CN113832807A - Cement stabilized macadam processing method - Google Patents
Cement stabilized macadam processing method Download PDFInfo
- Publication number
- CN113832807A CN113832807A CN202111315541.XA CN202111315541A CN113832807A CN 113832807 A CN113832807 A CN 113832807A CN 202111315541 A CN202111315541 A CN 202111315541A CN 113832807 A CN113832807 A CN 113832807A
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- China
- Prior art keywords
- stabilized macadam
- cement stabilized
- mixture
- cement
- vibrating
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- 239000004568 cement Substances 0.000 title claims abstract description 98
- 238000003672 processing method Methods 0.000 title claims description 6
- 239000000203 mixture Substances 0.000 claims abstract description 58
- 238000002156 mixing Methods 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 29
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 32
- 230000005540 biological transmission Effects 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 11
- 238000000576 coating method Methods 0.000 claims description 11
- 239000011241 protective layer Substances 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 description 7
- 239000010426 asphalt Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/02—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for preparing the materials
- E01C19/10—Apparatus or plants for premixing or precoating aggregate or fillers with non-hydraulic binders, e.g. with bitumen, with resins, i.e. producing mixtures or coating aggregates otherwise than by penetrating or surface dressing; Apparatus for premixing non-hydraulic mixtures prior to placing or for reconditioning salvaged non-hydraulic compositions
- E01C19/1013—Plant characterised by the mode of operation or the construction of the mixing apparatus; Mixing apparatus
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
- E01C19/4833—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with tamping or vibrating means for consolidating or finishing, e.g. immersed vibrators, with or without non-vibratory or non-percussive pressing or smoothing means
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a method for processing cement stabilized macadam, which comprises the following steps: s1, calculating the mixing proportion of the cement stabilized macadam mixture, and stirring and mixing the cement stabilized macadam mixture; s2, paving a cement stabilized macadam mixed material layer on the roadbed, wherein in the paving process, a vibrating piece vibrates the cement stabilized macadam mixed material and moves along with the paving position of the cement stabilized macadam mixed material; s3, after the cement stabilized macadam mixture is vibrated by the vibrating piece, rolling the cement stabilized macadam mixture layer immediately. The invention has the advantages that the vibrating piece carries out vibration operation on the cement stabilized macadam mixture just falling on the roadbed, so that the cement stabilized macadam mixture on the roadbed is uniformly paved, the materials between the macadam frameworks are filled more fully, the cement stabilized macadam mixture layer is compact after rolling, and the cement stabilized macadam mixture layer can not generate crack phenomenon.
Description
Technical Field
The invention relates to the technical field of municipal construction, in particular to a method for processing cement stabilized macadam.
Background
At present, most of roads and urban roads built in China are of an inorganic binder base layer plus asphalt binder surface layer structure, wherein most of the inorganic binder base layer is cement-stabilized macadam. The cement stabilized macadam consists of aggregate, graded macadam, and a mortar volume comprising water and cementitious material consisting of cement and mix. The construction method of the cement stabilized macadam comprises the following steps: mixing all the materials together in proportion by using an ash-soil mixer at a mixing station, uniformly stirring, transporting to a construction site, paving by using a paver, then rolling and forming, and finally curing to obtain the cement stabilized macadam foundation. The principle of forming the strength of the cement stabilized macadam pavement base is as follows: graded broken stones are used as aggregates, a certain amount of cementing materials and enough mortar volume are adopted to fill gaps of the aggregates, paving and compacting are carried out according to the embedding and extruding principle, the strength is mainly formed by embedding, extruding and locking actions among the broken stones, the structural strength of the broken stones forming a framework is required to be high, and the plate body property is good.
At present, when the cement stabilized macadam processing method is used, gaps of a macadam framework are difficult to fill up, so that fillers cannot be compacted, cracks of a cement stabilized macadam base layer are more easily caused, the cracks can affect an asphalt roadbed, the asphalt roadbed is cracked, and the service life of a road is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for processing cement stabilized macadam.
The invention solves the technical problems through the following technical means:
a method for processing cement stabilized macadam comprises the following steps:
s1, calculating the mixing proportion of the cement stabilized macadam mixture, and stirring and mixing the cement stabilized macadam mixture;
s2, paving a cement stabilized macadam mixed material layer on the roadbed, wherein in the paving process, a vibrating piece vibrates the cement stabilized macadam mixed material and moves along with the paving position of the cement stabilized macadam mixed material;
s3, after the cement stabilized macadam mixture is vibrated by the vibrating piece, rolling the cement stabilized macadam mixture layer;
and S4, curing the cement stabilized macadam mixed material layer until the strength of the cement stabilized macadam mixed material layer is not less than 3.5 MPa.
Preferably, the vibrating piece is arranged inside the cement stabilized macadam mixed material layer, and the vibrating piece vibrates to drive the cement stabilized macadam mixed material layer which is just laid to vibrate.
Preferably, the vibrating part includes vibrating motor, transmission shaft and inoxidizing coating, vibrating motor sets up and is close to bottom position department at mixing stirring storehouse lateral wall, the last transmission connection of vibrating motor has the transmission shaft, the parcel has the inoxidizing coating on the transmission shaft, the inoxidizing coating vibration drives the cement and stabilizes the rubble mixture layer and vibrate.
Preferably, the vibrating pieces are arranged side by side, and a connecting rope is fixed between every two vibrating pieces.
Preferably, the cement stabilized macadam mixture is stored in the mixing and stirring bin, a plurality of movable wheels are uniformly arranged at the bottom of the mixing and stirring bin, the side wall of the mixing and stirring bin is located on one side of the vibrating piece and communicated with a discharge channel, and the discharge channel conveys the cement stabilized macadam mixture in the mixing and stirring bin.
Preferably, the discharge passage conveys the cement-stabilized macadam mixture to a roadbed, and the vibrating member vibrates the cement-stabilized macadam mixture which just falls down.
Preferably, the bottom of the mixing and stirring bin is provided with a limiting piece for limiting the position of the protective layer.
Preferably, the locating part comprises a limiting sleeve and a fixing rod, the limiting sleeve is sleeved on the protective layer, one end of the fixing rod is connected to the limiting sleeve, and the other end of the fixing rod is fixed to the bottom of the mixing and stirring bin.
Preferably, the vibration device further comprises a contact piece, the contact piece is arranged on the outer wall of the discharge channel, and one end of the contact piece is abutted to limit the vibration range of the vibration piece.
Preferably, the conflict piece includes semicircle stop collar and right angle connecting rod, right angle connecting rod one end is fixed on the discharge passage outer wall, the right angle connecting rod other end is fixed with the semicircle stop collar.
The invention has the advantages that: at the laying process on the rubble mixture bed is stabilized to cement, and the vibrating part carries out the vibration operation to the rubble mixture is stabilized to the cement that just falls on the road bed for the rubble mixture tiling is even to the cement on the road bed, and the material between the rubble skeleton is filled more fully, rolling, can make the rubble mixture bed is stabilized to cement compacter, and the rubble mixture bed can not produce the crack phenomenon, makes its life increase to the cement.
Drawings
FIG. 1 is a schematic structural view illustrating a method for processing cement stabilized macadam according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a vibrating element according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of the connection between a plurality of vibrating members according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a limiting member according to an embodiment of the invention;
FIG. 5 is a schematic view of the structure of the junction between the discharge passage and the interference member according to the embodiment of the present invention;
fig. 6 is a schematic structural view of an interference member according to an embodiment of the present invention.
Reference numbers in the figures: 10. mixing and stirring storehouse, 20, discharge passage, 30, removal wheel, 40, locating part, 41, stop collar, 42, dead lever, 50, vibrating part, 51, vibrating motor, 52, transmission shaft, 53, inoxidizing coating, 531, connecting rope, 60, the cement stabilized macadam mixture layer, 70, conflict piece, 71, semicircle stop collar, 72, right angle connecting rod.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1, the method for processing cement stabilized macadam according to the embodiment includes the following steps:
s1, calculating the mixing proportion of the cement stabilized macadam mixture, and stirring and mixing the cement stabilized macadam mixture;
s2, paving the cement stabilized macadam mixture layer 60 on the roadbed, wherein in the paving process, the vibration piece 50 vibrates the cement stabilized macadam mixture, and the vibration piece moves along with the paving position of the cement stabilized macadam mixture;
s3, after the cement stabilized macadam mixture is vibrated by the vibrating piece 50, rolling the cement stabilized macadam mixture layer 60;
s4, curing the cement stabilized macadam mixed material layer 60 until the strength of the cement stabilized macadam mixed material layer 60 is not less than 3.5 MPa.
By the method, materials between broken stone frameworks in the cement stabilized broken stone mixed material layer 60 can be filled more fully, and meanwhile, the surface of the cement stabilized broken stone mixed material layer 60 can be smoother, so that an asphalt layer is laid on the top of the cement stabilized broken stone mixed material layer 60 to be better in effect.
As shown in fig. 2, the vibrating member 50 is disposed inside the cement stabilized macadam mixture layer, and vibrates to drive the cement stabilized macadam mixture layer which is just laid to vibrate.
Vibrating member 50 includes vibrating motor 51, transmission shaft 52 and inoxidizing coating 53, vibrating motor 51 sets up and is close to bottom position department at mixing stirring storehouse 10 lateral wall, the transmission is connected with transmission shaft 52 on vibrating motor 51, the parcel has inoxidizing coating 30 on the transmission shaft 52, inoxidizing coating 30 vibrates and drives cement stabilization rubble mixture layer 60 and vibrate.
Vibrating motor 51 work drives transmission shaft 52 and vibrates to drive the inoxidizing coating 53 on the transmission shaft 52 vibration, make it more even to lay cement stabilization rubble mixture, and the material between the rubble skeleton is filled more fully, and the result of use is better.
As shown in fig. 3, the plurality of vibrating members 50 are arranged side by side, and the connecting rope 531 is fixed between every two vibrating members 50, so that the plurality of vibrating members 50 can be connected into one piece, thereby vibrating the cement stabilized macadam mixture in a large area, and improving the laying efficiency of the cement stabilized macadam mixture layer 60.
As shown in fig. 1, the mixing and stirring bin 10 stores cement stabilized macadam mixture, the bottom of the mixing and stirring bin 10 is uniformly provided with a plurality of movable wheels 30, the side wall of the mixing and stirring bin 10 is located on one side of the vibrating piece 50 and is communicated with a discharge passage 20, and the discharge passage 20 conveys the cement stabilized macadam mixture in the mixing and stirring bin 10.
The discharge passage 20 conveys the cement stabilized macadam mixture to the roadbed, and the vibrating member 50 performs vibration processing on the cement stabilized macadam mixture which has just fallen.
Mix stirring storehouse 10 lateral wall and be located vibrating part 50 one side intercommunication and have discharge passage 20, discharge passage 20 is located vibrating part 50's top, can make the cement of discharging on discharge passage 20 stabilize rubble mixture and in time carry out the vibration operation, avoids cement to stabilize rubble mixture and places production solidification phenomenon for a long time, and the result of use is better. .
As shown in fig. 4, the bottom of the mixing and stirring bin 10 is provided with a limiting member 40 for limiting the position of the protective layer 53.
As shown in fig. 4, the limiting member 40 includes a limiting sleeve 41 and a fixing rod 42, the limiting sleeve 41 is sleeved on the protective layer 53, the limiting sleeve 41 is connected to one end of the fixing rod 42, and the other end of the fixing rod 42 is fixed at the bottom of the mixing and stirring bin 10.
The stop collar 41 is sleeved on the protective layer 53 and is close to one side of the mixing and stirring bin 10, so that the position of one end of the vibrating piece 50 is limited, the vibrating piece 50 is prevented from generating large amplitude in the vibrating process, and the vibrating effect of the cement stabilized macadam mixture is better.
As shown in fig. 5 to 6, the vibration-damping device further includes a contact member 70, the contact member 70 is disposed on the outer wall of the discharge passage 20, and one end of the contact member 70 is abutted against the vibration-limiting member 50 to limit the vibration range.
The contact part 70 comprises a semicircular limiting sleeve 71 and a right-angle connecting rod 72, one end of the right-angle connecting rod 72 is fixed on the outer wall of the discharge channel 20, and the other end of the right-angle connecting rod 72 is fixed with the semicircular limiting sleeve 71.
The thickness of the right-angle connecting rod 72 is the thickness of the blade, so that when the right-angle connecting rod 72 moves along with the discharge channel 20, the contact surface between the right-angle connecting rod 72 and the cement-stabilized macadam mixture layer 60 is reduced, the situation that the movement of the right-angle connecting rod 72 affects the laying of the cement-stabilized macadam mixture layer 60 is avoided, and meanwhile, the movement of the right-angle connecting rod 72 can be smoother;
through the setting of contact piece 70, can assist the vibration scope of restriction vibrating part 50, avoid vibrating part 50 at the in-process of vibration, produce the phenomenon that breaks away from cement and stabilize rubble mixture layer 60, can avoid producing the phenomenon of colliding with between two liang of vibrating parts 50 simultaneously for vibrating part 50's life increases.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for processing cement stabilized macadam is characterized in that: the method comprises the following steps:
s1, calculating the mixing proportion of the cement stabilized macadam mixture, and stirring and mixing the cement stabilized macadam mixture;
s2, paving a cement stabilized macadam mixed material layer (60) on the roadbed, wherein in the paving process, a vibrating piece (50) vibrates the cement stabilized macadam mixed material, and the vibrating piece moves along with the paving position of the cement stabilized macadam mixed material;
s3, after the cement stabilized macadam mixture is vibrated by the vibrating piece (50), rolling the cement stabilized macadam mixture layer (60) immediately;
s4, curing the cement stabilized macadam mixed material layer (60) until the strength of the cement stabilized macadam mixed material layer (60) is not less than 3.5 MPa.
2. The method for processing cement stabilized macadam according to claim 1, characterized in that: the vibrating piece (50) is arranged inside the cement stabilized macadam mixed material layer, and the vibrating piece vibrates to drive the cement stabilized macadam mixed material layer which is just laid to vibrate.
3. The method for processing cement stabilized macadam according to claim 1, characterized in that: vibrating member (50) include vibrating motor (51), transmission shaft (52) and inoxidizing coating (53), vibrating motor (51) set up and mix stirring storehouse (10) lateral wall and be close to bottom position department, the transmission connection has transmission shaft (52) on vibrating motor (51), the parcel has inoxidizing coating (30) on transmission shaft (52), inoxidizing coating (30) vibration drives cement stabilization rubble mixture bed (60) and vibrates.
4. A cement stabilized macadam processing method according to claim 3, characterized in that: the vibrating pieces (50) are arranged side by side, and a connecting rope (531) is fixed between every two vibrating pieces (50).
5. A cement stabilized macadam processing method according to claim 3, characterized in that: cement stabilized macadam mixture is deposited in mixing and stirring storehouse (10), mixing and stirring storehouse (10) bottom evenly is equipped with a plurality of wheels of removing (30), mixing and stirring storehouse (10) lateral wall is located vibration piece (50) one side intercommunication has discharge passage (20), discharge passage (20) carry the cement stabilized macadam mixture in the mixing and stirring storehouse (10).
6. The method of processing cement stabilized macadam according to claim 5, characterized in that: the discharge passage (20) conveys the cement stabilized macadam mixture to the roadbed, and the vibrating piece (50) carries out vibration treatment on the cement stabilized macadam mixture which just falls down.
7. A cement stabilized macadam processing method according to claim 3, characterized in that: the bottom of the mixing and stirring bin (10) is provided with a limiting piece (40) for limiting the position of the protective layer (53).
8. The method of processing cement stabilized macadam according to claim 7, characterized in that: the limiting part (40) comprises a limiting sleeve (41) and a fixing rod (42), the limiting sleeve (41) is sleeved on the protective layer (53), the limiting sleeve (41) is connected with one end of the fixing rod (42), and the other end of the fixing rod (42) is fixed at the bottom of the mixing and stirring bin (10).
9. The method of processing cement stabilized macadam according to claim 8, characterized in that: the vibration limiting device further comprises a contact piece (70), wherein the contact piece (70) is arranged on the outer wall of the discharge channel (20), and one end of the contact piece (70) is abutted to limit the vibration range of the vibration piece (50).
10. The method of processing cement stabilized macadam according to claim 9, characterized in that: the contact piece (70) comprises a semicircular limiting sleeve (71) and a right-angle connecting rod (72), one end of the right-angle connecting rod (72) is fixed on the outer wall of the discharge channel (20), and the other end of the right-angle connecting rod (72) is fixed with the semicircular limiting sleeve (71).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111315541.XA CN113832807A (en) | 2021-11-08 | 2021-11-08 | Cement stabilized macadam processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111315541.XA CN113832807A (en) | 2021-11-08 | 2021-11-08 | Cement stabilized macadam processing method |
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| Publication Number | Publication Date |
|---|---|
| CN113832807A true CN113832807A (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111315541.XA Pending CN113832807A (en) | 2021-11-08 | 2021-11-08 | Cement stabilized macadam processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286298A (en) * | 2022-01-27 | 2022-11-04 | 山东建筑大学 | Cement and crushed stone mixture and processing and paving method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2756691Y (en) * | 2004-12-14 | 2006-02-08 | 任志红 | Multifunction concrete paving and vibrating machine |
| JP2015028240A (en) * | 2013-07-30 | 2015-02-12 | 大成ロテック株式会社 | Inner vibrator device and construction method of concrete paved body |
| CN108486979A (en) * | 2018-03-28 | 2018-09-04 | 中交公局第三工程有限公司 | Cement stabilized macadam construction Craft |
| CN210712461U (en) * | 2019-08-06 | 2020-06-09 | 湖州市政工程有限公司 | Vibration device that town road construction was used |
| CN111395117A (en) * | 2020-03-24 | 2020-07-10 | 安徽中桥建设集团有限公司 | Road surface paving device for highway construction |
-
2021
- 2021-11-08 CN CN202111315541.XA patent/CN113832807A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2756691Y (en) * | 2004-12-14 | 2006-02-08 | 任志红 | Multifunction concrete paving and vibrating machine |
| JP2015028240A (en) * | 2013-07-30 | 2015-02-12 | 大成ロテック株式会社 | Inner vibrator device and construction method of concrete paved body |
| CN108486979A (en) * | 2018-03-28 | 2018-09-04 | 中交公局第三工程有限公司 | Cement stabilized macadam construction Craft |
| CN210712461U (en) * | 2019-08-06 | 2020-06-09 | 湖州市政工程有限公司 | Vibration device that town road construction was used |
| CN111395117A (en) * | 2020-03-24 | 2020-07-10 | 安徽中桥建设集团有限公司 | Road surface paving device for highway construction |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115286298A (en) * | 2022-01-27 | 2022-11-04 | 山东建筑大学 | Cement and crushed stone mixture and processing and paving method thereof |
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Application publication date: 20211224 |
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