CN109750587A - A kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine - Google Patents
A kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine Download PDFInfo
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- CN109750587A CN109750587A CN201910042587.5A CN201910042587A CN109750587A CN 109750587 A CN109750587 A CN 109750587A CN 201910042587 A CN201910042587 A CN 201910042587A CN 109750587 A CN109750587 A CN 109750587A
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Abstract
The invention patent discloses a kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine.Slice by slice cutting recycling machine is made of motor-vehicle bodies, cutter, angular adjustment system, control system.The function that motor-vehicle bodies realize walking, carry cutter, operation control system, cutter and rotating arm angular adjustment system, control system realize the blocky cutting longitudinally, laterally, vertically of asphalt concrete pavement, and cutter and its angular adjustment system, control system realize the horizontal resection recycling of massive asphalt concrete topping.The multi-angle that this Slice by slice cutting recycling machine not only can adjust vertical direction to the horizontal direction of cutter is cut, and it can be by adjusting the angle of rotating arm, realize the multi-faceted cutting from vehicle body left side to right side, it is easy to operate flexible, it is also convenient for the road surface cutting of certain non-Founders.In addition, the effective use of old asphalt concrete material can be improved in Slice by slice cutting recycling machine, and there is no noise, dust, vibration, former road surface is not damaged, not will cause secondary pollution.
Description
Technical field
The invention patent relates to a kind of multi-faceted asphalt concrete pavement Slice by slice cutting equipment, this equipment is able to achieve pitch
The multidirectional Slice by slice cutting in concrete road surface, to make full use of the RAP material of recycling to prepare high performance regeneration asphalt coagulation
Soil.
Background technique
At year ends 2013, statistics display Chinese cement concrete road surface is mainly used for township, in village's low-grade highway, 10.4 ten thousand
In km express highway pavement, cement concrete pavement only has 3452.8km, proportion only 0.19%, asphalt concrete pavement institute
Accounting example is 99.81%, and cement concrete pavement is compared with the mileage quantity of asphalt concrete pavement, almost negligible to disregard.By
In asphalt concrete pavement is convenient with working drawing review with respect to other road surfaces such as cement concrete pavements, road-ability is good, prolongs
Long Life of Tyre saves the advantages such as fuel oil, quick open to traffic, public to year ends 2017 national total mileage of highway 477.35 ten thousand
In middle level Four and ratings above highway mileage up to 433.86 ten thousand kilometers, account for total mileage of highway 90.9%, nearly all use pitch coagulation
Soil surface, the update of original cement, sand-gravel surface, which overlays, also gradually uses Asphalt Concrete Overlay.Urban road is also in this way, mesh
Preceding nearly all urban road all uses asphalt concrete pavement.However, the design service life of asphalt concrete pavement is shorter,
8 ~ 15 years, with the continuous development of logistics, the ratio of Heavy Traffic was increasing, and traffic volume growth rate is higher and higher, pitch
Concrete road surface early damage is also increasingly severe, and actual use just needs maintenance and renovation for 7 ~ 8 years, and some even runs 2 ~ 3 years just
Start the destruction such as crack, pit slot occur.The highway built up successively after the nineties entered it is big or middle repair the phase, hereafter, often
Year there are about 12% bituminous pavement needs to overhaul, and Bituminous concrete surface discarding amount is up to annual 2200000 tons, and this number be with
What annual about 15% speed increased, after 10 years, the big or middle old asphalt mixture for repairing generation of bituminous pavement is up to thousands of
Ten thousand tons.It digs, the asphalt bulk deposition of milling is in both sides of the road and other fixed venues, or useless as garbage loading embeading
It abandons, not only pollutes environment in this way, but also waste valuable resource.One side pitch is the heavier hard-degraded substance of smell, will be caused
Surrounding enviroment seriously pollute；On the other hand new building stones are largely exploited, will lead to forest cover reduction, soil erosion etc. is serious broken
Bad ecological environment, and the significant wastage of resource is caused, as many as 1,500,000,000 yuan of fee of material can be saved every year if through regeneration.Cause
This, the exploitation of research, the popularization and relative special-purpose equipment of asphalt concrete regenerating technology, to reducing the construction costs, protecting ecology
Environment and the resource-conserving to our countries, environmentally friendly amphitypy society and sustainable development highway construction have pole
Big meaning.
Applied of Asphalt Pavement Recycle Technique is comparative maturity in the application of developed country and popularizes.The U.S. is that earliest research uses
The country of asphalt pavement regeneration and reutilization technology, so far from 1976, road surface waste regeneration utilization rate is more than 70%.West Europe
Country also attaches great importance to this technology, the waste asphalt pavement material regeneration rate of European Asphalt road surface association (EAPA) each member state
Reach 100%.The collection and storage work of old pavement material are all organized in the almost all of cities and towns of Finland, and the world is through being combined within 1997
It knits and detailed investigation has been carried out to 14 national ground surface material regeneration situations, delivered " road engineering regeneration war
Slightly " white paper points out that the regeneration rate of old bitumen pavement material is 75% ~ 100% in book.Again according to international clean energy resource and environmental protection
Raw administration's statistics, American-European bituminous pavement recycling have reached 80% or more, and Holland, Spain have had reached 100%.According to another report,
External bituminous pavement can be accomplished repeatedly to recycle.
For China's bituminous pavement recycling and reusing rate there are also larger gap compared with American-European countries, pitch regeneration in China's is big at present
Sizable application is also in the starting stage, in " Recycling Old Asphalt Mixture using " project research that the nineteen eighty-three Ministry of Construction assigns,
Light oil appropriate is added in old residual-oil pavement to soften it, mixing and stirring for mixture is carried out using the conventional equipment suitably reequiped, and
In Suzhou, Wuhan, Tianjin, four, Nanjing city making, more than 30,000 square metres of Experiment Road, regenerated road surface is proved through observation
It is comprehensive to be not less than conventional Hot-mix Bituminous Concrete Pavement using quality.And since the late 1980s, along with China
The Large scale construction of high-grade highway, new highway road surface almost no longer consider that, using waste and old ground surface material, pitch regeneration is withdrawn to
Backseat, correlative study popularization are substantially at dead state.Until in recent years, with growth, the budget of national road demand
The reduction of fund, and to the needs of safe and efficient and cost-effective roadnet, the demand that existing road repairs
It increases substantially.National Environmental Protection Agency and expert also appeal that " waste asphalt pavement material is containing the noxious materials such as sweet smell, naphthalene, degradation speed
Slowly, contaminated soil and water source；These obsolete material main components are pitch and basalt, are all non-renewable resources, not good
Good utilisation is sorry blue mountains and green waters ".As bituminous pavement reconstruction, the feature of environmental protection repaired, economy technology-asphalt road plane materiel
In the work schedule of the material regenerative use technology person that refers to highway work again, become the hot issue of highway scientific research.One
A little scientific research institutions and colleges and universities start to carry out the research and extension of hot in-place recycling.For example, 1998, Department of Communications, Handan City introduces
Witt, Germany root company WR2500 regenerating device is changed using one section highway of the situ regeneration technology to Hebei Province for the first time
Make maintenance.2003, introduce in wide Buddhist express highway pavement overhaul U.S. ASTEC company twin-roll pitch regeneration stirring apparatus into
The regeneration of row bituminous pavement, this is the highway projects of the first large-scale application plant-mix heat recycle technology in China, mesh
Preceding behaviour in service is good.But compared with developed countries, the asphalt surface hot reproduction technology in China not yet forms complete material
Appraisement system, mixing proportion design method, construction technology, again generating apparatus and quality control standard, therefore still need to for relevant issues exhibition
Open further further investigation.It is domestic at present to the research of hot in-plant reclaimed old material be concentrated mainly on to old material moisture content, gradation,
The research of bitumen content, the performance for recycling pitch etc., few pairs of former ground surface materials carry out layering recycling and layering research
And obtain the work of valuable conclusion.Chang An University Deng Xiaoqing in its paper by route hierarch milling sample, for
Each layer sample carries out bitumen recovery respectively and has carried out the test of index of correlation, obtains bituminous pavement with its different aging of depth
Degree has significant difference, and surface layer aging is more serious, and with the increase of depth, aging will be more slowly.Xu Ke " is returned in his paper
The Zhejiang Province's Hangzhoupro Shen Jiahu highway is had chosen in influence of debit's formula to recycling material of waste asphalt variability " and Hangzhou-Zhejiang high speed is public
The recycling material of waste asphalt acquired when the heavy resurfacing of two highways with typical representative in road is studied, broken material
Milling material when 1-6mm acquisition is from the Hangzhoupro Shen Jiahu highway heavy resurfacing in 2012, milling not divided lane, regardless of structure sheaf；
Milling material 1-6mm is the milling material in Hong Yong Freeway upper layer (3 lane), is the RAP for being layered milling.It is dripped from two kinds of RAP
The testing result of green content obtains, and two groups of RAP Asphalt Contents are significantly different, wherein Hong Yong Freeway upper layer RAP milling
Bitumen content in material is higher more stable, and average content reaches 4.74%, the coefficient of variation 3.1869%, and the Hangzhoupro Shen Jiahu high speed is public
The RAP Asphalt Content average value on road is 3.96%, and the coefficient of variation has reached 5.5% or so, and bitumen content variability is larger, says
Bright layering milling can effectively improve the variability of RAP Asphalt Content；From the bitumen aggregate ratio curve of asphalt reclamation material it can also be seen that
The bitumen aggregate ratio of reclaimed materials without layered shaping will be significantly lower than the bitumen aggregate ratio of the reclaimed materials of layered shaping.As it can be seen that different structure
Bitumen content in the RAP of layer is widely different, so that the performance that will lead to RAP morphs, carries out to same highway
It is layered milling, also has certain help to the uniformity aspect for improving bitumen content.The testing result for performance of gathering materials in RAP is also such as
This, the RAP of Hong Yong Freeway gather materials each test group the discreteness for being sieved through rate it is smaller, and the Shen of not layered milling is good
The discreteness of the rate that is sieved through of gathering materials of the RAP of lake Hangzhoupro highway is obvious, thus illustrates to be layered what milling gathered materials to RAP
Gradation influence is also related, and layering milling can keep the gradation grade on former road surface substantially, does not make gradation that big variation occur.Therefore,
Way of recycling is very crucial to the effective use of reclaimed asphalt mixture.
The equipment of the old asphalt mixture of China's recycling at present is mainly milling machine.Milling machine is Asphalt Concrete Pavement Maintenance
One of capital equipment of construction is mainly used for the excavation renovation of the asphalt concrete pavements such as highway, town road, airport, goods yard,
It can be used for removing the defects of packet, oily wave, reticulate pattern, track are gathered around in road surface, may further be used to excavated pavement pit slot and groove, Yi Jishui
The milling of the plucking and surface layer faulting of slab ends in road face is flat.General milling machine adjusts dress by engine, vehicle frame, Milling Rotor, milling depth
It sets, the composition such as Hydraulic Elements, accumulator conveyer, steering system and braking system.Milling Rotor is the main working parts of milling machine,
It is made of Milling Rotor axis, tool apron and cutter head etc., directly contacts with road surface, is worked by its high-speed rotating milling cutter
Achieve the purpose that milling.Patent No. CN201710806599.1 discloses a kind of milling machine of adjustable milling depth, by milling
Rack, milling rotor, engine, milling depth control apparatus, milling depth adjustment, movable motor, preceding scroll wheel, rear rolling
Driving wheel, tail-gate, recycling belt dressing, connecting rod and oil cylinder composition, are filled by milling depth control apparatus and milling depth adjustment
It sets, can accurately be adjusted with the milling depth of road pavement, reach the ideal effect of milling.
Municipal administration, the ideal equipment of Highway Maintenance center punishment pavement crack are cutting machines, it can also be used to bituminous pavement
Widen cutting, new and old overlap joint, old road repairing cutting.Patent No. CN201521068918.6 discloses a kind of bituminous pavement cutting
Machine is made of rack, motor, water tank and battery, front and back supporting leg etc., be successively fixed with from left to right on the rack water tank,
Motor and battery, set cutting wheel below motor；The lower surface of rack is also fixedly installed with blower, and the lower end of blower is set
There is air outlet.Front support leg includes shaft seat, shaft and cylinder, is equipped with idler wheel, rear support leg in the piston-rod lower end of cylinder
Include fixes sleeve, adjust bolt and telescopic rod, idler wheel is also installed in the lower end of telescopic rod.This utility model mainly solves
Two problems: cutting machine height-adjustable, it is time saving and energy saving；The dust impurity for cutting road surface can be blown away, it is prior not need worker
It is cleaned, improves treatment effeciency.
Milling machine pulverizes old asphalt mixture layer by Milling Rotor, causes damage to asphalt composition material
Wound, gathers materials and is refined；Patent No. CN201710806599.1, although being filled by milling depth control apparatus and milling depth adjustment
It sets, can be adjusted with the milling depth of road pavement, but Milling Rotor is by high-speed rotation cataclasitlc structure layer, so pitch
Concrete road surface upper, middle and lower surface layer cannot be layered well, in addition, milling depth adjustment is subsection setup, Bu Nengshi
It is incumbent meaning depth adjusting, Milling Rotor milling depth is also limited, to cutting optimal cannot a milling in place.And cutting machine is main
For section cutting and joint-cutting, do not consider that asphalt recycles generally.The invention patent combines the characteristics of both equipment, mentions
A kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine is gone out.
Summary of the invention
The invention patent is to propose a kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine.
The purpose of the invention patent is realized in the following way: multi-faceted asphalt concrete pavement Slice by slice cutting recycling
Machine is made of motor-vehicle bodies, cutter, angular adjustment system, control system.Drive energy, circuit control are mounted on motor-vehicle bodies
Making sheet, load driver equipment, radar range finding route, motor-vehicle bodies realize walking, the various components of carrying cutter, control operation system
The function of system can adjust heating temperature, load dynamics and joint-cutting depth when cutting in real time.The rotating arm of connection cutter can be stretched
Contracting, can reach the position for needing joint-cutting by the length of Telescopic rotating arm, and when off working state can also will be cut by telescopic rod
Cutter is collapsed onto body；Rotating arm can realize cutter from vehicle body left side to front end again to the car body right side by angular adjustment system
It is adjusted at any angle within the scope of the 180 degree of side.Cutter are rectangular enclosure structure, and bottom end and front and back end are thin-walled blade,
Multilayer heating tube is arranged in bottom end, and side is arranged heat detector, can be selected according to the asphalt pavement structural layer position of cutting by control system
The radical of temperature and heating tube.Cutter also can adjust working condition by its angular adjustment system, when cutting longitudinal joint and transverse joint
It is set as plumbness, horizontal resection is set as horizontality when recycling.There are circuit control panel and display screen on car body, it can on display screen
Temperature, depth, dynamics when display and adjusting cutting, can also show and adjust the angle orientation and angle state of cutter.It cuts
It heats soft pitch concrete by control system when cutter is placed in two sides and plumbness and applies power and work along both lines promotion
Blade is cut forward, and the depth of cutting is determined by radar range finding, realize asphalt concrete pavement longitudinally, laterally, vertically
Blocky cutting；Soft pitch concrete is heated by control system when cutter are placed in front end and horizontality and applies power pair
It pushes blade to cut horizontally forward under Guan Qi, realizes the Slice by slice cutting recycling of massive asphalt concrete topping.
The present invention have it is following the utility model has the advantages that
1) the operating position direction of cutter is adjustable, can both cut in lane one by one, also cleavable irregular place；
2) state direction of cutter is adjustable, both can vertical joint-cutting, can also horizontal resection；
3) only a piece of cutter, structure is simple, flexible operation；
4) the regeneration application of asphalt concrete material hierarchical classification is realized；
5) discarded Bituminous concrete surface material is reduced to pollute the environment；
6) effective use of old asphalt concrete material is improved；
7) the characteristics of meeting hot mastication using bituminous concrete can not only save oil consumption by heating cutter, but can accelerate to construct into
Degree；
8) depth of cut, temperature, dynamics all visualize, convenient for adjusting in time；
9) there is no noise, dust, not will cause secondary pollution；
10) it does not vibrate, be crushed, former road surface is not damaged.
Detailed description of the invention
The invention patent is further illustrated with reference to the accompanying drawings and examples
Fig. 1 is the top view of the multi-faceted Slice by slice cutting recycling machine vertical direction any angle working condition of the invention patent；
Fig. 2 is the top view of longitudinal joint-cutting working condition on the right side of the multi-faceted Slice by slice cutting recycling machine vertical direction of the invention patent；
Fig. 3 is the top view of longitudinal joint-cutting working condition on the left of the multi-faceted Slice by slice cutting recycling machine vertical direction of the invention patent；
Fig. 4 is the top view of the multi-faceted Slice by slice cutting recycling machine vertical direction transverse direction joint-cutting working condition of the invention patent；
Fig. 5 is the top view of the multi-faceted Slice by slice cutting recycling machine horizontal direction Slice by slice cutting working condition of the invention patent；
Fig. 6 is the elevation of the multi-faceted Slice by slice cutting recycling machine cutter of the invention patent；
Fig. 7 is the sectional view of the multi-faceted Slice by slice cutting knife of the invention patent；
Fig. 8 is the elevation of the multi-faceted Slice by slice cutting recycling machine radar range finding of the invention patent；
Fig. 9 is the plan view of the multi-faceted Slice by slice cutting recycling machine operating display of the invention patent.
1- car body in figure；2- cutter；21- counteredge；22- front cutting edge；23- rear knife edge；24- heating tube；25- warming
Device；26- radar range finding；261- loose-leaf；262- removable cover；263- knob；264- radar；265- notch；The rotation of 27- cutter
Axis；3- rotating arm；4- pedestal；5- liquid crystal display；51- cutter depth shows key；52- cutter temperature display key；53- is cut
Cutter dynamics shows key；54- rotating arm angular adjustment shows key；55- cutter angular adjustment shows key；56- heating tube power supply
Switch；57- total power switch；58- working condition display lamp.
Specific embodiment
As shown in Figure 1, the shape of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine is just like a bull-dozer, cutting
The circuit control system of knife, load driver system, operation control system are all disposed in motor-vehicle bodies and rotating arm, cutter
Width can be set as 2 meters, can be adjusted to vertical configuration and horizontal by rotary shaft and angular adjustment system, also can be adjusted to from vertical
Any angle within the scope of horizontal 90 degree meets the needs of different direction cutting, as shown in Figure 1, shown in Figure 5.The arm of rotating arm
Long and angle is all adjustable, and brachium can be collapsed when on the one hand not working convenient for cutter and be placed in by telescopic rod adjustable length
On body, it is on the other hand also convenient for the multi-directional rotation of rotating arm, reaches the position for needing joint-cutting；Cutter pass through rotating arm
Angular adjustment system, cutter can be placed on to left side of machine body, front end, right side also can be adjusted to as shown in Figure 2, Figure 3, Figure 4
Any position from left side to right side, as shown in Figure 1, realizing multi-faceted vertical joint-cutting.When start-up operation, pass through rotating arm handle
Cutter are placed on vehicle body side, and cutter are adjusted to vertical state, and the work of radar is pulled open by knob 263 and loose-leaf 261
Dynamic cover board 262, produces radar 264 from notch 265 towards road surface, opens total power switch 57, work by liquid crystal display 5
Make 58 bright light of state display lamp, heating tube power switch 56 has the independent switch of each heating tube, according to the bituminous pavement knot of cutting
The radical of structure layer position selection heating heating tube, upper, middle and lower surface layer is set by the design scheme of current bituminous pavement is respectively
4cm, 6cm, 8cm, then upper layer need to only open the switch of a heating tube, if it is opening for openable two heating tubes of middle surface layer
It closes, if it is the switch of cutting optimal then openable three heating tubes.Then the heating key for pressing cutter temperature display key 52, due to
The temperature sensitivity of asphalt is larger, when using different pitch, such as the construction of asphalt, modified pitch, coal tar pitch
Temperature is different, is equally asphalt, and different asphalt labels is also different, and modified pitch, coal tar pitch are also in this way, different types
Number construction temperature is different, and former Pavement Design file should be inquired before specific implementation, corresponding heating temperature is primarily determined, to temperature
Stop heating when being heated to close to surface layer construction temperature.It starts car to walk forward, then presses cutter dynamics and show key 53, lead to
Overdrive system gradually loads at the top of cutter, and pitch coagulation is realized under the collective effect of cutter side tool sword and counteredge
The vertical cutting of soil, radar can measure cutter top surface at a distance from road surface in real time, first measure blade and just contacted the initial of road surface
Distance, as blade slowly cuts road surface, this distance just slowly increases, when increasing to the sum of initial distance and Laminate construction thickness just
Can stop exerting a force, to obtain the penetraction depth of blade indirectly, radar range finding show key 51 can real-time display incision depth, such as
Fruit incision can adjust respectively temperature and dynamics or both while adjust when being hampered, but it is noted that temperature cannot be too high, cannot allow pitch
Concrete Cheng Liuzhuan.All longitudinal joints are so cut, then cutter tune is turn 90 degrees by rotating arm and is placed on front end, by just
Transverse joint is cut in the length of transport cutting asphalt concrete pavement piece, in this way, the bituminous concrete surface of the thumbnail formula of subregion in length and breadth
Layer is formed, and cutter are then changed into level by system for regulating angle, and thunder will be housed by knob 263 and loose-leaf 261
The removable cover 262 reached is embedded in notch 265, and radar is hidden in the cavity of cutter, adjusts cutter temperature display key 52
And cutter dynamics shows key 53, car reaches working face region, by the T-joining width, length, depth that segment it is longitudinal to
It is preceding successively to cut, after the completion of upper layer all cutting recycling, the operation of front is repeated, T-joining surface layer in is first cut and is cut into just
In the bulk of transport, then horizontal resection is recycled one by one, and cutting optimal is further continued for after the completion of middle surface layer.
Claims (5)
1. a kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine, it is characterised in that: Slice by slice cutting recycling machine is by motor-driven
Car body, cutter, angular adjustment system, control system composition, motor-vehicle bodies realize walking, carrying cutter, operation control system
The function of system, cutter and rotating arm angular adjustment system, control system realize asphalt concrete pavement longitudinally, laterally, it is perpendicular
To blocky cutting, cutter and its angular adjustment system, control system realize the horizontal resection of massive asphalt concrete topping
Recycling.
2. multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine according to claim 1, it is characterised in that: motor vehicle
Drive energy, circuit control panel, load driver equipment, radar range finding route are mounted on body, adding when can adjust cutting in real time
Hot temperature, load dynamics and joint-cutting depth.
3. multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine according to claim 1, it is characterised in that: connection is cut
The rotating arm of cutter is scalable, and can realize the 180 degree range from vehicle body left side to right side by rotating arm angular adjustment system
Inside adjust at any angle；Tune of the cutter from vertical state to horizontality can be realized by cutter angular adjustment system
It is whole.
4. multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine according to claim 1, it is characterised in that: cutter
For rectangular enclosure structure, bottom end and front and back end are thin-walled blade, and multilayer heating tube is arranged in bottom end, and heat detector is arranged in side, can
The radical of temperature and heating tube is selected by control system according to the Structural Materials for Asphaltic Pavement of cutting and layer position.
5. multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine according to claim 1, it is characterised in that: setting exists
Radar on cutter be it is movable, when vertical joint-cutting, which pulls open removable cover, makes radar towards road surface, and when horizontal resection closes work
Dynamic cover board is hidden in radar in the cavity of cutter.
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| CN201910042587.5A CN109750587A (en) | 2019-01-17 | 2019-01-17 | A kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine |
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| CN201910042587.5A CN109750587A (en) | 2019-01-17 | 2019-01-17 | A kind of multi-faceted asphalt concrete pavement Slice by slice cutting recycling machine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110658334A (en) * | 2019-09-17 | 2020-01-07 | 安徽省公路工程建设监理有限责任公司 | Road evaluation detection system based on BIM technology |
| CN112323601A (en) * | 2020-11-02 | 2021-02-05 | 湘潭大学 | Machine is retrieved in cutting of adjustable width asphalt concrete road surface layering |
| CN113882227A (en) * | 2021-10-12 | 2022-01-04 | 刘丹 | Old and useless pitch removing devices is used in highway construction |
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| CN113882227B (en) * | 2021-10-12 | 2022-11-11 | 刘丹 | Old and useless pitch removing devices is used in highway construction |
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Application publication date: 20190514 |