles by using transverse steel bars, and pouring concrete to form the crown beam;
4) and (3) construction of the retaining wall: the method comprises the steps of firstly installing templates in a partition mode, pouring concrete in a partition mode after the templates are installed to form a retaining wall structure, exposing steel strand traction holes on one side of a steel pipe concrete pile in the pouring process, and facilitating normal tensioning of steel strands;
5) and (3) construction of the steel pipe pile: according to the buried depth condition of the steel pipe pile, sleeving a grouting sleeve on a part to be buried in an embankment filler and gravel drainage zone, drilling at a specified position by using a geological drilling machine, inserting the steel pipe sleeve into the hole until the bottom of the hole, temporarily fixing an exposed section of the steel pipe sleeve by adopting a support measure, then hoisting a reinforcement cage into the steel pipe sleeve, and pouring concrete inwards to form a pile body;
7) installation of a tensioning system: the anchor rod is arranged at the designated position of the excavation step, the reserved steel strand at one side of the steel pipe concrete pile is pulled and connected to the anchor rod with the corresponding height, the steel pipe pile at one side close to the retaining wall is also connected and fixed by the steel strand, the steel strand is directly bound on the corresponding grouting sleeve, and the steel strand is necessarily in a stretched state during binding due to the fact that the steel strand cannot be stretched in the later period, and the steel strand pulled from the fixed pulley can be stretched and controlled in the later period;
8) installation of a grouting system: after the bottom structure is installed, installing the same set of grouting pipes at the top of the grouting sleeves in the same horizontal row, and arranging grouting ports at the specified height;
9) embankment layered filling and steel strand drawing: after all components are installed, one end of a reserved steel strand led out from the interior of a concrete filled steel tube pile is connected to a steel strand tensioning device, then the reserved steel strand is paved layer by layer in a longitudinal segmentation and horizontal layering filling and rolling mode, when embankment filler is filled to the position of each level of excavation step, firstly, a layer of broken stone drainage belt is paved on the surface of the excavation step by using broken stones, the excavation step is compacted by using an impact rolling mode and then is paved to a normal embankment filler, each level of excavation step is paved in the same mode until the excavation step is designed to be high in elevation, the filling and rolling process needs to be reasonably carried out in a block partitioning mode to prevent the internal reinforcing component from being damaged, and in the filling process, the tensioning stress of the steel strand rises step by step to ensure the stability of a retaining;
10) the arrangement of the inclination measuring points: after the construction of the pavement structure is finished, arranging inclination measuring point positions between two adjacent grouting ports of the central greening partition belt at intervals, and driving an inclination measuring pipe for later use;
11) reinforcing and actively controlling deformation of the road embankment after road operation: after the highway is normally operated, the displacement of an internal soil body is monitored in real time through a preset inclinometer pipe, if the displacement of a certain section exceeds a safety value, preliminary reinforcement can be performed in a mode of increasing the tensile stress of a steel strand, and if deformation cannot be controlled, grouting reinforcement can be further performed to the inside of the embankment through a grouting port arranged in a central greening separation belt, so that early warning and active deformation control on embankment deformation are realized.
The invention has the beneficial effects that:
1) the reinforcing measures are diversified, and the structural stability and safety are ensured
This stable structure has combined retaining wall, steel pipe concrete pile, steel-pipe pile, steel strand wires tensioning equipment, slip casting to carry out the reinforcement and the stability of embankment structure, satisfies higher security requirement. Wherein, the inside steel-pipe pile and the bamboo reinforcement net that sets up of embankment of fill can play and add the muscle reinforcement effect, reduce the landslide risk.
2) The drainage system is perfect, and the risk of ponding collapse is reduced
Drainage system among this stable structure is including laying the hoop space in filling out one deck rubble water drainage zone and the slip casting sleeve pipe of digging interface department, the former is as horizontal drainage body, the latter is as vertical drainage body, the moisture in the fill section packs at first gets into inside the cavity through the hoop aperture on the slip casting sleeve pipe, under the action of gravity, moisture flows to rubble water drainage zone along the slip casting sleeve pipe to along rubble water drainage zone discharge embankment, prevent that ponding from influencing embankment stability.
3) Flexible combination of reinforced structure and environment protection material
The retaining wall is reinforced by tensioning the steel pipe concrete piles and the steel strands, so that the slope releasing range of the high embankment can be greatly reduced, and the building thickness of the retaining wall can be reduced; the upper section of the steel pipe pile is provided with a grouting sleeve which serves as a vertical drainage body in the normal operation stage of a road and is used for draining accumulated water, grouting reinforcement can be performed when the soil body is subjected to overlarge displacement, the steel pipe pile has high structural rigidity and is connected with a filling section and an original rock stratum, a strong shearing action is achieved, and slippage of a filling and digging interface is prevented; in addition, the used bamboo reinforcing net is made of environment-friendly materials, so that the bamboo reinforcing net is low-carbon and environment-friendly.
4) Embankment displacement control under trenchless condition after highway operation
After the highway is operated, under the condition that the road surface is not required to be damaged by excavation, grouting reinforcement and steel strand tensioning reinforcement on the inner soil body can be realized by utilizing the pre-buried grouting port, the grouting pipe and the steel strand, the displacement of the inner soil body of the embankment is effectively controlled, and landslide is prevented. In addition, as the inclination measuring point and the grouting port are both arranged in the central greening dividing strip, the reinforcing process cannot have excessive influence on the normal traffic on the ground.
5) Multiple active control of embankment deformation can be realized by combining with a monitoring system
The embedded inclinometer pipe can monitor soil body displacement, can warn potential landslide risk in the first time, and converts the soil body displacement from original passive control into active control. In addition, when the inclinometer monitors that the soil body is deformed excessively, the first control can be carried out by increasing the tensile stress of the steel strand, if the deformation of the soil body is not controlled, the second grouting reinforcement measure can be continuously adopted, safety redundancy is reserved, and landslide accidents are prevented to the maximum extent.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of a high embankment slope stabilizing structure provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a tensioning system and a grouting system in the middle embankment provided by the embodiment of the invention;
fig. 3 is a schematic view of an internal supporting structure of a middle embankment according to an embodiment of the present invention;
FIG. 4 is a plan view of a grouting system and a monitoring point location arrangement provided in an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a concrete filled steel tubular pile including a fixed pulley segment according to an embodiment of the present invention;
FIG. 6 is a partial detail view of a concrete filled steel tubular pile including a fixed pulley segment according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a steel pipe pile with a grouting sleeve sleeved therein according to an embodiment of the present invention;
FIG. 8 is a partial detailed view of a steel pipe pile with a grouting sleeve sleeved therein according to an embodiment of the present invention;
description of reference numerals: a retaining wall 1; a steel pipe concrete pile 2; a steel pipe pile 3; grouting the casing 4; a fixed pulley 5; a fixed pulley rotating shaft 6; a steel strand tensioning device 7; a steel strand 8; an anchoring ring 9; an anchor rod 10; a circumferential small hole 11; a grouting pipe 12; a grouting port 13; a fixing notch 14; a bamboo reinforcing net 15; a gravel drainage belt 16; excavating a step 17; embankment filler 18; a pavement structure 19; a crown beam 20; a point of inclinometer 21; a central green separator 22.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
As shown in fig. 1 to 8, the present embodiment provides a high embankment slope stabilization structure, including: the retaining wall 1, the steel pipe pile 3 and the anchor rod 10; the retaining wall 1 is arranged at the toe of the high embankment, a steel pipe concrete pile 2 is arranged on the inner side surface of the retaining wall 1, the top of the steel pipe concrete pile 2 is connected with a crown beam 20, the top surface of the crown beam 20 is flush with the top of the retaining wall 1, an excavation step 17 is arranged at the interface of an original rock body and a filling part, a gravel drainage strip 16 is arranged on the surface of the excavation step 17, the bottom of the retaining wall 1 and the surface of an embankment base layer, the steel pipe concrete pile 2 and the bottom of the steel pipe pile 3 penetrate through the gravel drainage strip 16 and are fixed in stable rock soil, a grouting sleeve 4 is sleeved on the surface of the upper section part of the steel pipe pile 3, the grouting sleeve 4 extends to the gravel drainage strip 16, the grouting sleeve 4 is connected with a grouting opening 13 through a grouting pipe 12, embankment fillers 18 are filled on the gravel drainage strip 16 to a road surface structure 19, the grouting opening 13 extends out of the road surface structure 19, a fixed pulley 5 and a, the anchor rod 10 is fixed in a stable rock stratum after a step 17 is excavated, the exposed part at the top is connected with a steel strand 8, the steel strand 8 is connected to a fixed pulley 5 or a steel pipe pile 3 at an equal height after passing through a gravel drainage belt 16 and embankment fillers 18, and the steel strand 8 connected to the fixed pulley 5 is led out of a crown beam 20 through a pipeline channel inside a steel pipe concrete pile 2 and is connected to a corresponding steel strand tensioning device 7.
In the embodiment, the contact surface of the embankment filling section and the original rock soil is provided with excavation steps 17, the width and the height of each excavation step 17 are 1-2 meters, and the step surface is provided with 2% -4% of inward inclined slopes; and a layer of gravel drainage belt 16 is laid on the surface of the excavation step 17, the gravel drainage belt 16 covers the whole embankment and the bottom of the retaining wall 1, and water in the embankment can be drained out of the embankment through the gravel drainage belt 16.
In the embodiment, the steel pipe pile 3 is divided into an upper part and a lower part, the lower part is driven into a stable rock stratum to play a role in fixing, the upper part is positioned in an embankment filler 18 layer and a gravel drainage belt 16, a grouting sleeve 4 is sleeved on the surface of the embankment filler 18 layer, an annular gap is formed between the grouting sleeve 4 and the steel pipe pile 3, the surface of the grouting sleeve 4 is provided with annular small holes 11 at equal intervals and is wrapped with filter cloth to prevent external filler from blocking the annular small holes 11, the section structure of the grouting sleeve 4 can be used as a vertical drainage body in the normal operation process of the highway, water in the embankment can enter annular gaps through the annular small holes 11, then flows to the bottom end of the grouting sleeve 4 under the action of gravity, flows into a gravel drainage belt 16 through the annular small holes 11, and finally is discharged out of the embankment, in addition, the upper section and the lower section of the steel pipe pile are respectively fixed in the embankment filler 18 layer and the stable rock stratum, so that the anti-shearing and anti-sliding effects can be achieved; the top of the grouting sleeve 4 in the same horizontal row is connected to the same grouting opening 13 through the grouting pipe 12, the grouting opening 13 is exposed out of the pavement structure 19 and is arranged in the central greening dividing strip 22, and grouting reinforcement of soil inside the embankment can be achieved under the condition that the pavement is not excavated.
In this embodiment, throw in stock 10 in the stable stratum of excavation step 17 one side, the exposed part in stock 10 top sets up anchor ring 9, anchor ring 9 is used for connecting and fixed steel strand wires 8 one end, steel strand wires 8 divide into two kinds, one kind is for tensioning steel strand wires 8, is connected to the steel strand wires tensioning equipment 7 at retaining wall 1 top through fixed pulley 5 on, another kind is fixed steel strand wires 8, directly ligature plays certain fixed action on the steel-pipe pile 3 of distal end.
As shown in fig. 2, the steel strand 8, the fixed pulley 5, the steel strand tensioning device 7, the anchoring ring 9 and the anchor rod 10 form an interior tensioning system of the embankment, the anchor rod 10 and the anchoring ring 9 are fixed in a stable rock stratum on one side of the excavation step 17 and used for connecting and fixing one end of the steel strand 8, the other end of the steel strand 8 is connected to the fixed pulley 5 or the steel pipe pile 3 at the far end, the steel strand 8 connected to the fixed pulley 5 is a tensioning steel strand 8, and the tensioning steel strand 8 passes through a pipeline channel inside the steel pipe concrete pile 2 after passing through the fixed pulley 5 and is led out of the retaining wall 1 and is finally connected to the steel strand tensioning device 7 at the top of the.
Grouting sleeve 4, slip casting pipe 12 and slip casting mouth 13 constitute the inside slip casting system of embankment and include, wherein slip casting sleeve 4 cover is outside steel-pipe pile 3, buries underground in embankment filler 18 and rubble drainage zone 16, and slip casting pipe 12 one end is connected slip casting sleeve 4, and slip casting mouth 13 is connected to the other end, and the slip casting sleeve of same horizontal row shares one set of slip casting pipe 12 and a slip casting mouth 13, is convenient for carry out local soil body reinforcement in the later stage.
As shown in fig. 3, the reinforcing structure inside the embankment mainly comprises steel pipe piles 3, bamboo reinforcing nets 15, steel pipe concrete piles 2 and retaining walls 1, wherein the bamboo reinforcing nets 15 are woven by bamboo battens and fixed between the steel pipe piles 3 adjacent to each other in the same column, the potential slip directions of the soil bodies in the embankment are perpendicular to each other, grouting in the later stage is matched for reinforcement, a good reinforcement effect can be achieved for the embankment, and the soil bodies inside the embankment are stabilized.
As shown in fig. 4, two steel pipe piles 3 are driven in each horizontal row in the embankment structure, the steel pipe piles 3 in the same horizontal row are connected with a set of grouting pipes 12 and finally connected to the same grouting opening 13, and the grouting opening 13 is exposed out of the ground and positioned in a central greening separation belt 22; bamboo reinforcing nets 15 are connected between adjacent steel pipe piles 3 in the same row, and 3 supporting barriers are formed by the two bamboo reinforcing nets 15 and the retaining wall 1 in the potential slip direction of a soil body; and arranging the inclination measuring points 21 between the adjacent grouting openings 13 at intervals for monitoring the soil displacement condition at the position, and when the inclination measuring points 21 at a certain position are found to have the condition of overlarge soil displacement, grouting the grouting openings 13 at the adjacent regions to reinforce the soil.
As shown in fig. 5, a pipeline channel is reserved on the upper section of the concrete-filled steel tube pile 2, a fixed pulley rotating shaft 6 is welded at a designated position for fixing the fixed pulley 5, and a small hole is reserved on the concrete-filled steel tube pile 2 on one side of the fixed pulley 5 and used for a steel strand 8 to pass through; the parts except the pipeline channel are all filled with concrete compactly to strengthen the strength of the pile body.
As shown in fig. 6, the top of the steel pipe concrete pile 2 is connected with a crown beam 20, the interior of the crown beam 20 and the interior of the upper section of pile body are provided with communicated pipeline channels, the steel strand 8 is led into the pipeline channels through a small hole at one side of the steel pipe concrete pile 2, is led out of the crown beam 20 after being turned by a fixed pulley 5, and is finally connected and fixed on a steel strand tensioning device 7; because the diameter of the fixed pulley 5 at the upper part is smaller than that of the fixed pulley 5 at the lower part, the steel strands 8 on different fixed pulleys 5 can be staggered with each other, and the influence of winding on tensioning is avoided.
As shown in fig. 7, a grouting sleeve 4 is sleeved outside the steel pipe pile 3, an annular gap is reserved between the grouting sleeve 4 and the grouting sleeve, annular small holes 11 are formed in the surface of the grouting sleeve 4, and fixing notches 14 are formed in two sides of the grouting sleeve and used for fixing a bamboo reinforcing net 15; the steel pipe pile 3 is filled with concrete to reinforce the pile body strength.
As shown in fig. 8, the grouting pipe 12 is connected to the grouting sleeve 4 and is communicated with the annular gap between the grouting sleeve 4 and the steel pipe pile 3, so as to facilitate the later grouting operation; the annular small holes 11 are vertically arranged at equal intervals along the grouting sleeve 4.
The embodiment also provides a construction method of the high embankment side slope stabilizing structure, which comprises the following steps:
1) substrate treatment and step excavation: cleaning surface vegetation and rock soil at a filling and digging interface, digging an original rock surface into a step shape at a designated position, wherein the width and height of an excavation step 17 are 1-2 m, the top step surface is made into an inward inclined slope with the proportion of 2% -4%, and the rock soil at the base part is leveled and rolled compactly;
2) installation of the fixed pulley 5: the steel pipe sleeve is manufactured by steel coil materials, a fixed pulley rotating shaft 6 is welded on the inner layer steel pipe sleeve, a fixed pulley 5 is installed, then the small section of steel pipe sleeve is integrally welded at the upper section of the outer layer steel pipe sleeve, firm welding is ensured, meanwhile, a small hole is reserved at the position where the fixed pulley 5 is installed, a steel strand 8 penetrates through the small hole and is drawn out from the top, enough length is reserved at two ends of the steel strand 8, after the fixed pulley 5 is ensured to normally work, the steel member is subjected to rust prevention treatment, lubricating oil is coated at the position of the fixed pulley 5, and the steel member is placed aside for later use;
3) and (3) construction of the steel pipe concrete pile 2: filling a layer of crushed stone drainage belt 16 with the thickness of 0.5-1 m on the leveled and compacted roadbed bottom layer, carrying out compaction by using an impact compaction mode, then carrying out drilling by using a geological drilling machine, inserting a special reinforcement cage with a small top and a big bottom from the bottom of a steel pipe sleeve after the drilling is finished, inserting the special reinforcement cage into the drilled hole after certain fixation, controlling the bottom of the steel pipe sleeve to reach the hole bottom, the top to reach a designed elevation, then pouring concrete to form a pile body, and being worthy of notice that a certain length of reinforcement is required to be reserved at the pile top part, repeating the steps to perform the next place after completing the steel pipe concrete pile 2 at one place, starting to perform crown beam 20 after completing the whole number of the steel pipe concrete piles 2 at the section, building a template, binding all the reinforcements reserved at the top of the steel pipe concrete pile 2 by using transverse reinforcements, and pouring the concrete to form the crown beam 20;
4) construction of the retaining wall 1: the retaining wall 1 adopts a layered and partitioned pouring method, firstly, the templates are installed in a partitioned mode, concrete is poured in a layered mode to form a retaining wall 1 structure after the templates are installed, and it is necessary to expose the traction holes of the steel strands 8 on one side of the steel pipe concrete pile 2 in the pouring process, so that the steel strands 8 can be conveniently and normally tensioned;
5) construction of the steel pipe pile 3: according to the buried depth condition of the steel pipe pile 3, sleeving a grouting sleeve 4 on a part to be buried in an embankment filler 18 and a gravel drainage belt 16 and wrapping a layer of filter cloth to prevent an external soil body from blocking a small annular hole 11, symmetrically arranging fixing notches 14 at two sides of the grouting sleeve 4, placing aside after the manufacturing is finished, drilling at a specified position by using a geological drilling machine, inserting the steel pipe sleeve into the hole until the bottom of the hole, temporarily fixing by adopting a certain support measure due to the fact that the exposed section of the steel pipe sleeve close to one side of a retaining wall 1 is longer, then hanging a steel reinforcement cage into the steel pipe sleeve, and pouring concrete inwards to form a pile body;
6) installation of bamboo reinforcing net 15: after being sterilized, insect-proof and antiseptic treated, the pre-woven bamboo reinforcing net 15 is vertically installed between two adjacent steel pipe piles 3 in the same column, so that the installation firmness of the bamboo reinforcing net is ensured;
7) installation of a tensioning system: an anchor rod 10 is arranged at a designated position of an excavation step 17, an anchor ring 9 is arranged at the exposed end of the anchor rod 10, then a reserved steel strand 8 at one side of a steel pipe concrete pile 2 is connected to the anchor ring 9 with a corresponding height in a traction manner, the exposed section of the steel pipe pile 3 at one side close to a retaining wall 1 is longer, the steel strand 8 can be similarly adopted for connection and fixation, the steel strand 8 is directly bound on a corresponding grouting sleeve 4, and the steel strand 8 is bound in a straight state due to the fact that tensioning cannot be carried out at a later stage, and the steel strand 8 pulled from a fixed pulley 5 can be subjected to tensioning control at the later stage;
8) installation of a grouting system: after the bottom structure is installed, installing the same set of grouting pipes 12 at the top of the grouting sleeve 4 in the same horizontal row, and arranging grouting ports 13 at the specified height;
9) embankment layered filling and steel strand 8 traction: after all the components are installed, certain protection measures are taken on the surface, one end of a reserved steel strand 8 led out from the interior of the steel pipe concrete pile 2 is connected to a steel strand tensioning device 7, then the reserved steel strand is paved layer by adopting a longitudinal subsection and horizontal layering filling and rolling mode, when the embankment filler 18 is filled to the excavation step 17 of each level, firstly, a layer of gravel drainage belt 16 is paved on the surface of the excavation step 17 by using gravel, the pavement of the normal embankment filler 18 is carried out after the compaction by using an impact rolling way, the excavation step 17 of each level is paved by using the same way until the designed elevation, large rolling equipment is not used in the filling and rolling process, the damage to the internal reinforcing members is reasonably prevented by partitioning and zoning, in the filling process, the tensile stress of the steel strand 8 rises step by step to ensure the stability of the retaining wall 1;
10) the inclinometer position 21 is arranged: after the construction of the pavement structure 19 is finished, arranging inclination measuring point positions 21 between two adjacent grouting holes 13 of the central greening dividing strip 22 at intervals, and driving an inclination measuring pipe for later use;
11) reinforcing and actively controlling deformation of the road embankment after road operation: after the highway is normally operated, the displacement of an internal soil body can be monitored in real time through the preset inclinometer pipe, if the displacement of a certain section exceeds a safety value, the temporary reinforcement can be carried out in a mode of increasing the tensile stress of the steel strand 8, if the deformation cannot be controlled, the grouting reinforcement can be further carried out on the interior of the embankment through the grouting port 13 arranged in the central greening dividing strip 22, and early warning and active deformation control on the deformation of the embankment are achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a high embankment slope stable structure which characterized in that includes: retaining walls, steel pipe piles and anchor rods; the retaining wall is arranged at the slope toe of the high embankment, a steel pipe concrete pile is arranged on the inner side surface of the retaining wall, the top of the steel pipe concrete pile is connected with a crown beam, the top surface of the crown beam is flush with the top of the retaining wall, an excavation step is arranged at the interface of an original rock mass and a filling part, the surface of the excavation step, the bottom of the retaining wall and the surface of a embankment base layer are respectively provided with a gravel drainage band, the bottoms of the steel pipe concrete pile and the steel pipe pile penetrate through the gravel drainage band to be fixed in the stabilized rock soil, the surface of the upper section part of the steel pipe pile is sleeved with a grouting sleeve pipe, the grouting sleeve pipe extends to the gravel drainage band, the grouting sleeve pipe is connected with a grouting port through a grouting pipe, the embankment on the gravel drainage band is filled with the embankment to a road surface structure, the grouting port extends out of the road surface structure, a fixed pulley and a, the exposed part at the top is connected with a steel strand, the steel strand is connected to a fixed pulley or a steel pipe pile at an equal height after passing through a gravel drainage belt and embankment filler, the steel strand connected to the fixed pulley is led out of a crown beam through a pipeline channel inside the steel pipe concrete pile, and the steel strand is connected to a corresponding steel strand tensioning device.
2. The high embankment slope stabilizing structure according to claim 1, wherein fixing notches are symmetrically formed in two sides of the grouting sleeve along the vertical direction, and a bamboo reinforcing net is arranged between adjacent steel pipe piles in the same column through the fixing notches.
3. The high embankment side slope stabilizing structure according to claim 2, wherein the bamboo reinforcing net is of a grid structure, and adopted bamboo strips are subjected to sterilization, insect prevention and corrosion prevention treatment, are rectangular in shape, have the width the same as the length of a grouting sleeve and are fixed between adjacent steel pipe piles in the same row.
4. The high embankment slope stabilizing structure according to claim 1, wherein the inner diameter of the grouting sleeve is larger than the outer diameter of the steel pipe pile, a circumferential gap is formed between the grouting sleeve and the steel pipe pile, a circumferential small hole is formed in the surface of the grouting sleeve, and a layer of filter cloth is wrapped on the surface of the grouting sleeve.
5. The high embankment slope stabilization structure according to claim 1, wherein a set of grouting pipes and grouting ports are shared by steel pipe piles of one row, and different rows are independent of each other.
6. The high embankment slope stabilization structure according to claim 1, wherein an anchor ring is arranged on the exposed part of the top of the anchor rod, and a steel strand is connected to the anchor ring.
7. The high embankment slope stabilizing structure according to claim 1, wherein the fixed pulleys are fixed on fixed pulley rotating shafts, a predetermined number of fixed pulleys are arranged in a pipeline channel in an up-down mode, the fixed pulleys are different in diameter among different fixed pulleys, the fixed pulley with the smallest diameter is arranged at the topmost part, the diameters of the fixed pulleys are sequentially increased in a down-down mode, and the interiors of the concrete filled steel tube piles in the other parts except the pipeline channel are all tightly poured by concrete.
8. The high embankment slope stabilization structure according to claim 1, wherein the steel strands are divided into two types, one type is a tension steel strand, the tension steel strand is sequentially connected with the anchoring ring, the fixed pulley and the steel strand tension device, the other type is a fixed steel strand, the anchoring ring is connected with the steel pipe pile which is farthest away from the anchoring ring, and the connection direction of the steel strands is perpendicular to the inner side surface of the retaining wall.
9. The high embankment slope stabilization structure according to claim 1, wherein inclination measuring points and grouting openings are provided in a central green separation zone on the road surface structure, alternately arranged at equal intervals.
10. A construction method of a high embankment side slope stable structure is characterized by comprising the following steps:
1) substrate treatment and step excavation: cleaning surface vegetation and rock soil at the filling and digging interface, digging the original rock surface into a step shape at a designated position, and leveling and rolling the rock soil on the surface of the embankment base layer to be compact;
2) mounting the fixed pulley: fixing a fixed pulley rotating shaft on the inner layer steel pipe sleeve, installing a fixed pulley, then integrally fixing the small section of steel pipe sleeve at the upper section of the outer layer steel pipe sleeve, reserving a small hole at the position where the fixed pulley is installed, and leading out the steel stranded wire from the top after the steel stranded wire passes through the small hole;
3) and (3) construction of the steel pipe concrete pile: filling a layer of broken stone drainage belt on the leveled and compacted embankment base layer, rolling and compacting, then drilling by using a geological drilling machine, inserting a reinforcement cage with a small top and a big bottom from the bottom of a steel pipe sleeve after drilling, inserting the reinforcement cage into the drilled hole after fixing, controlling the bottom of the steel pipe sleeve to reach the hole bottom, controlling the top to reach the designed elevation, then pouring concrete to form a pile body, repeating the steps to perform the next position after completing the steel pipe concrete pile at one position, starting to perform crown beam construction after completing the whole number of steel pipe concrete piles at the section, building a template, binding the steel bars reserved at the tops of all the steel pipe concrete piles by using transverse steel bars, and pouring concrete to form the crown beam;
4) and (3) construction of the retaining wall: the method comprises the steps of firstly installing templates in a partition mode, pouring concrete in a partition mode after the templates are installed to form a retaining wall structure, exposing steel strand traction holes on one side of a steel pipe concrete pile in the pouring process, and facilitating normal tensioning of steel strands;
5) and (3) construction of the steel pipe pile: according to the buried depth condition of the steel pipe pile, sleeving a grouting sleeve on a part to be buried in an embankment filler and gravel drainage zone, drilling at a specified position by using a geological drilling machine, inserting the steel pipe sleeve into the hole until the bottom of the hole, temporarily fixing an exposed section of the steel pipe sleeve by adopting a support measure, then hoisting a reinforcement cage into the steel pipe sleeve, and pouring concrete inwards to form a pile body;
7) installation of a tensioning system: the anchor rod is arranged at the designated position of the excavation step, the reserved steel strand at one side of the steel pipe concrete pile is pulled and connected to the anchor rod with the corresponding height, the steel pipe pile at one side close to the retaining wall is also connected and fixed by the steel strand, the steel strand is directly bound on the corresponding grouting sleeve, and the steel strand is necessarily in a stretched state during binding due to the fact that the steel strand cannot be stretched in the later period, and the steel strand pulled from the fixed pulley can be stretched and controlled in the later period;
8) installation of a grouting system: after the bottom structure is installed, installing the same set of grouting pipes at the top of the grouting sleeves in the same horizontal row, and arranging grouting ports at the specified height;
9) embankment layered filling and steel strand drawing: after all components are installed, one end of a reserved steel strand led out from the interior of a concrete filled steel tube pile is connected to a steel strand tensioning device, then the reserved steel strand is paved layer by layer in a longitudinal segmentation and horizontal layering filling and rolling mode, when embankment filler is filled to the position of each level of excavation step, firstly, a layer of broken stone drainage belt is paved on the surface of the excavation step by using broken stones, the excavation step is compacted by using an impact rolling mode and then is paved to a normal embankment filler, each level of excavation step is paved in the same mode until the excavation step is designed to be high in elevation, the filling and rolling process needs to be reasonably carried out in a block partitioning mode to prevent the internal reinforcing component from being damaged, and in the filling process, the tensioning stress of the steel strand rises step by step to ensure the stability of a retaining;
10) the arrangement of the inclination measuring points: after the construction of the pavement structure is finished, arranging inclination measuring point positions between two adjacent grouting ports of the central greening partition belt at intervals, and driving an inclination measuring pipe for later use;
11) reinforcing and actively controlling deformation of the road embankment after road operation: after the highway is normally operated, the displacement of an internal soil body is monitored in real time through a preset inclinometer pipe, if the displacement of a certain section exceeds a safety value, the temporary reinforcement is firstly carried out in a mode of increasing the tensile stress of a steel strand, and if the deformation cannot be controlled, grouting reinforcement is further carried out inside the embankment through a grouting opening arranged in a central greening separation belt, so that early warning of embankment deformation and active deformation control are realized.
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CN112411286A (en) * 2020-11-09 2021-02-26 安徽省新路建设工程集团有限责任公司 Active highway embankment grouting reinforcement structure and construction method
CN112501968B (en) * 2020-12-24 2022-03-01 荀敬川 Highway subgrade reinforcing structure and construction method
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