CN111778780A - Asphalt graded broken stone foundation bed for high-speed railway and construction method thereof - Google Patents
Asphalt graded broken stone foundation bed for high-speed railway and construction method thereof Download PDFInfo
- Publication number
- CN111778780A CN111778780A CN202010169953.6A CN202010169953A CN111778780A CN 111778780 A CN111778780 A CN 111778780A CN 202010169953 A CN202010169953 A CN 202010169953A CN 111778780 A CN111778780 A CN 111778780A
- Authority
- CN
- China
- Prior art keywords
- asphalt
- graded broken
- broken stone
- stone
- asphalt graded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010426 asphalt Substances 0.000 title claims abstract description 249
- 239000004575 stone Substances 0.000 title claims abstract description 173
- 238000010276 construction Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 32
- 238000005056 compaction Methods 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000012423 maintenance Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 50
- 238000003825 pressing Methods 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 23
- 238000003892 spreading Methods 0.000 claims description 23
- 230000007480 spreading Effects 0.000 claims description 23
- 238000005096 rolling process Methods 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000003068 static effect Effects 0.000 claims description 17
- 239000002344 surface layer Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 239000012744 reinforcing agent Substances 0.000 claims description 11
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000000754 repressing effect Effects 0.000 claims description 6
- 235000019738 Limestone Nutrition 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 239000006028 limestone Substances 0.000 claims description 5
- 238000011068 loading method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000009490 roller compaction Methods 0.000 claims 2
- 230000002706 hydrostatic effect Effects 0.000 claims 1
- 239000000945 filler Substances 0.000 abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 2
- 239000011384 asphalt concrete Substances 0.000 description 10
- 239000011800 void material Substances 0.000 description 10
- 238000005507 spraying Methods 0.000 description 8
- 230000002265 prevention Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 238000005204 segregation Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000003963 antioxidant agent Substances 0.000 description 3
- 230000003078 antioxidant effect Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004595 color masterbatch Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- -1 pentaerythritol ester Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 229920000346 polystyrene-polyisoprene block-polystyrene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- KAKZBPTYRLMSJV-UHFFFAOYSA-N vinyl-ethylene Natural products C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/001—Track with ballast
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/008—Drainage of track
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B27/00—Placing, renewing, working, cleaning, or taking-up the ballast, with or without concurrent work on the track; Devices therefor; Packing sleepers
- E01B27/02—Placing the ballast; Making ballastway; Redistributing ballasting material; Machines or devices therefor; Levelling means
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a construction method of a high-speed railway asphalt graded crushed stone foundation bed, which comprises the following steps: construction preparation, permeable asphalt and/or sticky asphalt distribution, asphalt graded broken stone mixing, asphalt graded broken stone transportation, asphalt graded broken stone paving, asphalt graded broken stone compaction and asphalt graded broken stone maintenance. The invention also provides a high-speed railway asphalt graded crushed stone foundation bed prepared by the method. As a new roadbed structure form of the high-speed railway, the asphalt graded broken stone foundation bed prepared by the construction method can save roadbed fillers, improve the bearing capacity and waterproof and drainage capacity of the roadbed, prolong the service life of the roadbed, has wide application prospect and has obvious economic and social benefits.
Description
Technical Field
The invention belongs to the technical field of high-speed railway roadbed structures. Specifically, the invention relates to a high-speed railway asphalt graded crushed stone foundation bed and a construction method thereof.
Background
The main foundation bed structure of the high-speed railway in China mainly comprises a foundation bed surface layer and a foundation bed bottom layer, wherein the foundation bed surface layer is I-type or II-type graded broken stones of the railway, and cement can be added into the graded broken stones if the frost heaving prevention of the railway bed is considered; the bed bottom layer was made up of A, B sets of packing.
The asphalt graded broken stone consists of asphalt, coarse aggregate, fine aggregate, limestone powder, asphalt reinforcing agent and the like, and has the characteristics of good water resistance, bearing capacity, cracking resistance and fatigue resistance. The asphalt graded broken stone is paved on the surface of the foundation bed surface layer in a full-section way and is used as a part of the foundation bed surface layer, so that the stress state and the waterproof and drainage capacity of the foundation bed structure can be improved, the optimization of the high-speed railway roadbed structure is realized, roadbed filling materials are saved, the service performance of the high-speed railway roadbed is improved, the service life of the high-speed railway roadbed is prolonged, and the asphalt graded broken stone has remarkable economic and social benefits.
The compaction quality of the asphalt graded broken stone and the temperature control in the whole construction process directly influence the service performance and the service life of the asphalt graded broken stone foundation bed. The main factors influencing the compaction effect of the asphalt graded broken stones comprise the matching combination of temperature control and compaction machinery in the whole construction process. If the construction temperature of each link is too high, the asphalt graded broken stone is aged, and the service life of the asphalt graded broken stone is influenced; if the construction temperature of each link is too low, the viscosity of the asphalt material is high, so that the asphalt graded broken stone is difficult to compact to a target void ratio (design void ratio), and the performance requirement of indoor mixing ratio can not be met. Therefore, the construction temperature of each link of the asphalt graded broken stone needs to be reasonably controlled, and the aging of the asphalt graded broken stone is avoided while the construction workability is ensured. In addition, according to the characteristics of the asphalt graded crushed stone material, it is important to clearly control the compaction work required for compacting to a target void ratio (designed void ratio) or a target compaction degree, reasonably select a compaction machine, and determine a combination mode of the compaction machine.
Therefore, it is urgently needed to provide a high-speed railway asphalt graded crushed stone foundation bed structure and form a matched construction method to ensure the construction quality and the implementation effect of the foundation bed structure.
Disclosure of Invention
The invention aims to provide a construction method for ensuring the construction quality and the use effect of a high-speed railway asphalt graded broken stone foundation bed.
The above object of the present invention is achieved by the following means.
In the context of the present invention, the term "aggregate" refers to granules comprising fine aggregates and coarse aggregates which act as a framework and a filler in the mix, including crushed stone, gravel, machine-made sand, stone chips, sand and the like. The coarse aggregate is crushed stone with the particle size of more than 2.36mm, crushed gravel, screened gravel, slag and the like; the fine aggregate refers to natural sand, artificial sand (including machine-made sand), stone chips and the like with the particle size of less than 2.36 mm.
In the context of the present invention, the term "asphalt reinforcing agent" may be a commercially available asphalt reinforcing agent, preferably the "aggregate interface reinforcing agent for asphalt concrete" disclosed in patent application No. 201711236017.7, which is incorporated herein by reference in its entirety. The asphalt reinforcing agent is prepared from the following components in percentage by weight: 10-50% of elastomer, 30-50% of synthetic resin, 5-30% of fusion oil, 0-0.5% of color master batch and 0.25-1.25% of antioxidant. The elastomer is one or more of styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer and polystyrene butadiene copolymer. The synthetic resin is one or more of petroleum resin, polyethylene resin and polystyrene resin. The fusion oil is one or more of kerosene, lubricating engine oil and diesel oil. The color master is resin pigment. The antioxidant is rosin pentaerythritol ester. The preparation method of the asphalt reinforcing agent comprises the following steps: sequentially adding the elastomer, the synthetic resin, the color master and the antioxidant into a stirrer for stirring, then adding the fusion oil for continuously stirring uniformly, and standing for 24 hours at normal temperature; uniformly mixing and melting the mixture by a screw machine at the temperature of 110-180 ℃, extruding and molding the mixture, and cooling and cutting the mixture to form a cylindrical granular product.
On one hand, the invention provides a construction method of a high-speed railway asphalt graded crushed stone foundation bed, which comprises the following steps:
(1) preparation for construction
Rechecking the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed to ensure that the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed meet the regulations in the design Specifications for railway subgrades TB10001 and the design Specifications for high-speed railways TB 10621; then, hanging a construction lead or a guide beam for controlling the elevation of the top surface of the asphalt graded crushed stone;
(2) spreading of permeable asphalt and/or adhesive layer asphalt
When the design thickness of the asphalt graded broken stone is less than or equal to 10cm, designing, paving and compacting according to a layer of asphalt graded broken stone layer;
when the design thickness of the asphalt graded broken stone is more than 10cm, the asphalt graded broken stone is designed in a layered mode and paved and compacted in a layered mode;
distributing permeable asphalt between the graded crushed stone layer and the asphalt graded crushed stone layer on the surface layer of the foundation bed, and distributing adhesive layer asphalt between the asphalt graded crushed stone layers;
(3) mixing of asphalt graded crushed stone
Controlling the heating temperature of the asphalt to be 160-190 ℃, wherein the heating temperature of the aggregate is 10-30 ℃ higher than that of the asphalt; mixing the heated asphalt, the heated aggregate, the limestone powder and the asphalt reinforcing agent by using an intermittent mixer to form asphalt graded broken stone, and controlling the discharge temperature of the asphalt graded broken stone to be 170-195 ℃;
(4) transportation of asphalt graded crushed stone
A material transporting vehicle with the load of more than 12 tons is adopted to transport asphalt graded broken stones, and balanced loading is carried out when the material transporting vehicle is loaded from a mixer, so as to prevent coarse aggregate and fine aggregate from being separated;
(5) paving of asphalt graded broken stone
Paving by using a full-automatic asphalt paver, and preheating a screed plate of the paver to be more than 100 ℃ before paving; the temperature of the asphalt graded broken stone before paving is not lower than 160 ℃;
(6) compaction of asphalt graded macadam
Compacting by adopting initial pressure, re-pressure and final pressure according to a mode of combining a steel wheel road roller and a tire type road roller;
(7) maintenance of asphalt graded crushed stone
And after the spreading layer of the asphalt graded broken stone is completely and naturally cooled and the surface temperature of the asphalt graded broken stone is lower than 50 ℃, the traffic can be opened.
Preferably, in the method of the present invention, the construction preparation in the step (1) further includes ensuring the following construction conditions: the construction is not carried out under the conditions of strong wind and rain with the temperature lower than 10 ℃, 5 grades and above.
Preferably, in the method of the present invention, the spreading amount of the asphalt for the sticky layer in the step (2) is 0.3 to 0.6L/m2。
Preferably, in the method of the present invention, the amount of the through-layer asphalt to be spread in the step (2) is 0.7 to 2.0L/m2。
Preferably, in the method of the present invention, after the permeable asphalt in the step (2) is spread, the traffic is closed, and after the permeable asphalt is fully penetrated and the moisture evaporation is completed, the asphalt graded crushed stone is paved within 48 hours.
Preferably, in the method of the present invention, the sticky asphalt in step (2) is spread on the day of paving the asphalt graded broken stone, and after the sticky asphalt is demulsified and the water evaporation is completed, the paving of the asphalt graded broken stone is followed.
Preferably, in the method of the present invention, when the asphalt graded crushed stone in the step (2) is designed according to one layer, the asphalt graded crushed stone with the specification of AGCS-16 is selected; when the asphalt graded broken stones in the step (2) are designed in a layered mode, the first layer is the asphalt graded broken stones with the specification of AGCS-16 from top to bottom, and the other layers are the asphalt graded broken stones with the specification of AGCS-20 or AGCS-25 respectively and independently.
In the present invention, the Asphalt Graded Crushed Stone can be classified into three specifications of AGCS-25, AGCS-20 and AGCS-16, wherein AGCS represents Asphalt Graded Crushed Stone (AGCS), and the numerical value represents nominal maximum particle size of aggregate in mm. For example, AGCS-16 represents an asphalt graded crushed stone having an aggregate nominal maximum particle size of 16 mm.
Preferably, in the method of the present invention, the production cycle per disc of the batch mixer in the step (3) is not less than 45s, and the dry mixing time is not less than 10 s.
Preferably, in the method of the invention, the spreading speed of the spreading machine in the step (5) is controlled to be 1-3 m/min.
Preferably, in the method of the invention, the total mass of the steel-wheel road roller in the step (6) is not less than 12t, the vibration frequency is 35-50 Hz, and the amplitude is 0.3-0.8 mm.
Preferably, in the method of the present invention, the total mass of the tyre roller in step (6) is not less than 25t, the pressure of each tyre is not less than 15kN, the tyre inflation pressure in a cold state is not less than 0.55MPa, the air pressure after tyre heating is not less than 0.6MPa, and the air pressure of each tyre is substantially the same.
Preferably, in the method, the preliminary pressing in the step (6) comprises the step of carrying out static pressing on a steel wheel road roller for 2-4 times, wherein the internal temperature of the asphalt graded macadam at the beginning of the preliminary pressing is not lower than 150 ℃; and the static pressure rolling speed of the steel wheel road roller is 2-3 km/h.
Preferably, in the method of the present invention, the re-pressing in step (6) includes 4-6 times of vibration pressing of a steel-wheel road roller, and 4-8 times of compacting of a rubber-tyred road roller; the vibration and compression rolling speed of the steel wheel road roller is 3-5 km/h; the rolling speed of the rubber-tyred road roller is 3-6 km/h; the repressing is carried out closely after the initial pressure is finished.
Preferably, in the method of the present invention, the final pressing in step (6) includes static pressing of a steel-wheel roller for 2-4 times; the static pressure rolling speed of the steel wheel road roller is 3-6 km/h; the surface temperature of the asphalt graded crushed stone after the final pressure is finished is not lower than 90 ℃.
In another aspect, the invention provides a high-speed railway asphalt graded crushed stone foundation bed prepared by the method.
The invention has the following beneficial effects:
(1) the asphalt graded broken stone is ensured to be molded on site to a target void ratio (design void ratio), a target compaction degree is achieved, and the compaction effect of the asphalt graded broken stone is ensured.
(2) The molding quality such as the flatness, the thickness, the gradient and the like of the asphalt graded broken stone can meet the requirements.
(3) The performances of water resistance, bearing and the like of the asphalt graded broken stone are ensured to meet the design requirements.
(4) The construction method can be used for guiding the construction of the asphalt graded broken stone foundation bed of the high-speed railway, standardizing the process flow and perfecting the quality control system.
(5) As a new roadbed structure form of the high-speed railway, the asphalt graded broken stone foundation bed prepared by the construction method can save roadbed fillers, improve the bearing capacity and waterproof and drainage capacity of the roadbed, prolong the service life of the roadbed, has wide application prospect and has obvious economic and social benefits.
Detailed Description
The present invention is described in further detail below with reference to specific embodiments, which are given for the purpose of illustration only and are not intended to limit the scope of the invention.
The construction method of the asphalt graded broken stone foundation bed mainly comprises the following steps: construction preparation, permeable asphalt and/or sticky asphalt distribution, asphalt graded broken stone mixing, asphalt graded broken stone transportation, asphalt graded broken stone paving, asphalt graded broken stone compaction and asphalt graded broken stone maintenance.
1. Preparation for construction
Before asphalt graded broken stone construction, a roadbed deformation observation device, a cable trough, a drainage ditch, a water collecting well, a contact net support, a pre-buried pipeline, a pre-buried cable and the like are treated and protected.
Before the asphalt graded broken stone is constructed, the top surface elevation, the geometric dimension and the quality of the graded broken stone on the surface layer of the foundation bed are rechecked, and the standard of the design Specification of railway subgrade TB10001 and the design Specification of high-speed railway TB10621 is met.
And after rechecking is qualified, performing construction lofting on the asphalt graded broken stones. And hanging a construction lead or a guide beam for controlling the elevation of the top surface of the asphalt concrete, and rechecking the elevation. The construction can not be carried out under the conditions of strong wind and rain with the temperature lower than 10 ℃, 5 grades and above.
2. Spreading permeable asphalt and/or adhesive layer asphalt
When the design thickness of the asphalt graded broken stone is less than or equal to 10cm, designing according to one layer, and paving, compacting and the like according to one layer; when the thickness exceeds 10cm, designing according to two layers, and paving, compacting and the like in a layering manner; when the asphalt graded broken stone is designed into two layers, the adhesive layer asphalt must be sprayed between the asphalt graded broken stone layers, and the adhesive layer asphalt can be uniformly sprayed by adopting an asphalt spraying vehicle or a manual asphalt spraying machine, and the recommended spraying amount of the adhesive layer asphalt is 0.3-0.6L/m2。
Before the permeable layer asphalt and/or the sticky layer asphalt are/is scattered, scum of the graded broken stone layer is cleaned, and structures such as a cable trough, a water collecting well, a contact net support foundation and the like are shielded to avoid pollution.
The permeable asphalt is sprayed uniformly by an asphalt spraying vehicle at one time, when the leakage is missed, manual spraying is needed, when the redundant permeable asphalt does not permeate into the surface layer of the foundation bed, coarse sand is needed to be spread on the part, and proper rolling is needed. The recommended spreading amount of the permeable asphalt is 0.7-2.0L/m2。
After the permeable asphalt is spread, the traffic is closed, and after the permeable asphalt is fully permeated and the water is evaporated (usually, the water is evaporated for 24 hours), the asphalt graded broken stone is paved within 48 hours.
The adhesive layer asphalt is preferably sprayed on the day of paving the asphalt graded broken stone, and after demulsification and water evaporation are finished, the adhesive layer asphalt is closely paved with the asphalt graded broken stone to ensure that the adhesive layer asphalt is not polluted.
Description of the drawings:
the permeable asphalt is as follows: in order to ensure that the asphalt graded gravel layer and the graded gravel layer are well combined, a thin layer which penetrates into the surface of the graded gravel layer to a certain depth and is formed by spraying emulsified asphalt on the graded gravel layer. The sticky layer asphalt is as follows: a thin layer of bituminous material distributed to enhance the bond between the bituminous graded gravel layer and the bituminous graded gravel layer.
3. Mixing of asphalt graded crushed stone
The asphalt graded broken stone is preferably produced by adopting an intermittent mixer, the number of cold storage bins of the intermittent mixer meets the requirement of the mixing ratio, is not less than 5-6, and the intermittent mixer is provided with equipment for adding an asphalt reinforcing agent.
The heating temperature of the asphalt is 160-190 ℃, and the heating temperature of the aggregate is 10-30 ℃ higher than that of the asphalt.
The mixing time of the asphalt graded broken stone is determined according to the trial mixing, and the degree of uniformly coating aggregate with the asphalt is taken as the degree. The production cycle of each plate of the batch mixer is not less than 45s, wherein the dry mixing time is not less than 5-10 s.
The discharge temperature of the asphalt graded broken stone is 170-195 ℃. The discharge temperature is over 200 ℃, the asphalt graded broken stone which is produced by the steps of whitening materials, agglomerating into blocks and seriously separating coarse and fine aggregates is discarded.
4. Transportation of asphalt graded crushed stone
The asphalt graded broken stone is preferably transported by a large tonnage such as a material transporting vehicle with a load of more than 15 tons, and heat preservation, rain prevention and pollution prevention measures are adopted. A large-tonnage material conveying vehicle is adopted, so that the temperature loss in the transportation process is reduced, and the arrival temperature of the asphalt graded crushed stones is ensured.
When the material is loaded from the mixer to the material transporting vehicle, the vehicle position should be moved for many times to balance the loading and prevent the segregation of coarse and fine aggregates. The arrival temperature of the asphalt graded broken stone is not lower than 160 ℃.
5. Paving of asphalt graded broken stone
The asphalt graded broken stone is paved by adopting a full-automatic asphalt paver. Before construction, the screed of the asphalt paver is preheated to more than 100 ℃. The temperature of the asphalt graded broken stone before paving is not lower than 160 ℃. The paver should adopt an automatic leveling mode, the paver should work slowly, uniformly and continuously during paving, the paving speed should be controlled within 1-3 m/min, the speed cannot be changed randomly or stopped midway, and obvious segregation, waves, cracks and drag marks cannot be generated.
The paving mode is reasonably determined according to the paving section form, and when a plurality of pavers operate, the echelon operation is adopted. If the ballast track asphalt graded broken stone foundation bed is available, 2 spreading machines can be adopted for ladder operation, and the ballastless track asphalt graded broken stone foundation bed can be adopted for ladder operation of 3 spreading machines.
6. Compaction of asphalt graded macadam
The compaction of the asphalt graded broken stone can be divided into initial compaction, re-compaction and final compaction, and the compaction is carried out according to the combined mode of a steel wheel road roller and a tire type road roller.
The total mass of the steel wheel road roller is not less than 12t, the vibration frequency is 35-50 Hz, and the amplitude is 0.3-0.8 mm.
The total mass of the tyre type road roller is not less than 25t, the pressure of each tyre is not less than 15kN, the inflation pressure of the tyre in a cold state is not less than 0.55MPa, the tyre is not less than 0.6MPa after heating, and the air pressure of each tyre is approximately the same.
The initial pressing comprises 2-4 times of static pressure of the steel wheel road roller, the static pressure rolling speed of the steel wheel road roller is 2-3 km/h, and the internal temperature of the asphalt graded broken stone at the beginning of the initial pressing is not lower than 150 ℃.
The re-pressing comprises the steps that the steel wheel road roller vibrates for 4-6 times, and the vibration rolling speed of the steel wheel road roller is 3-5 km/h; compacting for 4-8 times by using a rubber-tyred roller, wherein the rolling speed of the rubber-tyred roller is 3-6 km/h; the repression is carried out closely after the initial pressure is finished.
And the final pressing comprises 2-4 times of static pressure of the steel wheel road roller, the static pressure rolling speed of the steel wheel road roller is 3-6 km/h, and the surface temperature of the asphalt graded broken stone after the re-pressing is finished is not lower than 90 ℃.
For the parts of the large road roller which are difficult to operate, a small vibration road roller or an impact rammer is adopted for rolling. The roller must not turn around, add water or stay on the non-rolled section. The road roller needs to slow down and slowly move when being started and stopped, and emergency braking and braking are not needed. The initial pressing, the re-pressing and the final pressing are all carried out at the highest temperature without generating pushing and cracks.
7. Maintenance of asphalt graded crushed stone
After the construction is completed, all the construction machines should exit from the finished operation area on the same day. Before traffic is not opened, any vehicles are prohibited from driving in, and no heavy objects can be placed on the surface.
And after the spreading layer of the asphalt concrete is completely and naturally cooled and the surface temperature of the asphalt concrete is lower than 50 ℃, the traffic can be opened.
Example 1
For a certain work point, the designed thickness of the asphalt graded broken stone foundation bed is 8cm, and the specification of the adopted asphalt graded broken stone is AGCS-16. And constructing the sections of the construction site with the construction conditions in 4 days.
Day 1:
(1) before the asphalt graded broken stone is constructed, the built-in pipelines and cables are checked and confirmed to be constructed, and the situation that the integrity of the asphalt graded broken stone is damaged due to excavation after the asphalt graded broken stone is finished is avoided. (2) The pollution-proof blanket is adopted to protect a cable trough drainage ditch, a water collecting well, a contact net support and the like. (3) And protecting the road base deformation observation device by using a known protection device. (4) Rechecking the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed to ensure that the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed meet the regulations in the design Specifications for railway subgrades TB10001 and the design Specifications for high-speed railways TB 10621; (5) and after rechecking is qualified, cleaning the scum on the surface of the graded crushed stone layer.
Day 2:
(1) spreading prime coat asphalt by using asphalt spreading vehicle, wherein the spreading amount of the prime coat asphalt is 1.2L/m2(ii) a (2) Hanging a construction guide beam for controlling the elevation of the top surface of the asphalt concrete, wherein the setting height of the guide beam is in consideration of the loose paving coefficient of asphalt graded crushed stones so as to ensure that the compaction thickness of the guide beam is 8 cm; (3) and (5) closing the traffic for 24h, and fully permeating the asphalt of the permeable layer and evaporating water.
Day 3:
the production is carried out by adopting a 3000 type intermittent mixer, and the mixer is provided with 6 cold material bins and a feed inlet for adding an admixture. The heating temperature of the asphalt is 175 ℃, and the heating temperature of the aggregate is 190 ℃. According to aggregate dry mixing for 10s, adding preheated modified asphalt, limestone powder and asphalt reinforcing agent, mixing for 50s, wherein the total mixing time is 60s, and the mixing temperature is 185 ℃. The discharging temperature is controlled according to 185-195 ℃. The asphalt graded broken stone with the discharge temperature of more than 200 ℃, white material, agglomeration and blocking, and serious segregation of coarse and fine aggregates is discarded.
The material transporting vehicle with the weight of more than 12t is adopted for transportation, and heat preservation, rain prevention and pollution prevention measures are adopted. When the material is loaded from the mixer to the material transporting vehicle, the vehicle position should be moved for many times to balance the loading and prevent the segregation of coarse and fine aggregates. Ensuring that the on-site temperature of the asphalt graded broken stone is not lower than 165 ℃.
Paving is carried out by adopting a full-automatic asphalt paver and an automatic leveling mode. Before construction, an ironing plate of an asphalt paver is preheated to more than 100 ℃, the temperature of asphalt graded broken stones before paving is ensured to be not lower than 165 ℃, the working point is a ballastless track section, 3 pavers are adopted for step operation, and the paving speed is preferably controlled to be 1.5 m/min.
Selecting a steel wheel road roller with the weight of 13t, the vibration frequency of 50Hz and the amplitude of 0.5 mm; the tyre type road roller with the total weight of 30t, the pressure of each tyre of 18kN, the tyre inflation pressure of 0.6MPa in a cold state, the tyre heating pressure of 0.65MPa and the air pressure of each tyre of the same degree is selected. The primary pressing procedure is that the steel wheel road roller is subjected to static pressure for 4 times, the rolling speed is 2km/h, and the internal temperature of the asphalt graded broken stone at the beginning of primary pressing is not lower than 160 ℃; after the initial pressing is finished, carrying out the repressing tightly, wherein the repressing process comprises the steps of vibrating and pressing for 4 times by a steel wheel road roller and the vibrating and pressing rolling speed of the steel wheel road roller is 3 km/h; compacting for 8 times by using a rubber-tyred road roller, wherein the rolling speed of the rubber-tyred road roller is 3 km/h; and the final pressing comprises 2 times of static pressure of the steel wheel road roller, the static pressure rolling speed of the steel wheel road roller is 3km/h, and the surface temperature of the asphalt graded broken stone after the final pressing is finished is not lower than 100 ℃.
After the construction is completed, all the construction machines should exit from the finished operation area on the same day. Before traffic is not opened, any vehicles are prohibited from driving in, and no heavy objects can be placed on the surface.
Day 4:
and after the asphalt concrete spreading layer is completely and naturally cooled and the surface temperature of the asphalt graded broken stone is lower than 50 ℃, the traffic can be opened.
Through detection, the compactness of the asphalt graded macadam in the construction section of the construction site is 99.6%, the water permeability coefficient is 0mL/min, and the void ratio is 1.75%, which indicates that the asphalt graded macadam meets the requirements of the designed void ratio (less than 4%) and the target compactness (more than 98%), and has good waterproof performance (the water permeability coefficient is less than or equal to 60 mL/min).
Example 2
For a certain work point, the designed thickness of the asphalt graded broken stone foundation bed is 15cm, the specification of the upper layer of asphalt graded broken stone is AGCS-16, and the thickness is controlled according to 8 cm; the specification of the lower layer asphalt graded broken stone is AGCS-20, and the thickness is controlled according to 7 cm; and constructing the sections of the construction site with the construction conditions in 5 days.
Day 1:
(1) before the asphalt graded broken stone is constructed, the built-in pipelines and cables are checked and confirmed to be constructed, and the situation that the integrity of the asphalt graded broken stone is damaged due to excavation after the asphalt graded broken stone is finished is avoided. (2) The pollution-proof blanket is adopted to protect a cable trough drainage ditch, a water collecting well, a contact net support and the like. (3) The known protection device is used for protecting the road base deformation observation device. (4) Rechecking the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed; (5) and after rechecking is qualified, cleaning the scum on the surface of the graded crushed stone layer.
Day 2:
(1) spreading prime coat asphalt with a spreading amount of 2.0L/m by using an asphalt spreading vehicle2(ii) a (2) Hanging a construction guide beam for controlling the elevation of the top surface of the asphalt concrete, wherein the setting height of the guide beam is in consideration of the loose paving coefficient of asphalt graded crushed stones so as to ensure that the compaction thickness of the guide beam is 7 cm; (3) and (5) closing the traffic for 24h, and fully permeating the asphalt of the permeable layer and evaporating water.
Day 3:
the production is carried out by adopting a 3000 type intermittent mixer, and the mixer is provided with 5 cold material bins and a feed inlet for adding an admixture. The heating temperature of the asphalt is 185 ℃, and the heating temperature of the aggregate is 195 ℃. And (3) dry-mixing the aggregate for 15s, adding preheated modified asphalt, limestone powder and asphalt reinforcing agent, and mixing for 40s, wherein the total mixing time is 55s, and the mixing temperature is 180 ℃. The discharging temperature is controlled according to 180-195 ℃. The asphalt graded broken stone with the discharge temperature of more than 200 ℃, white material, agglomeration and blocking, and serious segregation of coarse and fine aggregates is discarded. And mixing the asphalt graded crushed stone with the specification of AGCS-20 according to the steps.
The material transporting vehicle with the weight of more than 13t is adopted for transportation, and heat preservation, rain prevention and pollution prevention measures are adopted. When the material is loaded from the mixer to the material transporting vehicle, the vehicle position should be moved for many times to balance the loading and prevent the segregation of coarse and fine aggregates. Ensuring that the on-site temperature of the asphalt graded broken stone is not lower than 160 ℃.
Paving is carried out by adopting a full-automatic asphalt paver and an automatic leveling mode. Before construction, an ironing plate of an asphalt paver is preheated to more than 105 ℃, the temperature of asphalt graded broken stones before paving is ensured to be not lower than 160 ℃, the working point is a ballastless track section, 3 pavers are adopted for step operation, and the paving speed is preferably controlled to be 3 m/min.
Selecting a steel wheel road roller with the weight of 15t, the vibration frequency of 35Hz and the amplitude of 0.8 mm; the tyre type road roller with the total weight of 28t, the pressure of each tyre of 15.5kN, the tyre inflation pressure of 0.58MPa in a cold state and the tyre heating pressure of 0.62MPa is selected, and the air pressure of each tyre is approximately the same. The primary pressing procedure is that the steel wheel road roller is subjected to static pressure for 2 times, the rolling speed is 3km/h, and the internal temperature of the asphalt graded broken stone at the beginning of primary pressing is not lower than 155 ℃; after the initial pressing is finished, carrying out the repressing tightly, wherein the repressing process comprises the steps of vibrating and pressing for 6 times by a steel wheel road roller and the vibrating and pressing rolling speed of the steel wheel road roller is 5 km/h; compacting for 4 times by using a rubber-tyred road roller, wherein the rolling speed of the rubber-tyred road roller is 6 km/h; and the final pressing comprises 4 times of static pressure of the steel wheel road roller, the static pressure rolling speed of the steel wheel road roller is 6km/h, and the surface temperature of the asphalt graded broken stone after the final pressing is finished is not lower than 95 ℃.
After the construction is completed, all the construction machines should exit from the finished operation area on the same day. Before traffic is not opened, any vehicles are prohibited from driving in, and no heavy objects can be placed on the surface.
Day 4:
(1) after the surface temperature of the AGCS-20 asphalt graded broken stone is lower than 50 ℃, uniformly spraying 0.6L/m of bond coat asphalt on the surface of the AGCS-20 asphalt graded broken stone by utilizing an asphalt spraying vehicle2(ii) a (2) Hanging a construction guide beam for controlling the elevation of the top surface of the asphalt concrete, wherein the setting height of the guide beam is in consideration of the loose paving coefficient of asphalt graded crushed stones so as to ensure that the compaction thickness of the guide beam is 8 cm;
the work on day 3 of the example was repeated and a mix, transport, paving and compaction of AGCS-16 asphalt graded macadam was performed.
After the construction is completed, all the construction machines should exit from the finished operation area on the same day. Before traffic is not opened, any vehicles are prohibited from driving in, and no heavy objects can be placed on the surface.
Day 5:
and after the spreading layer of the asphalt concrete is completely and naturally cooled and the surface temperature of the asphalt concrete is lower than 50 ℃, the traffic can be opened.
Through detection, the compactness of the asphalt graded broken stone in the construction section of the construction site is 99.8%, the water permeability coefficient is 0mL/min, and the void ratio is 2.12%, which indicates that the asphalt graded broken stone meets the requirements of the designed void ratio (less than 4%) and the target compactness (more than 98%), and has good waterproof performance (the water permeability coefficient is less than or equal to 60 mL/min).
Claims (10)
1. A construction method of a high-speed railway asphalt graded crushed stone foundation bed comprises the following steps:
(1) preparation for construction
Rechecking the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed to ensure that the top surface elevation, the geometric dimension and the quality of the graded crushed stone on the surface layer of the foundation bed meet the regulations in the design Specifications for railway subgrades TB10001 and the design Specifications for high-speed railways TB 10621; then, hanging a construction lead or a guide beam for controlling the elevation of the top surface of the asphalt graded crushed stone;
(2) spreading of permeable asphalt and/or adhesive layer asphalt
When the design thickness of the asphalt graded broken stone is less than or equal to 10cm, designing, paving and compacting according to a layer of asphalt graded broken stone layer;
when the design thickness of the asphalt graded broken stone is more than 10cm, the asphalt graded broken stone is designed in a layered mode and paved and compacted in a layered mode;
distributing permeable asphalt between the graded crushed stone layer and the asphalt graded crushed stone layer on the surface layer of the foundation bed, and distributing adhesive layer asphalt between the asphalt graded crushed stone layers;
(3) mixing of asphalt graded crushed stone
Controlling the heating temperature of the asphalt to be 160-190 ℃, wherein the heating temperature of the aggregate is 10-30 ℃ higher than that of the asphalt; mixing the heated asphalt, the heated aggregate, the limestone powder and the asphalt reinforcing agent by using an intermittent mixer to form asphalt graded broken stone, and controlling the discharge temperature of the asphalt graded broken stone to be 170-195 ℃;
(4) transportation of asphalt graded crushed stone
A material transporting vehicle with the load of more than 12 tons is adopted to transport asphalt graded broken stones, and balanced loading is carried out when the material transporting vehicle is loaded from a mixer, so as to prevent coarse aggregate and fine aggregate from being separated;
(5) paving of asphalt graded broken stone
Paving by using a full-automatic asphalt paver, and preheating a screed plate of the paver to be more than 100 ℃ before paving; the temperature of the asphalt graded broken stone before paving is not lower than 160 ℃;
(6) compaction of asphalt graded macadam
Compacting by adopting initial pressure, re-pressure and final pressure according to a mode of combining a steel wheel road roller and a tire type road roller;
(7) maintenance of asphalt graded crushed stone
And after the spreading layer of the asphalt graded broken stone is completely and naturally cooled and the surface temperature of the asphalt graded broken stone is lower than 50 ℃, the traffic can be opened.
2. The method of claim 1, wherein the construction preparation in step (1) further comprises ensuring the following construction conditions: the construction is not carried out under the conditions of strong wind and rain with the temperature lower than 10 ℃, 5 grades and above.
3. The method according to claim 1, wherein the amount of the spread of the asphalt for tack coat in the step (2) is 0.3 to 0.6L/m2；
Preferably, the spreading amount of the permeable asphalt in the step (2) is 0.7-2.0L/m2；
Preferably, after the permeable asphalt in the step (2) is spread, the traffic is closed, and after the permeable asphalt is fully permeated and the moisture is evaporated, the asphalt graded broken stone is paved within 48 hours;
preferably, the sticky layer asphalt in the step (2) is sprayed on the day of paving the asphalt graded broken stone, and after the sticky layer asphalt is demulsified and the water evaporation is finished, the paving of the asphalt graded broken stone is followed;
preferably, when the asphalt graded broken stone in the step (2) is designed according to one layer, the asphalt graded broken stone with the specification of AGCS-16 is selected; when the asphalt graded broken stones in the step (2) are designed in a layered mode, the first layer is the asphalt graded broken stones with the specification of AGCS-16 from top to bottom, and the other layers are the asphalt graded broken stones with the specification of AGCS-20 or AGCS-25 respectively and independently.
4. The method as claimed in claim 1, wherein the production cycle per disc of the batch mixer in the step (3) is not less than 45s, and the dry mixing time is not less than 10 s.
5. The method as claimed in claim 1, wherein the spreading speed of the spreading machine in the step (5) is controlled to be 1-3 m/min.
6. The method according to claim 1, wherein the total mass of the steel-wheel road roller in the step (6) is not less than 12t, the vibration frequency is 35-50 Hz, and the amplitude is 0.3-0.8 mm;
preferably, the total mass of the tyre-type road roller in the step (6) is not less than 25t, the pressure of each tyre is not less than 15kN, the inflation pressure of the tyre in a cold state is not less than 0.55MPa, the air pressure of the heated tyre is not less than 0.6MPa, and the air pressure of each tyre is approximately the same.
7. The method according to claim 1, wherein the primary pressing in the step (6) comprises static pressing of a steel wheel roller for 2-4 times, and the internal temperature of the asphalt graded broken stone at the beginning of the primary pressing is not lower than 150 ℃; and the static pressure rolling speed of the steel wheel road roller is 2-3 km/h.
8. The method of claim 1, wherein the re-compacting in step (6) comprises 4-6 times of steel wheel roller compaction and 4-8 times of tire roller compaction; the vibration and compression rolling speed of the steel wheel road roller is 3-5 km/h; the rolling speed of the rubber-tyred road roller is 3-6 km/h; the repressing is carried out closely after the initial pressure is finished.
9. The method of claim 1, wherein the final compaction in step (6) comprises hydrostatic pressing of the steel-wheel roller for 2-4 times; the static pressure rolling speed of the steel wheel road roller is 3-6 km/h; the surface temperature of the asphalt graded crushed stone after the final pressure is finished is not lower than 90 ℃.
10. A high speed railway asphalt graded crushed stone foundation bed prepared by the method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010169953.6A CN111778780A (en) | 2020-03-12 | 2020-03-12 | Asphalt graded broken stone foundation bed for high-speed railway and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010169953.6A CN111778780A (en) | 2020-03-12 | 2020-03-12 | Asphalt graded broken stone foundation bed for high-speed railway and construction method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111778780A true CN111778780A (en) | 2020-10-16 |
Family
ID=72753259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010169953.6A Pending CN111778780A (en) | 2020-03-12 | 2020-03-12 | Asphalt graded broken stone foundation bed for high-speed railway and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111778780A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2204385T3 (en) * | 1999-03-19 | 2004-05-01 | Gsg Knape Gleissanierung Gmbh | PROCEDURE TO BUILD A FIRST BEARING BANKING FOR RAILWAY VEHICLES. |
| CN100999890A (en) * | 2006-12-30 | 2007-07-18 | 马银华 | Road surface structure of felexiable fibre emulsifying asphalt stable material as base and construction method thereof |
| CN102071613A (en) * | 2011-01-26 | 2011-05-25 | 中交第二公路工程局有限公司 | Asphalt-treated permeable-base (ATB) construction process |
| CN203960703U (en) * | 2014-07-15 | 2014-11-26 | 济南市市政工程设计研究院（集团）有限责任公司 | A kind of asphalt pavements with flexible bases |
| CN107558309A (en) * | 2017-09-26 | 2018-01-09 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
-
2020
- 2020-03-12 CN CN202010169953.6A patent/CN111778780A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2204385T3 (en) * | 1999-03-19 | 2004-05-01 | Gsg Knape Gleissanierung Gmbh | PROCEDURE TO BUILD A FIRST BEARING BANKING FOR RAILWAY VEHICLES. |
| CN100999890A (en) * | 2006-12-30 | 2007-07-18 | 马银华 | Road surface structure of felexiable fibre emulsifying asphalt stable material as base and construction method thereof |
| CN102071613A (en) * | 2011-01-26 | 2011-05-25 | 中交第二公路工程局有限公司 | Asphalt-treated permeable-base (ATB) construction process |
| CN203960703U (en) * | 2014-07-15 | 2014-11-26 | 济南市市政工程设计研究院（集团）有限责任公司 | A kind of asphalt pavements with flexible bases |
| CN107558309A (en) * | 2017-09-26 | 2018-01-09 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111485468B (en) | Premixed foam asphalt base layer and subbase layer in-situ cold regeneration construction method | |
| CN111304991A (en) | Hot plant mix recycling maintenance method for drainage asphalt pavement | |
| CN111440456A (en) | SBS rubber powder modified asphalt, preparation method and pavement construction method thereof | |
| CN113089470A (en) | Bridge deck high-toughness ultrathin wearing layer and construction method thereof | |
| CN114163187A (en) | Emulsified asphalt plant-mixed cold-recycling mixture and construction process thereof | |
| CN102493316A (en) | Production method of plant-mixed cold recycling foamed asphalt concrete | |
| CN107386028A (en) | Road three-hybrid system cold in place recycling engineering method | |
| KR100982233B1 (en) | Water permeable polymer road pavement having increased moisture content and durability and method for constructing the pavement | |
| CN113235349A (en) | Large-particle-size asphalt concrete construction process | |
| CN112239981A (en) | Asphalt laying process for road construction | |
| CN213625024U (en) | Cold regeneration road surface structure of emulsified asphalt | |
| CN108570897A (en) | A kind of paving method of pavement of road base | |
| CN112301826B (en) | Emulsified asphalt cold-recycling pavement structure and rapid curing method for pavement | |
| CN211472012U (en) | Signal lamp crossing filling type composite pavement | |
| CN102219442A (en) | Diatomite modified asphalt mixture pavement and construction process thereof | |
| CN112707682A (en) | Long-life terrace process for household garbage transfer station | |
| CN111778780A (en) | Asphalt graded broken stone foundation bed for high-speed railway and construction method thereof | |
| CN110016847B (en) | Foamed asphalt cold-recycling pavement structure and construction process thereof | |
| CN114016430B (en) | Asphalt concrete bridge deck pavement method | |
| CN111719371A (en) | Road base layer component and road paving method | |
| CN211171471U (en) | High-performance steel slag pavement | |
| CN110438861B (en) | Double-color asphalt pavement structure and construction process thereof | |
| CN113651560A (en) | Fine-grained thin-layer overlay asphalt mixture | |
| CN113756148A (en) | Construction method of pouring type composite pavement | |
| CN113250010A (en) | Large-particle-size asphalt macadam flexible ballast bed and construction method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201016 |
|
| RJ01 | Rejection of invention patent application after publication |