LU505061B1 - Semi rigid base anti-crack pavement structure and construction method suitable for cold regions - Google Patents
Semi rigid base anti-crack pavement structure and construction method suitable for cold regions Download PDFInfo
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- LU505061B1 LU505061B1 LU505061A LU505061A LU505061B1 LU 505061 B1 LU505061 B1 LU 505061B1 LU 505061 A LU505061 A LU 505061A LU 505061 A LU505061 A LU 505061A LU 505061 B1 LU505061 B1 LU 505061B1
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- semi rigid
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- basalt fiber
- fiber strips
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- 238000010276 construction Methods 0.000 title claims abstract description 41
- 239000010410 layer Substances 0.000 claims abstract description 258
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 161
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 92
- 239000011241 protective layer Substances 0.000 claims abstract description 21
- 239000002344 surface layer Substances 0.000 claims abstract description 20
- 239000004568 cement Substances 0.000 claims description 42
- 239000004575 stone Substances 0.000 claims description 42
- 239000004744 fabric Substances 0.000 claims description 39
- 229910000831 Steel Inorganic materials 0.000 claims description 38
- 239000010959 steel Substances 0.000 claims description 38
- 239000010426 asphalt Substances 0.000 claims description 35
- 239000000203 mixture Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000002657 fibrous material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/16—Reinforcements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ
Abstract
The present invention discloses a semi rigid base anti-crack pavement structure and construction method suitable for cold regions, which includes a semi rigid base, a semi rigid base, and a surface layer laid sequentially from bottom to top on a roadbed. A first permeable layer is laid between the semi rigid base and the semi rigid base, a protective layer is laid between the semi rigid base and the surface layer, and a reinforcing layer is laid inside the semi rigid base and integrated with it, and the reinforcing layer includes multiple basalt fiber strips laid parallel and equidistant along the length direction of the road surface, and the semi rigid base includes a semi rigid lower base and a semi rigid upper base.
Description
DESCRIPTION LU505061
SEMI RIGID BASE ANTI-CRACK PAVEMENT STRUCTURE AND
CONSTRUCTION METHOD SUITABLE FOR COLD REGIONS
The present invention belongs to the technical field of semi rigid base anti-crack pavement construction, and specifically relates to a semi rigid base anti-crack pavement structure and construction method suitable for cold regions.
Semi rigid base asphalt pavement is currently the main form of pavement structure for high-grade highways in China, characterized by high strength, good flatness, and good fatigue resistance. In addition, its good board properties are conducive to construction mechanization and low engineering cost, providing strong support for transportation infrastructure construction. However, with the widespread application of semi rigid base in China, it has been found that there are serious cracks, which have become the main defect of this structure. Semi rigid materials, due to their inherent material and structural characteristics, are highly sensitive to temperature and humidity.
Therefore, during the formation and use of strength, temperature shrinkage cracks and dry shrinkage cracks inevitably occur due to temperature changes and moisture content changes. The cracking of semi rigid materials often extends to the surface layer to form reflective cracks, and the existence of cracks not only reduces the driving quality of vehicles, but also damages the integrity and continuity of the road structure, and to a certain extent leads to the weakening of structural strength. Due to the large temperature difference between day and night, long and cold winters in the northern regions of China, areas with an average temperature below zero and a temperature difference of 15°C in the coldest month belong to cold regions.
The problem of cracks in semi rigid base asphalt pavement is particularly severëU505061 and temperature shrinkage cracks are also more severe. Therefore, it is very necessary to optimize the existing semi rigid base pavement structure to solve the problem of cracks in the semi rigid base pavement and improve the durability of the pavement.
The technical problem to be solved by the present invention is to provide a semi rigid base anti-crack pavement structure suitable for cold regions, which is novel and reasonable in design. It actively resists the cracking of the semi rigid base through basalt fiber strips, thereby preventing or delaying the generation of reflection cracks. Compared with conventional crack resistance measures, it has better crack resistance effect and economic benefits, and is easy to promote and use.
To solve the above technical problems, the technical solution adopted by the present invention is: semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that: it includes a semi rigid subbase, a semi rigid base, and a surface layer laid sequentially from bottom to top on the roadbed, a first permeable layer is laid between the semi rigid subbase and the semi rigid base, a protective layer is laid between the semi rigid base and the surface layer, and a reinforcing layer is laid inside the semi rigid base, the reinforcing layer is integrated with a semi rigid base, which includes multiple basalt fiber strips laid parallel and equidistant along the length direction of the road surface. The semi rigid base includes a semi rigid lower base and a semi rigid upper base laid on the semi rigid lower base.
The above is applicable to the semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that the reinforcing layer is laid inside the semi rigid upper base and is integrated with the semi rigid upper base.
The above is applicable to the semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that the reinforcing layer is laid inside the semi rigid lower base and is integrated with the semi rigid lower base.
The above is applicable to the semi rigid base anti-crack pavement structutéJ505061 suitable for cold regions, characterized in that the number of the reinforcing layers is two, one of which is laid in the semi rigid lower base and integrated with the semi rigid lower base, and the other layer of which is laid in the semi rigid upper base and integrated with the semi rigid upper base.
The above is applicable to the semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that the protective layer includes a second permeable layer laid on the semi rigid base and a sealing layer laid on the second permeable layer. The first permeable layer and the second permeable layer are both emulsified asphalt permeable layers, and the sealing layer is a slurry sealing layer.
The above semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that the surface layer includes a lower layer, a middle layer, and an upper layer laid sequentially from bottom to top on the protective layer. The lower layer is the lower layer of ATB-25 asphalt mixture, the middle layer is the middle layer of AC-20 asphalt mixture, and the upper layer is the upper layer of SMA-13 asphalt mixture.
The above is applicable to semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that the thickness of the basalt fiber strip is 0.2mm-0.5mm, the width of the basalt fiber strip is 2cm—3cm, the number of basalt fiber strips is not less than two per meter of width, and the spacing between adjacent basalt fiber strips is 10cm—30cm.
Meanwhile, the present invention also discloses a construction method for semi rigid base anti-crack pavement suitable for cold regions, characterized in that the method comprises the following steps:
Step 1: Semi rigid subbase construction: mechanize the construction of the roadbed, use a dump truck to lay cement stabilized crushed stone on the roadbed, and use a paver to spread the cement stabilized crushed stone on the roadbed to form a semi rigid subbase;
Step 2: Construction of the first permeable layer: spray emulsified asphalt on the semi rigid base, and the emulsified asphalt penetrates into the semi rigid base to form the first permeable layer;
Step 3: Construction of semi rigid base and reinforcing layer: based on on-sité/505061 construction design, determine the position of the focal layer of force of the anti-crack pavement and the number of required reinforcing layers;
When a reinforcing layer needs to be laid and the position of the reinforcing layer is determined based on the height of the anti-crack pavement's focal layer of force in the semi rigid lower base, a dump truck is used to lay cement stabilized crushed stone on the semi rigid base with the first permeable layer. When laying the initial section of the road surface, multiple basalt fiber strips are tied side by side on the prefabricated steel truss, and the cloth belt machine is placed on the paver to adjust the height of the steel truss and the cloth belt machine, and tensioning the basalt fiber strip in advance to ensure it is smooth and in a tight state. Use a paver to pave the cement stabilized crushed stone on the first permeable layer to form a semi rigid lower base. At the same time, use a cloth belt machine to lay multiple basalt fiber strips, so that they are located within the semi rigid lower base. During the laying process of the basalt fiber strip, always maintain a tight state, and the basalt fiber strips are overlapped by stitching, insert steel nails at the overlapping position of two basalt fiber strips for fixation, and multiple basalt fiber strips arranged side by side form a reinforcing layer; then, a dump truck is used to dump cement stabilized crushed stone on the semi rigid lower base with a reinforcing layer, and a paver is used to pave the cement stabilized crushed stone on the semi rigid lower base to form a semi rigid upper base. The thickness of the semi rigid upper base and the semi rigid lower base is equal, and the semi rigid upper base and the semi rigid lower base form a semi rigid base, the reinforcing layer is integrated with the semi rigid base and forms a reinforced semi rigid base;
When a reinforcing layer needs to be laid and the reinforcing layer is located in the semi rigid upper base based on the height of the anti-crack road surface, a dump truck is used to lay cement stabilized crushed stone on the semi rigid subbase with the first permeable layer, and a paver is used to spread the cement stabilized crushed stone on the semi rigid subbase with the first permeable layer, forming a semi rigid lower base; then, a dump truck is used to lay cement stabilized crushed stone on the semi rigid lower base.
When laying the initial section of the road surface, multiple basalt fiber strips are tied)505061 side by side to the prefabricated steel truss, and the cloth belt machine is placed on the paver. The height of the steel truss and cloth belt machine are adjusted, and the basalt fiber strip is tensioned in advance to ensure smoothness and tension, use a paver to pave the cement stabilized crushed stone on the semi rigid lower base, forming a semi rigid upper base. At the same time, use a cloth belt machine to lay multiple basalt fiber strips, so that multiple basalt fiber strips are located within the semi rigid upper base.
During the laying process, the basalt fiber strips are always in a tight state. The basalt fiber strips are overlapped by stitching, and steel nails are inserted at the overlapping positions of the two basalt fiber strips for fixation, multiple basalt fiber strips arranged side by side form a reinforcing layer, with the thickness of the semi rigid upper base and the semi rigid lower base being equal. The semi rigid upper base and the semi rigid lower base form a semi rigid base, and the reinforcing layer is integrated with the semi rigid base and forms a reinforced semi rigid base;
When the reinforcing layer needs to be laid in two layers, cement stabilized crushed stone is paved on the semi rigid subbase with the first permeable layer using a dump truck. At the beginning of the pavement laying section, multiple basalt fiber strips are tied side by side on the prefabricated steel truss, and the cloth belt machine is placed on the paver. Based on the first layer of anti-crack pavement being located at the height of the semi rigid lower base, the height of the steel truss and the cloth belt machine are adjusted, and tensioning the basalt fiber strip in advance to ensure it is smooth and in a tight state. Use a paver to pave the cement stabilized crushed stone on the first permeable layer to form a semi rigid lower base. At the same time, use a cloth belt machine to lay multiple basalt fiber strips, so that they are located within the semi rigid lower base. During the laying process of the basalt fiber strip, always maintain a tight state, and the basalt fiber strips are overlapped by stitching, two basalt fiber strips are sewn and fixed with steel nails at the overlapping position. Multiple basalt fiber strips arranged side by side form a reinforcing layer, which is integrated with the semi rigid lower base and forms a reinforced semi rigid lower base; then, cement stabilized crushed stone is paved on the reinforced semi rigid lower base using a dump truck.
When laying the initial section of the road surface, multiple basalt fiber strips are tied sidé/505061 by side to the prefabricated steel truss, and the cloth belt machine is placed on the paver.
Based on the second layer of anti-crack road surface located at the height of the semi rigid upper base, the height of the steel truss and cloth belt machine are adjusted, and the basalt fiber strip is tensioned in advance to ensure smoothness, and in a taut state, use a paver to pave the cement stabilized crushed stone on the reinforced semi rigid lower base, forming a semi rigid upper base. At the same time, use a cloth belt machine to lay multiple basalt fiber strips, so that multiple basalt fiber strips are located within the semi rigid upper base. During the laying process of basalt fiber strips, they are always kept taut, and the basalt fiber strips are overlapped by stitching, two basalt fiber strips are sewn and fixed with steel nails at the overlapping position. Multiple basalt fiber strips arranged side by side form another reinforcing layer, which is integrated with the semi rigid upper base and forms a reinforced semi rigid upper base. The thickness of the reinforced semi rigid upper base and the reinforced semi rigid lower base are equal, and the semi rigid upper base and semi rigid lower base form a semi rigid base, the reinforced semi rigid upper base and the reinforced semi rigid lower base are integrated to form a reinforced semi rigid base;
Step 4: Construction of protective layer: sprinkle emulsified asphalt on the reinforced semi rigid base, penetrate the emulsified asphalt of the reinforced semi rigid base, and form a second permeable layer; spray slurry on the second permeable layer to form a sealing layer, and the second permeable layer and sealing layer form a protective layer;
Step 5: Construction of surface layer: pave the lower layer, middle layer, and upper layer from bottom to top on the protective layer to construct the surface layer. The lower layer is the lower layer of ATB-25 asphalt mixture, the middle layer is the middle layer of
AC-20 asphalt mixture, and the upper layer is the upper layer of SMA-13 asphalt mixture.
The above construction method is characterized in that the overlap length at tH&J505061 joint of the two basalt fiber strips in step three is 15cm—20cm; the thickness of the basalt fiber strip in step three is 0.2mm-0.5mm, and the width of the basalt fiber strip is 2cm— 3cm. The number of basalt fiber strips per meter of width is not less than two, and the spacing between adjacent basalt fiber strips is 10cm-30cm.
The above construction method is characterized in that the thickness of the basalt fiber strip is 0.3mm, the width of the basalt fiber strip is 2.5cm, the ultimate tensile stress of the basalt fiber strip with a thickness of 0.3mm and a width of 2.5cm is 1731N, and the elongation is 4.1%; calculating the tensile resilience modulus E, Poisson's ratio J, temperature shrinkage coefficient a and ultimate tensile stress ¢ of reinforced semi rigid base according to the formula,
E=EV,+EV,
H= pV, + ul,
LEV, +LEV, o=V,6, among them, the unit of tensile resilience modulus E of reinforced semi rigid base is
MPa, and the unit of the ultimate tensile stress o is N, Ep is the tensile resilience modulus of basalt fiber strip, in MPa, Ec is the tensile resilience modulus of semi rigid base, in
MPa, Vy is the volume fraction of basalt fiber strip in reinforced semi rigid base, and Ve is the volume fraction of semi rigid base in reinforced semi rigid base, u b is the Poisson's ratio’s ratio of basalt fiber strip, pc is the Poisson's ratio’s ratio of semi-rigid base course, ap is the temperature shrinkage coefficient of the basalt fiber strip, ac is the temperature shrinkage coefficient of the semi rigid base, op is the ultimate tensile stress of the basalt fiber strip, in N.
The present invention has the following advantages compared to prior art: LU505061 1. The semi rigid base anti-crack pavement structure adopted in the present invention is characterized by laying one or two reinforcing layers in the semi rigid base according to the height position of the anti-crack pavement’s focal layer of force. When a reinforcing layer is laid in the semi rigid base, the reinforcing layer can be located in the semi rigid upper base or the semi rigid lower base according to the height position of the focal layer of force of the anti-crack pavement; when two layers of reinforcement are laid in a semi rigid base, one layer of reinforcement can be located in the semi rigid upper base based on the height position of the first focal layer of force of the anti-crack road surface, and the other layer of reinforcement can be located in the semi rigid lower base based on the height position of the second focal layer of force of the anti-crack road surface. It has high strength, good flatness, good fatigue resistance, and good board properties, making it easy to promote and use. 2. The reinforcing layer of the semi rigid base anti-crack pavement structure adopted in the present invention is a series of basalt fiber strips arranged at intervals parallel to the length direction of the pavement and laid at equal intervals. The basalt fiber material has high strength, good insulation, light weight, and good fatigue resistance, which can resist the generation of temperature shrinkage cracks from the source, even if cracks inevitably occur in the later stage of operation, basalt fiber strips will still delay the propagation speed of cracks to a certain extent, and have better crack resistance and economic benefits compared to conventional crack resistance measures.
They are reliable, stable, and have good usage effects. 3. The method and steps adopted in the present invention are simple. By constructing a semi rigid base, a first permeable layer, a semi rigid base and a reinforcing layer, a protective layer, and a surface layer, the construction of a semi rigid base anti-crack pavement structure is achieved. Mechanized construction can ensure the quality of the project and ensure its anti-crack and anti-crack effect.
Among them, the construction of a semi rigid base and a reinforcing layer is based/505061 on the height position of the anti-crack pavement layer, by laying one or two reinforcing layers in a semi rigid base, when a reinforcing layer is laid in a semi rigid base, the reinforcing layer can be located in the semi rigid upper base or semi rigid lower base according to the height position of the anti-crack pavement’s adhesion layer; when two reinforcing layers are laid in the semi rigid base, one layer of reinforcing layer can be located in the semi rigid upper base based on the height position of the first focal layer of force of the anti-crack pavement, and the other layer of reinforcing layer can be located in the semi rigid lower base based on the height position of the second focal layer of force of the anti-crack pavement; when the reinforcing layer is combined with the semi rigid upper or lower base, the cloth belt machine is placed on the paver, the height of the steel truss and the cloth belt machine is adjusted, and the basalt fiber strip is tensioned in advance to ensure smoothness and tension. The semi rigid upper base and the reinforcing layer, or the semi rigid lower base and the reinforcing layer are laid simultaneously to form a reinforced semi rigid base, which is economical, practical, and easy to promote and use.
In summary, the design of the present invention is novel and reasonable. It actively resists the cracking of semi rigid bases through basalt fiber strips, thereby preventing or delaying the generation of reflection cracks. Compared with conventional crack resistance measures, it has better crack resistance effect and economic benefits, and is easy to promote and use.
The following provides a further detailed description of the technical solution of the present invention through the accompanying drawings and embodiments.
BRIEF DESCRIPTION OF THE FIGURES LU505061
Figure 1 is a structural schematic diagram of a semi rigid base anti-crack pavement structure in which a reinforcing layer is laid and the reinforcing layer is located within the semi rigid upper base of the present invention.
Figure 2 is a structural schematic diagram of a semi rigid base anti-crack pavement structure in which a reinforcing layer is laid and the reinforcing layer is located within the semi rigid lower base of the present invention.
Figure 3 is a structural schematic diagram of a semi rigid base anti-crack pavement structure with two layers of reinforcing layer laid in the present invention.
Figure 4 is a construction schematic diagram of the semi rigid base anti-crack pavement structure of the present invention.
Figure 5 is a flowchart of the construction method of the present invention.
Explanation of attached drawing markings: 1- Surface layer; 2- Protective layer; 3- Semi rigid base; 3-1- Semi rigid upper base; 3-2- Semi rigid lower base; 4- Basalt fiber strip; 5- Permeable layer; 6- Semi rigid subbase; 7- Roadbed; 8- Steel truss; 9- Cloth belt machine; 10- Paver; 11- Dump truck.
As shown in Figures 1 to 3, the semi rigid base anti-crack pavement structure suitable for cold regions described in the present invention includes a semi rigid subbase 6, a semi rigid base 3, and a surface layer 1 laid sequentially from bottom to top on the roadbed 7. A first permeable layer 5 is laid between the semi rigid subbase 6 and the semi rigid base 3, a protective layer 2 is laid between the semi rigid base 3 and the surface layer 1, and a reinforcing layer is laid inside the semi rigid base 3, the reinforcing layer is integrated with the semi rigid base 3, which includes multiple basalt fiber strips 4 laid parallel and equidistant along the length direction of the road surface.
The semi rigid base 3 includes the semi rigid lower base 3-2 and the semi rigldJ505061 upper base 3-1 laid on the semi rigid lower base 3-2.
It should be noted that based on the height position of the focal layer of force of the anti-crack pavement, one or two layers of reinforcing layer are laid in the semi rigid base 3. When one layer of reinforcing layer is laid in the semi rigid upper base 3-1, as shown in Figure 1, the reinforcing layer is laid in the semi rigid upper base 3-1 and is integrated with the semi rigid upper base 3-1. The reinforcing layer can be located in the semi rigid upper base 3-1 according to the height position of the focal layer of force of the anti-crack pavement; alternatively, as shown in Figure 2, the reinforcing layer is laid within the semi rigid lower base 3-2 and integrated with the semi rigid lower base 3-2.
The reinforcing layer can be located in the semi rigid lower base 3-2 based on the height position of the anti-crack pavement's focal layer of force; when two layers of reinforcing layers are laid in the semi rigid base 3, as shown in Figure 3, the number of the reinforcing layers is two. One layer of reinforcing layer is laid in the semi rigid lower base 3-2 and integrated with the semi rigid lower base 3-2. The other layer of reinforcing layer in the two layers is laid in the semi rigid upper base 3-1 and integrated with the semi rigid upper base 3-1, one layer of reinforcing layer can be located in the semi rigid upper base 3-1 based on the height of the first focal layer of force of the anti-crack road surface, and the other layer of reinforcing layer can be located in the semi rigid lower base 3-2 based on the height of the second focal layer of force of the anti-crack road surface. It has high strength, good flatness, good fatigue resistance, and good board properties. The reinforcing layer is composed of multiple basalt fiber strips 4 arranged at intervals parallel and equidistant along the length direction of the road surface, basalt fiber material has high strength, good insulation, light weight, and good fatigue resistance, which can resist the generation of temperature shrinkage cracks from the source. Even if cracks inevitably occur in the later stage of operation, basalt fiber strip 4 will still delay the expansion speed of cracks to a certain extent, thereby preventing or delaying the generation of reflection cracks. Compared with conventional crack resistance measures, it has better crack resistance effect and economic benefits.
In this embodiment, the protective layer 2 includes a second permeable layer laid drJ505061 a semi rigid base 3 and a sealing layer laid on the second permeable layer. The first permeable layer 5 and the second permeable layer are both emulsified asphalt permeable layers, and the sealing layer is a slurry sealing layer.
In this embodiment, the surface layer 1 includes a lower layer, a middle layer, and an upper layer laid sequentially on the protective layer 2 from bottom to top. The lower layer is the lower layer of ATB-25 asphalt mixture, the middle layer is the middle layer of
AC-20 asphalt mixture, and the upper layer is the upper layer of SMA-13 asphalt mixture.
In this embodiment, the thickness of basalt fiber strip 4 is 0.2mm-0.5mm, the width of basalt fiber strip 4 is 2cm-3cm, the number of basalt fiber strips 4 is not less than two per meter of width, and the spacing between adjacent basalt fiber strips 4 is 10cm— 30cm.
In practical use, based on the ability to achieve high tensile strength while maximizing cost control, it is preferred that the thickness of basalt fiber strip 4 is 0.3mm and the width of basalt fiber strip 4 is 2.5cm.
A construction method for a semi rigid base anti-crack pavement suitable for cold regions, as shown in Figures 4 and 5, is characterized in that the construction method comprises the following steps:
Step 1: Semi rigid subbase construction: mechanize the construction of roadbed 7, use a dump truck 11 to pave cement stabilized crushed stone on roadbed 7, and use a paver 10 to pave the cement stabilized crushed stone on roadbed 7 to form a semi rigid subbase 6;
Step 2: Construction of the first permeable layer: sprinkle emulsified asphalt on the semi rigid subbase 6, and the emulsified asphalt penetrates into the semi rigid subbase 6 to form the first permeable layer 5;
Step 3: Construction of semi rigid base and reinforcing layer: based on on-site construction design, determine the position of the focal layer of force of the anti-crack pavement and the number of required reinforcing layers;
When a reinforcing layer needs to be laid and the position of the reinforcing layer i8J505061 determined to be located in the semi rigid lower base 3-2 based on the height of the anti-crack road surface, cement stabilized crushed stone is laid on the semi rigid subbase 6 with the first permeable layer 5 using a dump truck 11. When laying the initial section of the road surface, multiple basalt fiber strips 4 are tied side by side on the prefabricated steel truss 8, and the cloth belt machine 9 is placed on the paver 10, adjust the height of steel truss 8 and the height of fabric conveyor 9, and tensioning the basalt fiber strip 4 in advance to ensure smoothness and tension. Use the paver 10 to pave the cement stabilized crushed stone on the first permeable layer 5, forming a semi rigid lower base 3-2. At the same time, use fabric conveyor 9 to lay multiple basalt fiber strips 4, so that multiple basalt fiber strips 4 are located within the semi rigid lower base 3-2, during the laying process of basalt fiber strip 4, it is kept in a tight state at all times. The basalt fiber strip 4 is overlapped by stitching, and two basalt fiber strips 4 are fixed by inserting steel nails at the overlapping position. Multiple basalt fiber strips 4 are arranged side by side to form a reinforcing layer; then, use a dump truck 11 to dump cement stabilized crushed stone on the semi rigid lower base 3-2 with a reinforcing layer, and use a paver 10 to pave the cement stabilized crushed stone on the semi rigid lower base 3-2 to form a semi rigid upper base 3-1. The thickness of the semi rigid upper base 3-1 is equal to that of the semi rigid lower base 3-2, and the semi rigid upper base 3-1 and the semi rigid lower base 3-2 form a semi rigid base 3, the reinforcing layer is integrated with the semi rigid base 3 and forms a reinforced semi rigid base;
When a reinforcing layer needs to be laid and the position of the reinforcing layer is determined to be in the semi rigid upper base 3-1 based on the height of the anti-crack pavement, a dump truck 11 is used to lay cement stabilized crushed stone on the semi rigid subbase 6 with the first permeable layer 5, and a paver 10 is used to pave the cement stabilized crushed stone on the semi rigid subbase 6 with the first permeable layer 5, forming a semi rigid lower base 3-2; then, use a dump truck 11 to lay cement stabilized crushed stone on the semi rigid lower base 3-2.
When laying the initial section of the road surface, tie multiple basalt fiber strips LAJ505061 side by side onto the prefabricated steel truss 8, place the fabric conveyor 9 on the paver 10, adjust the height of the steel truss 8 and the fabric conveyor 9, and pre tighten the basalt fiber strip 4 to ensure smoothness and tension, use a paver 10 to pave the cement stabilized crushed stone on the semi rigid lower base 3-2, forming a semi rigid upper base 3-1. At the same time, use a cloth belt machine 9 to lay multiple basalt fiber strips 4, so that multiple basalt fiber strips 4 are located within the semi rigid upper base 3-1.
During the laying process, the basalt fiber strips 4 are always in a tight state. The basalt fiber strips 4 are overlapped by stitching, and steel nails are inserted at the overlapping positions of the two basalt fiber strips 4, multiple basalt fiber strips 4 are arranged side by side to form a reinforcing layer. The thickness of the semi rigid upper base 3-1 is equal to that of the semi rigid lower base 3-2. The semi rigid upper base 3-1 and the semi rigid lower base 3-2 form a semi rigid base 3. The reinforcing layer is integrated with the semi rigid base 3 and forms a reinforced semi rigid base;
When the reinforcing layer needs to be laid in two layers, cement stabilized crushed stones are laid on the semi rigid subbase 6 with the first permeable layer 5 using a dump truck 11. When laying the initial section of the road surface, multiple basalt fiber strips 4 are tied side by side to the prefabricated steel truss 8, and the cloth belt machine 9 is placed on the paver 10. According to the first focal layer of force of the anti-crack road surface located at the height of the semi rigid lower base 3-2, the height of the steel truss 8 and the cloth belt machine 9 are adjusted, and tension the basalt fiber strip 4 in advance to ensure it is smooth and in a tight state. Use a paver 10 to pave the cement stabilized crushed stone on the first permeable layer 5, forming a semi rigid lower base 3-2. At the same time, use a cloth conveyor 9 to lay multiple basalt fiber strips 4, so that multiple basalt fiber strips 4 are located within the semi rigid lower base 3-2. During the laying process, the basalt fiber strip 4 is always in a tight state, the basalt fiber strip 4 is overlapped by stitching, and two basalt fiber strips 4 are fixed by inserting steel nails at the overlapping position.
Multiple basalt fiber strips 4 are arranged side by side to form a reinforcing laydrJ505061 which is integrated with the semi rigid lower base 3-2 and forms a reinforced semi rigid lower base; then, cement stabilized crushed stone is paved on the reinforced semi rigid lower base using a dump truck 11. When laying the initial section of the road surface, multiple basalt fiber strips 4 are tied side by side to the prefabricated steel truss 8, and the cloth belt machine 9 is placed on the paver 10. According to the second layer of anti-crack road surface located at the height of 3-1 on the semi rigid upper base, the height of the steel truss 8 and the cloth belt machine 9 are adjusted, and the basalt fiber strip 4 is pre tensioned, make it smooth and in a tight state. Use a paver 10 to pave the cement stabilized crushed stone on the reinforced semi rigid lower base, forming a semi rigid upper base 3-1. At the same time, use a cloth belt machine 9 to lay multiple basalt fiber strips 4, so that multiple basalt fiber strips 4 are located within the semi rigid upper base 3-1. During the laying process, the basalt fiber strips 4 are always in a tight state, and the basalt fiber strips 4 are overlapped by stitching, two basalt fiber strips 4 are sewn and fixed with steel nails at the overlapping position. Multiple basalt fiber strips 4 are arranged side by side to form another reinforcing layer, which is integrated with the semi rigid upper base 3-1 and forms a reinforced semi rigid upper base. The thickness of the reinforced semi rigid upper base and the reinforced semi rigid lower base is equal, and the semi rigid upper base 3-1 and the semi rigid lower base 3-2 form a semi rigid base 3, the reinforced semi rigid upper base and the reinforced semi rigid lower base are integrated to form a reinforced semi rigid base;
In this embodiment, the overlap length at the seam overlap position of the two basalt fiber strips 4 in step 3 is 15cm—20cm; the thickness of basalt fiber strip 4 in step 3 is 0.2mm-0.5mm, and the width of basalt fiber strip 4 is 2cm-3cm. The number of basalt fiber strips 4 is not less than two per meter of width, and the spacing between adjacent basalt fiber strips 4 is 10cm-30cm.
Step 4: Construction of protective layer: sprinkle emulsified asphalt on tH&J505061 reinforced semi rigid base, penetrate the emulsified asphalt of the reinforced semi rigid base, and form a second permeable layer; spray slurry on the second permeable layer to form a sealing layer, and the second permeable layer and sealing layer form a protective layer 2;
Step 5: Construction of the surface layer: Pave the lower layer, middle layer, and upper layer from bottom to top on protective layer 2, and construct surface layer 1. The lower layer is the ATB-25 type asphalt mixture lower layer, the middle layer is the AC-20 type asphalt mixture middle layer, and the upper layer is the SMA-13 type asphalt mixture upper layer.
In this embodiment, it is preferred that the thickness of basalt fiber strip 4 is 0.3mm, the width of basalt fiber strip 4 is 2.5cm, and the ultimate tensile stress of basalt fiber strip 4 with a thickness of 0.3mm and a width of 2.5cm is 1731N, with an elongation of 4.1%; calculating the tensile resilience modulus E, Poisson's ratio J, temperature shrinkage coefficient a and ultimate tensile stress ¢ of reinforced semi rigid base according to the formula,
E=EV,+EV,
H= pV, + ul,
LEV, +LEV, o=V,0, wherein the unit of the tensile resilience modulus E of reinforced semi rigid base is
MPa, and the unit of the ultimate tensile stress o is N, Ep is the tensile resilience modulus of basalt fiber strip 4 in MPa, Ec is the tensile resilience modulus of semi rigid base 3 in
MPa, Ve is the volume fraction of basalt fiber strip 4 in the reinforced semi rigid base, and
Ve is the volume fraction of semi rigid base 3 in the reinforced semi rigid base, Up is the
Poisson's ratio of basalt fiber band 4, uc is the Poisson's ratio's ratio of semi-rigid base course 3, ap is the temperature shrinkage coefficient of basalt fiber band 4, ac is the temperature shrinkage coefficient of semi rigid base 3, Op is the ultimate tensile stress 68505061 basalt fiber band 4, in N.
The above is only a preferred embodiment of the present invention and does not impose any limitations on it. Any simple modifications, changes, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention still fall within the scope of protection of the technical solution of the present invention.
Claims (10)
1. A semi rigid base anti-crack pavement structure suitable for cold regions, characterized in that: it includes a semi rigid subbase 6, a semi rigid base 3, and a surface layer 1 laid sequentially from bottom to top on a roadbed 7, a first permeable layer 5 is laid between the semi rigid subbase 6 and the semi rigid base 3, a protective layer 2 is laid between the semi rigid base 3 and the surface layer 1, and reinforcing layer is laid inside the semi rigid base 3, and the reinforcing layer is integrated with the semi rigid base 3, and the reinforcing layer includes multiple basalt fiber strips 4 laid parallel and equidistant along the length direction of the road surface, and the semi rigid base 3 includes a semi rigid lower base 3-2 and a semi rigid upper base 3-1 laid on the semi rigid lower base 3-2.
2. The semi rigid base anti-crack pavement structure suitable for cold regions as claimed in claim 1, is characterized in that the reinforcing layer is laid within the semi rigid upper base 3-1 and is integrated with the semi rigid upper base 3-1.
3. The semi rigid base anti-crack pavement structure suitable for cold regions as claimed in claim 1, is characterized in that the reinforcing layer is laid within the semi rigid lower base 3-2 and is integrated with the semi rigid lower base 3-2.
4. The semi rigid base anti-crack pavement structure suitable for cold regions as claimed in claim 1, characterized in that the number of the reinforcing layers is two, and one of the two layers of the reinforcing layers is laid within the semi rigid lower base 3-2 and integrated with the semi rigid lower base 3-2, and the other layer of the two reinforcing layers is laid within the semi rigid upper base 3-1 and integrated with the semi rigid upper base 3-1.
5. The semi rigid base anti-crack pavement structure suitable for cold regions &$/505061 claimed in claim 1, characterized in that the protective layer 2 comprises a second permeable layer laid on the semi rigid base 3 and a sealing layer laid on the second permeable layer, and the first permeable layer 5 and the second permeable layer are both emulsified asphalt permeable layers, and the sealing layer is a slurry sealing layer.
6. The semi rigid base anti-crack pavement structure suitable for cold regions as claimed in claim 1, characterized in that the surface layer 1 comprises a lower layer, a middle layer, and an upper layer laid sequentially from bottom to top on the protective layer 2, and the lower layer is the lower layer of ATB-25 asphalt mixture, the middle layer is the middle layer of AC-20 asphalt mixture, and the upper layer is the upper layer of SMA-13 asphalt mixture.
7. The semi rigid base anti-crack pavement structure suitable for cold regions as claimed in claim 1, characterized in that the thickness of the basalt fiber strip 4 is 0.2 mm to 0.5 mm, the width of the basalt fiber strip 4 is 2 cm to 3 cm, the number of basalt fiber strips 4 is not less than two per meter of width, and the spacing between adjacent basalt fiber strips 4 is 10 cm to 30 cm.
8. À construction method using the structure as claimed in claim 1 for a semi rigid base anti-crack pavement suitable for cold regions, characterized in that the construction method comprises the following steps: step 1: construction of semi rigid subbase: mechanizing the construction of the roadbed 7, using a dump truck 11 to pave cement stabilized crushed stone on the roadbed 7, and using a paver 10 to pave the cement stabilized crushed stone on the roadbed 7 to form a semi rigid subbase 6; step 2: construction of first permeable layer: spraying emulsified asphalt on the semi rigid subbase 6, and the emulsified asphalt penetrates into the semi rigid subbase 6 to form a first permeable layer 5;
step 3: construction of semi rigid base and reinforcing layer: based on on-sitéJ505061 construction design, determining the position of the focal layer of force of the anti-crack pavement and the number of required reinforcing layers;
when a reinforcing layer needs to be laid and the position of the reinforcing layer is determined based on the height of the anti-crack road surface’s focal layer of force in the semi rigid lower base 3-2, the dump truck 11 is used to lay cement stabilized crushed stone on the semi rigid subbase 6 with the first permeable layer 5, and when laying the initial section of the road surface, multiple basalt fiber strips 4 are tied side by side on a prefabricated steel truss 8, and a cloth belt machine 9 is placed on the paver 10, adjusting the height of the steel truss 8 and the height of the cloth belt machine 9, and tensioning the basalt fiber strip 4 in advance to ensure smoothness and tension, and using the paver 10 to pave the cement stabilized crushed stone on the first permeable layer 5, forming a semi rigid lower base 3-2, and at the same time, use the cloth belt machine 9 to lay multiple basalt fiber strips 4, so that the multiple basalt fiber strips 4 are located within the semi rigid lower base 3-2, and during the laying process of basalt fiber strips 4, they are kept in a tight state at all times, and the basalt fiber strips 4 are overlapped by stitching, and two basalt fiber strips 4 are fixed by inserting steel nails at the overlapping position, and multiple basalt fiber strips 4 are arranged side by side to form a reinforcing layer; then, the dump truck 11 is used to dump cement stabilized crushed stone on the semi rigid lower base 3-2 with a reinforcing layer, and the paver 10 is used to pave the cement stabilized crushed stone on the semi rigid lower base 3-2 to form a semi rigid upper base 3-1, and the thickness of the semi rigid upper base 3-1 and the semi rigid lower base 3-2 is equal, and the semi rigid upper base 3-1 and the semi rigid lower base 3-2 form a semi rigid base 3, and the reinforcing layer is integrated with the semi rigid base 3 and forms a reinforced semi rigid base;
when a reinforcing layer needs to be laid and the position of the reinforcing layer is determined based on the height of the anti-crack pavement’s focal layer of force in the semi rigid upper base 3-1, the dump truck 11 is used to lay cement stabilized crushed stone on the semi rigid subbase 6 with the first permeable layer 5, and the paver 10 is used to spread the cement stabilized crushed stone on the semi rigid subbase 6 with the first permeable layer 5, forming a semi rigid lower base 3-2; then, using the dump trudkJ505061 11 to lay cement stabilized crushed stone on the semi rigid lower base 3-2, and when laying the initial section of the road surface, tying multiple basalt fiber strips 4 side by side onto the prefabricated steel truss 8, placing the cloth belt machine 9 on the paver 10, adjusting the height of the steel truss 8 and the cloth belt machine 9, and tensioning the basalt fiber strip 4 in advance to ensure smoothness and tension, and using a paver 10 to pave the cement stabilized crushed stone on the semi rigid lower base 3-2 to form a semi rigid upper base 3-1, and at the same time, using the cloth belt machine 9 to lay multiple basalt fiber strips 4, so that the multiple basalt fiber strips 4 are located within the semi rigid upper base 3-1, and the basalt fiber strips 4 are always in a tight state during the laying process, and the basalt fiber strips 4 are overlapped by stitching, two basalt fiber strips 4 are sewn and fixed with steel nails at the overlapping position, and multiple basalt fiber strips 4 are arranged side by side to form a reinforcing layer, and the thickness of the semi rigid upper base 3-1 and the semi rigid lower base 3-2 are equal, and the semi rigid upper base 3-1 and the semi rigid lower base 3-2 form a semi rigid base 3, and the reinforcing layer is integrated with the semi rigid base 3 and forms a reinforced semi rigid base;
when the reinforcing layer needs to be laid in two layers, the dump truck 11 is used to lay cement stabilized crushed stone on the semi rigid subbase 6 with the first permeable layer 5, and when laying the initial section of the road surface, multiple basalt fiber strips 4 are tied side by side on the prefabricated steel truss 8, and the cloth belt machine 9 is placed on the paver 10, and according to the first focal layer of force of the anti-crack road surface, it is located at the height of the semi rigid lower base 3-2, adjusting the height of the steel truss 8 and the height of the cloth belt machine 9, and tensioning the basalt fiber strip 4 in advance to ensure smoothness and tension, and using the paver 10 to pave the cement stabilized crushed stone on the first permeable layer 5, forming a semi rigid lower base 3-2, and at the same time, using the cloth belt machine 9 to lay multiple basalt fiber strips 4, so that the multiple basalt fiber strips 4 are located within the semi rigid lower base 3-2, and during the laying process, the basalt fiber strip 4 is kept in a tight state at all times, and the basalt fiber strip 4 is overlapped by stitching, and two basalt fiber strips 4 are fixed by inserting steel nails at the overlapping/505061 position, and multiple basalt fiber strips 4 are arranged side by side to form a reinforcing layer, which is integrated with the semi rigid lower base 3-2 and forms a reinforced semi rigid lower base; then, the dump truck 11 is used to lay cement stabilized crushed stone on the reinforced semi rigid lower base, and when laying the initial section of the road surface, multiple basalt fiber strips 4 are tied side by side to the prefabricated steel truss 8, and the cloth belt machine 9 is placed on the paver 10, and according to the second focal layer of force of the anti-crack road surface located at the height of the semi rigid upper base 3-1, the height of the steel truss 8 and the cloth belt machine 9 are adjusted, and tensioning the basalt fiber strip 4 in advance to ensure smoothness and a tight state, and using the paver 10 to pave the cement stabilized crushed stone on the reinforced semi rigid lower base, forming a semi rigid upper base 3-1, and at the same time, using a cloth belt machine 9 to lay multiple basalt fiber strips 4, so that the multiple basalt fiber strips 4 are located within the semi rigid upper base 3-1, and maintaining a tight state at all times during the laying process of the basalt fiber strip 4, and the basalt fiber strip 4 is overlapped by stitching, and two basalt fiber strips 4 are fixed by inserting steel nails at the overlapping position, and multiple basalt fiber strips 4 are arranged side by side to form another reinforcing layer, which is integrated with the semi rigid upper base 3-1 and forms a reinforced semi rigid upper base, and the thickness of the reinforced semi rigid upper base and the reinforced semi rigid lower base is equal, and the semi rigid upper base 3-1 and the semi rigid lower base 3-2 form a semi rigid base 3, and the reinforced semi rigid upper base is integrated with the reinforced semi rigid lower base and forms a reinforced semi rigid base;
step 4: construction of protective layer: sprinkling emulsified asphalt on the reinforced semi rigid base, penetrating the emulsified asphalt of the reinforced semi rigid base, and forming a second permeable layer; spraying slurry on the second permeable layer to form a sealing layer, and the second permeable layer and sealing layer form a protective layer 2;
step 5: construction of surface layer: paving the lower layer, the middle layer, and the upper layer from bottom to top on the protective layer 2, and constructing the surface layer 1, and the lower layer is the lower layer of ATB-25 asphalt mixture, the middle lay񻓥 is the middle layer of AC-20 asphalt mixture, and the upper layer is the upper layer of SMA-13 asphalt mixture.
9. The construction method according to claim 8, characterized in that in step 3, the overlap length at the seam overlap position of two basalt fiber strips 4 is 15 cm to 20 cm; the thickness of basalt fiber strips 4 in step 3 is 0.2 mm to 0.5 mm, and the width of basalt fiber strips 4 is 2 cm to 3 cm, and the number of basalt fiber strips 4 is not less than two per meter of width, and the spacing between adjacent basalt fiber strips 4 is 10 cm to 30 cm.
10. The construction method according to claim 9, characterized in that the thickness of the basalt fiber strip 4 is 0.3 mm, the width of the basalt fiber strips 4 is 2.5 cm, the ultimate tensile stress of the basalt fiber strips 4 with a thickness of 0.3 mm and a width of 2.5 cm is 1731N, and the elongation is 4.1%; calculating the tensile resilience modulus E, Poisson's ratio J, temperature shrinkage coefficient a and ultimate tensile stress ¢ of reinforced semi rigid base according to the formula, E=EV, +E, H= UV, + pb, LY, + EV, o=V,0, wherein the unit of the tensile resilience modulus E of reinforced semi rigid base is MPa, and the unit of the ultimate tensile stress o is N, Ep is the tensile resilience modulus of basalt fiber strips 4, in MPa, Ec is the tensile resilience modulus of semi rigid base 3, in MPa, Vp is the volume fraction of basalt fiber strips 4 in reinforced semi rigid base, Ve is the volume fraction of semi rigid base 3 in reinforced semi rigid base, pp is the Poisson's ratio of basalt fiber strips 4, pc is the Poisson’s ratio of semi rigid base course 3, op is the temperature shrinkage coefficient of basalt fiber strips 4, ac is the temperature shrinkad&/505061 coefficient of the semi rigid base 3, Ov is the ultimate tensile stress of basalt fiber strips 4, in N.
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| LU505061A LU505061B1 (en) | 2023-09-07 | 2023-09-07 | Semi rigid base anti-crack pavement structure and construction method suitable for cold regions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU505061A LU505061B1 (en) | 2023-09-07 | 2023-09-07 | Semi rigid base anti-crack pavement structure and construction method suitable for cold regions |
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2023
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