CN218147593U

CN218147593U - Old semi-rigid base asphalt pavement anti-crack reinforcing pavement structure

Info

Publication number: CN218147593U
Application number: CN202222051287.3U
Authority: CN
Inventors: 吴超凡; 李会安; 余宏波; 李鹏辉
Original assignee: XI'AN CHANGDA HIGHWAY MAINTENANCE TECHNOLOGY CO LTD
Current assignee: XI'AN CHANGDA HIGHWAY MAINTENANCE TECHNOLOGY CO LTD
Priority date: 2022-08-05
Filing date: 2022-08-05
Publication date: 2022-12-27
Anticipated expiration: 2032-08-05

Abstract

The utility model relates to a highway engineering technical field, concretely relates to anti reinforcement road surface structure that splits of old semi-rigid basic unit bituminous paving. The method aims to solve the problem of reflecting crack diseases in the existing semi-rigid base asphalt pavement repairability maintenance engineering. The technical scheme adopted by the utility model comprises that the road structure is retained on the original road surface after the surface layer is milled, and the upper surface of the road structure retained on the original road surface after the surface layer is milled is sequentially provided with a synchronous macadam seal layer and a surface layer from bottom to top; grouting holes are drilled at the crack positions of the original road surface where the road structure is reserved after the surface layer is milled, and a composite anti-cracking layer is arranged at the top of the crack of the original road surface where the road structure is reserved after the surface layer is milled. The service life of the road can be prolonged, and the driving comfort of the road is improved.

Description

Old semi-rigid base asphalt pavement anti-crack reinforcing pavement structure

Technical Field

The utility model relates to a highway engineering technical field, concretely relates to anti reinforcement road surface structure that splits of old semi-rigid basic unit bituminous paving.

Background

From the eighties of the last century, most of expressways, national provinces and municipal roads in China adopt semi-rigid base layers, and because the semi-rigid base layers are not provided with expansion joints, when the strain generated by dry shrinkage and temperature shrinkage exceeds the deformation resistance of the material per se or the multiple expansion and contraction deformation of the dry shrinkage and the temperature shrinkage exceeds the fatigue life of the material per se, the semi-rigid base layers can crack; and the block is large, the expansion and shrinkage deformation amount of the end part of the block exceeds the tensile strain of the asphalt paving layer material or the expansion and shrinkage deformation of the end part of the block exceeds the fatigue life of the asphalt paving layer, and further the reflection crack of the asphalt pavement can be caused. Rainwater oozes the back along the crack and gathers in impervious basic unit or road surface structural layer and road bed, causes under the vehicle load effect the purlin thick liquid of basic unit, the interlayer to come to nothing, and the road bed is wet soft, and then forms vertical shear deformation, and aggravation road surface damages, seriously influences road driving travelling comfort.

In the maintenance process, a large amount of construction waste is generated by adopting patching treatment, and the dust is large, so that the environment is not protected; if the cold regeneration treatment of cement is adopted, the crack of the regenerated cement base layer caused by self drying shrinkage, temperature shrinkage and the like further causes the crack of the asphalt overlay; once the asphalt overlay cracks, the regenerated cement stabilized macadam base layer can be damaged by erosion and the like, such as slurry pumping, settlement and the like, and then enters the next vicious circle.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model discloses a solve the problem of reflection crack disease among the current semi-rigid base layer bituminous paving repairability maintenance engineering, provide an anti reinforcement road surface structure that splits of old semi-rigid base layer bituminous paving, can prolong road life, improve road driving travelling comfort.

In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides an anti reinforcement road surface structure that splits of old semi-rigid base course bituminous paving which characterized in that: the method comprises the steps that a road structure is reserved on an original pavement after a surface layer is milled, and a synchronous chip seal layer and a surface layer are sequentially arranged on the upper surface of the road structure reserved on the original pavement after the surface layer is milled from bottom to top; grouting holes are drilled at the crack positions of the original road surface where the road structure is reserved after the surface layer is milled, and a composite anti-cracking layer is arranged at the top of the crack of the original road surface where the road structure is reserved after the surface layer is milled.

Furthermore, geopolymers are poured into the grouting holes.

Furthermore, the composite anti-cracking layer is formed by compounding high-strength carbon fiber cloth.

Further, the high-strength carbon fiber cloth is sprayed with high-viscosity emulsified asphalt at the bottom of the high-strength carbon fiber cloth.

Furthermore, the composite anti-cracking layer is connected with the original pavement in an anchoring mode along the crack direction of the reserved road structure after the surface layer of the pavement is milled and planed.

Further, the surface layer is an asphalt surface layer, and the additional paving mode is preventive maintenance of micro-surfacing and the like, or functional repair maintenance of an additional paving asphalt concrete surface layer.

Further, the thickness of the high-strength carbon fiber cloth is not more than 1mm.

Furthermore, the aperture of the grouting hole is 20cm, and the depth of the grouting hole is 5-10 cm below the original pavement disease area. Compared with the prior art, the utility model has the advantages of as follows and effect:

1) The utility model discloses exist to original road surface basic unit and take off the sky and loose disease adopts geopolymer slip casting reinforcement punishment. The geopolymer grouting material has the following advantages:

(1) ultra-high fluidity and permeability: the geopolymer grouting material can enter micro gaps through filling, permeation and compaction, so that road subgrade, base course and pavement damage can be repaired, and the overall strength of a pavement structure can be enhanced;

(2) activating inert materials in the base course or subgrade fill: inert silica and alumina in the foundation layer or the roadbed filling can be activated by the alkali activator and have polymerization reaction with the roadbed and the mineral active ingredients in the foundation layer, so that the geopolymer grouting material and the foundation layer or soil form a stone body, and the bearing capacity of the road is improved;

(3) strong anti-scouring capability: the geopolymer grouting material has compact structure, no shrinkage and strong water scouring resistance after reaction.

2) The utility model discloses synthesize punishment to old semi-rigid basic unit bituminous paving, add and spread the compound anti-crack layer of carbon cloth that excels in, can make the road surface have better anti-crack performance, durability.

3) The utility model discloses road surface structure realizes durability or long-life bituminous paving maintenance and repair.

Drawings

Fig. 1 is a schematic structural view of the present invention;

description of the labeling: 1-reserving the road structure after milling and planing the surface layer of the original pavement, 2-a composite anti-cracking layer, 3-a synchronous chip seal layer, 4-a surface layer, 5-cracks and 6-grouting holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The utility model provides an anti-crack reinforced pavement structure of an old semi-rigid base asphalt pavement, which comprises a pavement structure 1, a composite anti-crack layer 2, a synchronous macadam seal layer 3, a surface layer 4, a crack 5 and a grouting hole 6 which are reserved on the original pavement after a surface layer is milled; as shown in fig. 1;

the geopolymer grouting reinforcement treatment old semi-rigid base asphalt surface layer 1 is a road structure reserved after the surface layer of an original pavement of an old road is milled, the original pavement base has the defects of void and loose, a special detection technology is adopted to accurately position the void and loose area, and the void is eliminated and the loose base is reinforced through the geopolymer grouting reinforcement treatment.

The original pavement is retained on the upper surface of the road structure 1 after the surface layer is milled, and a synchronous chip seal layer 3 and a surface layer 4 are sequentially arranged on the upper surface from bottom to top; grouting holes 6 are drilled in the cracks 5 of the original road surface reserved in the road structure 1 after the surface layer is milled, and geopolymers are poured into the grouting holes 6; a composite anti-cracking layer 2 is arranged on the top of a crack 5 reserved on the road structure 1 after the original pavement is subjected to milling and planing on the surface layer.

The composite anti-cracking layer 2 is formed by spraying high-viscosity emulsified asphalt along the crack area of the old semi-rigid base asphalt surface layer, adhering high-strength carbon fiber cloth with the thickness not more than 1mm, and anchoring the high-strength carbon fiber cloth along the crack direction; the anchoring method comprises the steps of arranging 30mm by 30mm flexible rubber sheets on the high-strength carbon fiber cloth at a distance of 20cm along the crack direction, and using a nail gun to launch nails with the length of about 50mm to fix the flexible rubber sheets and the high-strength carbon fiber cloth in the crack area of the pavement.

The surface layer 4 is an asphalt surface layer, and the additional paving mode is preventive maintenance of micro-surface and the like, or functional repair maintenance of additionally paving a layer of asphalt concrete surface layer.

The utility model discloses the work progress of structure does: on an old semi-rigid base asphalt pavement with cracks 5, a pavement visual maintenance platform is relied on, and special detection technologies such as ground penetrating radar, falling weight deflectometer FWD and the like are combined to accurately position a structural layer void and loose area, holes are distributed along the cracks in a 'T' shape, a ground polymer grouting hole 6 is drilled, the hole diameter is 20mm, the hole depth is 5-10 cm below a damage area of a penetrating structural layer, and a ground polymer grouting material is selected as the grouting material. After the geopolymer grouting reinforcement treatment is completed, a milling machine is adopted to mill the whole section of the old semi-rigid base asphalt pavement, and usually only the surface layer is milled. The method comprises the steps of reserving a road structure 1 after milling and planing a surface layer of an original road surface, cleaning the road structure, spraying high-viscosity emulsified asphalt in a crack area, spraying the high-viscosity emulsified asphalt with the spraying amount of 0.7-1.2 kg/m & lt 2 & gt and the spraying width of about 50cm, paving high-strength carbon fiber cloth, arranging flexible rubber sheets with the thickness of 30mm/30mm at the distance of 20cm, and using a nail gun to shoot nails with the length of about 50mm to fix the flexible rubber sheets and the high-strength carbon fiber cloth in the crack area of the road surface. After the high-strength carbon fiber cloth composite anti-cracking layer 2 is constructed, the synchronous broken stone seal layer 3 is timely spread, rubber asphalt is adopted as asphalt, and the spreading amount is 1.4-1.6 kg per square meter, so that the uniform spreading of the asphalt is ensured; before spreading, the macadam is heated in a mixing station and is pre-coated with 5 per mill of asphalt; the spreading amount of the broken stones is controlled to be 12-14 kg per square meter, and the aggregate coverage rate is 50-70%. And after the synchronous chip seal 3 is constructed, paving an asphalt concrete surface layer 4. Finish in the bituminous paving repairability maintenance through above step the utility model discloses anti reinforcement road surface structure that splits of old semi-rigid basic unit bituminous paving.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims

1. The utility model provides an anti reinforcement road surface structure that splits of old semi-rigid base course bituminous paving which characterized in that: the method comprises the steps that a road structure (1) is reserved on an original pavement after a surface layer is milled, and a synchronous chip seal layer (3) and a surface layer (4) are sequentially arranged on the upper surface of the road structure (1) reserved on the original pavement after the surface layer is milled from bottom to top; grouting holes (6) are drilled in the positions of cracks (5) reserved in the road structure (1) after the surface layer of the original pavement is milled, and a composite anti-cracking layer (2) is arranged at the tops of the cracks (5) reserved in the road structure (1) after the surface layer of the original pavement is milled.

2. The crack-resistant reinforced pavement structure for the old semi-rigid base asphalt pavement according to claim 1, which is characterized in that: the grouting holes (6) are filled with geopolymers.

3. The crack-resistant reinforced pavement structure for the old semi-rigid base asphalt pavement according to claim 1 or 2, which is characterized in that: the composite anti-cracking layer (2) is formed by compounding high-strength carbon fiber cloth.

4. The crack-resistant reinforced pavement structure with the old semi-rigid base layer asphalt pavement as claimed in claim 3, wherein: the high-strength carbon fiber cloth is formed by spraying high-viscosity emulsified asphalt at the bottom of the high-strength carbon fiber cloth.

5. The crack-resistant reinforced pavement structure with the old semi-rigid base layer asphalt pavement as claimed in claim 4, wherein: the composite anti-cracking layer (2) is connected with the original road surface in an anchoring manner along the crack direction of the reserved road structure (1) after the surface layer of the road surface is milled.

6. The anti-cracking reinforced pavement structure of the old semi-rigid base asphalt pavement according to claim 5, characterized in that: the surface layer (4) is an asphalt surface layer, and the additional paving mode is preventive maintenance of micro-surfacing and the like, or functional repair maintenance of an additional paving asphalt concrete surface layer.

7. The anti-cracking reinforced pavement structure of the old semi-rigid base asphalt pavement according to claim 6, characterized in that: the thickness of the high-strength carbon fiber cloth is not more than 1mm.

8. The crack-resistant reinforced pavement structure with the old semi-rigid base layer asphalt pavement as claimed in claim 7, wherein: the diameter of the grouting hole (6) is 20cm, and the hole depth is 5-10 cm below the original pavement damage area.