CN114892554B - Pavement structure of road culvert - Google Patents
Pavement structure of road culvert Download PDFInfo
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- CN114892554B CN114892554B CN202210705419.1A CN202210705419A CN114892554B CN 114892554 B CN114892554 B CN 114892554B CN 202210705419 A CN202210705419 A CN 202210705419A CN 114892554 B CN114892554 B CN 114892554B
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- culvert
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- soft soil
- soil foundation
- pavement structure
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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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
-
- 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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
-
- 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
- E02D29/10—Tunnels or galleries specially adapted to house conduits, e.g. oil pipe-lines, sewer pipes ; Making conduits in situ, e.g. of concrete ; Casings, i.e. manhole shafts, access or inspection chambers or coverings of boreholes or narrow wells
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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
-
- 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Road Paving Structures (AREA)
Abstract
The application discloses a pavement structure of a road culvert. This structure of mating formation includes: a soft soil foundation layer; the filling layer surrounds the outer side surface of the culvert and is overlapped in the area of the soft soil foundation layer, which is not provided with the culvert, so as to fill in building waste residues; the middle part of the rigid plate is covered between the soft soil foundation layer and the culvert, and the two end parts of the rigid plate are positioned in the filling layer; a geogrid covering the rigid plate; and the flexible material layer is covered on the top surface of the culvert. In the technical scheme, the characteristic of large flexibility of the soft soil foundation can be utilized to reduce the pressure of the culvert top soil; the building waste residue can enable the transmission forces on two sides to be applied to the building waste residue, so that the stress on the culvert top and the side wall of the culvert is reduced; the rigid plates can ensure uniform settlement of the culvert; the geogrid can enable the force of the culvert top to be better transferred to two sides and ensure that the culvert is settled within an allowable range. The technology can reserve partial soft soil foundation, can effectively reduce the soil pressure of culvert top and the soil pressure of culvert side, and has the characteristics of convenient construction, shortened construction period and the like.
Description
Technical Field
The application relates to the technical field of road construction, in particular to a pavement structure of a road culvert.
Background
In the related art, in the construction of the soft soil foundation, related treatment such as replacement and pile foundation filling is often carried out on the soft soil foundation because the soft soil foundation does not meet the bearing capacity requirement, but almost all the measures are to discard soft soil, and the method for increasing the rigidity of the foundation is intended to meet the bearing capacity requirement, so that the characteristics of the soft soil are not utilized. For culverts, because the upper surface of the culvert is covered with high filling soil, the top of the culvert is concentrated with great stress, so that the stress of the culvert top is larger than the soil covering pressure, and the culvert top is cracked and destroyed. The common load shedding measures can lead the pressure of the culvert top soil to be transferred to the culvert side wall, so that the horizontal soil pressure of the culvert side is overlarge, and the culvert side wall is cracked and damaged.
Disclosure of Invention
In view of this, the present application provides a pavement structure of a road culvert, which can effectively offload the culvert.
The application provides a pavement structure of a road culvert, which comprises the following components:
a soft soil foundation layer for bearing on the bottom surface of the culvert;
the filling layer surrounds the outer side surface of the culvert and is overlapped in the area of the soft soil foundation layer, which is not used for bearing the culvert, and the filling layer is used for filling building waste residues;
the middle part of the rigid plate is covered between the soft soil foundation layer and the culvert, and the two end parts of the rigid plate are positioned in the filling layer;
a geogrid covering the rigid plate;
and the flexible material layer is covered on the top surface of the culvert.
Optionally, the whole filling layer is trapezoid with narrow bottom and wide top.
Optionally, the upper width of the filling layer is 0.5-1 times of the width of the culvert.
Optionally, the height of the flexible material is 20-30 cm.
Optionally, the flexible material is a tire aggregate.
Optionally, the geogrid is coated with cement mortar in a partial area of the backfill layer.
Optionally, the rigid plate is a carbon fiber reinforced plastic plate.
Optionally, the geogrid is a fiberglass geogrid.
Optionally, the cement mortar is M30 mortar.
The pavement structure of the road culvert can reduce the top soil pressure of the culvert by utilizing the characteristic of large flexibility of the soft soil foundation; the elevation of the building waste residue is slightly higher than the elevation of the culvert top, so that the forces transmitted by the two sides are applied to the building waste residue, and the stress of the culvert top and the side wall of the culvert is reduced; the rigid plates can ensure uniform settlement of the culvert; the geogrid can enable the force of the culvert top to be better transferred to two sides and ensure that the culvert is settled within an allowable range. The technology can reserve partial soft soil foundation, can effectively reduce the soil pressure of culvert top and the soil pressure of culvert side, and has the characteristics of convenient construction, shortened construction period and the like.
Drawings
The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a paving structure provided in an embodiment of the application, in which a flexible material layer is omitted.
Fig. 2 is a schematic diagram of a pavement structure provided in an application embodiment.
FIG. 3 is a diagram of a test model of an unloaded culvert in the related art.
FIG. 4 is a diagram of a test model of a typical deloading culvert in the related art.
Fig. 5 is a test model diagram of a pavement structure provided in an application example.
FIG. 6 is a graph comparing the data of the soil pressure of the culvert top of the present application with the data of the soil pressure of the related art.
FIG. 7 is a graph showing comparison of the culvert side soil pressure data of the present application with those of the related art.
Wherein, the elements in the figure are identified as follows:
20-a soft soil foundation layer; 30-changing the filling layer; 40-rigid plate; 50-geogrid; a layer of 60-flexible material; 200-culvert.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Referring to fig. 1 and 2, the present application provides a paving structure of a road culvert 200, including:
a soft soil foundation layer 20 for bearing on the bottom surface of the culvert 200;
a filling layer 30 surrounding the outer side of the culvert 200 and overlapping the soft soil foundation layer 20 in the area not bearing the culvert 200, wherein the filling layer 30 is used for filling in building waste residues;
a rigid plate 40, the middle part of which is covered between the soft soil foundation layer 20 and the culvert 200, and the two end parts of which are positioned in the filling layer 30;
a geogrid 50 overlying the rigid plate 40;
and a flexible material layer 60 covering the top surface of the culvert 200.
The expression "the infill layer 30 surrounds the outer side of the culvert 200 and is overlapped on the area of the soft foundation layer 20 not bearing the culvert 200" means that the soft foundation layer 20 partially bears the culvert 200 and the partial area bears the infill layer 30.
As an exemplary implementation of the refill layer 30, the refill layer 30 has a trapezoid shape with a narrow bottom and a wide top.
Thus, by having a shape with a narrow bottom and a wide top, the foundation of the stent 200 surrounded by the stent 30 is more firm, that is, the stent 200 is similarly "squeezed" from outside to inside by the stent 30. More importantly, for the culvert 200, the area of the soft soil foundation layer 20 bearing the culvert 200 presents a cone shape with a wide bottom and a narrow top, so that the bearing stability of the soft soil foundation layer 20 to the culvert 200 is improved, and the subsidence of the soft soil foundation layer 20 is avoided.
As an exemplary implementation of one dimension, the upper width of the backfill layer 30 is 0.5-1 times the width of the culvert 200.
Regarding the function or effect of the rigid plate 40, the foregoing description of the middle part being covered between the soft soil foundation layer 20 and the culvert 200 and the two end parts being located in the filling layer 30, can make the rigid plate 40 act to provide a side pulling force between the filling layer 30 and the culvert 200, thereby improving the "extrusion force" generated by the surrounding of the filling layer 30 to the outer side of the culvert 200, making the building waste residue gather more densely, and further improving the buffering effect of the filling layer 30 to the external force acting on the outer side of the culvert 200.
As an exemplary implementation of the rigid plate 40, the rigid plate 40 is a carbon fiber reinforced plastic plate, although other implementations are possible.
In some embodiments, the flexible material has a height of 20 to 30cm.
In some embodiments, the flexible material is tire aggregate.
In some embodiments, the geogrid 50 is coated with cement mortar in a partial area of the backfill layer 30.
In some embodiments, the geogrid 50 is a fiberglass geogrid 50.
In some embodiments, the cement mortar is an M30 mortar.
The construction process of the pavement structure of the application is now described with respect to a common application scenario. It should be noted that this common embodiment is not to be taken as a basis for understanding the essential characteristics of the application claimed to solve the technical problem, but is merely exemplary.
Referring to fig. 1 and 2, a construction method for unloading a culvert 200 with high filling of soft soil roadbed is mainly applied to construction of the culvert 200 on soft soil foundation, and includes:
s1: the soft soil area is divided into three blocks, the culvert 200 is arranged in the middle, a carbon fiber reinforced plastic plate is arranged on the culvert 200, and the two sides are the filling areas.
S2: excavating two side filling-changing areas, wherein the filling-changing areas are 1 according to the slope ratio: 1.5, excavating, and then filling the building waste residues. The width of the upper part of the building waste residue is 1/2 times of the width of the culvert 200, the maximum grain diameter of the building waste residue is not more than 15mm, and the building waste residue is filled to the elevation of the rigid plate 40.
S3: carbon fiber plastic reinforcing plates are paved at the horizontal elevation of the rigid plates 40, and the grid width covers the culvert 200 area and the two-side filling areas. And spraying a layer of cement mortar at the geogrid 50 of the two side reclamation areas, wherein the cement mortar adopts M30 mortar.
S4: and constructing the culvert 200 in the area of the culvert 200. After the construction is completed, the edge positions are restrained by adopting right-angle boards, the two sides of each right-angle board are 25cm long, and the tire aggregate is placed in each right-angle board.
S5: and continuously filling the building waste residues to the elevation of the flexible material of the culvert top.
S6: and backfilling the roadbed to the designed elevation.
Further, in order to test the relief effect of the culvert 200 of the present application, a comparison was made with the earth column pressure, the non-relief culvert 200 culvert top and culvert side earth pressure, and the general relief culvert 200 culvert top and culvert side earth pressure. .
Some stress tests are now made on the paving structure of the present application and related techniques. The specific stress test is as follows:
model experiments were used to verify that the experimental settings were as follows:
and (3) earth column method: calculation formula f=γh, γ is the soil weight, and the soil sampling weight is 19kN/m3.
A. Non-load shedding related technology
Referring to FIG. 3, a model box with the length, width and height of 80cm multiplied by 100cm is adopted, and normal soil with the thickness of 4cm is paved at the bottom of the box; placing the culvert 200 in the center, adopting a pvc round pipe culvert with the size diameter of 16cm and the axial length of 70cm as the culvert 200, respectively arranging soil pressure boxes at the top and the side of the culvert, filling 15cm each time in the experimental process, reading after the indication of the soil pressure boxes is stable, and repeatedly filling until the model box is filled; the average value of the sum of the numbers A1 and A2, namely (A1+A2)/2, and the average value of the sum of the numbers B1 and B2, namely (B1+B2)/2.
B. Related art of a general deloading culvert 200
Referring to FIG. 4, a model box with the length, width and height of 80cm multiplied by 100cm is adopted, and normal soil with the thickness of 4cm is paved at the bottom of the box; placing the culvert 200 in the center, adopting a pvc round pipe culvert with the size and the diameter of 16cm as the culvert 200, arranging soil pressure boxes on the culvert top and the culvert side respectively with the axial length of 70cm, and then stacking tire aggregate on the culvert top, wherein the thickness of the tire aggregate is 3cm; filling 15cm each time in the experimental process, reading after the indication number of the soil pressure box is stable, and repeatedly filling until the model box is filled; the average value of the sum of the numbers A1 and A2, namely (A1+A2)/2, and the average value of the sum of the numbers B1 and B2, namely (B1+B2)/2.
C. Test model of pavement structure of the application
Referring to FIG. 5, a model box with the length and width of 80cm multiplied by 100cm is adopted, soft soil with the thickness of 4cm is paved at the bottom of the box, the soft soil area is trapezoid, the upper bottom is 16cm, and the lower bottom is 28cm; paving a carbon fiber reinforced plastic plate with the thickness of 1cm on the surface; building waste residues are piled on two sides of the slope body, the height of the building waste residues is the same as that of the carbon fiber reinforced plastic plate, and the width of the upper part of the building waste residues is 8cm. Then a piece of geogrid 50 with the width of 32cm is placed on the surface; placing the culvert 200 right above the carbon fiber reinforced plastic plate, wherein the culvert 200 adopts pvc round pipe culvert with the dimension diameter of 16cm and the axial length of 70cm; respectively arranging soil pressure boxes at culvert tops and culvert sides; continuously filling the building waste residues until the horizontal height is 3cm higher than the culvert top; and placing tire aggregate at the culvert top, wherein the height is the same as the horizontal height of the building waste residue. Filling 15cm each time in the experimental process, reading after the indication number of the soil pressure box is stable, and repeatedly filling until the model box is filled; the average value of the sum of the numbers A1 and A2, namely (A1+A2)/2, and the average value of the sum of the numbers B1 and B2, namely (B1+B2)/2.
Referring to fig. 6 and 7, the vertical soil pressure and horizontal soil pressure levels of the present application are significantly higher than those of the related art, which fully illustrates the intelligent contribution of the paving structure of the specific construction of the present application to the related art.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.
Claims (8)
1. The utility model provides a pavement structure of road culvert which characterized in that includes:
a soft soil foundation layer for bearing on the bottom surface of the culvert;
the filling layer surrounds the outer side surface of the culvert and is overlapped in the area of the soft soil foundation layer, which is not used for bearing the culvert, and the filling layer is used for filling building waste residues;
the middle part of the rigid plate is covered between the soft soil foundation layer and the culvert, and the two end parts of the rigid plate are positioned in the filling layer;
a geogrid covering the rigid plate;
and a flexible material layer covering the top surface of the culvert;
the soft soil foundation layer is trapezoid with upper narrow and lower wide, and the whole filling layer is trapezoid with lower narrow and upper wide.
2. The pavement structure of claim 1, wherein the upper width of the replacement layer is 0.5-1 times the width of the culvert.
3. The pavement structure of claim 1, wherein the flexible material has a height of 20-30 cm.
4. The paving of claim 1, wherein the flexible material is tire aggregate.
5. The pavement structure of claim 1, wherein the geogrid is coated with cement mortar in a partial area of the backfill layer.
6. The pavement structure of claim 1, wherein the rigid plate is a carbon fiber reinforced plastic plate.
7. The pavement structure of claim 1, wherein the geogrid is a fiberglass geogrid.
8. The pavement structure of claim 5, wherein the cement mortar is M30 mortar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210705419.1A CN114892554B (en) | 2022-06-21 | 2022-06-21 | Pavement structure of road culvert |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210705419.1A CN114892554B (en) | 2022-06-21 | 2022-06-21 | Pavement structure of road culvert |
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| Publication Number | Publication Date |
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| CN114892554A CN114892554A (en) | 2022-08-12 |
| CN114892554B true CN114892554B (en) | 2023-10-03 |
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| CN114892554A (en) | 2022-08-12 |
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