CN109763397B - Asphalt pavement with embedded structure and construction method - Google Patents
Asphalt pavement with embedded structure and construction method Download PDFInfo
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- CN109763397B CN109763397B CN201910179930.0A CN201910179930A CN109763397B CN 109763397 B CN109763397 B CN 109763397B CN 201910179930 A CN201910179930 A CN 201910179930A CN 109763397 B CN109763397 B CN 109763397B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 128
- 238000010276 construction Methods 0.000 title claims description 22
- 239000000203 mixture Substances 0.000 claims abstract description 73
- 239000004567 concrete Substances 0.000 claims abstract description 42
- 230000009471 action Effects 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- 239000010410 layer Substances 0.000 claims description 230
- 239000002344 surface layer Substances 0.000 claims description 85
- 238000007789 sealing Methods 0.000 claims description 52
- 239000011384 asphalt concrete Substances 0.000 claims description 22
- 239000004575 stone Substances 0.000 claims description 21
- 238000005096 rolling process Methods 0.000 claims description 19
- 239000002245 particle Substances 0.000 claims description 18
- 239000002002 slurry Substances 0.000 claims description 12
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- 239000003365 glass fiber Substances 0.000 claims description 7
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Road Paving Structures (AREA)
Abstract
The invention relates to a mosaic asphalt pavement structure, in particular to an asphalt pavement structure which can bear heavy traffic and has good rut resistance effect. The asphalt pavement layer is composed of an upper layer, a middle layer and a lower layer, the lower layer is of a net structure formed by compounding a geonet and concrete edge blocks, asphalt mixtures of the middle layer are embedded between gaps of the concrete edge blocks of the lower layer and the geonet, the concrete edge blocks have higher strength and structural stability, the bottom surface of a regular shape can provide a larger bearing surface, the pressure intensity to a base layer is reduced, the lower layer and the middle layer are mutually embedded to form an asphalt pavement structure with two layers of structures mutually embedded, the concrete edge blocks of the lower layer are limited by the traction of the geonet and the embedding of the asphalt mixtures of the middle layer, displacement and deformation are not easy to occur under the action of heavy traffic load, thicker asphalt mixtures are arranged at the gaps of the concrete edge blocks, the reflection of shrinkage cracks of the base layer can be resisted, and the bearing capacity of the asphalt pavement is improved from the structural aspect.
Description
Technical Field
The invention relates to an asphalt pavement with a jogged structure, belongs to the field of highway and urban road engineering, and in particular relates to an asphalt pavement structure which can bear heavy traffic and has good rut resistance effect.
Background
Asphalt pavement belongs to a flexible pavement structure, has the advantages of comfort in driving, low noise and the like, and is widely applied to roads and urban roads. According to the rules in the highway asphalt pavement design specification, the asphalt pavement structure layer consists of three parts: a surface layer, a base layer and a subbing layer. The road surface is not only required to bear the effect of wheel load, but also is required to be influenced by natural environment factors, and because of the influence of driving load and atmospheric factors on the road surface, the road surface is generally gradually weakened along with the depth, so that the road surface is generally of a multi-layer structure, materials with good quality are paved on an upper layer with larger stress, materials with slightly poor quality are paved on a lower layer with smaller stress, and therefore the road surface structural forms of a base layer, a base layer and a surface layer are respectively paved by adopting materials with different specifications and requirements on the road surface. The surface layer is positioned at the uppermost layer of the whole pavement structure, directly bears the repeated actions of the vertical force and the horizontal force of the running load and the vacuum suction force generated after the vehicle body, and is the layer which most directly reflects the pavement service performance, and meanwhile, the surface layer is most adversely affected by rainfall and air temperature change. Therefore, the facing should have higher structural strength, rigidity and high and low temperature stability, and be abrasion-resistant, water-impermeable, and also have good slip resistance and flatness on its surface, as compared to other layers. The surface layer of the common asphalt pavement is composed of two layers and three layers, the surface layer is called an abrasion layer and is used for resisting abrasion and loosening caused by horizontal force and suction force after wheels, the asphalt pavement can be paved by asphalt mastic broken stone mixture or asphalt concrete, the middle surface layer and the lower surface layer are main surface layers, and the main surface layers are main parts for ensuring the strength of the surface layers and are generally paved by asphalt concrete.
In the prior art, the subbase layer is usually cement-stabilized or lime-stabilized fine granules, such as cement-stabilized stone chips, lime soil and the like, and the base layer is usually cement-stabilized coarse granules, such as cement-stabilized macadam and the like. The number of layers of the asphalt surface layer is determined according to the load of the vehicle, and the light traffic and the medium traffic generally adopt a two-layer surface layer structure, and the heavy traffic and the extra heavy traffic adopt a three-layer surface layer structure. The thickness of each structural layer is calculated and determined according to the accumulated axle load equivalent of the automobile, and the roads of heavy traffic and extra heavy traffic generally adopt thicker structural layers and materials with higher strength. Under the condition of certain material strength, increasing the thickness is an effective way for improving the structural strength of the pavement, but too thick asphalt surface layers also cause some defects, the asphalt pavement structure is a flexible material, is a mixture formed by mixing broken stones with asphalt, is a combination of discrete materials, stones are inlaid with each other, the stones are bonded by asphalt to form a bearing structural layer, and the structural layer has higher vertical bearing capacity, but no constraint force exists between the stones, and has poorer bearing capacity of horizontal force. The flexible pavement material can deform under the action of load, when the load exceeds the bearable limit, stones are displaced, and diseases such as ruts, hugs and the like appear on the pavement, so that the phenomenon is serious at an intersection of urban roads. The heavy vehicle climbing wheels on the uphill road section generate larger horizontal friction force on the road surface, the flexible road surface has poorer capability of bearing horizontal force, and the road surface is also easy to damage. Under the action of load, the stone in the asphalt mixture downwards applies transmission force, the stone is irregularly shaped, the bottom area is smaller, larger pressure is generated on the lower part, the stone with the sharp edges on the lower layer is pressed on the base layer, the base layer is easy to damage, and the asphalt surface layer is damaged.
In addition, the cement stabilization base layer commonly used in the prior art belongs to a semi-rigid structure, and has some technical defects: because of the influence of thermal expansion and contraction of temperature, the temperature shrinkage crack generated by the cement stabilized base is unavoidable, and the reflection crack caused to the asphalt pavement becomes one of the most main factors influencing the service life of the road. In order to reduce shrinkage cracks of the cement-stabilized structural layer, the amount of cement used for the base layer is strictly limited, so that the low structural strength and impact fatigue resistance are limited. At present, the asphalt pavement is widely applied to the improvement of the concrete pavement by additionally paving an asphalt surface layer, but the concrete pavement is used as a base layer of the asphalt pavement, and original transverse seams and longitudinal seams are reflected to the asphalt surface layer to cause cracks of the asphalt surface layer, so that the technical problem that the additionally paving asphalt of the old concrete pavement is difficult to solve is solved.
The aggregate particle diameter of the surface layer asphalt mixture is increased, the thickness of the asphalt surface layer is increased, the bearing capacity of the asphalt surface layer can be improved, the reflection of shrinkage crack resistance can be resisted, but the structural stability of the surface layer which is too thick is correspondingly reduced, other diseases can be brought instead, the manufacturing cost of the asphalt mixture is higher, and the thickness of the asphalt surface layer can not be increased uniformly in practical engineering to solve the problem of damage of an asphalt pavement under heavy traffic.
Disclosure of Invention
The purpose of the invention is that: provided is an asphalt pavement with a jogged structure. The asphalt pavement structure mainly comprises an underlayment, a base layer, a sealing layer, an asphalt lower layer, an asphalt middle layer and an asphalt upper layer, wherein the lower layer is of a net structure formed by compounding a geonet and concrete edge blocks, the asphalt mixture of the middle layer is embedded between gaps of the concrete edge blocks of the lower layer and the geonet, the concrete edge blocks are equivalent to large-particle aggregate wrapped by the asphalt mixture of the middle layer and the sealing layer, the strength and the structural stability are high, and the lower layer and the middle layer are mutually embedded to form an asphalt pavement structure with mutually embedded two layers. The beneficial effects are as follows: the concrete edge blocks have higher strength, the regular shape bottom surface can provide a larger bearing surface, the pressure intensity to the base layer is reduced, the concrete edge blocks of the lower layer are limited by the traction of the geonet and the embedding of the middle-layer asphalt mixture, the displacement and the deformation are not easy to occur under the action of heavy traffic load, thicker asphalt mixture is arranged at the gaps of the concrete edge blocks, the reflection of shrinkage cracks of the base layer can be resisted, and the bearing capacity of the asphalt pavement is improved from the aspect of structural construction. The lower layer adopts the concrete precast block to replace most of asphalt mixture, so that the strength is increased, the manufacturing cost is reduced, the middle layer and the lower layer are rolled simultaneously, the rolling procedure of one layer is reduced, and the construction cost is reduced.
The invention is realized by the following technology: an asphalt pavement with a jogged structure mainly comprises a subbase layer 1, a base layer 2, a sealing layer 3, a lower layer 4, a middle surface layer 5 and an upper layer 6. The lower layer 4, the middle layer 5 and the upper layer 6 form an asphalt surface layer, wherein the lower layer 4 and the middle layer 5 are mutually embedded, the lower layer 4 is formed by compounding a structural net 9 and an embedded body 10, the structural net 9 is formed by compounding a geonet 7 and edge blocks 8, the structural net 9 and the embedded body 10 are arranged on the same layer surface of the lower layer 4, the embedded body 10 is an asphalt mixture which is embedded in the lower layer 4 and is positioned between gaps of the edge blocks 8, the embedded body 10 and the structure of the middle layer 5 are connected into a whole, the lower part of the embedded body 10 is contacted and adhered with the surface of the sealing layer 3, the lower part of the sealing layer 3 is adhered with the base layer 2, and the embedded asphalt pavement structure of the middle layer 5 is formed by embedding the asphalt mixture of the middle layer 5 into the gaps between the edge blocks 8 and the sealing layer 3.
The upper part of the shape of the prism block 8 is a regular octagonal frustum with a small upper part and a large lower part, the lower part of the prism block is a regular octagonal prism body, the upper top surface and the lower bottom surface of the prism block are regular octagons, the side surface of the upper part is 8 inclined trapezoid surfaces, the side surface of the lower part is eight rectangle surfaces, the inclination angle alpha of the trapezoid surfaces is 30-45 degrees, the distance W between two opposite sides of the lower bottom surface of the prism block 8 is 1-1.5 times of the thickness h3 of the lower layer 4, the lower edge height b is 0.5-1.5 times of the maximum broken stone particle size of the asphalt mixture of the middle layer 5, and the prism block 8 is formed by prefabricating concrete with the strength grade not lower than C35. The geotechnical net 7 is a bidirectional glass fiber geogrid, the mesh is 1 to 1.5 times of the maximum broken stone particle size of the asphalt mixture of the middle surface layer 5, and the bidirectional tensile strength is 30 to 120kN/m.
The structural net 9 is a net which is formed by uniformly arranging the edge blocks 8 on the geonet 7 in a square arrangement, the geonet 7 is anchored in the concrete of the edge blocks 8 when the edge blocks 8 are prefabricated, the edge blocks 8 are mutually pulled by the geonet 7, and the edge blocks 8 are limited to horizontally displace under the action of automobile load; the gap V between two adjacent edge blocks 8 arranged in square is 1-1.5 times of the maximum broken stone particle size of the asphalt mixture of the middle surface layer 5, the structural net 9 is a sheet finished product manufactured by a factory, each long peripheral edge geonet 7 extends out of the edge block 8 by the length of one gap V, and the structural net 9 sheet finished product is stacked and stacked in multiple layers and is firmly bound by plastic packing.
The structural net 9 is paved on the sealing layer 3, a wedge-shaped cavity 11 is formed between two adjacent edge blocks 8, a conical cavity 12 is formed between four edge blocks 8, the embedded body 10 is embedded into the wedge-shaped cavity 11 and the rectangular pyramid-shaped cavity 12 when the asphalt mixture of the middle surface layer 5 is paved, and the asphalt mixture is embedded into gaps of the edge blocks 8 through meshes of the geotechnical net 7 and is bonded with the base layer 3.
The construction method of the embedded structure asphalt pavement is basically the same as that of a conventional asphalt pavement, and the construction method of the embedded structure asphalt pavement is characterized in that the construction steps of the embedded structure asphalt pavement are as follows:
a. the roadbed is rolled, the roadbed is paved, and the subbase layer 1 and the base layer 2 are laminated as in the conventional pavement construction.
B. Spreading penetrating oil on the base layer 2 uniformly, spreading the sealing layer 3 in time after the penetrating oil is completely permeated, wherein the sealing layer 3 adopts emulsified asphalt slurry sealing layer, the slurry sealing layer is uniformly spread on the base layer 2 by a slurry sealing layer spreader, the spreader advances at a uniform speed of 1.5-3.0 km/h, and the spreading thickness is controlled to be 5-10 mm.
C. The structural mesh 9 sheets are paved on the sealing layer 3, the structural mesh 9 sheets stacked and piled are transported to a site to be paved by adopting a forklift, the structural mesh 9 sheets are manually matched and paved, the edge blocks 8 at the starting position are transversely paved from one side to the other side of the road, 20-30 mm away from the curb stone, gaps of 20-30 mm are reserved between the edge blocks 8 are reserved in transverse lap joint control of the sheets, the edge blocks 8 between sheet joints correspond to each other, and redundant edge blocks 8 of the structural mesh 9 are cut off at the curb stone position at the other side of the road; after one sheet is transversely paved, the subsequent structural nets 9 can be transversely and longitudinally paved at the same time, a gap of 20-30 mm is reserved between longitudinal and transverse sheets of the structural nets 9, the two geotechnical nets 7 connected with the sheets are fastened at intervals of 300-600 mm by adopting nylon tie wires, redundant tie wires are cut off, the structural nets 9 are connected into a whole, and the structural nets 9 of corresponding parts are cut off when the laid sheets meet inspection wells and water drops.
D. the structural net 9 is rolled by a road roller for one time, so that the prism blocks 8 are embedded in the sealing layer 3, and the sealing layer 3 at the positions of the wedge-shaped cavity 11 and the conical cavity 12 is slightly raised.
E. the structural mesh 9 is uniformly spread with the adhesive oil.
F. The edges of the edge blocks 8 are filled with asphalt mixture with the same particle size as the middle surface layer 5at the edge parts near the roadside and the edge of the inspection well, and are tamped by hand until the edges are flush with the top surfaces of the edge blocks 8.
G. According to the virtual paving coefficient determined by the test, the asphalt concrete mixture of the middle surface layer 5 is paved, the volume occupied by the wedge-shaped cavity 11 and the conical cavity 12 is considered during paving, the wedge-shaped cavity 11 and the conical cavity 12 are filled with the asphalt concrete mixture, and the asphalt mixture is paved at the same time on the upper part of the structural net 9.
H. The asphalt mixture of the middle surface layer 5 is rolled by a road roller, the asphalt mixture in the wedge-shaped cavity 11 and the cone-shaped cavity 12 is extruded and compacted under the rolling of the road roller while the road roller is rolled, an embedded body 10 of the middle surface layer 5 embedded into the lower surface layer 4 is formed, the periphery of the prism block 8 is tightly wrapped by the embedded body 10, the aggregate of the asphalt mixture is embedded into the meshes of the geonet 7, and the embedded body 10 is bonded with the sealing layer 3 through the structural net 9.
I. The middle surface layer 5 is uniformly spread with bonding oil.
J. Paving the asphalt concrete mixture of the upper layer 6.
K. and rolling the upper layer 6 asphalt concrete by adopting a road roller.
The invention starts from the composition structure of the pavement structure, improves the lower layer 4 and the middle layer 5 which play a bearing role on the surface layer, mutually embeds the two layers together, mutually holds the two layers, and reduces displacement deformation damage under the action of load. The sealing layer 3, the lower layer 4 and the middle layer 5 can be regarded as a layer of asphalt structure layer, the rib blocks 8 can be regarded as aggregate wrapped in asphalt, the upper parts of the rib blocks 8 adopt inclined planes to avoid corner damage under the action of load, the wedge-shaped cavities 11 and the cone-shaped cavities 12 are formed by the inclined planes, after asphalt mixture is filled, the rib blocks 8 are embedded more tightly under the rolling of a road roller, the rib blocks 8 are pulled by the geonet 7 and extruded by the embedded body 10, and the rib blocks are subjected to the action of horizontal force of braking and uphill wheels, so that the phenomenon of forming a hug rut due to the displacement of the aggregate can not occur. The rib blocks 8 are embedded in the sealing layer 3, and the load of the upper wheels is transmitted downwards to the base layer 2 through the rib blocks 8, so that the pressure intensity to the base layer 2 is greatly reduced by a large bearing surface, and the stress damage to the base layer 2 is avoided. The shrinkage cracks of the cement stabilizing materials of the base layer are formed by covering the edge blocks 8 on the larger bottom surface on the base layer 2 through the sealing layer 3, the shrinkage cracks of the base layer 2 cannot be reflected to the middle surface layer 5 and the upper surface layer 6 through the edge blocks 8, the gaps between the edge blocks 8 are filled by the compacted embedded bodies 10, the thickness is thicker, the edge blocks 8 are pulled by the geonet 7, the stress absorption effect is stronger, and the shrinkage cracks of the base layer 2 between the edge blocks 8 cannot be reflected to the upper surface layer 6. Therefore, the cement stabilizing material of the base layer 2 can relax the limit of the standard to the cement dosage, increase the cement dosage, improve the strength of the base layer and have important significance for prolonging the service life of heavy traffic and extra heavy traffic roads. The invention can also adopt two layers of surface layers, cancel the upper layer, directly use the middle surface layer to jogge with the lower surface layer, as the wearing layer of the road surface, used for the road of medium traffic and light traffic grade.
Drawings
FIG. 1 is a diagram of the construction of a pavement structure according to the present invention;
FIG. 2 is a plan view of a prism block;
FIG. 3 is an elevation view of a prism block;
FIG. 4 is a plan view of a structural web;
FIG. 5 is an elevation view of the structural web (taken along line A-A of FIG. 4);
FIG. 6 is a large sample of a wedge-shaped cavity (section B-B of FIG. 4);
FIG. 7 is a large view of a trapezoid space (section C-C of FIG. 4);
FIG. 8 is a large sample view of a wedge-shaped insert;
Fig. 9 is a large view of a trapezoidal insert.
In the figure: 1-underlayment, 2-basic unit, 3-seal, 4-lower floor, 5-middle floor, 6-upper floor, 7-geotechnical net, 8-arris piece, 9-structural net, 10-embedding body, 11-wedge cavity, 12-toper cavity.
Detailed Description
For a better understanding of the present invention, reference is made to fig. 1 to 9, which illustrate the present invention further, but do not limit the present invention.
The invention starts from the composition structure of the pavement structure, improves the lower layer 4 and the middle layer 5 which play a bearing role on the surface layer, mutually embeds the two layers together, mutually holds the two layers, and reduces displacement deformation damage under the action of load. The embedded structure asphalt pavement mainly comprises a base layer 1, a base layer 2, a sealing layer 3, a lower layer 4, a middle surface layer 5 and an upper layer 6, wherein the structure of the pavement structure is shown in figure 1. The lower layer 4, the middle layer 5 and the upper layer 6 form an asphalt surface layer, wherein the lower layer 4 and the middle layer 5 are mutually embedded, the lower layer 4 is formed by compounding a structural net 9 and an embedded body 10, the structural net 9 is formed by compounding a geotechnical net 7 and edge blocks 8, the structural net 9 and the embedded body 10 are arranged on the same layer surface of the lower layer 4, the embedded body 10 is an asphalt mixture which is embedded into the lower layer 4 and is positioned between gaps of the edge blocks 8, the embedded body 10 and the structure of the middle layer 5 are connected into a whole and are asphalt mixtures with the same particle size, the lower part of the embedded body 10 is contacted with and bonded to the surface of the sealing layer 3, the lower part of the sealing layer 3 is bonded to the base layer 2, and the embedded asphalt mixture of the middle layer 5 is embedded into gaps between the edge blocks 8 of the lower layer 4, and the edge blocks 8 are wrapped by the asphalt mixture of the middle layer 5 and the sealing layer 3.
The upper part of the shape of the prism block 8 is a regular octagonal frustum with a small upper part and a large lower part, the lower part is a regular octagonal prism body, the upper top surface and the lower bottom surface are regular octagons, the side surface of the upper part is 8 inclined trapezoid surfaces, the side surface of the lower part is eight rectangular surfaces, the inclination angle alpha of the trapezoid surfaces is 30-45 degrees, the upper part of the prism block 8 adopts an inclined surface, the corner damage under the action of load can be avoided, the wedge-shaped cavity 11 and the conical cavity 12 formed by the inclined surfaces are embedded more tightly under the rolling of the road roller after asphalt mixture is filled, and the compaction of the embedded body 10 is facilitated. The distance W between two opposite sides of the lower bottom surface of the prism block 8 is 1 to 1.5 times of the thickness h3 of the lower layer 4. The plane view of the prism block 8 is shown in fig. 2, and the elevation view of the prism block is shown in fig. 3. According to relevant specifications, the proper thickness of the medium-grain type AC-20 asphalt concrete structure layer is 60-100 mm, the proper thickness of the coarse-grain type AC-25 asphalt concrete structure layer is 80-120 mm, and the distance W between two opposite sides of the lower bottom surface of each rib block 8 is 80-160 mm according to factors such as manufacturing, transportation, construction and the like of a structural net 9, and the width-thickness ratio W/h 3 is controlled to be not more than 2, so that breakage and damage are not easy to occur due to the smaller width-thickness ratio. The height b of the lower edge of the edge block 8 is 0.5-1.5 times of the maximum crushed stone particle size of the asphalt mixture of the middle surface layer 5, the common AC-20 and AC-25 asphalt concretes of the middle surface layer and the lower surface layer are regulated according to relevant specifications, the nominal maximum particle sizes are 19mm and 26.5mm respectively, and the lower edge height b of the edge block 8 is preferably 10-30 mm and less than or equal to 1/h 3. The edge blocks 8 are prefabricated by concrete with the strength grade not lower than C35. The geotechnical net 7 is a two-way glass fiber geogrid, which is a net-shaped structure material prepared by adopting glass fiber alkali-free roving as a main raw material and adopting a certain braiding process, and the two-way tensile strength is 30-120 kN/m. The mesh of the geotechnical net 7 is 1-1.5 times of the maximum crushed stone particle size of the asphalt mixture of the middle surface layer 5, the pore diameter of the common glass fiber geotechnical grille is 12.7mm and 25.4mm, namely half inch and one inch, the glass fiber geotechnical grille with the pore diameter of 25.4mm is selected according to the particle size of the lower surface layer, and the glass fiber geotechnical grille with other pore diameters can be customized according to the requirement.
The structural net 9 is a net which is formed by uniformly arranging the edge blocks 8 on the geonet 7 in a square manner, the geonet 7 is anchored in the concrete of the edge blocks 8 when the edge blocks 8 are prefabricated, and is positioned at the lower half part of the edge blocks 8, the upper part of the structural layer is pressed and the lower part of the structural layer is pulled under the action of load, and the edge blocks 8 are mutually pulled by the geonet 7, so that the horizontal displacement of the edge blocks 8 under the action of automobile load is limited. The structural net 9 is seen in plan view in fig. 4, the structural net 9 is seen in elevation in fig. 5, and fig. 5 is taken along line A-A of fig. 4. The gap V between two adjacent edge blocks 8 arranged in square is 1-1.5 times of the maximum crushed stone particle size of the asphalt mixture of the middle surface layer 5, according to relevant specifications, the common AC-20 and AC-25 asphalt concrete of the middle surface layer and the lower surface layer have nominal maximum particle sizes of 19mm and 26.5mm respectively, and the gap V between two adjacent edge blocks 8 is preferably 20-30 mm. The structural net 9 is a sheet finished product manufactured by a factory, each long peripheral edge geonet 7 extends out of the edge block 8 by a gap V, binding between two sheets is facilitated during construction, and the structural net 9 sheet finished product is stacked and stacked in layers and is firmly bound by plastic packing belts.
The structural net 9 is laid on the sealing layer 3, a wedge-shaped cavity 11 is formed between two adjacent edge blocks 8, the large view of the wedge-shaped cavity 11 is shown in fig. 6, and fig. 6 is a section B-B of fig. 4. A conical cavity 12 is formed among the four edge blocks 8, the trapezoid space 12 is shown in a large scale in fig. 7, and fig. 7 is a section C-C of fig. 4. The embedded body 10 is embedded into the wedge-shaped cavity 11 and the rectangular pyramid-shaped cavity 12 when the asphalt mixture of the middle surface layer 5 is paved, the asphalt mixture is embedded into gaps of the edge blocks 8 through meshes of the geotechnical net 7, and the asphalt mixture is bonded with the base layer 3 through the sealing layer 3. The wedge-shaped insert 10 is shown in large scale in fig. 8, and the trapezoidal insert 10 is shown in large scale in fig. 9.
The sealing layer 3 adopts emulsified asphalt slurry sealing layer, which is formed by stirring emulsified asphalt, aggregate conforming to grading, water, filler and additive according to a certain design proportion into slurry mixture, uniformly spreading the slurry mixture on a pavement to be treated, and firmly combining the slurry mixture with the original pavement through the processes of wrapping, demulsification, water separation, evaporation, solidification and the like, thereby playing a good role of preventing water from penetrating into a base layer. The invention is provided with the sealing layer 3, and the sealing layer is used as a bonding layer and a leveling layer of the prism blocks 8 and the base layer 2, so that the contact surface of the prism blocks 8 and the base layer 2 is stable and can not generate tilting phenomenon. The seal layer 3, the lower layer 4 and the middle layer 5 can be regarded as a layer of asphalt structure layer, the rib blocks 8 can be regarded as aggregate wrapped in asphalt, the rib blocks 8 are pulled by the geonet 7 and extruded by the embedded body 10, and the rib blocks are acted by the horizontal force of the braking and ascending road wheels, so that the phenomenon that the aggregate displacement forms a hug track can not occur. The rib blocks 8 are provided with a large flat bottom surface, are embedded in the sealing layer 3, and downwards transmit to the base layer 2 through the rib blocks 8 under the load action of the upper wheels, so that the pressure intensity to the base layer 2 is greatly reduced by large bearing surfaces, and the stress damage to the base layer 2 is avoided. The base cement stabilizer shrinkage crack, the edge block 8 of great bottom surface covers on basic unit 2 through seal 3, the shrinkage crack of basic unit 2 can not reflect to middle surface course 5 and go up surface course 6 through edge block 8, the gap between the edge block 8 is filled by the embedding body 10 of compaction, the filler part bituminous mixture thickness is thicker, be pulled by geonet 7 between the edge block 8, have stronger stress absorption effect, the basic unit 2 shrinkage crack between the edge block 8 also can't reflect to last surface course 6, the cement stabilizer of basic unit 2 can relax the regulation to the cement quantity, increase the cement quantity, improve the intensity of basic unit 2, be favorable to increasing the service life of road.
The middle surface layer 5 can be made of middle-grain type AC-20 asphalt concrete or coarse-grain type AC-25 asphalt concrete, and the thickness h2 is 50-80 mm. The upper layer 6 can be made of medium-grain AC-16 asphalt concrete or MSA-13 asphalt mastic macadam, and the thickness h3 is 35-60 mm. If the road with medium traffic or light traffic grade is used, a two-layer surface layer is adopted, an upper surface layer 6 is omitted, a middle surface layer 5 is directly adopted as a pavement wearing layer, medium-grain AC-16 asphalt concrete or MSA-13 asphalt mastic macadam can be adopted, the two-layer surface layer structure is mutually embedded with a lower surface layer 4, and the thickness h2 is 35-60 mm.
The construction net 9 is manufactured by embedding the geonet 7 when prefabricating the concrete of the rib blocks 8. The die of the rib block 8 is divided into an upper part and a lower part, the upper die and the lower die are longitudinally and transversely arranged with a plurality of die holes according to the length and width of the mesh sheet of the structural mesh 9, the die holes of the lower die are regular eight-square prisms, the depth of the die holes is consistent with the height of the inclined part of the rib block 8, the die holes of the upper die are regular eight-square prisms, the depth of the die holes is 2-3 times of the height b of the lower edge of the rib block 8, the die holes are arranged according to the clearance V of the rib block 8, all the die holes of the lower die are connected into a whole, all the die holes of the upper die and the lower die are connected into a whole, the die holes of the upper die and the lower die can be combined and separated, the die holes of the upper die and the lower die correspond to each other during combination, and the number of the die holes of one group of dies is equal to the number of the rib blocks 8 of the structural mesh 9. The mould is inverted during prefabrication, namely the small surface of the regular eight-edge platform mould hole of the lower mould is arranged below, the bottom of each lower mould hole is provided with a stripper plate, and the lower mould is provided with an attached vibrator. The upper die is arranged on the lower die, a pressing plate is arranged corresponding to each upper die hole, and the lower surface of the pressing plate is concave and convex. And filling a proper amount of concrete into each die hole, wherein the concrete adopts fine concrete. The pressing plate is pressed into the upper die hole, the vibrator of the lower die vibrates, concrete vibrates tightly under the pressure of the pressing plate, the pressing plate and the upper die are lifted, concrete in the lower die hole is flush with the upper edge of the die hole, and the surface of the concrete is concave and convex. And the geotechnical net 7 is placed on the lower die, the upper die is combined on the lower die again, and cement paste is sprayed on the surface of the compacted concrete of the lower die, so that the cement paste is favorable for firmly combining with the secondarily filled concrete. And a proper amount of concrete is filled in the upper die holes, the concrete is filled in the convex-concave parts of the concrete which is poured once, the geonet 7 is embedded between the convex-concave parts, the pressing plate presses the vibrator to vibrate so as to make the concrete compact, and the dosage of the concrete which is poured twice is controlled so that the concrete in the upper die holes is exactly consistent with the height b of the lower edge of the prism block 8. After the initial setting of the concrete, the pressing plate is pressed, the upper die is lifted up for demolding, the upper die and the pressing plate are removed, and the geonet 7 is anchored in the concrete poured twice. The lower die moves to the tray, the lower die is turned over, the stripper plate at the bottom of the lower die hole is pushed, and the whole structural net 9 falls on the tray. The structural net 9 is demoulded on the previous sheet next time, stacked and stacked for 1-1.5 m, 2-3 channels are respectively arranged in the longitudinal and transverse directions of plastic packing belts, and the packing belts and the edge blocks 8 are provided with backing plates to prevent the edge blocks 8 from being damaged. The concrete adopts dry and hard concrete, and can reach higher strength under higher pressure plate and vibration, and demoulding can be carried out after pressing. The bundled structural net 9 is sent to a steam curing room for high-temperature curing, and the temperature of the steam curing is generally controlled to be not more than 80 ℃ and the design strength can be achieved within 5-8 hours, so that the concrete curing time is greatly shortened.
The construction method of the embedded structure asphalt pavement is basically the same as that of a conventional asphalt pavement except for the construction of the sealing layer 3, the lower layer 4 and the middle layer 5, and the steps of the construction method of the embedded structure asphalt pavement are as follows.
A. the roadbed is rolled, the roadbed is paved, and the subbase layer 1 and the base layer 2 are laminated as in the conventional pavement construction. The road bed and the foundation layer construction are controlled to control the elevation and the transverse slope so as to ensure that the elevation and the transverse slope of the upper surface layer meet the design requirements.
B. And after the base layer 2 is rolled, the construction of the next working procedure can be carried out after the detection meets the requirement of checking calculation standards. The base layer 2 is uniformly spread with penetrating layer oil, and the penetrating layer oil contains a small amount of asphalt, fills up tiny gaps on the surface of the base layer, and has the effect of filling gaps after infiltration. The dosage of the penetrating layer oil is 0.7-1.5 kg/m 2. The penetrating oil is completely permeated, the sealing layer 3 is timely paved after the water is evaporated, the sealing layer 3 adopts emulsified asphalt slurry sealing layer, the slurry sealing layer material is uniformly sprayed on the base layer 2 by a slurry sealing layer sprayer, the sprayer advances at a uniform speed of 1.5-3.0 km/h, and the spraying thickness is controlled to be 5-10 mm.
C. The structural net 9 sheets are paved on the sealing layer 3, the structural net 9 sheets stacked and stacked are conveyed to a site to be paved by a forklift, the forklift for paving the structural net 9 is refitted and provided with suspension arms, the suspension arms are manually matched for paving, five suspension hooks of the suspension arms are hung at four corners and the middle of the structural net 9, the structural net 9 is hoisted to be placed on the paved sealing layer 3, and the position is manually assisted to be properly adjusted. Firstly, paving the edge blocks 8 from one side of a road to the other side transversely, wherein the distance from the edge starting position to the edge starting position is 20-30 mm, gaps of 20-30 mm are reserved between the edge blocks 8 are controlled by transverse lap joint of sheets, the edge blocks 8 between sheet connection correspond to each other, and redundant edge blocks 8 of a structural net 9 are cut off at the edge starting position of the other side of the road. After one sheet is transversely paved, the subsequent structural nets 9 can be transversely and longitudinally paved at the same time, a gap of 20-30 mm is reserved between longitudinal and transverse sheets of the structural nets 9, the geotechnical nets 7 which are connected with two sheets are firmly tied every 300-600 mm by adopting nylon tie wires, redundant tie wires are cut off, the structural nets 9 are connected into a whole, and the structural nets 9 of corresponding parts are cut off when the laid sheets meet inspection wells and water drops.
D. the structural net 9 is rolled by a road roller for one time, so that the prism blocks 8 are embedded in the sealing layer 3, and the sealing layer 3 at the positions of the wedge-shaped cavity 11 and the conical cavity 12 is slightly raised.
E. The structural net 9 is uniformly spread with bonding oil, and the bonding oil has the function of better connecting the asphalt mixture of the middle surface layer 5 with the edge blocks 8 and the sealing layer 3, and the bonding oil consumption is 0.3-0.6 kg/m 2.
F. The edge parts close to the roadside and the edge of the inspection well are easy to leak by mechanically paving asphalt mixture, the edge of the outer side of the edge block 8 is filled with asphalt mixture with the same particle size as the middle surface layer 5, and the edge block is tamped by hand until the edge block is flush with the top surface of the edge block 8.
G. According to the virtual paving coefficient determined by the test, an asphalt paver is used for paving the asphalt concrete mixture of the middle surface layer 5, the volume occupied by the wedge-shaped cavity 11 and the cone-shaped cavity 12 is considered during paving, the wedge-shaped cavity 11 and the cone-shaped cavity 12 are filled with the asphalt concrete mixture, the asphalt mixture is paved at the upper part of the structural net 9 at the same time, the paving quality is checked, and the phenomenon of leakage paving can be achieved by adopting manual leakage repairing.
H. Adopting a heavy road roller to roll the asphalt mixture of the middle surface layer 5, and initially pressing: the static pressure of the heavy road roller is 1 time, the speed is controlled to be 2.0-3.0 km/h, the vibration pressure is 1 time, and the vibration pressure is 3.0km/h. The rolling method is that the driving wheel is in front and runs towards the paving direction, and the adjacent rolling belts of the inverted shaft rolling must be overlapped by 1/3-1/2 of the wheel width. The asphalt mixture in the wedge-shaped cavity 11 and the conical cavity 12 is compacted under the rolling of the road roller while rolling, so that an embedded body 10 of the middle surface layer 5 embedded into the lower surface layer 4 is formed, the periphery of the prism block 8 is tightly wrapped by the embedded body 10, the aggregate of the asphalt mixture is embedded in the meshes of the geonet 7, and the embedded body 10 is bonded with the sealing layer 3 through the structural net 9. And (3) re-pressing: and the vibration rolling of the heavy road roller is carried out, the rolling pass number is static pressure 2 times and vibration pressing 2 times, the static pressure speed is controlled to be 3.0-4.5 km/h, and the vibration pressing speed is controlled to be 5.0km/h. The compaction degree of the surface layer 5 in the upper part of the edge block 8 is detected by rolling for 6 to 8 times generally, and the requirement of acceptance specification is met.
I. Uniformly spreading bonding oil on the middle surface layer 5, wherein the bonding oil dosage is 0.3-0.6 kg/m 2.
J. Paving the asphalt concrete mixture of the upper layer 6.
K. And (3) rolling the asphalt concrete on the upper layer 6 by adopting a road roller in the same rolling mode as the step (h).
The pavement structure described in the present application document, the drawings and the embodiments is only an example of a jogged asphalt pavement structure, and the asphalt pavement structure formed by compounding a concrete precast block and a geonet and jogged asphalt mixture are all within the protection scope of the present application.
Claims (4)
1. The utility model provides a gomphosis structure bituminous paving, mainly comprises underlayment (1), basic unit (2), seal (3), lower layer (4), well surface course (5), top layer (6), characterized by: the lower surface layer (4), the middle surface layer (5) and the upper surface layer (6) form an asphalt surface layer, wherein the lower surface layer (4) and the middle surface layer (5) are mutually embedded, the lower surface layer (4) is formed by a structural net (9) and an embedded body (10), the structural net (9) is formed by compositing a geotechnical net (7) and edge blocks (8), net-shaped objects of the edge blocks (8) are uniformly arranged on the geotechnical net (7) in a square arrangement, the geotechnical net (7) is anchored in concrete of the edge blocks (8) when the edge blocks (8) are prefabricated, the edge blocks (8) are mutually pulled by the geotechnical net (7), and the horizontal displacement of the edge blocks (8) under the action of automobile load is limited;
The structure net (9) is paved on the seal layer (3), a wedge-shaped cavity (11) is formed between two adjacent edge blocks (8), a conical cavity (12) is formed between four edge blocks (8), an embedded body (10) is embedded into the wedge-shaped cavity (11) and the conical cavity (12) when the asphalt mixture of the middle surface layer (5) is paved, and the asphalt mixture is embedded into gaps of the edge blocks (8) through meshes of the geotechnical net (7) and is bonded with the seal layer (3);
The structure net (9) and the embedded body (10) are arranged on the same layer surface at the lower layer (4), the embedded body (10) is an asphalt mixture which is embedded into the lower layer (4) and is positioned between the gaps of the edge blocks (8), the embedded body (10) and the structure of the middle layer (5) are connected into a whole, the lower part of the embedded body (10) is in contact with the surface of the sealing layer (3) and is adhered, the lower part of the sealing layer (3) is adhered with the base layer (2), the asphalt mixture of the middle layer (5) is embedded into the gaps of the edge blocks (8) of the lower layer (4), and the edge blocks (8) are wrapped by the asphalt mixture of the middle layer (5) and the embedded asphalt pavement structure of the sealing layer (3).
2. The chimeric structural asphalt pavement according to claim 1, wherein: the upper part of the shape of the edge block (8) is a regular octagonal frustum with a small upper part and a large lower part, the lower part of the shape of the edge block is a regular octagonal prism, the upper top surface and the lower bottom surface of the edge block are regular octagons, the upper side surface of the edge block is 8 inclined trapezoid surfaces, the lower side surface of the edge block is eight rectangle surfaces, the inclination angle alpha of the trapezoid surfaces is 30-45 degrees, the distance W between two opposite sides of the lower bottom surface of the edge block (8) is 1-1.5 times of the thickness h3 of the lower layer (4), the height b of the lower edge is 0.5-1.5 times of the maximum crushed stone particle size of the asphalt mixture of the middle layer (5), and the edge block (8) is formed by prefabricating concrete with the strength grade not lower than C35; the geotechnical net (7) is a bidirectional glass fiber geogrid, meshes are 1 to 1.5 times of the maximum crushed stone particle size of the asphalt mixture of the middle surface layer (5), and the bidirectional tensile strength is 30 to 120kN/m.
3. The chimeric structural asphalt pavement according to claim 1, wherein: the gap V between two adjacent edge blocks (8) arranged in a square manner of the structural net (9) is 1-1.5 times of the maximum broken stone particle size of the asphalt mixture of the middle surface layer (5), the structural net (9) is a sheet finished product manufactured by a factory, each long peripheral edge geonet (7) extends out of the edge block (8) by the length of one gap V, and the structural net (9) sheet finished product is stacked and stacked in multiple layers and is firmly belted by plastic packing.
4. A construction method of the asphalt pavement with the embedded structure as defined in claim 1, which is characterized in that: the construction of the subbase layer (1), the base layer (2) and the upper layer (6) is basically the same as that of a conventional asphalt pavement, and the construction method of the asphalt pavement with the embedded structure comprises the following steps of:
a. Rolling a roadbed and paving a roadbed as in the conventional pavement construction, and layering and rolling a subbase layer (1) and a base layer (2);
b. Uniformly spreading penetrating oil on a base layer (2), fully penetrating the penetrating oil, spreading an sealing layer (3) in time after water evaporation, uniformly spreading the slurry sealing layer on the base layer (2) by using a slurry sealing layer spreader, wherein the spreading thickness is controlled to be 5-10 mm, and the spreading speed is 1.5-3.0 km/h;
c. Laying the structural mesh (9) sheets on the sealing layer (3), conveying the stacked structural mesh (9) sheets to a site to be laid by adopting a forklift, manually matching and laying, firstly transversely laying the structural mesh (9) sheets from one side of a road to the other side, leaving a gap of 20-30 mm between the edge blocks (8) at the edge starting position from 20-30 mm away from the curb, mutually corresponding the edge blocks (8) between sheet joints, and cutting off redundant edge blocks (8) of the structural mesh (9) at the other side of the road; taking a transversely paved frame as a benchmark, transversely and longitudinally paving the subsequent structural nets (9), leaving a gap of 20-30 mm between longitudinal and transverse sheets of the structural nets (9), fastening the geotechnical nets (7) connected with two sheets at intervals of 300-600 mm by adopting nylon tie wires, cutting off redundant tie wires, connecting the structural nets (9) into a whole, and cutting off the structural nets (9) of corresponding parts when the paved sheets meet inspection wells and water drops;
d. the structural net (9) is rolled by a road roller for one time, so that the edge blocks (8) are embedded in the sealing layer (3), and the sealing layers (3) at the parts of the wedge-shaped cavity (11) and the conical cavity (12) are slightly raised;
e. uniformly spreading bonding oil on the structural net (9);
f. The edges of the outer sides of the edge blocks (8) are filled with asphalt mixture with the same particle size as the middle surface layer (5) at the edge parts close to the roadside and the edge of the inspection well, and the edges are tamped by hand until the edges are level with the top surfaces of the edge blocks (8);
g. according to the virtual paving coefficient determined by the test, paving the asphalt concrete mixture on the middle surface layer (5), taking the volume occupied by the wedge-shaped cavity (11) and the conical cavity (12) into consideration during paving, filling the wedge-shaped cavity (11) and the conical cavity (12) with the asphalt concrete mixture, and paving the asphalt mixture on the upper part of the structural net (9) at the same time;
h. adopting a road roller to roll the asphalt mixture of the middle surface layer (5), compacting the asphalt mixture in the wedge-shaped cavity (11) and the cone-shaped cavity (12) under the rolling of the road roller to form an embedded body (10) of the middle surface layer (5) embedded into the lower surface layer (4), tightly wrapping the periphery of the edge block (8) by the embedded body (10), embedding the aggregate of the asphalt mixture in the mesh of the geonet (7), and bonding the embedded body (10) with the sealing layer (3) through the structural net (9);
i. Uniformly spreading bonding oil on the middle surface layer (5);
j. Paving an asphalt concrete mixture of the upper layer (6);
k. And rolling the asphalt concrete on the upper layer (6) by adopting a road roller.
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| CN113667405B (en) * | 2021-09-09 | 2023-01-13 | 长沙新立硅材料科技有限公司 | Asphalt pavement structure |
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