CN209975287U - Mountain area highway subgrade structure in narrow construction operation area - Google Patents
Mountain area highway subgrade structure in narrow construction operation area Download PDFInfo
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- CN209975287U CN209975287U CN201920528809.XU CN201920528809U CN209975287U CN 209975287 U CN209975287 U CN 209975287U CN 201920528809 U CN201920528809 U CN 201920528809U CN 209975287 U CN209975287 U CN 209975287U
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Abstract
The utility model provides a mountain highway subgrade structure in a narrow construction operation area, which belongs to the technical field of highway subgrades and comprises a subgrade bottom layer and a stone-filling subgrade layer which are arranged from bottom to top in sequence; the roadbed bottom layer comprises a first cushion layer and a second cushion layer which are arranged from bottom to top in sequence; the stone-filled road base layer is a mixed filler layer and is a mixture of stone and fluid materials, and the stone-filled road base layer comprises a plurality of layers which are arranged in a stacked mode; the longitudinal two ends of the roadbed bottom layer and the stone filling roadbed layer are respectively provided with a step-shaped connecting part. The utility model provides a pair of narrow construction operation district mountain area highway roadbed structure adopts bold building stones and flow state material to mix as filling stone road bed layer, and flow state material passes through the pump sending and can adapt to the topography in narrow operation district, permeates into the gap between the bold rock for flow state material and bold building stones are integrated, have stabilized the bottom of road bed, and it is simple to have a construction method, and construction cycle is short, does not need the technological effect of a large amount of manpowers and financial resources.
Description
Technical Field
The utility model belongs to the technical field of the highway subgrade, more specifically say, relate to a narrow construction operation district mountain area highway subgrade structure.
Background
Good traffic can promote the accelerated development of economy, so that the road construction becomes the key point of the economic construction of China and is already brought into the development plan and the planning of the national economy. Particularly for mountain road construction, the method not only relates to the development of economy in remote areas of China, but also puts forward higher requirements on road construction. The highway subgrade is the foundation of the pavement and bears the action of traffic load together with the pavement, and no firm and stable subgrade is provided. The quality of the roadbed can directly affect the use quality, the strength, the drainage and other aspects of the road surface, so that the roadbed needs to have enough strength and overall stability so as to enhance the use performance of the road and prolong the service life of the road.
The subgrade filler and its degree of compaction determine to a large extent the strength and stability of the subgrade. When a highway is constructed in a mountain area, a large amount of constructions such as roadbed excavation and backfilling are mostly carried out. The design specification of highway subgrade stipulates that the grain diameter of subgrade filler is not more than two thirds of the paving thickness, but the specification does not mention a method for filling the subgrade by using crushed stone with super-large grain diameter. But the strength and stability of the crushed stone with the super-large particle size are far better than those of the crushed stone with the small particle size. If not utilized, the resources are wasted. At present, two methods are used for treating crushed stone with ultra-large particle size (such as the particle size of 1-2 meters), one is field blasting, and the other is discarding. In design drawings, a method of blasting stone is sometimes adopted to treat the crushed stones with the ultra-large particle sizes, but the method is time-consuming, labor-consuming and high in manufacturing cost. This problem is usually solved by rockfill foundations in order to make reasonable use of rockfill in mountainous areas or tunnel excavation waste. On the construction site of the rockfill roadbed in the mountainous area, the roadbed frequently meets the roadbed mixed by rocks and fine-grained soil, the strength of the roadbed is very uneven, meanwhile, the surface of the roadbed is not easy to level, if necessary measures are not taken, the stability of the roadbed is greatly influenced, uneven settlement of the mountainous area highway is caused, and finally the roadbed and the road surface are damaged.
For example, the patent with application number 201711028844.7, entitled self-compacting road backfill material produced by using stone saw mud and a construction method thereof, is suitable for narrow areas in highways and municipal works or works which cannot be vibrated and compacted by using large machinery, but has low strength, and secondary damage to the road surface can be caused by insufficient strength in the subsequent driving process, which further indicates that a filler with high strength needs to be added to improve the strength of the roadbed so that the roadbed has sufficient bearing capacity.
When the construction is carried out in the narrow operation area of the mountainous area, the operation area is narrow, the construction machinery and the construction sidewalk are not easy to construct, and the conventional mountain area roadbed structure is not easy to construct, so that the mountain area highway roadbed structure in the narrow construction operation area is provided in order to solve the problems that the construction machinery is difficult to enter the field, the construction sidewalk is not easy to construct and the like in the narrow construction operation area.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a narrow construction operation district mountain road bed structure to solve the more difficult road bed construction that exists among the prior art on the narrow operation district highway in mountain area, and can not make full use of super large particle diameter rubble, caused the waste of resource, current construction method is long because of its construction period, and need maintain often after the construction is accomplished, has wasted the technical problem of a large amount of manpowers and financial resources.
In order to achieve the above object, the utility model adopts the following technical scheme: the provided mountain highway subgrade structure in a narrow construction operation area comprises a subgrade bottom layer and a stone-filled subgrade base layer which are arranged in sequence from bottom to top; the roadbed bottom layer comprises a first cushion layer and a second cushion layer which are arranged from bottom to top in sequence; the stone-filled roadbed is a mixed filler layer which is a mixture of stones and fluid materials, and the stone-filled roadbed comprises a plurality of layers which are arranged in a stacked mode; the roadbed bottom layer and the longitudinal two ends of the stone-filled roadbed are provided with step-shaped connecting parts for connecting adjacent roadbed structures.
Further, the roadbed bottom layer and the two ends of the stone-filled roadbed layer are provided with a plurality of layers of roadbed covering soil, and each layer of roadbed covering soil is compacted by filling.
Further, the first cushion layer is a large-particle conglomerate cushion layer, the second cushion layer is a small-particle conglomerate cushion layer, the sum of the thicknesses of the first cushion layer and the second cushion layer is larger than 30cm, and the first cushion layer and the second cushion layer are both provided with cross slopes with the gradient larger than 3%.
Furthermore, geocells are arranged in the first cushion layer and the second cushion layer.
Further, the stone is large-particle-size hard rock; the fluid material is foamed light soil or liquid fly ash, and the proportion of the stone material to the fluid material in the mixed filler layer is 1: 1.
Furthermore, the subgrade bottom with the joint of filling stone roadbed layer is equipped with prevention of seepage geotechnological cloth, the subgrade bottom deviates from one side of filling stone roadbed layer is equipped with the geotechnological cloth that permeates water.
Further, the width of the roadbed tipping soil is less than 2m, and the thickness of each layer of the roadbed tipping soil is less than 30 cm.
Further, the connecting part is in a positive step shape.
Further, the stone-filled road base layer is 3-6 layers, and the thickness of each layer is less than 30 cm.
The utility model provides a pair of narrow construction operation district mountain area highway roadbed structure's beneficial effect lies in: compared with the prior art, the utility model relates to a narrow construction operation district mountain area highway roadbed structure, through adopt bold building stones and flow state material to mix as the stone-filled roadbed in the narrow construction operation district highway roadbed structure in mountain area, flow state material can adapt to the topography in narrow operation district through the pump sending, not only let the ground bear less pressure, but also can fully infiltrate in the gap between the bold rock, make flow state material and bold building stones fuse together, the bottom of road bed is stabilized, the cost of supporting the bed course has been reduced compared with conventional technique, and water stability is better; and through the subgrade bottom layer that sets up, the adverse effect of groundwater to the subgrade structure has been kept apart, it is favorable to the drainage still, the three-dimensional deformation of geotechnological check room messenger subgrade bottom layer obtains effective control to use, adopt the mixed packing of big particle size stereoplasm rock and flow state material in the mountain area, make full use of the intensity characteristic of bold stereoplasm rock, construction convenience, can effectively strengthen the overall stability and the intensity of subgrade, guarantee the smooth and easy connection of subgrade, it is simple to have a construction method, construction cycle is short, do not need a large amount of manpowers and financial resources, can satisfy the technological effect of the narrow construction operation area highway subgrade construction in mountain area.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic cross-sectional structural view of a mountain highway subgrade structure in a narrow construction operation area according to an embodiment of the present invention;
fig. 2 is a schematic longitudinal sectional structure view of a mountain highway subgrade structure in a narrow construction operation area according to an embodiment of the present invention;
fig. 3 is a top view of a stone-filled roadbed structure in a mountain road roadbed structure in a narrow construction operation area provided by an embodiment of the present invention.
Wherein, in the figures, the respective reference numerals: 1. a roadbed bottom layer; 11. a first cushion layer; 12. a second cushion layer; 2. filling a stone road base layer; 21. stone material; 22. a fluid material; 3. a connecting portion; 4. roadbed covering soil; 5. anti-seepage geotextile; 6. and (5) water-permeable geotextile.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1 to fig. 3, a mountain road bed structure in a narrow construction work area according to an embodiment of the present invention will be described. The mountain highway subgrade structure in the narrow construction operation area comprises a subgrade bottom layer 1 and a stone-filled subgrade base layer 2 which are arranged in sequence from bottom to top; the roadbed bottom layer 1 is positioned at the lower part, the stone-filled roadbed layer 2 is positioned at the upper part, the foundation treatment is firstly carried out, the later roadbed layer 1 construction is carried out, the roadbed tipping soil 4 construction is carried out, then the stone filling materials and fluid materials are filled, and finally the stone-filled roadbed layer 2 is poured into a plurality of layers.
The roadbed bottom layer 1 comprises a first cushion layer 11 and a second cushion layer 12 which are arranged from bottom to top in sequence; the roadbed bottom layer 1 comprises a two-layer structure, the particle size of gravel rocks in the first cushion layer 11 is large and is placed at the lower part, the particle size of gravel rocks in the second cushion layer 12 is small and is placed at the upper part, the gravel rocks are manually separated into two types with different particle sizes during construction, and the construction mode is simple;
the stone-filled roadbed 2 is a mixed filler layer and is a mixture of stone 21 and a fluid material 22, and the stone-filled roadbed 2 comprises a plurality of layers which are arranged in a stacked mode; during construction, a 6.0m multiplied by 6.0m grid is manually formed in the stone roadbed section by lime, the large stones 21 are placed in the grid for paving and filling, and then the flowable filler is poured. The stone 21 and the fluid material 22 are mixed and solidified to form the roadbed, the fluid material 22 can be fly ash, and the stone-filled roadbed 2 is poured in a layered mode.
The roadbed bottom layer 1 and the longitudinal two ends of the stone-filled roadbed 2 are respectively provided with a step-shaped connecting part 3 for connecting adjacent roadbed structures. Connecting portion 3 is the connector of connecting this roadbed structure and ordinary roadbed structure, can be connected step-like connecting portion 3 and other foundation structure, has increased this foundation structure and ordinary foundation structure's area of contact simultaneously, has increased joint strength.
The embodiment of the utility model provides a narrow construction operation district mountain road roadbed structure, compare with prior art, through adopt bold building stones 21 and flow state material to mix as stone-filled roadbed 2 in the narrow construction operation district highway roadbed structure in mountain, flow state material can adapt to the topography in narrow operation district through the pump sending, not only let the ground bear less pressure, but also can fully infiltrate in the gap between the bold rock, make flow state material and bold building stones 21 fuse together, the bottom of road bed has been stabilized, the cost of supporting the bed course has been reduced to more conventional technology, and water stability is better; and through the subgrade bottom 1 that sets up, the adverse effect of groundwater to the roadbed structure has been kept apart, it is favorable to the drainage still, the three-dimensional deformation that makes subgrade bottom 1 obtains effective control to use of geotechnological check room, adopt the mixed packing of big particle size hard rock and flow state material in the mountain area, make full use of the intensity characteristic of bold hard rock, construction convenience, can effectively strengthen the overall stability and the intensity of subgrade, ensure the smooth and easy connection of subgrade, it is simple to have a construction method, construction cycle is short, do not need a large amount of manpowers and financial resources, can satisfy the narrow construction operation area highway subgrade construction's in mountain area technical effect.
As an embodiment of the utility model provides a concrete implementation mode of narrow construction work district mountain road roadbed structure please refer to and draw together fig. 1 to fig. 3, roadbed bottom 1 with the both ends of filling stone road bed layer 2 all are equipped with a plurality of layers of roadbed bordure 4, every layer the roadbed bordure 4 all fills the compaction. The edge-covered soil is earthwork of a 3-position connecting part of the highway subgrade and the soil, and can play a role in stabilizing the highway subgrade.
As an embodiment of the utility model provides a concrete implementation mode of narrow construction operation district mountain road roadbed structure please refer to fig. 1 to fig. 3 together, first bed course 11 is large granule glutenite stone bed course, second bed course 12 is small granule glutenite stone bed course, first bed course 11 with the thickness sum of second bed course 12 is greater than 30cm, first bed course 11 with second bed course 12 all is equipped with the cross slope that the slope is greater than 3%. The particle size of the rock particles in the first mat layer 11 is greater than the particle size of the rock particles in the second mat layer 12 and the set cross slope is favorable for drainage.
As a specific implementation manner of the mountain highway subgrade structure in the narrow construction operation area provided by the embodiment of the present invention, please refer to fig. 1 to 3 together, the first cushion layer 11 and the second cushion layer 12 are all provided with geocells. The geocell is placed to increase the friction force between gravel rocks and improve the stability of the roadbed.
As a specific implementation manner of the mountain highway subgrade structure in the narrow construction operation area provided by the embodiment of the present invention, please refer to fig. 1 to 3 together, wherein the stone 21 is large-particle-size hard rock; the fluid material 22 is foamed light soil or liquid fly ash, and the proportion of the stone material 21 to the fluid material 22 in the mixed filler layer is 1: 1. The stone 21 and the fluid material 22 are evenly mixed and then spread and poured, a grid of 6.0m multiplied by 6.0m is manually made in the stone road foundation section by lime, and the large stone 21 is put into the grid for spreading and filling.
As an embodiment of the utility model provides a concrete implementation mode of narrow construction operation district mountain road roadbed structure please refer to in the lump and draw in fig. 1 to fig. 3, roadbed bottom 1 with fill out stone road base layer 2 department of meeting is equipped with prevention of seepage geotechnological cloth 5, roadbed bottom 1 deviates from one side of filling out stone road base layer 2 is equipped with geotechnological cloth 6 that permeates water. Firstly, a layer of permeable geotextile 6 is laid on the foundation, then the geocell is placed, gravel is added into the geotextile, and finally a layer of impermeable geotextile 5 is laid. The layer should be such that the fluid material 22 is more than 30cm away from the ground or surface water.
As an embodiment of the utility model provides a concrete implementation mode of narrow construction work area mountain road bed structure please refer to and draw together fig. 1 to fig. 3, the width of road bed bordure soil 4 is less than 2m, every layer the thickness of road bed bordure soil 4 all is less than 30 cm. In order to prevent the loss of the fluid material 22 (coal ash), the construction of the roadbed covering soil 4 is required, and the filling width of the covering soil is calculated according to the roadbed slope.
As an embodiment of the present invention, please refer to fig. 1 to 3 together for a specific implementation manner of a mountain highway subgrade structure in a narrow construction operation area, the connection portion 3 is in the shape of a right step.
As an embodiment of the present invention, please refer to fig. 1 to 3 together for a specific implementation manner of a mountain highway subgrade structure in a narrow construction operation area, the stone-filled roadbed 2 has 3-6 layers, and the thickness of each layer is smaller than 30 cm. Generally, 4-5 layers of the stone-filled roadbed 2 are poured, and the thickness of each layer is ensured to be less than 30 cm.
The utility model discloses a construction method of narrow construction operation district mountain area highway roadbed structure, including following step:
s1, treating the foundation, wherein the foundation of the site before filling is free of virtual slag, floating soil and accumulated water, and is tamped and leveled, and the foundation of the roadbed is compacted to a compaction degree not less than 93% before filling;
and S2, constructing the roadbed bottom layer 1, namely a gravel cushion. Firstly, a layer of permeable geotextile 6 is laid on the foundation, then the geocell is placed, gravel is added into the geotextile, and finally a layer of impermeable geotextile 5 is laid. The bed should be such that the fly ash is greater than 30cm away from the ground or surface water. The layer is made into a cross slope which drains water to two sides and is more than 3 percent, so as to be beneficial to draining water;
and S3, constructing the roadbed tipping soil 4. In order to prevent the loss of the fly ash, the construction of the roadbed edge-covering soil 4 is required, and the edge-covering soil filling width is calculated according to the roadbed slope. Marking filling boundary lines of covering soil at two sides on the filled and compacted gravel cushion layer, paving the covering soil according to the boundary lines, wherein the average width of the covering soil at two sides is not less than 2m, and the compaction thickness of each layer is not more than 30 cm. Because the construction operation area is narrower, the soil can be loaded by a walking tractor, and the soil can be leveled manually and compacted to be carried out together with the stone-filled roadbed 2. The roadbed tipping soil 4 is compacted by layered filling, and the filling height needs to be more than 60cm of the height of the liquid fly ash.
S4, filling the large stone 21 and the fluid filler. Manually beating a 6.0m multiplied by 6.0m grid in the stone road foundation section by lime, and placing the large stone 21 into the grid for paving and filling. Then pouring the fluid filler such as liquid fly ash, wherein the free-falling height of the fluid filler is not more than 2m, if the free-falling height of the fluid filler is more than 2m, constructing by using a diversion trench, filling and compacting fine soil on two sides of the roadbed after the filler reaches a certain strength, then placing the large-particle-size stone 21, and then pouring the fluid filler. And (3) pouring in layers, taking the pouring height of 1 m as a unit, preserving for 2-3 days once pouring, and pouring the concrete for the next time after the natural strength is formed. Attention needs to be paid to the fact that the pouring thickness of each layer of the liquid fly ash is 1-2 times of the thickness of each layer of the super-large crushed stone.
And S5, constructing the roadbed top surface according to the construction method.
In conclusion, the large stones 21 are not required to be processed in the construction process, the large stones 21 are directly placed into the grids for paving and then filled into the roadbed, and the time and labor are saved and the construction cost is low. And in addition, in the filling process, a flowable material, such as foamed light soil, liquid fly ash and the like is added, so that the strength and the overall stability of the roadbed can be greatly improved, the construction is not limited by regions, and the service life of the road is prolonged. The liquid fly ash is preferably mixed by a forced mixer, the mixture is liquid, construction joints cannot be caused by discontinuous construction, and the strength cannot be greatly influenced when the consistency fluctuation range is 1-3 seconds. The mixed filler has the advantages of light dead weight, high strength, self-compaction and easy construction, and the defect that the mountain highway subgrade in the original narrow construction operation area is inconvenient for large-scale mechanical operation during filling is overcome. Meanwhile, the construction method is simple and feasible, economic and environment-friendly, and has strong practical application value and social benefit for reducing the post-construction settlement of the roadbed in the later period.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. The utility model provides a narrow construction operation district mountain area highway roadbed structure which characterized in that: comprises a roadbed bottom layer and a stone-filled roadbed layer which are arranged from bottom to top in sequence; the roadbed bottom layer comprises a first cushion layer and a second cushion layer which are arranged from bottom to top in sequence; the stone-filled roadbed is a mixed filler layer which is a mixture of stones and fluid materials, and the stone-filled roadbed comprises a plurality of layers which are arranged in a stacked mode; the roadbed bottom layer and the longitudinal two ends of the stone-filled roadbed are provided with step-shaped connecting parts for connecting adjacent roadbed structures.
2. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: the roadbed bottom layer with the both ends of filling stone road bed layer all are equipped with a plurality of layers of roadbed bordures soil, every layer the roadbed bordures soil and all fills the compaction.
3. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: the first cushion layer is a large-particle conglomerate stone cushion layer, the second cushion layer is a small-particle conglomerate stone cushion layer, the sum of the thicknesses of the first cushion layer and the second cushion layer is larger than 30cm, and the first cushion layer and the second cushion layer are both provided with cross slopes with the gradient larger than 3%.
4. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: geocell is arranged in the first cushion layer and the second cushion layer.
5. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: the stone is large-particle-size hard rock; the fluid material is foamed light soil or liquid fly ash, and the proportion of the stone material to the fluid material in the mixed filler layer is 1: 1.
6. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: the road bed bottom with it is equipped with prevention of seepage geotechnological cloth to fill stone roadbed layer department of meeting, the road bed bottom deviates from one side of filling stone roadbed layer is equipped with the geotechnological cloth that permeates water.
7. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 2, wherein: the width of the roadbed tipping soil is less than 2m, and the thickness of each layer of the roadbed tipping soil is less than 30 cm.
8. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: the connecting part is in a positive step shape.
9. The mountain road roadbed structure in the narrow construction operation area, as recited in claim 1, wherein: the stone-filled road base layer is 3-6 layers, and the thickness of each layer is less than 30 cm.
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| CN201920528809.XU CN209975287U (en) | 2019-04-18 | 2019-04-18 | Mountain area highway subgrade structure in narrow construction operation area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134763A (en) * | 2021-11-30 | 2022-03-04 | 中铁第四勘察设计院集团有限公司 | Short-circuit foundation structure of embankment and construction method thereof |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114134763A (en) * | 2021-11-30 | 2022-03-04 | 中铁第四勘察设计院集团有限公司 | Short-circuit foundation structure of embankment and construction method thereof |
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