Highway roadbed structure

Abstract

The utility model provides a highway subgrade structure which comprises an embankment and a roadbed, the roadbed is located above the embankment, the embankment is filled with crushed and screened building aggregates, the roadbed comprises a driving road bed and a hard shoulder road bed, the driving road bed is filled with powder improved plain soil obtained after the building aggregates are crushed, and the hard shoulder road bed is filled with powder improved plain soil obtained after the building aggregates are crushed. And the hard shoulder roadbed is filled with crushed and screened building aggregates. According to the utility model, the building aggregates are used for roadbed filling, so that the resource waste is reduced, and the construction cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of road construction, in particular to a highway roadbed structure. Background Art

[0002] The urbanization process generates a large amount of construction aggregate each year, as does the renovation and expansion of infrastructure (such as highways). According to incomplete statistics, despite the high value of construction aggregate, the sheer volume of this material results in a utilization rate of less than 10%. Much of this material is directly landfilled, resulting in a waste of resources.

[0003] The existing embankment requires a large amount of earthwork. The roadbed width is 21m, and the average embankment height is 4m. Each kilometer of embankment requires 108,000 cubic meters of earthwork, covering an area of ​​33,000 square meters. At the same time, current highway drainage is mostly constructed with building materials such as masonry or concrete. The production of these materials will generate a large amount of carbon emissions, pollute the environment, and increase construction costs. Utility Model Content

[0004] In view of the defects or deficiencies in the prior art, the utility model provides a highway roadbed structure, which uses building aggregates for roadbed filling, thereby reducing resource waste and lowering construction costs.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An embodiment of the present utility model provides a highway subgrade structure, including an embankment and a roadbed, wherein the roadbed is located above the embankment, and the embankment is filled with crushed and screened construction granular materials. The roadbed includes a driving roadbed and a hard shoulder roadbed, wherein the driving roadbed is filled with powder-modified soil obtained by crushing construction granular materials, and the hard shoulder roadbed is filled with crushed and screened construction granular materials.

[0007] Furthermore, the driving roadbed is located in the middle above the embankment, and the hard shoulder roadbeds are arranged on both sides of the driving roadbed.

[0008] Furthermore, a road surface is provided above the roadbed, and the road surface includes a driving lane road surface and a hard shoulder road surface. The driving lane road surface is located above the driving roadbed, and the hard shoulder road surface is located above the hard shoulder roadbed.

[0009] Furthermore, the pavement structure of the carriageway is, from top to bottom, as follows: mastic asphalt gravel mixture SMA-13, medium-grained modified asphalt concrete AC-20, coarse-grained asphalt concrete AC-25, large-size permeable modified asphalt mixture LSPM-25, cement-stabilized gravel and low-dose cement-stabilized gravel.

[0010] Furthermore, the thickness of the hard shoulder pavement is less than that of the driving lane pavement, and is consistent with the upper middle surface layer of the driving lane pavement structure, which is composed of, from top to bottom: mastic asphalt crushed stone mixture SMA-13, medium-grained modified asphalt concrete AC-20.

[0011] Furthermore, the embankment and the road surface are both overlapped by a step overlap method.

[0012] Furthermore, flat curbs are provided on both sides of the road surface, which are prefabricated from C20 concrete. A curb base is provided under the flat curb, which is cast-in-place from C15 concrete. The curb base is placed on the embankment.

[0013] Furthermore, side slopes are provided on both sides of the embankment, and the slope gradient is 1:1 to 1:1.3.

[0014] Furthermore, photovoltaic panels are provided on the slope, and a plurality of photovoltaic panels are provided. The plurality of photovoltaic panels cover the outer surface of the slope, and the photovoltaic panels are connected to the roadbed through expansion bolts.

[0015] Furthermore, a side ditch is provided at the foot of the slope, and the side ditch is composed of mortar-laid building aggregate.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The utility model fills the embankment with crushed and screened building granular materials, and fills the driving roadbed with powder-improved soil after crushing the building granular materials, thereby greatly reducing the use of earthwork, improving the utilization rate of building granular materials, avoiding resource waste, and reducing construction costs.

[0018] 2. The thickness of the hard shoulder pavement of the utility model is less than that of the driving lane pavement, and the hard shoulder pavement is consistent with the middle surface layer of the driving lane pavement structure, which reduces the construction cost compared with the traditional hard shoulder pavement and conventional pavement structure maintaining the same thickness.

[0019] 3. The utility model isomorphous that the side ditch is composed of mortar-laid building aggregates, thereby improving the utilization rate of the building aggregates and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the roadbed in the embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the slope structure in the embodiment of the utility model;

[0022] Among them, 1. Embankment; 2. Driving roadbed; 3. Hard shoulder roadbed; 4. Driving lane pavement; 5. Hard shoulder pavement; 6. Flat curb; 7. Curb base; 8. Slope; 9. Photovoltaic panel; 10. Ditch. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] A typical implementation of the present invention is as follows: Figure 1 and Figure 2 As shown, a highway subgrade structure includes a foundation, a roadbed is arranged above the foundation, and the roadbed includes an embankment 1 and a roadbed. The embankment 1 is located above the foundation, and the roadbed is located above the embankment 1. The embankment 1 is filled with crushed and screened building aggregate. When filling the building aggregate, the rolling settlement difference of each layer is required to be ≤2mm. The embankment 1 is overlapped in a step overlap manner, and the width of the embankment overlap step is not less than 40cm.

[0025] The roadbed includes a driving roadbed 2 and a hard shoulder roadbed 3. The driving roadbed 2 is located in the middle above the embankment 1, and the hard shoulder roadbed 3 is arranged on both sides of the driving roadbed 2. The driving roadbed 2 is filled with crushed construction aggregate powder-improved soil. The requirements for construction aggregate powder are: surface area ≥500㎡ / kg, and the requirements for improved soil are: CBR (California Bearing Ratio) ≥8, compaction degree ≥97%, and roadbed top rebound deflection ≥120 (0.01mm).

[0026] The hard shoulder roadbed 3 is filled with crushed and screened construction granular materials, so that the hard shoulder roadbed 3 has a certain water permeability effect.

[0027] By filling the embankment 1 with crushed and screened construction aggregates, and filling the driving roadbed 2 with powder-modified soil after crushing the construction aggregates, the use of earthwork is greatly reduced, the utilization rate of construction aggregates is improved, and resource waste is avoided.

[0028] A road surface is provided above the roadbed, and the cross slope of the road surface is 2%. The road surface includes a driving lane road surface 4 and a hard shoulder road surface 5. The driving lane road surface 4 is located above the driving roadbed 2, and the hard shoulder road surface 5 is located above the hard shoulder roadbed 3.

[0029] Among them, the pavement structure adopted by the driving lane pavement 4 is a multi-layer structure, which is composed of: 4cm mastic asphalt crushed stone mixture SMA-13, 6cm medium-grained modified asphalt concrete AC-20, 8cm coarse-grained asphalt concrete AC-25, 10cm large-size permeable modified asphalt mixture LSPM-25, 2×18cm cement-stabilized crushed stone and 18cm low-dose cement-stabilized crushed stone from top to bottom.

[0030] The thickness of the hard shoulder pavement 5 is less than that of the driving lane pavement 4, and it also adopts a multi-layer structure. From top to bottom, it consists of: 4 cm asphalt mastic crushed stone mixture SMA-13, 6 cm medium-grained modified asphalt concrete AC-20. The upper and middle surface layers of the hard shoulder pavement 5 are consistent with those of the driving lane pavement 4 for easy construction.

[0031] At the same time, compared with the traditional hard shoulder pavement that maintains the same thickness as the conventional pavement structure, the hard shoulder pavement structure described in the present invention can avoid waste of resources and reduce construction costs.

[0032] The pavement overlap adopts the step overlap method. The width of the surface layer overlap step shall not be less than 15cm, and the width of the base layer overlap step shall not be less than 25cm.

[0033] Flat curbs 6 are set on both sides of the road surface, which are prefabricated from C20 concrete. A curb base 7 is set under the flat curb 6, and the curb base 7 is cast in place from C15 concrete. The curb base 7 is placed on the embankment 1.

[0034] Slopes 8 are set on both sides of the embankment 1, and the slope 8 has a slope of 1:1~1:1.3. Photovoltaic panels 9 are set on the slope 8. There are multiple photovoltaic panels 9, and multiple photovoltaic panels 9 cover the outer surface of the slope 8. The photovoltaic panels 9 are connected to the roadbed through expansion bolts, and the expansion bolts penetrate into the construction aggregate to a depth of not less than 5 cm.

[0035] A side ditch 10 is provided at the foot of the slope 8. No rapids trough is provided on the slope 8. Water flows along the slope surface to the side ditch 10. The side ditch 10 is composed of mortar-laid building aggregates, thereby improving the utilization rate of the building aggregates and reducing the waste of resources.

[0036] Taking the roadbed top width of 21m and the roadbed height of 4m as an example, the construction method is as follows:

[0037] Step 1: First, clear the surface of the foundation by 30cm, then roll it, and the foundation compaction degree should be ≥91%;

[0038] Step 2: Fill the roadbed according to the cross-section design drawings of each pile;

[0039] Step 3: Let the roadbed stand for a period of ≥3 months, and the settlement rate of the top of the standard roadbed should be controlled to be ≤2mm / month.

[0040] Step 4: Simultaneously construct curbstones, drainage facilities, photovoltaic panels, etc., and finally construct the pavement structure.

[0041] The utility model uses construction aggregates for highway roadbed filling, and can consume an average of 102,400 cubic meters of construction aggregates per kilometer of embankment, which is equivalent to saving 102,400 cubic meters of soil resources and 34,133 square meters of earth borrow area; compared with conventional slopes, it saves 2,800 square meters of permanent land; and at the same time saves a large amount of cement concrete and asphalt concrete.

[0042] At the same time, it can produce 12,200 square meters of photovoltaic panels, generating a large amount of clean energy every year.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A highway subgrade structure, characterized in that: It includes an embankment and a roadbed. The roadbed is located above the embankment. The embankment is filled with crushed and screened construction granular materials. The roadbed includes a driving roadbed and a hard shoulder roadbed. The driving roadbed is filled with powder-improved soil obtained by crushing construction granular materials, and the hard shoulder roadbed is filled with crushed and screened construction granular materials.

2. A highway subgrade structure according to claim 1, characterized in that: The driving roadbed is located in the middle above the embankment, and the hard shoulder roadbeds are arranged on both sides of the driving roadbed.

3. A highway subgrade structure according to claim 2, characterized in that: A road surface is arranged above the roadbed, and the road surface includes a driving lane road surface and a hard shoulder road surface. The driving lane road surface is located above the driving roadbed, and the hard shoulder road surface is located above the hard shoulder roadbed.

4. A highway subgrade structure according to claim 3, characterized in that: The pavement structure of the carriageway is, from top to bottom, composed of: mastic asphalt gravel mixture SMA-13, medium-grained modified asphalt concrete AC-20, coarse-grained asphalt concrete AC-25, large-size permeable modified asphalt mixture LSPM-25, cement-stabilized gravel and low-dose cement-stabilized gravel.

5. A highway subgrade structure according to claim 4, characterized in that: The thickness of the hard shoulder pavement is less than that of the driving lane pavement, and is consistent with the upper middle surface layer of the driving lane pavement structure, which is composed of: asphalt mastic crushed stone mixture SMA-13 ​​and medium-grained modified asphalt concrete AC-20 from top to bottom.

6. A highway subgrade structure according to claim 3, characterized in that: The embankment and road surface are both joined in a stepped manner.

7. A highway subgrade structure according to claim 3, characterized in that: Flat curbs are provided on both sides of the road surface and are prefabricated from C20 concrete. A curb base is provided under the flat curb and is cast in situ from C15 concrete. The curb base is placed on the embankment.

8. The highway subgrade structure according to claim 1, characterized in that: Side slopes are provided on both sides of the embankment, and the slope ratio is 1:1 to 1:1.

3.

9. A highway subgrade structure according to claim 8, characterized in that: The slope is provided with a plurality of photovoltaic panels, which cover the outer surface of the slope and are connected to the roadbed via expansion bolts.

10. The highway subgrade structure according to claim 8, characterized in that: A side ditch is set at the foot of the slope, and the side ditch is made of mortar-laid building aggregate.

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