CN101855404B - Method of continuously repaving asphalt mixture layer of paved road in-situ and self-propelled vehicle system therefor - Google Patents

Method of continuously repaving asphalt mixture layer of paved road in-situ and self-propelled vehicle system therefor Download PDF

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Publication number
CN101855404B
CN101855404B CN2008801157756A CN200880115775A CN101855404B CN 101855404 B CN101855404 B CN 101855404B CN 2008801157756 A CN2008801157756 A CN 2008801157756A CN 200880115775 A CN200880115775 A CN 200880115775A CN 101855404 B CN101855404 B CN 101855404B
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China
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asphalt mixtures
layer
particle diameter
new material
aggregate
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CN101855404A (en
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笠原笃
后藤文夫
五味笃树
奥野隆
国岛武史
尹恢允
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GREEN ARM Co
Hitachi Construction Machinery Co Ltd
Sumitomo SHI Construction Machinery Sales Co Ltd
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GREEN ARM Co
Hitachi Construction Machinery Co Ltd
Sumitomo SHI Construction Machinery Sales Co Ltd
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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
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/065—Recycling in place or on the road, i.e. hot or cold reprocessing of paving in situ or on the traffic surface, with or without adding virgin material or lifting of salvaged material; Repairs or resurfacing involving at least partial reprocessing of the existing paving

Abstract

Provided is a method of continuously repaving the asphalt mixture layer of a paved road in-situ while driving a self-propelled vehicle system. Also provided is a self-propelled vehicle system for the method. The method comprises: a step in which the surface of an asphalt mixture layer is heated to conduct the heat to a given depth and soften the layer down to the depth; a step in which the asphalt mixture layer is scraped down to the given depth to give an old asphalt mixture; a step in which a large-diameter aggregate having been stored is added to the old asphalt mixture; a step in which the old asphalt mixture to which the large-diameter aggregate has been added is converted to a reinforced asphalt mixture; a step in which the reinforced asphalt mixture is spread on the residual asphalt mixture layer and the surface is leveled to form a reinforced layer having a higher coefficient of elasticity than the residual layer; a step in which an asphalt mixture for a new surface layer which has been stored is placed on the reinforced layer; a step in which the asphalt mixture for a new surface layer is spread and leveled to form a new surface layer; and a step in which the reinforced layer and the new surface layer are compacted, in the hot state, and united with each other.

Description

Re-lay continuously on the road surface road of mating formation the asphalt mixtures layer method and be used for the self-propelled vehicle system of this method
Technical field
The present invention relates to re-lay continuously on the road surface road of mating formation the asphalt mixtures layer method and be used for the self-propelled vehicle system of this method.Particularly; The surface of heating asphalt mixtures layer; Make the degree of depth of the boundary face between heat leak to basic unit that surmounts the asphalt mixtures layer and the top layer or be equivalent to this degree of depth the asphalt mixtures layer the degree of depth and soften; And it scarifying formed old asphalt mixtures; Add the aggregate of big particle diameter or be attached with the aggregate of pitch to this old asphalt mixtures, perhaps contain the new material arbitrarily in the asphalt mixtures of size distribution of big diameter aggregate, through it mixing is formed the reinforcement asphalt mixtures; Afterwards to scarifying asphalt mixtures layer and the even reinforcement asphalt mixtures in remaining rest layers upper berth; Make that contain coefficient of elasticity forms big particle diameter strengthening course greater than the intermediate layer of the big diameter aggregate of the coefficient of elasticity of rest layers, on this big particle diameter strengthening course, add and the shop is even is used for the asphalt mixtures on new top layer and forms new top layer, big particle diameter strengthening course of one compacting and new top layer under the accumulation of heat state.
Background technology
Mat formation road because vertical and the compression of horizontal direction and the bending of tensile stress due to the frequent traffic of vehicle, crackle or sinking such as can split.Given this, as shown in Figure 1, the road of mating formation forms the 3-tier architecture that is made up of roadbed, roadbed and asphalt mixtures layer usually.More specifically, as shown in Figure 2, on solid roadbed, be provided with two-layer roadbed, this roadbed is at sand and rubble as the pitch paver, promptly adds stabilizing agent such as cement or petroleum tar emulsion in the aggregate and becomes solid.From the viewpoint of intensity, each layer of the thickness on lower floor and upper strata is about 10～35cm, and integral thickness reaches 20～70cm.On said roadbed, the basic unit and the top layer of asphalt mixtures is set usually massively, through the interlayer adhesives to form the asphalt mixtures layer.
What is called is mated formation and is meant 4 layers of structure that are made up of " roadbed+asphalt mixtures layer ".The asphalt mixtures layer generally is 2 layers of structure that are made up of basic unit and top layer, and the thickness of each layer is about 4～5cm, makes durable in vehicular traffic.From the viewpoint of durability, the laying depth of the road of mating formation is confirmed according to the intensity (CBR value) and the traffic volume (N value) of roadbed.In addition, each layer thickness of roadbed or asphalt mixtures layer is typically designed to about 2～3 times of maximum particle diameter of contained aggregate separately.That is, when the maximum particle diameter of the aggregate in being included in the asphalt mixtures layer is about 20mm, the Thickness Design written treaty 4～5cm of each layer, and integral body reaches 8～10cm approximately.
But; This is also according to required character and state; The maximum particle diameter aggregate that will be included in the size distribution on about 4～5cm top layer sometimes is formed on the close granularity layers of about 13mm, the maximum particle diameter aggregate of the size distribution of the basic unit that is included in same thickness is formed on the coarseness layer of about 20mm.And the thickness of basic unit is set to corresponding to the number of the traffic volume has elastic force.For this reason, be the thickness setting of basic unit 4～35cm sometimes.Detailed will narration in the back, mat formation model and section thereof shown in Figure 15 (1) are typical case.Figure 15 (1) is used for multilayer elastic to resolve (GAMCS: standard, that be applicable to arterial road (national highway, land-service road) the in Japan model of mating formation building association of civic organization).For paving structure, roadbed that the upper strata by the lower floor of 35cm and 25cm constitutes is set and the asphalt mixtures layer that constitutes by the basic unit of the top layer of 5cm and 12cm and constituting on roadbed.This belongs to the situation that the traffic volume is divided into C traffic (1000～3000/day, direction), is used to represent the coefficient of elasticity of distortion repellence of each layer of roadbed and asphalt mixtures layer, and promptly restoring force (E) is as shown in the table of Figure 15 (1).
At this, re-laying of asphalt mixtures layer is described.
Basic unit and top layer are by constituting as the aggregates such as pitch, sand and rubble of cementing agent (binding material), the stone flour (filler) that conduct is used to bury underground the limestone powder in gap between the aggregate.Common composition is that aggregate is about 90%, is about 5～8% as the pitch of cementing agent, and remaining be filler.
The size of aggregate particle is called granularity, and the result who carries out classification after the sieve screening of state with all size with its mixing is called size distribution, and Fig. 3 shows its example.In the chart, transverse axis is represented the size of sieve mesh, and the longitudinal axis is represented through the weight percent of the material of all size sieve mesh (through weight percent).
In addition, comprise: give birth to, i.e. the pitch crossed of upgrading not as the pitch of the cementing agent (binding material) of aggregate; With the upgrading pitch that is added with modification agents such as rubber, resin in order to improve viscosity.Observing the relation of temperature shown in Figure 4 and viscosity can know, above-mentioned two kinds of pitch are reduced viscosity when 180 ℃ of left and right sides all, under the situation of not destroying aggregate, makes the aggregate of asphalt mixtures disperse.That is, aggregate becomes singulated with the state that is covered by pitch.On the other hand, along with temperature drops to 100 ℃, the viscosity of pitch can improve, and the aggregate that is covered by pitch begins to become granuleization, when normal temperature, is cured fully.
As shown in Figure 1; Mat formation road owing to bear vertical and the compression of horizontal direction and the bending of tensile stress due to the frequent traffic of vehicle for a long time; And the road surface damaged, and be exposed under wind and rain or the outside air temperature, typically can take place " rut seal depression " according to the softening or liquidation of pitch, cementing agent; Or the crackle due to freezing etc., the road surface becomes uneven and deterioration.The pavement recycling worker method of road of mating formation generally is employed in the basic unit and top layer of the asphalt mixtures layer that constitutes 2 layers of structure, only is directed against the heated type pavement recycling worker method (HIR:Hot In-place Recycling) of the top layer part of about 4～5cm.
Particularly, a kind of is mixing again (Re-mixture) mode shown in Fig. 5 (1).This mode; The top layer part of scarifying asphalt mixtures layer through thermoplastic; Make it to become asphalt mixtures; And on this asphalt mixtures, add and mixed regeneration agent and new asphalt mixtures and make it to become the recovered asphalt mixture, pave afterwards and the said recovered asphalt mixture of compacting, thereby regenerate on the top layer of recovered asphalt mixture layer.
Another kind is the road crust regeneration shown in Fig. 5 (2).This mode; The top layer part of scarifying asphalt mixtures layer through thermoplastic; Make it to become asphalt mixtures, and on this asphalt mixtures, only add and mixed regeneration agent and paving, after the top layer with the recovered asphalt mixture layer; Add new asphalt mixtures on this top layer and pave and compacting, thereby make the top layer of asphalt mixtures layer form two-layer.Obviously, the asphalt mixtures layer after the regeneration is compared before the regeneration, and its thickness increases.Point out that in passing the advantage of heated type pavement recycling worker method is, under any circumstance also can not destroy the aggregate that is included in the asphalt mixtures layer, and through being used to regeneration again and strengthening the asphalt mixtures layer.
Nonetheless; Crackle or the damage of road of mating formation also comprises from the boundary face of interlayer and takes place and spread the situation to top successively; Under many situation; As observed, crackle or damage spread from the road surface to the top layer that surpasses about 6～10cm and the degree of depth of the boundary face between the basic unit, or corresponding to the degree of depth of the asphalt mixtures layer of this degree of depth.Be used in the road surface heating means of well-known pavement recycling worker methods such as aforesaid hybrid mode again or road crust regeneration; Heat energy enough is penetrated under the situation of not lighting at short notice, apart from the degree of depth on road surface restriction is arranged, so its applicable object is limited at top layer or its part.Thereby; When using these pavement recyclings worker method; The degree of depth of the basic unit of asphalt mixtures layer part or corresponding to this degree of depth, be positioned at apart from the crackle of the road of mating formation of road surface 6～10cm degree of depth or damage by under the situation of a residual part top layer part of a recovered asphalt mixture.
In addition, at United States Patent (USP) the 4th, 534; Put down in writing following mode in No. 674 manuals; Promptly be conceived to repair the road of mating formation crackle or damage, hybrid mode is applicable to the mode of road crust regeneration again, particularly, in the asphalt mixtures of scarifying, appends the pitch regenerative agent; And add the new asphalt mixtures of heated condition and mix and pave, thereby form new top layer.And even in this case, the degree of depth that can repair existing asphalt mixtures layer is by the end of 5cm to 6cm, and its degree of depth is still restricted.In any case; The life-span of the road of mating formation of regeneration is temporary; To the degree of depth of the basic unit of the asphalt mixtures layer that surmounts the road of mating formation and the boundary face between the top layer or corresponding to the degree of depth apart from road surface 6～10cm of this degree of depth; Be difficult in that the mode through cyclic regeneration thoroughly changes the life-span on the road surface, up to the present, the road of mating formation of this character and state can only depend on for example rebuilding (reconstruct) worker method.
The application's applicant discloses following heating means and device in No. the 4024293rd, Japan Patent; Promptly; Be used in the road surface heater of the hot blast of 600～700 ℃ of the jet surfaces of asphalt mixtures layer moving; The surface temperature on road surface is remained on about 250 ℃; Do not light the degree of depth that can make the degree of depth of the boundary face between heat leak to basic unit that surmounts the asphalt mixtures layer and the top layer under the situation of pitch or be equivalent to the asphalt mixtures of this degree of depth at short notice, thus on the road surface cyclic regeneration asphalt mixtures layer.The applicant utilizes this heating means and device; To arriving to the degree of depth of the boundary face between basic unit that surmounts the asphalt mixtures layer and the top layer or being equivalent to the damage or the deterioration of the degree of depth of the asphalt mixtures layer of this degree of depth, conscientiously examined the realization that re-lays worker's method that can significantly improve the road life of mating formation.
Non-patent literature 1: " the regeneration brief guide of mating formation " (civic organization Japan road association)
Patent documentation 1: No. 4024293 communique of Japan Patent
Patent documentation 2: United States Patent (USP) the 4th, 534, No. 674 manuals
Summary of the invention
Pitch is made up of the asphaltene (asphaltene) of particulate component and the malthenes (malthene) of oil component.If mat formation by deterioration, then the malthenes of oil component reduces and hardens, and the ratio of the particulate component asphaltene in malthenes that swims can increase.Its result, the viscosity of pitch can descend.At this, the top layer has identical characteristic with basic unit, and just degree is different.And according to the deterioration of mating formation, the aggregate that is included in the asphalt mixtures layer can take place to reduce or breakage owing to abrasion.The object that will be used as old material as the asphalt mixtures of the generating material of mating formation and utilize preferably should be the asphalt mixtures layer that comprises the integral body of top layer and basic unit.
Utilize above-mentioned heating means and device; Promptly at short notice; In the degree of depth that makes the boundary face between heat leak to basic unit that surmounts the asphalt mixtures layer and the top layer under the situation of not lighting pitch or be equivalent to the degree of depth of the asphalt mixtures layer of this degree of depth; Thereby make the boundary face between heat leak to basic unit that surmounts the asphalt mixtures layer and the top layer the degree of depth or suitable therewith about 6～10cm the degree of depth and soften, as shown in Figure 6 with this, to scarifying to the degree of depth that surmounts the boundary face between basic unit and the top layer or be equivalent to the asphalt mixtures of this degree of depth; Not only add the pitch regenerative agent; But also add the aggregate of big particle diameter or be attached with pitch aggregate, or contain certain new material in the asphalt mixtures of size distribution of big diameter aggregate, and and after constituting the reinforcement asphalt mixtures, on the rest layers of the remaining asphalt mixtures layer of scarifying with it mixing; The even reinforcement asphalt mixtures in shop, thus coefficient of elasticity formed greater than the rest layers of asphalt mixtures layer and contain the intermediate layer of big diameter aggregate.At this, the intermediate layer of containing big diameter aggregate is called " big particle diameter strengthening course ".Then; Be included in also that big particle diameter strengthening course upper berth is even to be used for the asphalt mixtures on new top layer and to form new top layer; And both compactings that will be in the accumulation of heat state are the step of one, the object of the present invention is to provide the aforesaid self-propelled vehicle system that re-lays the method for asphalt mixtures layer and be used for this method.
The present invention with the technical characterictic stated after having realizes above-mentioned problem based on following opinion.Promptly; Through making self-propelled vehicle system voluntarily; The surface of heating asphalt mixtures layer; Make the thickness of the boundary face between heat leak to basic unit that surmounts the asphalt mixtures layer and the top layer or be equivalent to this thickness said asphalt mixtures layer thickness and soften; And to carrying out scarifying and make it to become old asphalt mixtures until the degree of depth of the boundary face between basic unit that surmounts the asphalt mixtures layer and the top layer or till being equivalent to the degree of depth of said asphalt mixtures layer of this degree of depth; Add with not by the aggregate of the particle diameter temperature pre-stored of granuleization, big or be attached with the aggregate of pitch to this asphalt mixtures, perhaps contain any first material in the asphalt mixtures of size distribution of big diameter aggregate, and mix and form the reinforcement asphalt mixtures; To the even said reinforcement asphalt mixtures in the rest layers upper berth of the remaining asphalt mixtures layer of scarifying; To form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of rest layers, add with not by i.e. second new material of the asphalt mixtures that is used to form new top layer of the temperature pre-stored of granuleization to this big particle diameter strengthening course again, and even this second new material in shop and form new top layer; With big particle diameter strengthening course of accumulation of heat state one compacting and new top layer, can on the road surface, re-lay the asphalt mixtures layer of the road of mating formation in view of the above continuously.
Through making self-propelled vehicle system voluntarily; The asphalt mixtures layer of road of will mating formation repaves the method for being located at the road surface continuously; It is characterized in that said method comprises: (a) thermoplastic step; Heat the surface of said asphalt mixtures layer, make the degree of depth of the boundary face between heat leak to basic unit that surmounts said asphalt mixtures layer and the top layer or be equivalent to this degree of depth said asphalt mixtures layer the degree of depth and soften; (b) scarifying step, to surmount be heated and the degree of depth of the said boundary face of softening said asphalt mixtures or be equivalent to the degree of depth of said asphalt mixtures layer of this degree of depth till carry out scarifying and form old asphalt mixtures; (c) first adds step; To said old asphalt mixtures through scarifying; Interpolation to be to be pre-stored in the aggregate of particle diameter in the device that prestores, big by the temperature of granuleization or to be attached with the aggregate of pitch, perhaps contains any first new material in the asphalt mixtures of size distribution of big diameter aggregate; (d) blend step mixes the said old asphalt mixtures that is added with said first new material, and forms the reinforcement asphalt mixtures; (e) big particle diameter strengthening course forms step, in said scarifying step by scarifying after on the rest layers of remaining said asphalt mixtures layer, the even said reinforcement asphalt mixtures in shop is to form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of said rest layers; (f) second adds step, on formed said big particle diameter strengthening course, adds not to be pre-stored in asphalt mixtures in the device that prestores, that be used to form new top layer, i.e. second new material by the temperature of granuleization; (g) new top layer forms step, and the shop is spared said second new material and formed new top layer, and this step forms step with described big particle diameter strengthening course and is associated; (h) compacting step, under the accumulation of heat state, the one compacting is formed on said big particle diameter strengthening course and the said new top layer on the said rest layers.
Also comprise before the said scarifying step: new material is moved into step, with said first new material and said second new material that be transported into outside the said self-propelled vehicle system different opportunitys, moves into respectively in the device that prestores on said different opportunitys.
Said first new material be the aggregate of comparing the maximum particle diameter that is included in said asphalt mixtures layer have the aggregate of bigger particle diameter or be attached with pitch aggregate, or contain in the asphalt mixtures of size distribution of the bigger aggregate of the aggregate particle diameter of comparing the maximum particle diameter that is included in said asphalt mixtures layer any one.
Be added with the said reinforcement asphalt mixtures of said first new material; Include the aggregate that the aggregate that will compare the maximum particle diameter that is included in said asphalt mixtures layer has bigger particle diameter, its content is for comprise about 5%～35% from said reinforcement asphalt mixtures on the whole.
Said blend step also comprises: regenerative agent adds step, when the said old asphalt mixtures that is added with said first new material is mixed, adds the pitch regenerative agent.
Said second new material contains and the aggregate that is included in the size distribution that aggregate the had size distribution much at one of said asphalt mixtures layer.
Said big particle diameter strengthening course forms step and also comprises: the interlayer bonding step, and scatter pitch emulsion or be used to improve the material of water proofing property and cementability to said rest layers, thus bonding said rest layers and said big particle diameter strengthening course.
The asphalt mixtures layer of road of being used for mating formation repaves the self-propelled vehicle system of being located at the road surface continuously; It is characterized in that comprising: preheating vehicle (A); This preheating vehicle (A) comprises heater; The mat formation surface of said asphalt mixtures layer of road of this heater heating, make the boundary face between heat leak to basic unit that surmounts said asphalt mixtures layer and the top layer the degree of depth or be equivalent to this degree of depth said asphalt mixtures layer the degree of depth and soften; Milling vehicle (B), this milling vehicle (B) comprises: first tank, with big diameter aggregate or be attached with the aggregate of pitch, perhaps contain any first new material in the asphalt mixtures of size distribution of big diameter aggregate, not stored by the temperature of granuleization; The scarifying device, until surmount be heated and the degree of depth of the said boundary face of softening said asphalt mixtures layer or be equivalent to the degree of depth of asphalt mixtures layer of this degree of depth till carry out scarifying, thereby make it to become old asphalt mixtures; First adding set, with discharge from said first tank, add said old asphalt mixtures to said first new material of not stored by the temperature of granuleization; Stir vehicle (C), this stirrings vehicle (C) comprising: second tank is second new material with the asphalt mixtures that is not used to form new top layer by the temperature pre-stored of granuleization; Mixing arrangement receives and mixes the said old asphalt mixtures that is added with said first new material, to form the reinforcement asphalt mixtures; First ironing machine, on the rest layers of remaining said asphalt mixtures layer, the even said reinforcement asphalt mixtures in shop is to form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of said rest layers after by the scarifying of said scarifying device; Second adding set, on formed said big particle diameter strengthening course, add discharge from said second tank, with not by said second new material of the temperature pre-stored of granuleization; Second ironing machine that is associated with first ironing machine is used to spread even said second new material that adds, to form new top layer.
Said self-propelled vehicle system also comprises Roller compaction device (D), with the state one compacting of accumulation of heat be formed on the said rest layers said big particle diameter strengthening course be formed on the said new top layer on this big particle diameter strengthening course.
Said milling vehicle (B) also comprises: discharger is gone in a centre, receives and discharge said first new material and said second new material that are transported into outside the said self-propelled vehicle system on different opportunitys; The new material that comprises at least two continuous transport paths is moved into device; Has switching device shifter on the said transport path, to be used for moving into said first new material and said second new material of being gone into the discharger discharge from said centre to said first tank and said second tank respectively on said different opportunitys; Wherein, When being gone into said first new material from said centre discharger when moving into said first tank; Continuous two transport paths that said switching device shifter makes said new material move into device cut off and form and move into mouth; By the formed said mouth of moving into said first new material is moved into said first tank; And when being gone into said second new material from said centre discharger when moving into said second tank; Said switching device shifter cuts out and is formed on the said mouth of moving into that said new material is moved into device, thereby connects said two transport paths and form a transport path, makes said second new material gone into discharger from said centre thus and moves into said second tank via a said transport path.
Said first new material be the aggregate of comparing the maximum particle diameter that is included in said asphalt mixtures layer have the aggregate of bigger particle diameter or be attached with pitch aggregate, or contain in the asphalt mixtures of size distribution of the bigger aggregate of the aggregate particle diameter of comparing the maximum particle diameter that is included in said asphalt mixtures layer any one.
Be added with the said reinforcement asphalt mixtures of said first new material; Include the aggregate that the aggregate that will compare the maximum particle diameter that is included in said asphalt mixtures layer has bigger particle diameter, its content is for comprise about 5%～35% from said reinforcement asphalt mixtures on the whole.
Said second new material contains and the aggregate that is included in the size distribution that aggregate the had size distribution much at one of said asphalt mixtures layer.
Said stirring vehicle (C) also comprises the regenerative agent adding set, to be used for when being added said first new material by the said old asphalt mixtures of scarifying, adding the pitch regenerative agent.
Said stirring vehicle (C) also comprises the 3rd tank, to be used for the material that pre-stored is used for the pitch emulsion of bonding said rest layers and said big particle diameter strengthening course or is used to improve water proofing property and cementability.
Said stirring vehicle (C) also comprises first memory space that is formed between said mixing arrangement and said first ironing machine, to be used to regulate the quantity delivered of the said reinforcement asphalt mixtures that is provided to said rest layers.
Said stirring vehicle (C) also comprises second memory space that is formed between said first ironing machine and said second ironing machine, to be used to regulate the quantity delivered of said second new material that is provided to said big particle diameter strengthening course.
Description of drawings
Fig. 1 is used to represent that heavy traffic brings the model of the influence that pitch mats formation.
The profile that Fig. 2 mats formation for general pitch.
Fig. 3 is the particle size distribution figure of the aggregate of asphalt mixtures.
Fig. 4 is the graph of a relation of the temperature and the viscosity of pitch.
Fig. 5 is used to represent the hybrid mode again (1) of heated type road crust regeneration operation and the figure of regeneration (2).
Fig. 6 for according to of the present invention through being formed for the big particle diameter strengthening course of reinforcement asphalt mixtures layer, the model that re-lays continuously with road surface at the road of mating formation.
Fig. 7 is the block diagram according to the asphalt mixtures layer that on the road surface, re-lays the road of mating formation continuously of the embodiment of the invention.
Fig. 8 is the skeleton diagram of self-propelled vehicle system of asphalt mixtures layer that is used on the road surface, re-laying continuously the road of mating formation according to the embodiment of the invention.
Fig. 9 is the probability graph of heater body 100 of preheating vehicle A that is used to constitute self-propelled vehicle system according to the embodiment of the invention.
Figure 10 is formed with the skeleton diagram of the device body of moving into mouthful 300 of first new material for the milling vehicle B that is used for constituting self-propelled vehicle system according to the embodiment of the invention.
Figure 11 is for being formed with the skeleton diagram of the device body of moving into device 300 of second material according to the milling vehicle B that is used for constituting self-propelled vehicle system of the embodiment of the invention.
Figure 12 is the skeleton diagram of the device body 300 that is made up of other dual link vehicle according to the milling vehicle B that is used for constituting self-propelled vehicle system of the embodiment of the invention.
Figure 13 is the skeleton diagram of device body 500 of stirring vehicle C that is used to constitute self-propelled vehicle system according to the embodiment of the invention.
Figure 14 is size distribution analysis result and the particle size distribution figure that cooperates the aggregate of " No. 4 quarrying " new material to the asphalt mixtures of the part (thickness is 2cm) of top layer (thickness is 4cm) and basic unit with 7 to 3 ratio.
Figure 15 is standard the mat formation paving structure and the multilayer tomography analysis result of model.
Paving structure and multilayer tomography analysis result that Figure 16 regenerates with the new asphalt mixtures with aggregate size distribution much at one for the top layer of the paving structure of model that standard is mated formation.
Figure 17 be for will surmounting mat formation top layer and the asphalt mixtures layer of the boundary face 10cm degree of depth between the basic unit of paving structure of model of standard, the paving structure and the multilayer tomography analysis result that re-lay with method of the present invention.
Figure 18 is the synoptic diagram that is used for the comparison paving structure.
Figure 19 is the sequence of operation figure of preparation method of model of mating formation.
Figure 20 compressive strain that to be the testing machine that utilizes defined in the crooked test of concrete carried out through load such as 3 branch points such as grade and the test synoptic diagram of stretcher strain.
Figure 21 resolves the measured value that compares test for two-layer model and the paving structure that contains the three layer model of big particle diameter strengthening course to existing worker's method based on the multilayer tomography.
Figure 22 illustrates the figure that is used in paving structure test, the full scale test body of mating formation that carries out according to the reinforcing effect of mating formation of big particle diameter strengthening course for quantitative assessment.
Figure 23 is used to illustrate the figure of quality test content of test body of mating formation.
Figure 24 is when being illustrated in the fatigue failure number of times that calculates the test body of mating formation, and is used to calculate the figure of calculating formula of position and the fatigue failure number of times of stretcher strain and compressive strain.
Figure 25 is result's the figure that the quality test of the test body of mating formation is shown.
Figure 26 illustrates the figure that tests the surperficial displacement of mating formation of body according to mating formation of FWD test.
Figure 27 illustrates being utilized in the mat formation figure of coefficient of elasticity of the asphalt mixtures that the test test body that employed material is made during body measures of construction.
Figure 28 is the figure of value that stretcher strain and the compressive strain of the test body of mating formation are shown.
Figure 29 illustrates being recorded in mat formation the plan traffic volume of design and construction in the guide and the relation between the fatigue failure number of times, and value that will stretcher strain shown in Figure 28 and compressive strain is updated to the figure of the fatigue failure number of times that respectively mating formation of acquisition in the calculating formula shown in Figure 24 test body.
The specific embodiment
Below, the asphalt mixtures layer that specifies the road of will mating formation according to the preferred embodiment of the invention with reference to Fig. 7 to Figure 21 repaves the method for being located at the road surface and the self-propelled vehicle system that is used for this method continuously.
Fig. 7 shows the whole step that repaves the method for being located at the road surface according to the asphalt mixtures layer of the road of will mating formation of the embodiment of the invention continuously.This method comprises: thermoplastic step (below be called " thermoplastic step "); The surface of heating asphalt mixtures layer, make the degree of depth of the boundary face between heat leak to basic unit that surmounts the asphalt mixtures layer and the top layer or be equivalent to this degree of depth the asphalt mixtures layer the degree of depth and soften; Scarifying step (below be called " scarifying step "), to surmount be heated and the degree of depth of the basic unit of softening asphalt mixtures and the boundary face between the top layer or be equivalent to the degree of depth of said asphalt mixtures layer of this degree of depth till carry out scarifying and form old asphalt mixtures; First adds step (below be called " first adds step "); To by the old asphalt mixtures of scarifying, add be not pre-stored in the aggregate of particle diameter in the device that prestores, big by the temperature of granuleization or be attached with pitch aggregate, or contain in the asphalt mixtures of size distribution of big diameter aggregate certain as first new material; Blend step (below be called " blend step ") mixes the old asphalt mixtures that is added with first new material, and forms the reinforcement asphalt mixtures; Big particle diameter strengthening course formation step (below; Be called " big particle diameter strengthening course forms step "); By on the rest layers of the remaining asphalt mixtures layer of scarifying, the even reinforcement asphalt mixtures in shop is to form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of rest layers in the scarifying step; Second adds step (below be called " second adds step "), on formed big particle diameter strengthening course, adds not to be pre-stored in asphalt mixtures in the device that prestores, that be used to form new top layer, i.e. second new material by the temperature of granuleization; New top layer forms step (below be called " new top layer forms step "), even second new material in shop and form new top layer, and this step is associated with big particle diameter strengthening course formation step; Compacting step (below be called " compacting step "), under the accumulation of heat state, the one compacting is formed on the big particle diameter strengthening course and new top layer on the rest layers.
Said method can also comprise: the new material before the scarifying step is moved into step (below be called " new material is moved into step "); With first new material and second new material that be transported into outside the self-propelled vehicle system different opportunitys, move into respectively in the device that prestores on different opportunitys; Regenerative agent adds step (below be called " regenerative agent interpolation step "), when the old asphalt mixtures that is added with first new material is mixed, adds the pitch regenerative agent; Interlayer bonding step (below be called " interlayer bonding step ") forms step at big particle diameter strengthening course, and scatter pitch emulsion or be used to improve the material of water proofing property and cementability to rest layers, thus bonding rest layers and big particle diameter strengthening course.
Fig. 8 shows a kind of embodiment of the self-propelled vehicle system that is used to implement above-mentioned each step.This self-propelled vehicle system is by preheating vehicle A, milling (miller) vehicle B and stir vehicle (mixer) C formation, in case of necessity, can also comprise roll milling wheel D.Below, with each inscape of vehicle and function together, the self-propelled vehicle system of asphalt mixtures layer that is used on the road surface, re-laying the road of mating formation continuously of present embodiment is described.
As shown in Figure 8, the heater of preheating vehicle A is opposed and be provided with the road surface between the tire of the front and back of vehicle, operates this heater this operator who is controlling vehicle.Fig. 9 shows corresponding to the observed from the side heater body 100 of vehicle moving direction, in this detailed.The high-temperature combustion gas (solid arrow) that section radiates for a plurality of spray-holes 130 of circular pipeline (duct) 120 is the fuel of carrying to high-temperature combustion gas generation portion 110 according to burner (burner) 140 and Air mixing gas to be lighted be heated to about 550 ℃～about 750 ℃, preferably is heated to about 650 ℃ high-temperature combustion gas.The center tube 160 of the part of the collection portion 150 through constituting high-temperature combustion gas, at certain intervals along the length direction that moves be arranged side by side and constitute the curtain shape, supply with high-temperature combustion gas as the section of the part of collection portion 150 equably for each circular pipeline 120.Thereby open surface 180 and the heating region between the pitch surface at cover body (hood) 170 form the high-temperature combustion gas layer.Then; After high-temperature combustion gas conducts heat; Become and reclaim burning gases (dotted line arrow); Be the formed gap of periphery of each circular pipeline 120 according to the flow through section of curtain shape of getter device 190, be drawn into burning gases circulating line 200 via the inside of cover body 170, and be delivered to high-temperature combustion gas generation portion 110.
And then; Preheating vehicle A advances with the speed that about 2～5m/ divides; Meanwhile form about 550 ℃～about 750 ℃ high-temperature combustion gas layer on the surface of the road of mating formation; And its surface maintained 230～260 ℃ all the time, thus under the state of not lighting pitch, make the degree of depth of heat leak to the boundary face on basic unit that surmounts the asphalt mixtures layer and top layer or be equivalent to the degree of depth of about 6～10cm of this degree of depth, can make innermost temperature reach 50～60 ℃.Realize thermoplastic step of the present invention thus, thereby the aggregate of scarifying device 340 scarifying asphalt mixtures layer under the situation of not damaging and destroying of the milling vehicle B that states after making and make it to become old asphalt mixtures can be implemented the scarifying step with this.Certainly, unquestionable, heater is not to be confined to above-mentioned form, so long as have the heater of said function, any can employing.
As shown in Figure 8, milling vehicle B is controlling the device that the operator of this vehicle operates.Figure 10 shows corresponding to the observed from the side device body 300 of the moving direction of vehicle.Milling vehicle B comprises: first tank 320; Big diameter aggregate that will outside self-propelled vehicle system, be transported into or the aggregate that is attached with pitch, or contain first new material 310 arbitrarily the asphalt mixtures of size distribution of big diameter aggregate through large truck 400A; With not by the temperature of granuleization, promptly about 120～150 ℃ temperature storage; Scarifying device 340; Until surmount heated by said heater 100 and the degree of depth of the basic unit of softening asphalt mixtures layer 330 and the boundary face between the top layer or be equivalent to the degree of depth of asphalt mixtures layer of this degree of depth till carry out scarifying, thereby make it to become old asphalt mixtures 331; First adding set 350, with discharge from said first tank 320, add to by the asphalt mixtures 331 of scarifying with first new material of not stored 310 by promptly about 120～150 ℃ temperature of the temperature of granuleization.
More concrete inscape to milling vehicle B describes as follows.Shown in figure 10; First new material, 310 usefulness that large truck 400A is transported into do not have illustrated equipment (plant) to produce; It is required in the amount that re-lays of a company; In the temperature of keeping 120～150 ℃,, be contained in a centre and gone into discharger 400 promptly not by under the situation of the temperature of granuleization.First new material 310 that is held is carried according to first conveyer 410 and is moved into first tank 320.At this, the top of first tank 320 is formed with to be moved into mouthful 420, the first new materials 310 and moves into mouthfuls 420 via this and move into from the input port 321 of first tank 320.Moving into mouthfuls 420 can be closed according to first conveyer 410 and second conveyer 430 slidably.Second conveyer 430 is set to link with the 3rd conveyer 440.And then of the back according to moving into mouthfuls 420 close, first conveyer 410 and the 3rd conveyer 440 second transmission device 430 through sliding according to actuator (actuator) etc. constitutes a transport 450.
Then; Shown in figure 10; Scarifying device 340 has the rotary scarifier (road surface scarifying pawl) that is set to two groups of spiral helicine, front and back from the left and right sides of the road width direction of mating formation to central authorities; This scarifier is that for example two pulverizing (grinding) install 341 and 342, carries out the interior rotation of surveying in the face of being provided with mutually according at least two axles that with the oil pressure are drive source usually.In view of the above, be heated and the degree of depth of the basic unit of softening asphalt mixtures layer 330 and the boundary face between the top layer or the degree of depth that is equivalent to the asphalt mixtures layer of this degree of depth are carried out scarifying, in the road Central Line, form old asphalt mixtures 331 with the ridge shape until surmounting.Propose in passing, shown in other embodiment of the milling vehicle B of Figure 12, the scarifying device 340 that is made up of two reducing mechanisms 341,342 can be arranged on the front vehicles B1 of duplex vehicle (B1+B2).
In addition, preferably attemperator is set at first tank 320 that is used for pre-stored first new material 310.First new material 310 of stored preheat mode is carried according to set within it the 4th transmitting device 351 of first adding set 350 of portion of an end from the outlet opening 322 of first tank 320, and is added old asphalt mixtures 331 to.
Before vehicle C is stirred in explanation,, each inscape according to the milling vehicle B of other large truck 400B when second new material of stating after discharger 400 is transported into 510 is gone in the centre is described as follows with reference to Figure 11.Second new material, 510 usefulness do not have illustrated equipment (plant) to produce, and it is required is keeping about 120～150 ℃ temperature in the amount that re-lays that connects, and promptly keeps not by under the situation of the temperature of granuleization, is contained in a centre and is gone into discharger 400.At this moment, second conveyer 430 is moved into mouth 420 through sliding closing.Meanwhile, be connected with the 3rd conveyer 440 according to second conveyer, 430, the first conveyers 410 and form a transport 450.More specifically; When second new material 510 of being gone into discharger 400 in the middle of will being transported into according to large truck 400B is moved into second tank 520; The operator of milling vehicle B through operation slidably the switching device shifter 460 of second conveyer 430 close and move into mouthfuls 420; First conveyer 410 is connected to the 3rd conveyer 440 through second conveyer 420, thereby forms a transport 450.Propose in passing, preferably the attemperator identical with first tank 320 also should be set at second tank 520.
Thus, second new material 510 is transported to second tank 520 that stirs vehicle C according to transport 450.And then; Clearly illustrate like Figure 10 and Figure 11; Discharger 400 is gone in centre to milling vehicle B; Outside self-propelled vehicle system, be transported into first new material 310 and second new material 510 on different opportunitys, and move into first new material 310 and second new material 510 respectively to first tank 320 and second tank 520 on different opportunitys.
As shown in Figure 8, stirring vehicle C is the device of being operated by the operator who is controlling this vehicle equally.Figure 13 shows the observed from the side device body 500 of moving direction of relative vehicle.As stated; Stirring vehicle C comprises: second tank 520; To be transported into the asphalt mixtures that is used for new top layer of being gone into second new material 510 of discharger 400 to the centre according to the large truck 400B outside the self-propelled vehicle system, with about 120～150 ℃ not stored by the temperature of granuleization; The 5th conveyer 530 promotes and carries the old asphalt mixtures 331 that is added with first new material 310; Mixing arrangement 550, the old asphalt mixtures 331 of carrying and being added with first new material 310 to being raised receives and mixes, and makes it to become reinforcement asphalt mixtures 540; First ironing machine (screed) 580 on by the rest layers 560 of the remaining asphalt mixtures layer 330 of scarifying device 340 scarifyings, is paved reinforcement asphalt mixtures 540, to form the big particle diameter strengthening course 570 of coefficient of elasticity greater than the coefficient of elasticity of rest layers 560; Second adding set 590 on formed big particle diameter strengthening course 570, adds second new material 510 of discharging from second tank 520; Second ironing machine 610 that is associated with first ironing machine 580 is spared second new material, 510 shops of being added on big particle diameter strengthening course 570, thereby is formed new top layer 600.
In addition, stir vehicle C and also comprise: regenerative agent adding set 620 when mixing is added with the old asphalt mixtures 331 of first new material 310, is used to add the pitch regenerative agent; The 3rd tank 630, pre-stored are used for the pitch emulsion of bonding rest layers 560 and big particle diameter strengthening course 570 or are used to improve the material of water proofing property and cementability; Memory space 640 is provided with the two side between the mixing arrangement 550 and first ironing machine 580, be used to regulate the quantity delivered of reinforcement asphalt mixtures 540 to rest layers 560; Memory space 650 is provided with the two side between first ironing machine 560 and second ironing machine 610, be used to regulate the quantity delivered to second new material 510 of big particle diameter strengthening course 570.
Stir first ironing machine 580 and second ironing machine 610 of vehicle C, when the reinforcement asphalt mixtures 540 and second new material 510 are spared in the shop respectively, not only have the even function in shop usually, but also have the function of compacting.And then roll milling wheel D as shown in Figure 8 can be used in the situation of carrying out compacting as required more strongly.
Milling vehicle B that is pre-stored with first new material 310 and second new material 510 respectively and stirring vehicle C are linked to each other with preheating vehicle A; And make it to work together with the speed that 2～5m/ divides; Make the degree of depth of about 6～10cm of heat leak to asphalt mixtures layer 330 simultaneously; Make the bosom temperature of asphalt mixtures layer reach 50～60 ℃, with the thermoplastic step of this embodiment of the present invention, then; The aggregate of scarifying device 340 scarifying asphalt mixtures layer 330 under the situation of not damaging and destroying and make it to become old asphalt mixtures 331 can be accomplished the scarifying step with this.Below, each step of the present invention then is described.
Add step first, to being added first new material 310 by the old asphalt mixtures of scarifying.First new material 310 should be the aggregate of comparing the maximum particle diameter that is included in asphalt mixtures layer 330 have the aggregate of bigger particle diameter or be attached with pitch aggregate, or contain in the asphalt mixtures of size distribution of the bigger aggregate of the aggregate particle diameter of comparing the maximum particle diameter that is included in asphalt mixtures layer 330 any one.The reinforcement asphalt mixtures 540 that in ensuing blend step, is produced has the aggregate of bigger particle diameter with the aggregate of comparing the maximum particle diameter that is included in asphalt mixtures layer 330, comprises about 5%～35% on the whole.This is because when the amount of big diameter aggregate is 5% when following, can not obtain above the intensity based on the reinforcement of laying depth.In addition, when the amount of big diameter aggregate surpasses 35%, can break the balance of the size distribution of asphalt mixtures, thereby be difficult to form closely knit asphalt mixtures layer.In view of the above; Form in the step at the big particle diameter strengthening course that is continued, on the rest layers 560 of asphalt mixtures layer 330, the even reinforcement asphalt mixtures in shop; Thereby as the layer that has utilized asphalt mixtures layer 330 again; Though its thickness can increase, as after state, can form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of rest layers 560.At this, the structure that re-lays that has formed new top layer is in order to strengthen paving structure (Hot In-place Strengthening) through constructing big particle diameter strengthening course.
For Figure 14 detailed, this Figure 14 constructs big particle diameter strengthening course through adding new material to old asphalt mixtures, thus the result when strengthening paving structure.Data based on experimental data about the paving structure that is reinforced; Be recorded in Figure 18～Figure 21; But this result is to be that the thickness of the aggregate size distribution of 13mm is the top layer of 4cm and to have maximum particle diameter be that the thickness of the aggregate size distribution of 20mm is that about 2cm among the xcm carries out scarifying to having maximum particle diameter; Thereby the old asphalt mixtures that amounts to 6cm to thickness with 7 to 3 mixed and shop even as new material by particle diameter be the aggregate of 20～30mm constitute " No. 4 quarrying " time, measure its thickness and the result that draws.At this, integral thickness reaches 8.6cm.That is, compare by the asphalt mixtures layer of the 6cm of scarifying, thickness has increased 2.6cm.
Figure 15 is with putting down into 11 years laying constructions in the standard of arterial road (national highway, local road) that is applicable in Japan of the purple open country of building of the nine divisions of China in remote antiquity-Gu He line model of mating formation, and utilizes multilayer elastic to resolve (GAMCS: the result who estimates building association of civic organization) in 15 years putting down into.Paving structure constitutes by the roadbed that constitutes with the upper strata of the lower floor of 35cm and 25cm on the roadbed with the asphalt mixtures layer that the basic unit of the top layer of 5cm and 12cm constitutes.This is the situation of the traffic volume when dividing into C traffic (1000～3000/day, direction); Be used to represent the coefficient of elasticity of distortion repellence of each layer of roadbed and asphalt mixtures layer, i.e. recuperability (E) is shown in the table of Figure 15; Its result is also surplus 1 year top layer life-span, and the whole life-span is 5 years.
Propose in passing, the top layer Life Prediction be one day, during the above-mentioned C traffic volume of a direction 3000 vehicle traffic volume, with the destruction number of times (N of asphalt mixtures f) divided by the value of 3000 (platform) * 365 (day).At this, asphalt mixtures is destroyed number of times (N f) calculate through following fatigue failure reference type (source: Japanese road association pitch is laid main points in December, 1992).
(formula 1)
N f＝8.108×10 (M-3)/ε t 3.291×E 0.854
At this, ε tBe the stretcher strain below the asphalt mixtures layer; E is the coefficient of elasticity (kgf/cm of asphalt mixtures 2); M is the void content (V of asphalt mixtures V) and pitch amount (V b) function, by formula M=4.84 * { [V b/ (V V-V b)]-value that 0.69} calculates.
Then; Figure 16 is to be the top layer part of 5cm with the mat formation thickness of model of above-mentioned standard only; The model of mating formation when for example regenerating with mixing worker's method is again divided at the same traffic volume under the condition of C traffic, utilizes same multilayer elastic to resolve the result who estimates.The coefficient of elasticity on top layer before regenerate 24,000kgf/cm 2Being reinforced is 35,000kgf/cm 2But top layer Life Prediction value only is 2 years.Compare the situation of Figure 15, the life-span has only prolonged 1 year.This master pattern shows by the state of deterioration, to such an extent as to have to change basic unit and top layer according to rebuilding worker method.
Corresponding to this; Figure 17 has represented the result about the multilayer elastic parsing of the road of mating formation as follows; Paving structure when promptly dividing into the C traffic for the same traffic volume; With 7 to 3 the ratio same with the situation of Figure 14; The thickness of scarifying from the road surface to the 10cm that surmounts the boundary face between basic unit and the top layer, to this interpolation and to mix by particle diameter be that " No. 4 quarrying " that the aggregate of 20～30mm constitutes constitutes the reinforcement asphalt mixtures, formation thickness is the big particle diameter strengthening course of 7cm on remaining rest layers after the scarifying thus; Thereby be that 5cm, basic unit are that 5cm and whole changes on the asphalt mixtures layer of 14cm thickness for the thickness of 10cm with the top layer; Add second new material, thereby according to so second adding step to form thickness be the new top layer of 3cm, and under the state of accumulation of heat, be one with big particle diameter strengthening course with new top layer compacting.
Situation to Figure 15 and Figure 16 compares and can know; The thickness of double-layer structure is that the asphalt mixtures layer of 17cm repaves the asphalt mixtures layer that the thickness of being located at three layer construction is 24cm; Thereby increase according to the thickness of the 4cm of first new material and according to the thickness of the 3cm of second new material; But if the same traffic volume of hypothesis is divided into the situation of C traffic; Then according to the coefficient of elasticity for vertical and horizontal stress bending of the heavy traffic flow of pointing out at first, the old basic unit of coarseness layer is 24,000kgf/cm 2, and the coefficient of elasticity of big particle diameter strengthening course reaches 50 more than 2 times, 000kgf/cm 2Measured value shown in Figure 21 has also proved this point.Its result can significantly extend to 11 years with the top layer life-span in 5 years to 6 years.That is, compare use in the past according to heated type top layer regeneration operation the time situation, the present invention has the significant beneficial effect that can the life-span be prolonged 5～6 years.
Shown in figure 21, these are proved by experimental data.Concrete bending strength experiment, is abideed by " the crooked strength test method of JIS A 1106 concrete " according to 2 concentrated load tests and is carried out.Bending strength acts on test with flexural stress and occurs in the inner maximum stress in bend (tensile stress) of test body during body and define, and the hypothesis test body is when being elastic body, with following formula calculating.
(formula 2)
σ b＝M/Z＝(Pl/6)/(bd 2/6)＝Pl/bd 2[N/mm 2]
At this, M is the maximum bending moment (moment) that is created in the test body; Z is section factor [mm 3]; P is maximum load [N]; L be bottom length of support [mm] (300mm); B is the section width [mm] of test body, and d is the profile height [mm] (b, d are respectively 100mm) of test body.
The result confirms as, and employed coefficient of elasticity is similar with the coefficient of elasticity that calculates from bend test in the numeric value analysis of expression material behavior.In addition, observe " coefficient of elasticity that is synthesized " and can know that the two-layer model in worker's method was 3,395N/mm in the past 2With respect to this, the same coefficient of elasticity that contains 3 layer models of big particle diameter strengthening course is 4,796N/mm 2, improved 1.41 times.At this moment, the bending strength of two-layer model is 6.41N/mm 2, relatively, the bending strength of 3 layer models is 8.1N/mm 2The result can confirm that reinforcing effect is about 1.3 times.At this,, can be easy to judge significant reinforcing effect from measured value even if consider to strengthen according to the reinforcement of laying depth.
Propose in passing, experimental data is a benchmark with following agreement (protocol).Its objective is in order to confirm the reinforcing effect of the paving structure that worker's method according to the present invention is constructed through laboratory experiment.The following stretcher strain of mating formation of compressive strain when measurement puts on load on the model of respectively mating formation before and after the reinforcement and pitch.
Then, Figure 18 shows the paving structure summary that is compared.
A reference value during the technical data of employed mixture reference " laying construction brief guide " and American National flexible pavement association (National Asphalt Pavement Association) " has used the test evaluation of the big particle diameter mixture of Marshall proportion design " is used the general proportioning that satisfies this a reference value.Below table, show the source of a reference value.
[table 1]
The mixture title The source
Close granularity asphalt mixtures (13) The test construction brief guide
Coarseness asphalt mixtures (20) The test construction brief guide
Big particle diameter asphalt mixtures (30) The NAPA reference
The mat formation preparation method of model is carried out according to the sequence of operation shown in Figure 19.
Test method is used the testing machine of in the crooked test of concrete, stipulating, props up point load with trisection and applies load, to measure compressive strain and stretcher strain.(with reference to Figure 20)
Measure the method for distortion, on the test body with below a plurality of distortion instruments of attaching (gauge) and image data.
Test number (TN) respectively carries out 3 times for the model of respectively mating formation.
Maximum load when breaking through body bending that pitch is mated formation compares, and existing worker's method is compared with worker's method according to the present invention.
Utilization results from the mat formation distortion of upper end and lower end of body of pitch; Go out the coefficient of elasticity of each layer (top layer, big particle diameter strengthening course, basic unit) according to the contrary analytical Calculation of multilayer elastic opinion, existing worker's method and the difference according to the reinforcing effect of worker's method of the present invention are confirmed with this.
Its result is shown in figure 21.
In addition, the present invention also comprises: regenerative agent adds step, when mixing is added with the old asphalt mixtures of first new material, adds the pitch regenerative agent; Interlayer bonding step (below be called " interlayer bonding step ") forms in the step at big particle diameter strengthening course, and scatter pitch emulsion or be used to improve the material of water proofing property and cementability to rest layers, thus bonding rest layers and big particle diameter strengthening course.In view of the above; Pitch to deterioration is regenerated; Even if or the damage or the crackle that surmount the boundary face between basic unit and the top layer can be controlled to Min. reciprocal influence through between rest layers and big particle diameter strengthening course, adhesives being set when reaching darker rest layers.In addition; Formed big particle diameter strengthening course and new top layer; Under the state of accumulation of heat, be compacted and be one; Thereby between big particle diameter strengthening course and new top layer, need not to be provided with adhesives, the bottom surface portions on new top layer can form with the engagement that contains aggregate with the surface portion of big particle diameter strengthening course, therefore according to stress longitudinally and the dislocation that incidental interlayer slip caused also is difficult for generation.
Figure 22 to Figure 29 shows summary and the result who utilizes the full scale test body (model of mating formation) of mating formation to be made an experiment, and to be used for the laying reinforcing effect of quantitative assessment according to big particle diameter strengthening course, promptly durability promotes effect.Figure 22 shows the paving structure of the full scale test body of mating formation, and this test body is applicable to the test of quantitative assessment according to the laying effect of big particle diameter strengthening course.The test system of mating formation makes the paving structure of the pitch laying that is applicable to the urban district.In Figure 22, the test body No.1～No.4 that mats formation has following structure.
No.1: standard laying structure
No.2: utilize the old top layer 3cm+ top 3cm of old basic unit to form the structure of big particle diameter strengthening course 8cm
No.3: roadbed thickness is reduced to 1/2 and reduced the structure of support force for the standard paving structure
No.4: the structure that the structure of No.3 is carried out reinforcement according to big particle diameter strengthening course 8cm
Carry out FWD (Falling Weight Deflect meter) test for these test bodies of respectively mating formation, thereby detect the displacement on surface of mating formation that occurs in the test body of respectively mating formation, and relatively lay reinforcing effect.The design condition of test body of mating formation is that traffic loading is that wheel load, the design traffic volume of 5t is that daily traffic volume reaches about 100～250, the roadbed support force is roadbed CBR=8.Figure 23 shows the quality test content of the test body of mating formation of made.
The laying reinforcing effect of testing body of mating formation can be estimated according to the fatigue failure number of times (fatigue failure is returned number or allowed the traveling number of times) of the test body of mating formation.The fatigue failure number of times of testing body of mating formation is meant on the road of mating formation, and applies certain wheel load repeatedly to the surface of mating formation, until the number of times that cracks at the body of mating formation.Shown in figure 24, the fatigue failure number of times, the value of utilizing wheel load with 5t being applied to the stretcher strain below the asphalt mixtures that is created in the test body of mating formation when mating formation the test body is calculated with the value that is created in the compressive strain above the roadbed.The paving structure that illustrates the existing body of mating formation of upper left side among Figure 24, the paving structure that illustrates the body of mating formation that contains big particle diameter strengthening course of upper right side.The mathematical expression of Figure 24 is the calculating formula that is used to calculate the fatigue failure number of times that American National flexible pavement association (NAPA) formulates.
Figure 25 shows the quality test result of the test body of mating formation, and Figure 26 shows according to (D under the weight whereabouts of FWD test 0) the surface displacement amount.This displacement is the bending that faces down and produced when recessed according to mat formation to pitch plate whereabouts weight and plate, and the value of the big more said displacement of support force of mating formation is more little.Shown in figure 25, No.2 mat formation the test body displacement at the mat formation test body of all its displacements of detection position less than other.In addition, can learn following content from Figure 26.
(1) for the difference on the paving structure of No.1 and No.2, the structure of No.2 is replaced into big particle diameter strengthening course with the part of the portion of basic unit of the structure of No.1.The displacement of No.2 is less than the displacement of No.1, when the support force of roadbed and roadbed is identical, improves according to big particle diameter strengthening course and to lay support force.
(2) No.3 and No.4 are the paving structures that respectively the roadbed thickness of No.1 and No.2 is changed to half.These test bodies of mating formation change for the support force that makes the body roadbed depths of mating formation on same roadbed and set.As the situation of above-mentioned (1), through big particle diameter strengthening course is set, make displacement diminish, improve and lay support force.
(3) for the support force that the minimizing according to roadbed thickness changes, when utilization was estimated according to the equivalent conversion thickness of Ta design method, if roadbed thickness reduces 10cm, then the support force characteristic descended about 20%.
Figure 27 shows and being utilized in construction mat formation test employed material and coefficient of elasticity of the asphalt mixtures that the test body made detects during body.The coefficient of elasticity of asphalt mixtures detects according to " modulus of elasticity of asphalt mixtures (resilient modulus) test method(s) " (laying the other volume of test method(s) brief guide).Test temperature is 25 ℃.Use as input value during fatigue failure number of times that pitch that this coefficient of elasticity is stated after calculating is laid.And according to the record of " the design and construction guides (Japanese road association) of mating formation ", the coefficient of elasticity of general asphalt mixtures is 600～12,000 (MPa).
Shown in figure 27, the coefficient of elasticity of coarseness asphalt mixtures or big particle diameter asphalt mixtures is greater than close granularity asphalt mixtures.This expression is when the aggregate floor increases, and it is big that the coefficient of elasticity of asphalt mixtures becomes.
Figure 28 shows the stretcher strain below each the asphalt mixtures layer that is created in the test body of mating formation that is calculated through the theoretical parsing of multilayer elastic and is created in the compressive strain above the roadbed.As the input value of calculation procedure, used the coefficient of elasticity (with reference to Figure 27) of the asphalt mixtures that detects according to elasticity modulus test and the bed thickness of the test body of respectively mating formation.
Upside figure from Figure 28 can learn following content.
(1) result from stretcher strain below the asphalt mixtures layer when big, expression asphalt mixtures layer is in the state that crackle destroys that is easy to generate.Relatively No.1 can know with No.2, and No.2 is through being provided with big particle diameter strengthening course, and it is about 1/2 that stretcher strain is reduced to, and compares No.1 and is in crackle and destroys the state that is difficult for generation.
(2) relatively No.2 can know with No.4, even if become half for the thickness of the roadbed thickness roadbed of the 20cm of No.2, but the size of stretcher strain is almost identical with No.2.Hence one can see that, even under the state (be estimated as and descend 20% approximately) how many support forces of roadbed depths has reduced, through the effect that big particle diameter strengthening course can obtain scatteredload is set, the repellence of destroying for the crackle of asphalt mixtures can rise.
In addition, can learn following content from figure below of Figure 28.
When (1) compressive strain above the roadbed was big, expression applied according to the wheel load, was easy to generate the distortion (rut seal depression) that compression causes at the body of mating formation.Through relatively No.1 and No.2 can know that No.2 becomes thick and heavy through big particle diameter strengthening course is set, the decrement minimizing that its result mats formation whole.
(2) for No.1 and No.4, the whole thickness No.1 that mats formation is slightly thicker.Though the roadbed thickness of No.4 is 10cm and less, is provided with big particle diameter strengthening course.The size of the compressive strain above the roadbed, it is slightly smaller that No.4 compares No.1, thereby can find out the effect that can suppress compressive strain that big particle diameter strengthening course is brought.
Figure 29 shows being recorded in mat formation the plan traffic volume of design and construction in the guide and the relation between the fatigue failure number of times, and value that will stretcher strain shown in Figure 28 and compressive strain is input in the calculating formula shown in Figure 24 respectively mating formation of acquisition and tests the fatigue failure number of times of body.And the fatigue failure number of times of Figure 29 has adopted N shown in Figure 24 FaAnd N FbIn less number of times.
Can learn following content from Figure 29.
(1) the fatigue failure number of times (about 950,000) that is provided with the No.2 of big particle diameter strengthening course reaches 6 of No.1 and accompanies abovely, can learn from its result, and the durability of when big particle diameter strengthening course is set, mating formation can rise.As a result, as far as No.2, the plan traffic volume is distinguished and is equaled the above paving structure of 1 grade.
(2) the fatigue failure number of times of No.3 is about 50,000 times, and No.4 is about 250,000 times, has increased about 5 times.Can learn from this result, even if under how many situation about descending of support force of mating formation in the attenuation of roadbed thickness, as long as big particle diameter strengthening course is set, the effect of the durability that then can improve.

Claims (17)

1. the asphalt mixtures layer of the road of will mating formation repaves the method for being located at the road surface continuously, and this method is accomplished through making self-propelled vehicle system voluntarily, it is characterized in that said method comprises:
(a) thermoplastic step, the surface of heating said asphalt mixtures layer, make the degree of depth of the boundary face between heat leak to basic unit that surmounts said asphalt mixtures layer and the top layer or be equivalent to this degree of depth said asphalt mixtures layer the degree of depth and soften;
(b) scarifying step, to surmount be heated and the degree of depth of the said boundary face of softening said asphalt mixtures or be equivalent to the degree of depth of said asphalt mixtures layer of this degree of depth till carry out scarifying and form old asphalt mixtures;
(c) first adds step; To said old asphalt mixtures through scarifying; Interpolation to be to be pre-stored in the aggregate of particle diameter in the device that prestores, big by the temperature of granuleization or to be attached with the aggregate of pitch, perhaps contains any first new material in the asphalt mixtures of size distribution of big diameter aggregate;
(d) blend step mixes the said old asphalt mixtures that is added with said first new material, and forms the reinforcement asphalt mixtures;
(e) big particle diameter strengthening course forms step, in said scarifying step by scarifying after on the rest layers of remaining said asphalt mixtures layer, the even said reinforcement asphalt mixtures in shop is to form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of said rest layers;
(f) second adds step, on formed said big particle diameter strengthening course, adds not to be pre-stored in asphalt mixtures in the device that prestores, that be used to form new top layer, i.e. second new material by the temperature of granuleization;
(g) new top layer forms step, and the shop is spared said second new material and formed new top layer, and this step forms step with described big particle diameter strengthening course and is associated;
(h) compacting step, under the accumulation of heat state, the one compacting is formed on said big particle diameter strengthening course and the said new top layer on the said rest layers.
2. method according to claim 1; It is characterized in that before said scarifying step, also comprising: new material is moved into step; With said first new material and said second new material that be transported into outside the said self-propelled vehicle system different opportunitys, move into respectively in the device that prestores on said different opportunitys.
3. method according to claim 1 and 2, it is characterized in that said first new material be the aggregate of comparing the maximum particle diameter that is included in said asphalt mixtures layer have the aggregate of bigger particle diameter or be attached with pitch aggregate, or contain in the asphalt mixtures of size distribution of the bigger aggregate of the aggregate particle diameter of comparing the maximum particle diameter that is included in said asphalt mixtures layer any one.
4. method according to claim 1 and 2; It is characterized in that being added with the said reinforcement asphalt mixtures of said first new material; Include the aggregate that the aggregate of comparing the maximum particle diameter that is included in said asphalt mixtures layer has bigger particle diameter, its content is for comprise 5%～35% from said reinforcement asphalt mixtures on the whole.
5. method according to claim 1 and 2 is characterized in that said blend step also comprises: regenerative agent adds step, when the said old asphalt mixtures that is added with said first new material is mixed, adds the pitch regenerative agent.
6. method according to claim 1 and 2 is characterized in that said second new material contains the aggregate of the size distribution identical with the size distribution that aggregate had that is included in said asphalt mixtures layer.
7. method according to claim 1 and 2; It is characterized in that said big particle diameter strengthening course forms step and also comprises: the interlayer bonding step; Scatter pitch emulsion or be used to improve the material of water proofing property and cementability to said rest layers, thus bonding said rest layers and said big particle diameter strengthening course.
8. self-propelled vehicle system is used for asphalt mixtures layer with the road of mating formation and repaves continuously and be located at the road surface, it is characterized in that comprising:
Preheating vehicle (A); This preheating vehicle (A) comprises heater; The mat formation surface of said asphalt mixtures layer of road of this heater heating, make the boundary face between heat leak to basic unit that surmounts said asphalt mixtures layer and the top layer the degree of depth or be equivalent to this degree of depth said asphalt mixtures layer the degree of depth and soften;
Milling vehicle (B), this milling vehicle (B) comprises: first tank, with big diameter aggregate or be attached with the aggregate of pitch, perhaps contain any first new material in the asphalt mixtures of size distribution of big diameter aggregate, not stored by the temperature of granuleization; The scarifying device, until surmount be heated and the degree of depth of the said boundary face of softening said asphalt mixtures layer or be equivalent to the degree of depth of asphalt mixtures layer of this degree of depth till carry out scarifying, thereby make it to become old asphalt mixtures; First adding set, with discharge from said first tank, add said old asphalt mixtures to said first new material of not stored by the temperature of granuleization;
Stir vehicle (C), this stirrings vehicle (C) comprising: second tank is second new material with the asphalt mixtures that is not used to form new top layer by the temperature pre-stored of granuleization; Mixing arrangement receives and mixes the said old asphalt mixtures that is added with said first new material, to form the reinforcement asphalt mixtures; First ironing machine, on the rest layers of remaining said asphalt mixtures layer, the even said reinforcement asphalt mixtures in shop is to form the big particle diameter strengthening course of coefficient of elasticity greater than the coefficient of elasticity of said rest layers after by the scarifying of said scarifying device; Second adding set, on formed said big particle diameter strengthening course, add discharge from said second tank, with not by said second new material of the temperature pre-stored of granuleization; Second ironing machine that is associated with first ironing machine is used to spread even said second new material that adds, to form new top layer.
9. self-propelled vehicle system according to claim 8 is characterized in that also comprising Roller compaction device (D), with the state one compacting of accumulation of heat be formed on the said rest layers said big particle diameter strengthening course be formed on the said new top layer on this big particle diameter strengthening course.
10. according to Claim 8 or 9 described self-propelled vehicle systems; It is characterized in that said milling vehicle (B) also comprises: discharger is gone in a centre, receives and discharge said first new material and said second new material that are transported into outside the said self-propelled vehicle system on different opportunitys; The new material that comprises at least two continuous transport paths is moved into device; Has switching device shifter on the said transport path, to be used for moving into said first new material and said second new material of being gone into the discharger discharge from said centre to said first tank and said second tank respectively on said different opportunitys; Wherein, When being gone into said first new material from said centre discharger when moving into said first tank; Continuous two transport paths that said switching device shifter makes said new material move into device cut off and form and move into mouth; By the formed said mouth of moving into said first new material is moved into said first tank; And when being gone into said second new material from said centre discharger when moving into said second tank; Said switching device shifter cuts out and is formed on the said mouth of moving into that said new material is moved into device, thereby connects said two transport paths and form a transport path, makes said second new material gone into discharger from said centre thus and moves into said second tank via a said transport path.
11. according to Claim 8 or 9 described self-propelled vehicle systems, it is characterized in that said first new material be the aggregate of comparing the maximum particle diameter that is included in said asphalt mixtures layer have the aggregate of bigger particle diameter or be attached with pitch aggregate, or contain in the asphalt mixtures of size distribution of the bigger aggregate of the aggregate particle diameter of comparing the maximum particle diameter that is included in said asphalt mixtures layer any one.
12. according to Claim 8 or 9 described self-propelled vehicle systems; It is characterized in that being added with the said reinforcement asphalt mixtures of said first new material; Include the aggregate that the aggregate of comparing the maximum particle diameter that is included in said asphalt mixtures layer has bigger particle diameter, its content is for comprise 5%～35% from said reinforcement asphalt mixtures on the whole.
13. according to Claim 8 or 9 described self-propelled vehicle systems, it is characterized in that said second new material contains the aggregate of the size distribution identical with the size distribution that aggregate had that is included in said asphalt mixtures layer.
14. according to Claim 8 or 9 described self-propelled vehicle systems, it is characterized in that said stirring vehicle (C) also comprises the regenerative agent adding set, to be used for when being added said first new material by the said old asphalt mixtures of scarifying, adding the pitch regenerative agent.
15. according to Claim 8 or 9 described self-propelled vehicle systems; It is characterized in that said stirring vehicle (C) also comprises the 3rd tank, to be used for the material that pre-stored is used for the pitch emulsion of bonding said rest layers and said big particle diameter strengthening course or is used to improve water proofing property and cementability.
16. according to Claim 8 or 9 described self-propelled vehicle systems; It is characterized in that said stirring vehicle (C) also comprises first memory space that is formed between said mixing arrangement and said first ironing machine, to be used to regulate the quantity delivered of the said reinforcement asphalt mixtures that is provided to said rest layers.
17. according to Claim 8 or 9 described self-propelled vehicle systems; It is characterized in that said stirring vehicle (C) also comprises second memory space that is formed between said first ironing machine and said second ironing machine, to be used to regulate the quantity delivered of said second new material that is provided to said big particle diameter strengthening course.
CN2008801157756A 2007-11-12 2008-11-12 Method of continuously repaving asphalt mixture layer of paved road in-situ and self-propelled vehicle system therefor Expired - Fee Related CN101855404B (en)

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