CN111472370B - Slope collapse prevention structure for expressway and construction method thereof - Google Patents
Slope collapse prevention structure for expressway and construction method thereof Download PDFInfo
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- CN111472370B CN111472370B CN202010334584.1A CN202010334584A CN111472370B CN 111472370 B CN111472370 B CN 111472370B CN 202010334584 A CN202010334584 A CN 202010334584A CN 111472370 B CN111472370 B CN 111472370B
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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
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/103—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by installing wick drains or sand bags
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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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- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
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- Soil Sciences (AREA)
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- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a slope collapse prevention structure for an expressway and a construction method thereof, wherein the slope collapse prevention structure comprises a support system, a drain pipe, a water interception ditch and a slope support surface, the support system is arranged in a slope and connected with the slope support surface, the slope support surface is formed by a steel mesh and concrete mortar, the drain pipe is inserted into the slope and arranged at the bottom of the slope, the water interception ditch is communicated with the drain pipe, the part of the drain pipe inserted into the slope is uniformly provided with water permeable holes, and the periphery of the drain pipe is wrapped with sponge as a filter layer; the timeliness of highway slope reinforcement is fully considered, the construction process is simple, the highway slope reinforcement can be timely constructed, in addition, the supporting structure has good bearing capacity and deformation resistance, the water in the slope soil body can be discharged through the water discharge pipe, the bearing capacity and the stability of the slope soil body can be effectively improved through the vertical pipe and the tangential pipe reinforcement, and damage is avoided.
Description
Technical Field
The invention relates to the technical field of side slope protection, in particular to a side slope anti-collapse structure for a highway and a construction method thereof.
Background
In recent years, as the highway process of China steps into the high-speed development stage, the slope coefficient of the slope is greatly limited during the construction of the highway slope, and meanwhile, the foundation pit slope has great potential safety hazard due to the complex proximity condition and the hydrogeological condition; the stability of the side slope also influences the stability and safety of the highway, and the instability, large deformation and damage of the side slope can cause uneven settlement of the road surface, so that the road surface is inclined, cracked and even collapsed, and huge economic loss is caused to the country and the society; there are many current slope supporting modes, and row pile type supporting structures, underground continuous walls, cement-soil walls, deep mixing cement-soil enclosure walls, high-pressure jet grouting piles, SMW (soil mixing wall) construction methods and the like which take cast-in-situ bored piles or reinforced concrete slabs as main bodies.
However, these methods consume a lot of materials, are complicated to construct, cause a lot of environmental pollution, and cannot dynamically adjust the support, so that a foundation pit slope support method which is reasonable in material consumption, simple to construct, and capable of dynamically adjusting is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention discloses a slope collapse prevention structure for an expressway and a construction method thereof, which fully consider the timeliness of the slope reinforcement of the expressway, have simple construction procedures and can be constructed in time, in addition, the support structure has good bearing capacity and deformation resistance, can track the field monitoring result for grouting reinforcement, can effectively save the cost and improve the reliability of the support structure, the soil nail body with certain length and distribution density arranged in the soil body and the soil act together to make up the deficiency of the self strength of the soil body, improve the integral rigidity of the soil body and make up the weak point of low tensile strength and shear strength of the soil body, in addition, the ductility of the soil nail can ensure that the slope can not generate brittle failure even if the slope is damaged, but plastic failure, a cut-off ditch and a drain pipe are important structures for controlling the water level in the slope soil body, and the stability of the slope is reduced due to overhigh height, the intercepting ditch can effectually prevent rainfall and the influence of surface ponding to the side slope, the interior water of side slope soil body can be got rid of to the drain pipe, and effectual reduction water level when the side slope warp too big or deformation rate is too big, through the standpipe with the tangential pipe consolidates bearing capacity and the stability that can effectual improvement side slope soil body, avoids taking place to destroy.
In order to achieve the above purpose, the invention provides the following technical scheme:
a slope collapse prevention structure for an expressway and a construction method thereof comprise a support system, a drain pipe, a catch basin and a slope support surface, wherein the support system is arranged in a slope and connected with the slope support surface, the slope support surface is composed of a steel bar net and concrete mortar, the steel bar net is orthogonally distributed at an interval of 200mm by adopting high bars with the diameter of 8mm, the steel bar net is 100mm away from the slope, the drain pipe is inserted into the slope and arranged at the bottom of the slope, the catch basin is arranged at the horizontal planes of the slope top and the slope foot of the slope and is communicated with the drain pipe at the slope foot, the part of the drain pipe inserted into the slope is uniformly provided with water permeable holes, and the periphery of the drain pipe is wrapped with sponge to serve as a filter layer;
the supporting system comprises a vertical pipe, a tangential pipe and soil nails, the vertical pipe is vertically arranged in the side slope, the vertical pipe is horizontally arranged beyond the top of the slope and is 1-2 m away from the top of the slope, the length of the vertical pipe is larger than the depth of the side slope, arranging one vertical pipe at every 2m of the slope top, wherein the tangential pipe is perpendicular to the slope supporting surface, the tangential pipes extend into the side slope from the side slope supporting surface, the tangential pipes are hollow pipes, 1 vertical pipe is communicated with the tangential pipes, the vertical pipes penetrate through the tangential pipes, the tangential pipes are arranged at intervals of 2m, the soil nails are inserted into the side slope along the tangential pipes and are arranged corresponding to the tangential pipes, the diameters of the tangential pipe and the vertical pipe are both 60mm, and the tangential pipe and the vertical pipe are both steel pipes;
the soil nail comprises a nail head, a blocking piece and a nail cap, wherein the nail head is arranged at one end of the soil nail, threads are arranged on the nail head, the other end of the nail head is connected with the nail cap, the diameter of the nail cap is larger than that of the tangential pipe, the diameter of the soil nail is 25mm, the soil nail is an HRB400 ribbed steel bar with the length of 7m, the nail cap is welded and fixed with the steel bar mesh, the blocking piece is uniformly arranged on the nail body of the soil nail, the blocking piece is arranged at intervals of 500mm, and the sum of the section length of the blocking piece and the section diameter of the nail body is smaller than 55 mm.
As a further description of the above technical solution:
the sponge is only wrapped on the part of the drain pipe inserted into the side slope. As a further description of the above technical solution:
the concrete mortar adopts concrete with the impermeability grade of P10, and the reinforcing mesh is completely wrapped by the surface layer of the concrete mortar.
As a further description of the above technical solution:
the vertical pipe and the tangential pipe are filled with concrete. As a further description of the above technical solution:
s1: drilling a side slope, drilling hole sites with the distance of 2m, the diameter of 60 mm-70 mm and the depth of not less than 7m at the tangential direction of the slope surface, and drilling vertical through holes at the top of the slope until the vertical through holes exceed the slope toe by 1m, the distance of 2m and the diameter of 60 mm-70 mm;
s2: inserting the tangential pipe, wherein the tangential pipe extends into the through hole for 4m, the top end of the tangential pipe is flush with the slope surface, the vertical pipe is inserted, and the vertical pipe is inserted from the through hole on the tangential pipe and is communicated with the tangential pipe;
s3: inserting the soil nails into the tangential pipe;
s4: arranging the reinforcing mesh on the slope surface of the side slope, and welding the reinforcing mesh with the nail caps of the soil nails;
s5: introducing concrete with impervious grade not lower than P10 into the vertical pipe and the tangential pipe, wherein the concrete is completely mixed
Filling in the standpipe and the tangential pipe;
s6: after the concrete in the S5 is solidified, pouring concrete with impervious grade of P10 to the slope surface of the side slope to form the edge
A slope supporting surface.
As a further description of the above technical solution:
a drain hole is drilled after the S1, and the drain pipe is inserted.
As a further description of the above technical solution:
and chiseling a catch basin at the toe after the step S6.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the timeliness of highway slope reinforcement is fully considered, the construction process is simple, the construction can be carried out in time, the supporting structure has good bearing capacity and deformation resistance, the field monitoring result can be tracked for grouting reinforcement, the cost can be effectively saved, and the reliability of the supporting structure is improved;
2. the soil nails with certain length and distribution density are placed in the soil body to act together with the soil, so that the defect of the self strength of the soil body is overcome, the integral rigidity of the soil body is improved, the weak points of the soil body with low tensile strength and low shear strength are overcome, and in addition, the ductility of the soil nails ensures that the side slope cannot be subjected to brittle failure but plastic failure even if the side slope is damaged;
3. the intercepting ditch and the drain pipe are important structures for controlling the water level in the slope soil body, the stability of the slope is reduced due to the overhigh water level, the intercepting ditch can effectively prevent rainfall and the influence of accumulated water on the slope, and the drain pipe can remove the water in the slope soil body and effectively reduce the water level;
4. the vertical pipe and the tangential pipe are used for reinforcing, so that the bearing capacity and stability of the slope soil body can be effectively improved, and damage is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a highway highwall slope collapse prevention structure;
FIG. 2 is a schematic view of a highway highwall slope collapse prevention structure;
FIG. 3 is a schematic view of a highway highwall slope collapse prevention structure;
FIG. 4 is a schematic view of a highway highwall slope collapse prevention structure;
fig. 5 is a schematic view of a slope collapse prevention structure for an expressway.
The labels in the figure are: 1-vertical pipe, 2-tangential pipe, 3-soil nail, 4-drainage pipe, 5-catch drain, 6-slope support surface, 301-nail head, 302-separation blade and 303-nail cap.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment is a structure for a slope collapse prevention structure of an expressway and a construction method thereof, and the structure comprises a support system, a drain pipe 4, a catch basin 5 and a slope support surface 6, wherein the support system is arranged in a slope and connected with the slope support surface 6, the slope support surface 6 is composed of a steel bar mesh and concrete mortar, and the steel bar mesh adopts high bars with the diameter of 8mm at intervals
The reinforcing mesh is orthogonally distributed at 200mm, the reinforcing mesh is 100mm away from the slope surface, the drain pipe 4 is inserted into the side slope and is arranged at the bottom of the side slope, the intercepting ditch 5 is arranged at the horizontal plane of the slope top and the slope foot of the side slope, the intercepting ditch 5 arranged at the slope foot is communicated with the drain pipe 4, the part of the drain pipe 4 inserted into the side slope is uniformly provided with water permeation, and the periphery of the drain pipe 4 is wrapped with sponge to be used as a filter layer;
the supporting system comprises vertical pipes 1, tangential pipes 2 and soil nails 3, wherein the vertical pipes 1 are vertically arranged in the side slope, the vertical pipes 1 exceed the horizontal arrangement of the top of the slope and are 1-2 m away from the top of the slope, the length of each vertical pipe 1 is greater than the depth of the side slope, one vertical pipe 1 is arranged at every 2m of the top of the slope, the tangential pipes 2 are vertically arranged with the side slope supporting surface 6, the tangential pipes 2 extend into the side slope from the side slope supporting surface 6, the tangential pipes 2 are hollow pipes, 1 vertical pipe 1 is communicated with a plurality of tangential pipes 2, the vertical pipes 1 are inserted into the tangential pipes 2 in a penetrating manner, the plurality of tangential pipes 2 are arranged at intervals of 2m, and the soil nails 3 are inserted into the side slope along the tangential pipes 2, the soil nails 3 are arranged corresponding to the tangential pipes 2, the diameters of the tangential pipes 2 and the vertical pipes 1 are both 60mm, and the tangential pipes 2 and the vertical pipes 1 are both steel pipes;
the soil nail 3 comprises a nail head 301, a blocking piece 302 and a nail cap 303, wherein the nail head 301 is arranged at one end of the soil nail 3, the nail head 301 is provided with threads, the other end of the nail head 301 is connected with the nail cap 303, the diameter of the nail cap 303 is larger than that of the tangential pipe 2, the soil nail 3 is composed of HRB400 ribbed steel bars with the diameter of 25mm and the length of 7m, the nail cap 303 and the steel bar mesh are welded and fixed, the blocking pieces 302 are uniformly arranged on the body of the soil nail 3, the blocking pieces 302 are arranged at intervals of 500mm, and the sum of the section length of the blocking pieces 302 and the section diameter of the nail body is smaller than 55 mm;
the sponge is only wrapped on the part of the drain pipe 4 inserted into the side slope, and the arrangement of the sponge can prevent soil from entering the drain pipe 4 and prevent the drain pipe 4 from being blocked;
preferably, the concrete mortar adopts concrete with the impermeability grade of P10, the surface layer of the concrete mortar completely wraps the reinforcing mesh, and the vertical pipe 1 and the tangential pipe 2 are both filled with concrete;
s1: drilling a side slope, drilling hole sites with the distance of 2m, the diameter of 60 mm-70 mm and the depth of not less than 7m at the tangential direction of the slope surface, and drilling vertical through holes at the top of the slope until the vertical through holes exceed the slope toe by 1m, the distance of 2m and the diameter of 60 mm-70 mm;
s2: inserting the tangential pipe 2, wherein the tangential pipe 2 extends into the through hole 4m, the top end of the tangential pipe 2 is flush with the slope surface and is inserted into the vertical pipe 1, and the vertical pipe 1 is inserted from the through hole on the tangential pipe 2 and is communicated with the tangential pipe 2;
s3: inserting the soil nails 3 into the tangential pipe 2;
s4: arranging the reinforcing mesh on the slope surface of the side slope, and welding the reinforcing mesh with the nail cap 303 of the soil nail 3;
s5: introducing concrete with impervious grade not lower than P10 into the vertical pipe 1 and the tangential pipe 2, wherein the concrete
Completely filled in said standpipe 1 and said tangential pipe 2;
s6: after the concrete in the S5 is solidified, pouring concrete with impervious grade of P10 to the slope surface of the side slope to form the side slope supporting surface 6;
drilling a drain hole after the step S1, inserting the drain pipe 4, and chiseling a catch basin 5 at the toe after the step S6; since the nail head 301 of the soil nail 3 is provided with a thread, the soil nail 3 can rotate in the side slope, and the side slope is formed at the moment
The baffle plate 302 is clamped with the soil body of the side slope, and the baffle plate 302 can be wrapped by concrete in the tangential pipe 2 to play a better fixing role;
in conclusion, the invention fully considers the timeliness of highway slope reinforcement, has simple construction process, can be applied in time, has good bearing capacity and deformation resistance, can track the field monitoring result for grouting reinforcement, can effectively save cost and improve the reliability of the support structure, overcomes the defect of insufficient strength of the soil body by placing the soil nails 3 with certain length and distribution density in the soil body and the combined action of soil, improves the integral rigidity of the soil body, overcomes the defect of low tensile strength and shear strength of the soil body, ensures that the slope cannot be subjected to brittle failure but plastic failure by the ductility of the soil nails 3 even if the slope is broken, ensures that the intercepting ditch 5 and the drain pipe 4 are important structures for controlling the water level in the slope soil body, reduces the stability of the slope by overhigh water level, and can effectively prevent rainfall and surface ponding from influencing the slope, the water discharging pipe 4 can discharge water in a side slope soil body, effectively reduces the water level, and can effectively improve the bearing capacity and stability of the side slope soil body through the vertical pipe 1 and the tangential pipe 2 for reinforcement when the side slope is deformed too much or the deformation rate is too great, so that damage is avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. The utility model provides a structure of preventing collapsing of side slope for highway which characterized in that: the water drainage device comprises a supporting system, a water drainage pipe (4), a catch basin (5) and a side slope supporting surface (6), wherein the supporting system is arranged in a side slope and connected with the side slope supporting surface (6), the side slope supporting surface (6) is composed of a steel bar net and concrete mortar, the steel bar net is orthogonally distributed at intervals of 200mm by adopting high bars with the diameter of 8mm, the steel bar net is 100mm away from the slope surface, the water drainage pipe (4) is inserted into the side slope and arranged at the bottom of the side slope, the catch basin (5) is arranged at the horizontal plane of the top and the foot of the side slope, the catch basin (5) arranged at the foot of the slope is communicated with the water drainage pipe (4), water permeable holes are uniformly formed in the part of the water drainage pipe (4) inserted into the side slope, and sponge is wrapped on the periphery of the water drainage pipe (4) to serve as a filter layer;
the supporting system comprises vertical pipes (1), tangential pipes (2) and soil nails (3), wherein the vertical pipes (1) are vertically arranged in the side slope, the vertical pipes (1) exceed the level of the top of the slope and are 1-2 m away from the top of the slope, the length of each vertical pipe (1) is greater than the depth of the side slope, each 2m of the top of the slope is provided with one vertical pipe (1), the tangential pipes (2) are perpendicular to the supporting surface (6) of the side slope, the tangential pipes (2) extend into the side slope from the supporting surface (6) of the side slope, the tangential pipes (2) are hollow pipes, 1 vertical pipe (1) is communicated with a plurality of tangential pipes (2), the vertical pipes (1) are inserted into the tangential pipes (2) in a penetrating manner, the tangential pipes (2) are arranged at intervals of 2m, and the soil nails (3) extend into the side slope along the tangential pipes (2), the soil nails (3) are arranged corresponding to the tangential pipes (2), the diameters of the tangential pipes (2) and the vertical pipes (1) are 60mm, and the tangential pipes (2) and the vertical pipes (1) are steel pipes;
soil nail (3) include pin fin (301), separation blade (302), nut (303), the one end of soil nail (3) is provided with pin fin (301), just pin fin (301) are provided with the screw thread, the other end of pin fin (301) is connected with nut (303), the diameter of nut (303) is greater than the diameter of tangential pipe (2), the diameter of soil nail (3) is 25mm, the soil nail is length HRB400 ribbed steel bar that is 7m, nut (303) with reinforcing bar net welded fastening, separation blade (302) have evenly been arranged to the nail body of soil nail (3), separation blade (302) interval 500mm sets up, the cross sectional length of separation blade (302) with the sum of the cross sectional diameter of nail body is less than 55 mm.
2. A slope collapse prevention structure for a highway according to claim 1, wherein: the sponge is only wrapped on the part of the drain pipe (4) inserted into the side slope.
3. A slope collapse prevention structure for a highway according to claim 1, wherein: the concrete mortar adopts concrete with the impermeability grade of P10, and the reinforcing mesh is completely wrapped by the surface layer of the concrete mortar.
4. A slope collapse prevention structure for a highway according to claim 1, wherein: concrete is filled in the vertical pipe (1) and the tangential pipe (2).
5. A construction method of a side slope collapse prevention structure of a highway based on claim 1, characterized by comprising: the method comprises the following steps:
s1: drilling a side slope, drilling hole sites with the distance of 2m, the diameter of 60 mm-70 mm and the depth of not less than 7m at the tangential direction of the slope surface, and drilling vertical through holes at the top of the slope until the vertical through holes exceed the toe by 1m, the distance of 2m and the diameter of 60 mm-70 mm;
s2: inserting a tangential pipe (2), wherein the tangential pipe (2) extends into the through hole 4m, the top end of the tangential pipe (2) is flush with the slope surface and is inserted into a vertical pipe (1), and the vertical pipe (1) is inserted from the through hole on the tangential pipe (2) and is communicated with the tangential pipe (2);
s3: inserting soil nails (3) into the tangential pipes (2);
s4: arranging a reinforcing mesh on the slope surface of the side slope, and welding the reinforcing mesh with a nail cap (303) of the soil nail (3);
s5: introducing concrete with the impervious grade not lower than P10 into the vertical pipe (1) and the tangential pipe (2), and completely filling the concrete into the vertical pipe (1) and the tangential pipe (2);
s6: and after the concrete in the S5 is solidified, pouring concrete with impervious grade of P10 to the slope surface of the side slope to form a side slope supporting surface (6).
6. The construction method of a slope collapse prevention structure for an expressway of claim 5, wherein: after S1, a drain hole is drilled and a drain pipe (4) is inserted.
7. The construction method of a slope collapse prevention structure for an expressway of claim 5, wherein: and (5) chiseling a catch basin (5) at the toe of the slope after S6.
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| CN114893118A (en) * | 2022-06-10 | 2022-08-12 | 广州公路工程集团有限公司 | Implementation method for implementing high highway slope by adopting down-the-hole pipe following drilling and additionally arranging water permeability |
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