CN215164280U

CN215164280U - Road surface structure suitable for seasonally frozen soil area heavy load traffic highway additionally paves

Info

Publication number: CN215164280U
Application number: CN202120728650.3U
Authority: CN
Inventors: 张永涛; 华俊锋; 孙鹤; 刘元树
Original assignee: Road and Bridge International Co Ltd; China Communication North Road and Bridge Co Ltd
Current assignee: Road and Bridge International Co Ltd; China Communication North Road and Bridge Co Ltd
Priority date: 2021-04-11
Filing date: 2021-04-11
Publication date: 2021-12-14
Anticipated expiration: 2031-04-11

Abstract

The utility model discloses a road surface structure suitable for seasonally frozen soil area heavy traffic highway adds shop, be former road bed from bottom to top in proper order, former road surface and new shop structure, new shop's structure is laminated composite construction, be foam asphalt regeneration mixture layer from bottom to top in proper order, first functional layer, first asphalt mixture structural layer, the second functional layer, second asphalt mixture structural layer, third functional layer and third asphalt mixture structural layer, wherein, foam asphalt regeneration mixture layer adopts coarse grain formula or medium grain formula foam asphalt cold recycling plant to mix asphalt mixture, first functional layer is the rubble seal coat in step, second functional layer and third functional layer all are modified emulsified asphalt adhesion layer. The utility model discloses bearing capacity is strong, resources are saved, environmental protection is profitable, the cost is low.

Description

Road surface structure suitable for seasonally frozen soil area heavy load traffic highway additionally paves

Technical Field

The utility model belongs to the technical field of the road, concretely relates to road surface structure suitable for seasonally frozen soil area heavy load traffic highway adds shop.

Background

Seasonal frozen soil has a remarkable annual variation characteristic, and freezing generally begins from autumn and gradually begins to melt in spring. The damage to the asphalt pavement of the highway in the seasonally frozen soil area is more serious and faster than that in other areas, and the repair and maintenance work is heavy. By using traditional maintenance techniques, a huge amount of old road milling material must be produced. How to realize the reuse of the old materials, reduce the occupation of the waste materials on land resources and the damage to the environment and reduce the maintenance cost is a great challenge in the prior road technical field.

The cold regeneration technology of the foamed asphalt is to re-stabilize the waste pavement milling material by utilizing the asphalt foaming technology and form a pavement structure layer with certain pavement performance under the action of compaction force, and has the advantages of high utilization rate of the pavement milling material, good energy-saving and emission-reducing effects and the like. In the prior art, the main purpose of the foamed asphalt cold recycling pavement structure provided by patents CN202020361750.2, CN201921995587.9 and CN202020251663.1 is to solve the general problems of poor bearing capacity, long maintenance time, poor durability, difficult water drainage and insufficient durability of the pavement, and the foamed asphalt cold recycling pavement structure is not suitable for roads in seasonally frozen soil areas and is difficult to popularize and use in the seasonally frozen soil areas.

Disclosure of Invention

An object of the utility model is to the not enough that prior art exists, provide a road surface structure that is applicable to seasonally frozen soil area heavy load traffic highway adds shop, compromise structural stability and construction workability when improving seasonally frozen soil area old road surface and milling the waste material problem of recycling.

The technical scheme of the utility model as follows:

the utility model provides a road surface structure suitable for seasonally frozen soil area heavy load traffic highway adds shop, includes former road bed, former road pavement and newly spreads the structure, its characterized in that: the new paving structure is a layered composite structure, and the layered composite structure sequentially comprises a foamed asphalt regeneration mixture layer, a first functional layer, a first asphalt mixture structural layer, a second functional layer, a second asphalt mixture structural layer, a third functional layer and a third asphalt mixture structural layer from bottom to top; the foamed asphalt regeneration mixture layer is a coarse-grained or fine-grained foamed asphalt cold-regeneration plant-mixed mixture; the first functional layer is a synchronous chip seal layer, and the second functional layer and the third functional layer are both modified emulsified asphalt adhesive layers; the first asphalt mixture structure layer is an AC-25 hot-mixed asphalt mixture, the second asphalt mixture structure layer is an AC-20 hot-mixed asphalt mixture, and the third asphalt mixture structure layer is an AC-13 or SMA-13 hot-mixed asphalt mixture.

The utility model has the advantages that:

(1) by directly arranging the new paving structure on the top layer of the original pavement structure, the bearing capacity is high, the original pavement structure and materials are fully utilized, building waste is not generated, resources are saved, and the construction cost of highway engineering is reduced.

(2) The utility model discloses the foam asphalt regeneration layer that sets up has realized that the road surface mills the recovery of milling the waste material and recycles, has both avoided the abandonment to mill the material pile and has dug occupation and to the pollution of environment to the soil, has effectively reduced the consumption to natural resources such as gathering materials, pitch again, and the environmental protection is profitable.

(3) The utility model discloses a to seasonal frozen soil area heavy load traffic highway maintenance and provide, be favorable to the popularization and application of foam pitch cold recycling technique in seasonal frozen soil area, especially heavy load traffic highway maintenance.

Drawings

Fig. 1 is a schematic view of a road surface structure along the transverse direction of a road according to an embodiment of the present invention.

The meaning of the individual reference symbols in the figures is: 1. the original road subgrade; 2. the original road pavement; 3. newly paving a structure; 4. regenerating a mixed material layer by using foamed asphalt; 5. a first functional layer; 6. a first asphalt mixture structural layer; 7. a second functional layer; 8. a second asphalt mixture structural layer; 9. a third functional layer; 10. and a third asphalt mixture structural layer.

Detailed Description

The technical solution in the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the utility model provides a pavement structure suitable for additionally paving heavy-load traffic highways in seasonally frozen soil areas, which is used for highways and comprises an original road subgrade 1, an original road pavement 2 and a new pavement structure 3 from bottom to top; the new paving structure 3 is a layered composite structure and sequentially comprises a foamed asphalt regeneration mixture layer 4, a first functional layer 5, a first asphalt mixture structure layer 6, a second functional layer 7, a second asphalt mixture structure layer 8, a third functional layer 9 and a third asphalt mixture structure layer 10 from bottom to top.

The foamed asphalt regeneration mixed material layer 4 is prepared by coarse grain grading, the thickness is 11-18 cm, the main materials comprise 9.5-37.5 mm milling and planing material, 0-9.5 mm milling and planing material, 20-30 mm broken stone, 0-3 mm fine aggregate, mineral powder, cement and foamed asphalt, the weight of the milling and planing material accounts for 85-90% of the total weight of the mixed material, and the percentage of the addition of the foamed asphalt in the dry mass of the rest of the mixed material after being converted into pure asphalt is 2.8-3.0%. The thickness of the structural layer can be adjusted according to the road surface condition.

The first functional layer 5 is a synchronous gravel seal layer, adopts a natural gravel material, has the maximum gravel particle size not exceeding 10mm, and has the functions of water resistance, freeze protection, pollution prevention and the like; the second functional layer 7 and the third functional layer 8 are both SBR modified emulsified asphalt adhesive layers and have an adhesive effect between an upper structural layer and a lower structural layer.

The first asphalt mixture structural layer 6 is an AC-25 hot-mix asphalt mixture with the thickness of 6-8 cm; the second asphalt mixture structural layer 8 is an AC-20 hot-mix asphalt mixture with the thickness of 5-7 cm; the third asphalt mixture structure layer 10 adopts an AC-13 or SMA-13 hot-mix asphalt mixture with the thickness of 4 cm.

Claims

1. The utility model provides a road surface structure suitable for seasonally frozen soil area heavy load traffic highway adds shop, includes former road bed, former road pavement and newly spreads the structure, its characterized in that: the new paving structure is a layered composite structure, and the layered composite structure sequentially comprises a foamed asphalt regeneration mixture layer, a first functional layer, a first asphalt mixture structural layer, a second functional layer, a second asphalt mixture structural layer, a third functional layer and a third asphalt mixture structural layer from bottom to top; the foamed asphalt regeneration mixture layer is a coarse-grained or fine-grained foamed asphalt cold-regeneration plant-mixed mixture; the first functional layer is a synchronous chip seal layer, and the second functional layer and the third functional layer are both modified emulsified asphalt adhesive layers; the first asphalt mixture structure layer is an AC-25 hot-mixed asphalt mixture, the second asphalt mixture structure layer is an AC-20 hot-mixed asphalt mixture, and the third asphalt mixture structure layer is an AC-13 or SMA-13 hot-mixed asphalt mixture.

2. The pavement structure suitable for paving heavy-duty traffic roads in seasonally frozen soil areas according to claim 1, wherein: the thickness of the foamed asphalt regeneration mixture layer is 11-18 cm; the thickness of the first asphalt mixture structure layer is 6-8 cm; the thickness of the second asphalt mixture structure layer is 5-7 cm; the thickness of the third asphalt mixture structural layer is 4 cm.