CN116497657A - Semi-flexible pavement structure and construction method thereof - Google Patents
Semi-flexible pavement structure and construction method thereof Download PDFInfo
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- CN116497657A CN116497657A CN202310529700.9A CN202310529700A CN116497657A CN 116497657 A CN116497657 A CN 116497657A CN 202310529700 A CN202310529700 A CN 202310529700A CN 116497657 A CN116497657 A CN 116497657A
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- 239000002131 composite material Substances 0.000 claims abstract description 102
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- 239000004568 cement Substances 0.000 claims abstract description 25
- 239000004567 concrete Substances 0.000 claims abstract description 18
- 239000011159 matrix material Substances 0.000 claims abstract description 18
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 3
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- 239000011229 interlayer Substances 0.000 abstract description 15
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Classifications
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- 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
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- 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
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- 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
- E01C11/165—Reinforcements particularly for bituminous or rubber- or plastic-bound pavings
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- 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
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/50—Removable forms or shutterings for road-building purposes; Devices or arrangements for forming individual paving elements, e.g. kerbs, in situ
- E01C19/502—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes
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- 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
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
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- 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
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
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- 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
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
- E01C7/26—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre
- E01C7/262—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders mixed with other materials, e.g. cement, rubber, leather, fibre with fibrous material, e.g. asbestos; with animal or vegetal admixtures, e.g. leather, cork
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- 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
- E01C7/325—Joining different layers, e.g. by adhesive layers; Intermediate layers, e.g. for the escape of water vapour, for spreading stresses
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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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention belongs to the technical field of pavement structures, and relates to a semi-flexible pavement structure and a construction method thereof, wherein the pavement structure comprises a sand layer, a fine sand layer, a first composite layer and a second composite layer which are sequentially arranged from bottom to top and mutually meshed, and the meshed surfaces of two adjacent layers are provided with thorn steel wires; the first composite layer comprises a flexible cement concrete matrix and a framework embedded in the flexible cement concrete matrix, the framework comprises two first steel wire meshes, the cage body is positioned between the two first steel wire meshes, and two sides of the cage body are respectively fixed with the two first steel wire meshes; the second composite layer comprises an asphalt concrete composite body and a composite structure body buried in the asphalt concrete composite body, one end of the first connecting component is connected with the composite structure body, and the other end of the first connecting component is connected with the cage body. The invention improves the adhesion and interface fusion of the interlayer occlusion structure, ensures that the integrity between layers is good, has long service life, and ensures that the social benefit and the economic benefit of the whole life cycle of the pavement are obvious.
Description
Technical Field
The invention belongs to the technical field of pavement structures, and particularly relates to a semi-flexible pavement structure and a construction method thereof.
Background
Along with the rapid development of traffic industry, road engineering connecting the south and north of the large river is rapidly developed, and in road engineering construction, the frequently used road surface structure is roughly divided into two types according to the mechanical property of the road surface under the action of driving, namely a flexible road surface and a rigid road surface, wherein the two types of road surface have different use occasions and advantages and disadvantages. The flexible pavement comprises an asphalt surface layer and a multi-layer structure, the whole structure is flexible and has certain plasticity, and the surface layer structure is easily influenced by rutting and is extremely unstable under the influence of long-term driving action and temperature. Most rigid pavement is poured by rigid cement mortar, has high bearing capacity and good rut resistance, but the temperature change has great influence on the internal stress of the rigid pavement, and is easy to generate endogenous expansion cracks.
In the last decade, a great deal of research time and labor are invested in the pavement structural design of each scientific research institute, and the harvest is quite abundant. The semi-flexible pavement belongs to a compact-skeleton embedded-extruded structure, is a complex of rigid cement mortar and a flexible asphalt mixture skeleton, is filled in pores in the flexible asphalt mixture, greatly improves the anti-pushing deformation capability of the asphalt mixture under high temperature conditions, has no seam, strong crack resistance, good flexibility, high bearing capacity of the rigid cement mortar pavement, good rut resistance and good rigidity, has a deflection value of 1/5-1/2 of that of a common asphalt pavement, has good acid resistance, oil resistance, water resistance and coloring property, can be applied to rut disease maintenance of an old pavement, and can also be applied to a newly built pavement.
At present, the application of the semi-flexible pavement is in popularization and further verification of the effect, and after time verification, the semi-flexible pavement constructed in the loose foundation is found to be more outstanding in the defect of poor interfacial fusion of the semi-flexible pavement due to loose matrix density and poor bearing capacity, so that the overall structural stability is poor, and the service life of the pavement is not high.
Disclosure of Invention
In view of the above, the invention provides a semi-flexible pavement structure and a construction method thereof, wherein the pavement structure comprises a sand layer, a fine sand layer, a first composite layer and a second composite layer which are sequentially arranged from bottom to top, the layers are combined with thorn steel wires in an uneven fusion state to form an interlayer double-engagement structure, and emulsified asphalt adhesive layer oil is arranged to improve the adhesive force of the interlayer engagement structure, so that the integrity between layers is better, and the interface fusion property is improved. In addition, the heavy load force loaded on the second composite layer of the surface layer is dissipated through the reinforcing steel bars and the first carbon fiber strips in the composite structure body on one hand, on the other hand, the force can be transferred to the oval steel ring through the first rod body connected with the heavy load force, so that the long axis side of the oval steel ring is shortened, the synchronous short axis side is lengthened, at the moment, the short axis side on the upper side can provide opposite supporting force for the second composite layer on the upper side of the heavy load force, the problem that the acting force is singly deformed downwards after the heavy load force is eliminated, the force is sequentially transferred to the second rod body and the foundation pile by the short axis side on the lower side of the heavy load force is further dissipated, the supporting force, the rigidity and the ductility of the semi-flexible pavement structure are all reinforced, and the whole fusion performance is higher. The construction method of the pavement structure solves the problem that the semi-flexible pavement constructed in the loose foundation has poor interfacial fusion property due to loose matrix density and poor bearing capacity.
The technical scheme of the invention is as follows:
a semi-compliant pavement structure comprising:
the sand layer, the fine sand layer, the first composite layer and the second composite layer are sequentially arranged from bottom to top and meshed with each other, and steel thorns are arranged on the meshed surfaces of two adjacent layers;
the first composite layer comprises a flexible cement concrete matrix and a framework embedded in the flexible cement concrete matrix, wherein the framework comprises:
two first steel wire meshes which are arranged up and down;
the cage bodies are arranged at intervals and positioned between the two first steel wire meshes, and two sides of the cage bodies are fixedly connected with the two first steel wire meshes respectively;
the second composite layer comprises an asphalt concrete composite body and a composite structure body embedded in the asphalt concrete composite body;
and one end of the first connecting component is connected with the composite structure body, and the other end of the first connecting component is connected with the cage body and is used for transmitting force to the cage body to deform when the surface of the second composite layer is loaded, and supporting force in the opposite direction is provided for the second composite layer by utilizing the deformation of the cage body.
Preferably, a plurality of second carbon fiber strips are arranged on the first steel wire mesh sheet, and the second carbon fiber strips are arranged in a staggered mode in the transverse and longitudinal directions and are arranged between adjacent steel wires of the first steel wire mesh sheet.
Preferably, the cage body comprises four steel bars arranged in parallel, a plurality of oval steel rings arranged at intervals are sleeved on the outer sides of the four steel bars, the four steel bars are arranged at intervals along the inner sides of the oval steel rings, and the oval steel rings are fixedly connected with the steel bars.
Preferably, the composite structure body comprises a reinforcing mesh, a plurality of first carbon fiber strips are arranged on the reinforcing mesh, the first carbon fiber strips are arranged in a staggered mode in the transverse and longitudinal directions, and each first carbon fiber strip is arranged between adjacent reinforcing steel bars of the reinforcing mesh.
Preferably, the first connecting assembly comprises a plurality of rod groups arranged at intervals, each rod group comprises two first rod bodies with X-shaped intersecting spaces, one end of each first rod body is connected with the reinforcing mesh, and the other end of each first rod body is connected with the long shaft edge of the oval steel ring.
Preferably, the device further comprises a second connecting component for connecting the sand layer, the fine sand layer and the first composite layer, wherein the second connecting component is positioned in the sand layer, the fine sand layer and the first composite layer.
Preferably, the second connecting assembly comprises a plurality of foundation piles located in the sand stone layer, the foundation piles are arranged at intervals, connecting piles are arranged on the upper surfaces of the foundation piles, the connecting piles are connected with one ends of two second rod bodies, and the other ends of the two second rod bodies are connected with the short shaft edges of two adjacent oval steel rings respectively.
Preferably, the foundation pile comprises a foundation pile, a plurality of steel wire meshes and a plurality of scales, wherein one end of each scale is vertically fixed with the foundation pile, and each scale is connected with the first steel wire meshes and the steel bar meshes respectively.
The construction method of the semi-flexible pavement structure comprises the following steps of:
s1, excavating a roadbed foundation pit, and building a template in the foundation pit;
s2, pouring a plurality of foundation piles, presetting a connecting pile and a scale on the upper surface of the foundation piles, enabling the scale to be vertical to the foundation piles, enabling the height of the scale to be consistent with the preset height of the roadbed, measuring the height on the scale, marking corresponding positions of the first steel wire mesh and the composite structure body, and arranging a connecting piece at the marking position;
s3, erecting a framework on the template, binding and fixing a connecting piece on the scale and the first steel wire net piece respectively by using steel wires, fixing each connecting pile with one ends of two second rod bodies, and fixing the other ends of the two second rod bodies with the short shaft edges of two adjacent oval steel rings respectively;
s4, filling sand stone, reinforcing by using permeable grouting, and filling holes to form a sand stone layer;
s5, filling fine sand stone, vibrating and compacting, then reinforcing by using permeable grouting, and filling pores to form a fine sand layer;
s6, erecting a second steel wire mesh on the template, binding one ends of a plurality of first rod bodies on the long axis side of the oval steel ring, adjusting the adjacent two first rod bodies to be in an X shape by means of the righting effect of the second steel wire mesh, and fixing the end parts of the first rod bodies with the long axis side of the oval steel ring;
s7, spraying concrete slurry in a layered concrete spraying mode to form a first composite layer;
s8, paving large-particle asphalt mixtures, wherein the height of the large-particle asphalt mixtures reaches half of the height of a preset second composite layer, the upper surface of the large-particle asphalt mixtures is made into an uneven state, then grouting cement paste is filled between the large-particle asphalt mixtures under high pressure, and the grouting can be stopped after the cement paste fills gaps among the whole large-particle asphalt mixtures and has residual liquid, and conventional curing is carried out for 1-2 days;
s9, taking away the second steel wire mesh, vertically and horizontally paving steel bars to form a steel bar net, respectively fixing the steel bar net and the scale, respectively fixing the first rod body and the steel bar net, shearing off the part of the first rod body, which is higher than the upper surface of the steel bar net, horizontally and longitudinally staggered paving first carbon fiber strips on the surface of the steel bar net, arranging the first carbon fiber strips between adjacent steel bars of the steel bar net, continuously paving large-particle asphalt mixture after fixing the first carbon fiber strips and the steel bar net, leveling the upper surface after the upper surface exceeds the scale by a certain distance, pouring cement slurry between the large-particle asphalt mixture at high pressure, stopping pouring when residual liquid is reserved in a gap between the whole large-particle asphalt mixture filled with the cement slurry, trowelling the upper surface to form a second composite layer, conventionally maintaining for 15-20 days, and removing the template.
Preferably, the sand layer and the first composite layer surface layer are made into an uneven state, then the thorn steel wires are paved, the emulsified asphalt adhesive layer oil is poured, the thorn steel wires are paved after the fine sand layer surface layer is made into an uneven state, and then the isolation layer and the waterproof layer are paved in sequence, and then the emulsified asphalt adhesive layer oil is poured.
Compared with the prior art, the semi-flexible pavement structure and the construction method thereof provided by the invention have the advantages that the pavement structure comprises the sand layer, the fine sand layer, the first composite layer and the second composite layer which are sequentially arranged from bottom to top, the first composite layer comprises the flexible cement concrete matrix and the framework embedded in the flexible cement concrete matrix, the second composite layer comprises the asphalt concrete composite body and the composite structure body embedded in the asphalt concrete composite body, the first connecting component is used for connecting the composite structure body with the cage body, the second connecting component is used for connecting the sand layer, the fine sand layer and the first composite layer, the interlayer double-occlusion structure is formed by combining the thorn wires in an uneven fusion state between the layers, the adhesive force of the interlayer-occlusion structure is improved by arranging the emulsified asphalt adhesive layer oil, the interface fusion is improved, the integrity between the layers is better, in addition, a connecting structure is added in the semi-flexible pavement and the matrix structure, the connecting structure is made of rigid and flexible materials, so that the heavy load force loaded on the second composite layer of the surface layer can be transmitted and dissipated through the reinforcing steel bars and the first carbon fiber strips in the composite structure body, on the one hand, the force can be transmitted to the oval steel ring through the first rod body connected with the connecting structure, the major axis side of the oval steel ring is shortened, the synchronous minor axis side is lengthened, at the moment, the minor axis side on the upper side can provide opposite supporting force for the second composite layer on the upper side of the synchronous minor axis side, the problem that the acting force is singly downwards deformed after the loading is eliminated, the force is sequentially transmitted to the second rod body and the foundation pile by the minor axis side on the lower side, the supporting force, the rigidity and the ductility of the semi-flexible pavement structure are all reinforced, the whole fusion property is higher, the problems that the semi-flexible pavement constructed in the loose foundation is poor in interfacial fusion property due to the fact that the density of a matrix is loose and the bearing capacity is poor are solved. The interface fusion property and the overall structural stability of the pavement structure obtained by the method are improved, collapse, cracking, rheology and other phenomena of a semi-flexible pavement constructed in a loose foundation can be effectively prevented, maintenance frequency is reduced, the service life of the pavement is long, and the social benefit and the economic benefit of the whole life cycle are obvious and are worthy of popularization.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of a part of the structure of the present invention 1;
FIG. 3 is a schematic view of a partial structure of the present invention 2;
FIG. 4 is a flow chart of the construction method of the present invention;
fig. 5 is a stress state diagram of the present invention.
Detailed Description
A detailed description of one embodiment of a semi-compliant pavement structure and construction method thereof according to the present invention will be provided with reference to fig. 1 through 5, but it should be understood that the scope of the invention is not limited by the embodiment.
Example 1
As shown in fig. 1-3, the semi-flexible pavement structure provided by the invention comprises a sand layer 1, a fine sand layer 2, a first composite layer 3 and a second composite layer 4 which are sequentially arranged from bottom to top and mutually meshed, wherein steel thorns are arranged on meshed surfaces of two adjacent layers. The structure of the first composite layer 3 comprises a flexible cement concrete matrix and a framework 5, the framework 5 is buried in the flexible cement concrete matrix, the structure of the framework 5 comprises first steel wire meshes 501 which are arranged up and down, a plurality of cage bodies 502 which are arranged in parallel are arranged between the two first steel wire meshes 501 at intervals, and the upper side and the lower side of the cage bodies 502 are respectively fixedly connected with the two first steel wire meshes 501 through steel wires.
Further, the structure of the cage body 502 includes four steel bars 5012 of parallel arrangement, and four steel bars 5012 outside cover is equipped with oval steel ring 5022 that a plurality of intervals set up, and four steel bars 5012 set up along oval steel ring 5022's inboard interval, and oval steel ring 5022 forms the main part skeleton texture of first composite bed 3 with four steel bars 5012 fixed connection.
The structure of second composite bed 4 includes asphalt concrete complex and composite structure body 6, and composite structure body 6 buries in asphalt concrete complex, and composite structure body 6 includes the bar mat, is provided with a plurality of first carbon fiber strips on the bar mat, and first carbon fiber strips are crisscross setting in the horizontal and vertical, and every first carbon fiber strip sets up between the adjacent reinforcing bar of bar mat. The reinforcing mesh and the first carbon fiber strips cooperate to form a rigid-flexible combined structure, so that the bearing capacity of the asphalt concrete composite body can be enhanced, and cracking caused by overlarge temperature difference effect of the asphalt concrete composite body can be effectively prevented. The first carbon fiber strips are arranged in an interweaved structure, so that the bearing capacity acting on the asphalt concrete composite body can be improved, and meanwhile, the force acting on the second composite layer 4 is balanced after being transmitted through the extending direction of the fiber tissue of the first carbon fiber strips, so that acting force is dispersed, and the deformation resistance of the asphalt concrete composite body is improved.
Further, in order to enhance the connection between the layers and improve the structural integrity, a first connecting component for connecting the adjacent layers is further provided, one end of the first connecting component is connected with the composite structure body 6, and the other end is connected with the cage body 502, so that when the surface of the second composite layer 4 is loaded, the force is transferred to the cage body 502 to deform, and the deformation of the cage body 502 is utilized to provide a supporting force in the opposite direction for the second composite layer 4. Specifically, the structure of first coupling assembling includes the pole group that a plurality of intervals set up, and every pole group is including two crossing first body of rod 7 that are X type in space, and the one end and the reinforcing bar net of first body of rod 7 are connected, and the other end and the major axis limit of oval steel ring 5022 of first body of rod 7 are connected.
As shown in fig. 5, when a vehicle passes through, the vertical heavy load force F loaded on the second composite layer is transmitted to the transverse direction through the reinforcing steel bars and the first carbon fiber strips in the composite structure body, the force is transmitted to the first rod body 7 through the reinforcing steel bars, the force is transmitted to the oval steel ring along the length direction of the first rod body 7 through the first rod body 7, the major axis side of the oval steel ring is shortened under the effect of the pressure transmitted by the force, the synchronous minor axis side is lengthened, at the moment, the minor axis side on the upper side of the oval steel ring can provide a supporting force in the opposite direction for the second composite layer on the upper side of the oval steel ring so as to facilitate pre-compensation of the deformation amount in advance, the problems that the acting force is transmitted downwards singly after the loading and the deformation is downward singly so that the interlayer bonding surface is pulled too much and is easy to separate are solved, and in addition, the minor axis side on the lower side of the oval steel ring sequentially transmits the force to the second rod body and the foundation pile so that the supporting force, the ductility, the rigidity and the ductility of the semi-flexible pavement structure are all reinforced.
Further, in order to improve the resistance to cracking in the structure, a plurality of second carbon fiber strips 5011 for reinforcing the structure are disposed on the first wire mesh 501, the second carbon fiber strips 5011 are disposed in a staggered manner, and each second carbon fiber strip 5011 is disposed between adjacent wires 5012 of the first wire mesh 501, and the staggered structure is formed by the wires 5012 and the second carbon fiber strips 5011. The steel wires 5012 and the second carbon fiber strips 5011 can strengthen the whole structure in the longitudinal and transverse directions, and the extension force and the bearing capacity in each direction are improved.
Further, in order to further enhance the integrity between the inner layers, a second connecting component is further provided, and the second connecting component is used for connecting the sand stone layer 1, the fine sand layer 2 and the first composite layer 3. Specifically, the structure of second coupling assembling is including a plurality of foundation piles 9 that are located in the sand stone layer 1, a plurality of foundation piles 9 interval sets up in the sand stone layer 1, the upper surface of foundation pile 9 has the connecting pile, the structure of connecting pile can be rings or cylinder, rings or cylinder's one end is buried in foundation pile 9 and is realized being fixed with foundation pile 9 through cement pouring's method, the connecting pile is connected with the one end of two second body of rod 8, the other end of two second body of rod 8 is connected with the minor axis limit of two adjacent oval steel rings 5022 respectively.
Further, the device further comprises a plurality of scales 10, wherein the first function of the scales 10 is used for calibrating the heights of all layers, the second function is used for realizing interlayer connection, one end of each scale 10 is vertically fixed with the foundation pile 9, the middle section of each scale 10 is fixedly connected with the first steel wire net 501 and the steel bar net respectively, and the scales 10 can be used for reinforcing all the components and the layer structure again in a dot array mode while calibrating the positions of all the components.
Wherein the first rod body 7 and the second rod body 8 are steel rods.
The invention takes the framework 5, the plurality of scales 10, the second rod body 8, the composite structure body 6 and the first rod body 7 as the main body of the structure to increase the integrity of the whole structure, and simultaneously, the first carbon fiber strips and the second carbon fiber strips 5011 are matched with the peripheral structure to balance the force acted on the second composite layer 4, so that the acting force is dispersed, the single-point bearing capacity acted on the second composite layer 4 is reduced, and the deformation resistance of the semi-flexible pavement structure is improved. In addition, when a vehicle passes through, the heavy load force loaded on the second composite layer of the surface layer is transmitted and dissipated through the reinforcing steel bars and the first carbon fiber strip edges in the composite structure body on one hand, and on the other hand, the force can be transmitted to the oval steel ring through the first rod body connected with the heavy load force, so that the long axis edge of the oval steel ring is shortened, the synchronous short axis edge is lengthened, at the moment, the short axis edge on the upper side can provide a supporting force in the opposite direction for the second composite layer on the upper side, the problem that the acting force is singly deformed downwards after the loading is eliminated, the interlayer bonding surface is stressed too much and is easy to separate is solved, the force is transmitted to the second rod body and the foundation pile on the short axis edge on the lower side in sequence, and the supporting force, the rigidity in all directions and the ductility of the semi-flexible pavement structure are all reinforced. The interface between each layer combines with the thorn steel wire in an uneven fusion state to form a double-engagement structure between the layers, and the emulsified asphalt adhesive layer oil is arranged to improve the adhesion of the engagement structure between the layers, so that the integrity between the layers is better, and the interface fusion is improved.
Taking a certain engineering as an example, the construction method of the semi-flexible pavement structure is described in detail, as shown in fig. 4, and specifically includes the following steps:
scribing on the roadbed to be built, dividing the scribed roadbed section into a plurality of regional blocks, selecting the regional blocks at intervals, excavating a roadbed foundation pit on the regional blocks, and building templates on two sides of the foundation pit after the foundation pit is excavated so as to facilitate the next construction.
Pouring a plurality of foundation piles 9 on the inner bottom surface of a foundation pit, presetting a connecting pile and a scale 10 on the upper surface of the foundation piles 9 while pouring, vertically arranging the scale 10, enabling the scale 10 to be vertical to the upper surface of the foundation piles 9, enabling the height of the scale 10 to be consistent with the preset height of a roadbed, taking the scale 10 as a reference, measuring the height on the scale 10 according to design standards, marking corresponding positions of the first steel wire meshes 501 and the composite structure body 6, and arranging connecting pieces at the marking positions.
The framework 5 is erected on a template, the connecting piece on the scale 10 and the first steel wire net piece 501 are respectively bound and fixed by steel wires, each connecting pile is fixed with one ends of two second rod bodies 8, and the other ends of the two second rod bodies 8 are respectively fixed with the short shaft edges of two adjacent oval steel rings 5022.
Filling sand stone, reinforcing by using permeable grouting, filling pores to form a sand stone layer 1, after the surface layer of the sand stone layer 1 is made into an uneven state, scattering steel wires on the surface layer to facilitate forming an interlayer fusion transition state, and then pouring emulsified asphalt adhesive layer oil on the surface layer to improve the adhesion of an interlayer occlusion structure, so that the formation of the interlayer tight occlusion structure is facilitated, and the integrity between layers is better.
Filling fine sand stone, vibrating, reinforcing by using permeable grouting, filling pores to form a fine sand layer 2, and after the surface layer of the fine sand layer 2 is made into an uneven state, scattering steel wires on the fine sand layer to facilitate forming an interlayer fusion transition state, so that the layers are tightly combined, and after the integrity is better, an isolation layer and waterproof layer post-pouring emulsified asphalt viscous layer oil are paved in sequence to improve the adhesion of an interlayer occlusion structure.
The second steel wire meshes are erected on the template, one ends of a plurality of first rod bodies 7 are bound on the long axis side of the oval steel ring 5022, two adjacent first rod bodies 7 are adjusted to be in an X shape by means of the righting effect of the second steel wire meshes, and then the end parts of the first rod bodies 7 are fixed with the long axis side of the oval steel ring 5022.
Spraying concrete slurry in a layered concrete spraying mode to form a first composite layer 3, after the surface layer of the first composite layer 3 is made into an uneven state, spraying steel wires on the surface layer to facilitate forming an interlayer fusion transition state, and then pouring emulsified asphalt adhesive layer oil on the surface layer to improve the adhesive force of an interlayer occlusion structure.
Paving large-particle asphalt mixtures, wherein the height of the large-particle asphalt mixtures reaches half of the height of a preset second composite layer 4, the upper surface of the large-particle asphalt mixtures is in an uneven state, then grouting cement paste between the large-particle asphalt mixtures at high pressure, stopping grouting after the cement paste fills gaps among the whole large-particle asphalt mixtures and has residual liquid, and conventionally curing for 1-2 days;
taking away the second steel wire mesh, vertically and horizontally paving steel bars to form a steel bar net, respectively fixing the steel bar net and the scale 10, fixing the first rod body 7 and the steel bar net, shearing off the part of the first rod body 7 higher than the upper surface of the steel bar net, horizontally and longitudinally staggered paving first carbon fiber strips on the surface of the steel bar net, arranging the first carbon fiber strips between adjacent steel bars of the steel bar net, continuously paving large-particle asphalt mixture after fixing the first carbon fiber strips and the steel bar net, leveling the upper surface after the upper surface exceeds the upper surface of the scale 10 by 20mm, then pouring cement paste between the large-particle asphalt mixture under high pressure, and stopping pouring after surplus liquid is flooded out in a gap between the whole large-particle asphalt mixture filled with the cement paste, leveling the upper surface to form a second composite layer 4, conventionally curing for 15-20 days, and removing the template.
After the region blocks constructed in the first step are finished, the rest region blocks are constructed at intervals, so that the whole pavement construction is finished.
Furthermore, the waterproof layer is a polyurethane coating film, the thickness of the coating film is 1-1.2mm, the construction of the isolation layer and the waterproof layer is carried out in a conventional mode, and the construction of the isolation layer and the waterproof layer can prevent water from penetrating into the lower part of the roadbed and damaging the structure of the roadbed so as to lead to instability of the roadbed structure.
The invention provides a semi-flexible pavement structure and a construction method thereof, the pavement structure comprises a sand layer, a fine sand layer, a first composite layer and a second composite layer which are sequentially arranged from bottom to top, wherein the first composite layer comprises a flexible cement concrete matrix and a framework embedded in the flexible cement concrete matrix, the second composite layer comprises an asphalt concrete complex and a composite structure embedded in the asphalt concrete complex, the composite structure is connected with a cage body by a first connecting component, the sand layer, the fine sand layer and the first composite layer are connected by a second connecting component, the layers are combined with thorn wires in an uneven fusion state to form a double-occlusion structure between the layers, emulsified asphalt adhesive layer oil is arranged to improve the adhesion of the inter-layer occlusion structure, the interface fusion is improved, the integrity between the layers is better, in addition, a connecting structure is added in the semi-flexible pavement and the matrix structure, the connecting structure is made of rigid and flexible materials, so that the heavy load force loaded on the second composite layer of the surface layer can be transmitted and dissipated through the reinforcing steel bars and the first carbon fiber strips in the composite structure body, on the one hand, the force can be transmitted to the oval steel ring through the first rod body connected with the connecting structure, the major axis side of the oval steel ring is shortened, the synchronous minor axis side is lengthened, at the moment, the minor axis side on the upper side can provide opposite supporting force for the second composite layer on the upper side of the synchronous minor axis side, the problem that the acting force is singly downwards deformed after the loading is eliminated, the force is sequentially transmitted to the second rod body and the foundation pile by the minor axis side on the lower side, the supporting force, the rigidity and the ductility of the semi-flexible pavement structure are all reinforced, the whole fusion property is higher, the problems that the semi-flexible pavement constructed in the loose foundation is poor in interfacial fusion property due to the fact that the density of a matrix is loose and the bearing capacity is poor are solved. The interface fusion property and the overall structural stability of the pavement structure obtained by the method are improved, collapse, cracking, rheology and other phenomena of a semi-flexible pavement constructed in a loose foundation can be effectively prevented, maintenance frequency is reduced, the service life of the pavement is long, and the social benefit and the economic benefit of the whole life cycle are obvious and are worthy of popularization.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations within the scope of the present invention will be apparent to those skilled in the art.
Claims (10)
1. A semi-compliant pavement structure, comprising:
the sand and stone layer (1), the fine sand layer (2), the first composite layer (3) and the second composite layer (4) are sequentially arranged from bottom to top and meshed with each other, and steel thorns are arranged on the meshed surfaces of two adjacent layers;
the first composite layer (3) comprises a flexible cement concrete matrix and a skeleton (5) embedded in the flexible cement concrete matrix, wherein the skeleton (5) comprises:
two first wire meshes (501) arranged up and down;
the cage bodies (502) are arranged at intervals and positioned between the two first steel wire meshes (501), and two sides of the cage bodies are fixedly connected with the two first steel wire meshes (501) respectively;
the second composite layer (4) comprises an asphalt concrete composite body and a composite structure body (6) embedded in the asphalt concrete composite body;
and one end of the first connecting component is connected with the composite structure body (6), and the other end of the first connecting component is connected with the cage body (502) and is used for transmitting force to the cage body (502) to deform when the surface of the second composite layer (4) is loaded, and the deformation of the cage body (502) is utilized to provide opposite supporting force for the second composite layer (4).
2. A semi-flexible pavement structure according to claim 1, characterized in that said first wire mesh (501) is provided with a plurality of second carbon fiber strips (5011), said second carbon fiber strips (5011) being arranged in a staggered manner transversely and longitudinally and between adjacent wires (5012) of the first wire mesh (501).
3. The semi-flexible pavement structure according to claim 1, wherein the cage body (502) comprises four steel bars (5012) arranged in parallel, a plurality of oval steel rings (5022) arranged at intervals are sleeved outside the four steel bars (5012), the four steel bars (5012) are arranged at intervals along the inner side of the oval steel rings (5022), and the oval steel rings (5022) are fixedly connected with the steel bars (5012).
4. A semi-flexible pavement structure as claimed in claim 3, wherein said composite structure (6) comprises a mesh of steel bars, said mesh being provided with a plurality of first carbon fibre strips, said first carbon fibre strips being staggered longitudinally and transversely, and each first carbon fibre strip being disposed between adjacent steel bars of the mesh.
5. A semi-flexible pavement structure according to claim 4, wherein said first connecting means comprises a plurality of spaced rod sets, each rod set comprising two first rod bodies (7) intersecting in space and having an X-shape, one end of each first rod body (7) being connected to said reinforcing mesh, and the other end of each first rod body (7) being connected to the long axis side of the oval steel ring (5022).
6. A semi-flexible pavement structure according to claim 5, further comprising a second connection assembly for connection between the sand layer (1), the fine sand layer (2), the first composite layer (3), said second connection assembly being located within said sand layer (1), fine sand layer (2), the first composite layer (3).
7. A semi-flexible pavement structure as set forth in claim 6 wherein said second connection assembly comprises a plurality of foundation piles (9) disposed in said gravel layer (1), said foundation piles (9) being disposed at intervals, said foundation piles (9) being provided on their upper surfaces with connection piles connected to one ends of two second rod bodies (8), the other ends of said two second rod bodies (8) being connected to the short-axis edges of two adjacent oval-shaped steel rings (5022), respectively.
8. A semi-flexible pavement structure according to claim 7, further comprising a plurality of scales (10), one end of said scales (10) being vertically fixed to said foundation pile (9), said scales (10) being connected to said first wire mesh sheet (501) and to said reinforcing mesh, respectively.
9. A method of constructing a semi-compliant pavement structure in accordance with claim 8, comprising the steps of:
s1, excavating a roadbed foundation pit, and building a template in the foundation pit;
s2, pouring a plurality of foundation piles (9), presetting a connecting pile and a scale (10) on the upper surface of the foundation piles (9), enabling the scale (10) to be perpendicular to the foundation piles (9) and enabling the height of the scale (10) to be consistent with the preset height of a roadbed, measuring the height on the scale (10), marking corresponding positions of a first steel wire mesh sheet (501) and a composite structure body (6), and arranging a connecting piece at the marking position;
s3, erecting a framework (5) on a template, binding and fixing a connecting piece on a scale (10) and a first steel wire net piece (501) respectively by using steel wires, fixing each connecting pile with one ends of two second rod bodies (8), and fixing the other ends of the two second rod bodies (8) with short shaft edges of two adjacent oval steel rings (5022) respectively;
s4, filling sand stone, reinforcing by using permeable grouting, and filling holes to form a sand stone layer (1);
s5, filling fine sand stone, vibrating and compacting, then reinforcing by using permeable grouting, and filling pores to form a fine sand layer (2);
s6, erecting a second steel wire mesh on a template, binding one ends of a plurality of first rod bodies (7) on the long axis side of the oval steel ring (5022), adjusting two adjacent first rod bodies (7) to be in an X shape by means of the righting effect of the second steel wire mesh, and fixing the end parts of the first rod bodies (7) with the long axis side of the oval steel ring (5022);
s7, spraying concrete slurry in a layered concrete spraying mode to form a first composite layer (3);
s8, paving large-particle asphalt mixtures, wherein the height of the large-particle asphalt mixtures reaches half of the height of a preset second composite layer (4), the upper surface of the large-particle asphalt mixtures is in an uneven state, then grouting cement paste is filled between the large-particle asphalt mixtures under high pressure, and the grouting can be stopped after the cement paste fills gaps among the whole large-particle asphalt mixtures and has residual liquid, and conventional curing is carried out for 1-2 days;
s9, taking away a second steel wire mesh, vertically and horizontally paving steel bars to form a steel bar net, respectively fixing the steel bar net and the scale (10), and the first rod body (7) and the steel bar net, shearing off the part of the first rod body (7) higher than the upper surface of the steel bar net, horizontally and longitudinally staggered paving first carbon fiber strips on the surface of the steel bar net, arranging the first carbon fiber strips between adjacent steel bars of the steel bar net, continuously paving large-particle asphalt mixture after fixing the first carbon fiber strips and the steel bar net, leveling the upper surface after the upper surface exceeds the scale (10) by a certain distance, pouring cement slurry between the large-particle asphalt mixture under high pressure, stopping pouring when residual liquid is left in a gap between the whole large-particle asphalt mixture filled with the cement slurry, trowelling the upper surface to form a second composite layer (4), and conventionally curing for 15-20 days, and removing the template.
10. The construction method of the semi-flexible pavement structure according to claim 9, wherein the sand layer (1) and the first composite layer (3) are laid after being made into an uneven state, the thorn steel wires are laid, the emulsified asphalt adhesive layer oil is poured, the thorn steel wires are laid after being made into an uneven state, and the isolation layer and the waterproof layer are laid in sequence.
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