CN114561837B - Pouring method with semi-flexible asphalt concrete as track lap joint material - Google Patents
Pouring method with semi-flexible asphalt concrete as track lap joint material Download PDFInfo
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- CN114561837B CN114561837B CN202210203338.1A CN202210203338A CN114561837B CN 114561837 B CN114561837 B CN 114561837B CN 202210203338 A CN202210203338 A CN 202210203338A CN 114561837 B CN114561837 B CN 114561837B
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- Prior art keywords
- semi
- asphalt concrete
- track
- flexible
- flexible asphalt
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B21/00—Track superstructure adapted for tramways in paved streets
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B21/00—Track superstructure adapted for tramways in paved streets
- E01B21/04—Special fastenings, joint constructions, or tie-rods
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
- E01B29/005—Making of concrete parts of the track in situ
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2201/00—Fastening or restraining methods
- E01B2201/08—Fastening or restraining methods by plastic or elastic deformation of fastener
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/10—Making longitudinal or transverse sleepers or slabs in situ or embedding them
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a pouring method taking semi-flexible asphalt concrete as a track lap joint material; firstly, pasting damping strips on the side surface of the steel rail contacted with the semi-flexible asphalt concrete filling layer and the inner side wall of the track groove contacted with the semi-flexible asphalt concrete filling layer; after the steel rail is paved, arranging a plurality of steel bars at the positions of two sides of the steel rail on the ballast bed; the lower parts of the steel bars are buried into the ballast bed, and the upper parts of the steel bars are positioned in the semi-flexible asphalt concrete filling layer; preparing a matrix asphalt mixture, and stirring at 150-160 ℃; paving the prepared matrix asphalt mixture along two sides of the steel rail in a track groove; preparing cement mortar according to the mass ratio of the mortar; and (3) after the parent asphalt mixture is cooled to below 50 ℃, grouting cement mortar into the track groove to form a semi-flexible asphalt concrete filling layer. The application of the invention can prolong the service life of the whole road surface of the track, enhance the structural stability of the road surface and further improve the travelling comfort and safety.
Description
Technical Field
The invention relates to the technical field of tramcar track construction, in particular to a pouring method taking semi-flexible asphalt concrete as a track lap joint material.
Background
The modern tram just enters the recovery state at present, the structural form and the design index of the track refer to the structural form of a subway, a light rail or a high-speed railway, and the strength storage of the whole track bed is sufficient and the damage phenomenon caused by insufficient structural bearing capacity is not outstanding because the tram has lighter load and slower running speed. Tram is as the component part of urban mixed traffic, for linking with urban road, adopts asphalt concrete to mat formation to the rail face of whole railway roadbed often, and the main damage problem that influences tram track structure performance concentrates in the track asphalt pavement junction position.
The tramcar track structure widely applied in the prior art is a buried ballastless track and is mostly provided with groove-shaped steel rails. The embedded ballastless track has the advantages that all track structures are embedded below the road pavement, and the track tops are flush with the road surface, so that the requirement of the common road right of road traffic can be met. However, the track structure in this case is not only required to bear dynamic and static loads brought by electric vehicles, but also is required to bear the loads of other social vehicles on the road surface frequently, and the track road surface is extremely prone to fatigue under the action of multiple factors.
The damage of the joint not only aggravates the damage of asphalt pavement and rails, but also the residue which is damaged and fallen off can possibly enter the rail groove, so that the derailment risk of the tramcar is greatly increased, and the safe operation of the tramcar is seriously influenced.
The problems with track pavements come mainly from the following aspects:
(1) Joint material stiffness: according to the design and construction experience of the existing tramcar, the filling of the flexible material can play a role in vibration reduction and noise reduction, but the defects such as weak strength, insufficient driving load bearing capacity and the like are also caused.
Meanwhile, the rigid material has no elasticity, is sensitive to micro deformation and temperature deformation of the road surface caused by uneven settlement of the foundation, and is easy to generate cracks and water leakage. Unsuitable bonding filling materials often reduce the service life of the rail bonded road surface, improve the maintenance difficulty, and also can cause potential safety hazards. And the common asphalt has larger difference between the elastic modulus and the strength of the steel rail, and under the action of the load of the train and the ground travelling crane, the rigidity difference of the common asphalt and the steel rail can cause different deformation, so that the joint part is separated and the asphalt layer cracks, and further the asphalt layer is loosened and peeled.
(2) The structural design is not suitable: the geometric design of the road ballast bed structure and the road surface structure directly influences the mechanical response of the overlap joint structure-main road interface, the overlap joint structure-secondary main road interface and the overlap joint structure-rail road interface, and the unsuitable structural design not only can influence the construction and paving of filling materials, but also can cause unstable structure of the overlap joint, and the junction is easy to damage, so that the stability of the whole road surface is influenced.
(3) Road surface dynamic and static load action: when the electric car passes through the track, a certain dynamic load and a certain static load are generated on the track subgrade, and when the total load exceeds the bearing range of the track subgrade, the filling materials at the embankment and the joint are loose, and the filling materials on the track surface can be compacted, so that the problem of settlement of the track pavement is generated.
Therefore, how to improve the service life of the whole road surface of the track, and to enhance the structural stability of the road surface, and further to improve the travelling comfort and the safety becomes a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a pouring method using semi-flexible asphalt concrete as a track lap joint material, which aims to improve the service life of the whole road surface of the track, enhance the structural stability of the road surface, and further improve the driving comfort and safety.
In order to achieve the above purpose, the invention discloses a pouring method by taking semi-flexible asphalt concrete as a track lap joint material; the method comprises the following steps:
step 1, before steel rails are paved in track grooves of a pavement, pasting damping strips on the side surfaces of two sides of each steel rail, which are contacted with a semi-flexible asphalt concrete filling layer, and the inner side walls of each track groove, which are contacted with the semi-flexible asphalt concrete filling layer;
step 2, after all the steel rails are paved, arranging a plurality of steel bars on the ballast bed paved with each steel rail respectively at positions corresponding to the two sides of the corresponding steel rail;
the lower part of each reinforcing steel bar is embedded into the ballast bed, and the upper part of each reinforcing steel bar is positioned in the corresponding semi-flexible asphalt concrete filling layer;
step 3, preparing a matrix asphalt mixture, and stirring at 150-160 ℃;
step 4, paving the prepared matrix asphalt mixture in the track grooves along the two sides of each steel rail; when paving, paving by adopting a hot-mix hot-paving rolling forming mode by adopting a small steel wheel road roller;
step 5, mixing the mortar according to the mass ratio, adding water, and stirring until the mortar is uniform and consistent, thus preparing cement mortar;
and 6, cooling the parent asphalt mixture after the paving is completed to below 50 ℃, grouting the cement mortar in the track groove, and forming the corresponding semi-flexible asphalt concrete filling layers on the two sides of the corresponding steel rail.
Preferably, each damping strip is made of a high polymer material, the surface of each damping strip is provided with an irregular concave-convex surface, and the damping strips are wedged with the corresponding steel rail and the corresponding inner side wall of the track groove through the irregular concave-convex surfaces.
More preferably, each of the damping strips is made of a rubber material.
Preferably, in the step 3, the target void fraction of the matrix asphalt mixture is 25% and the asphalt amount is 2.5%.
Preferably, in the step 5, the mortar is a high-performance semi-flexible pavement mortar of the family of the pebbles G30B.
Preferably, in the step 5, water is added and stirred for 2 to 3 minutes.
Preferably, the curing is performed using a plastic film when the temperature of the construction is above 30 ℃.
More preferably, the time for the health maintenance is from 2 days to 3 days.
The invention has the beneficial effects that:
the application of the invention can prolong the service life of the whole road surface of the track, enhance the structural stability of the road surface and further improve the travelling comfort and safety.
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Drawings
Fig. 1 shows a flow chart of an embodiment of the invention.
Fig. 2 shows a schematic cross-sectional structure of a rail according to an embodiment of the present invention after the rail is laid.
Detailed Description
Examples
As shown in fig. 1 and 2, a pouring method using semi-flexible asphalt concrete as a track lap joint material; the method comprises the following steps:
before the steel rails 2 are paved in the track grooves of the pavement 5, damping strips 1 are adhered to the side surfaces of the two sides of each steel rail 2, which are in contact with the semi-flexible asphalt concrete filling layer 4, and the inner side walls of the track grooves, which are in contact with the semi-flexible asphalt concrete filling layer 4;
step 2, after all the steel rails 2 are paved, a plurality of steel bars 3 are respectively arranged on the ballast bed 6 paved on each steel rail 2 at positions corresponding to the two sides of the corresponding steel rail 2;
the lower part of each steel bar 3 is embedded into the ballast bed 6, and the upper part is positioned in the corresponding semi-flexible asphalt concrete filling layer 4;
step 3, preparing a matrix asphalt mixture, and stirring at 150-160 ℃;
step 4, paving the prepared matrix asphalt mixture in the track grooves along the two sides of each steel rail 2; when paving, paving by adopting a hot-mix hot-paving rolling forming mode by adopting a small steel wheel road roller;
step 5, mixing the mortar according to the mass ratio, adding water, and stirring until the mortar is uniform and consistent, thus preparing cement mortar;
and 6, cooling the matrix asphalt mixture to be paved to below 50 ℃, grouting cement mortar into the track grooves, and forming corresponding semi-flexible asphalt concrete filling layers 4 on two sides of the corresponding steel rail 2.
The principle of the invention is as follows:
the semi-flexible concrete is used as a novel material with hardness and softness, has the advantages of good flexibility, strong crack resistance, no seam, high rigidity of cement concrete pavement, strong bearing capacity and good rut resistance, has a deflection value of only 1/5 to 1/2 of that of a common asphalt pavement, has rut resistance which is more than 10 times that of the common asphalt pavement, and has good functions of water resistance, oil resistance, acid resistance and the like, and the pavement repairing frequency is reduced due to the performances.
Because the designed void ratio of the matrix asphalt mixture for the semi-flexible asphalt concrete is far greater than that of the common medium-grain asphalt mixture and the fine-grain asphalt mixture, the penetration and the accommodation of cement mortar are facilitated. Cement mortar is filled into the matrix asphalt mixture, so that matrix pores are filled, and the compactness of the semi-flexible asphalt concrete is enhanced. Under the water or freeze thawing circulation environment, the water in the pavement is difficult to enter into the gaps of asphalt concrete, so that the phenomena of loss of adhesion force due to reduction of asphalt adhesiveness, particle falling, loosening and the like of asphalt mixture are avoided. The steel bar material at the bottom and irregular contact surfaces at two sides provide longitudinal and transverse constraint for the steel rail, so that the structure of the track system is more stable.
The damping strips adhered around the steel rail have the function of reducing the resonance amplitude of the mechanical structure. Damping can avoid the damage of the structure caused by the power reaching the limit. Vibration generated by the trolley in the running process is sequentially transmitted to the damping strips and the semi-flexible asphalt concrete at the joint part by the steel rail, the amplitude is gradually reduced in the transmission, and the differentiation of surrounding concrete materials due to hard collision can be prevented, so that the comfort and the safety of the running of the trolley are greatly improved.
In some embodiments, each damping strip 1 is made of a high polymer material, the surface of each damping strip is provided with an irregular concave-convex surface, and the damping strips are wedged with the corresponding steel rail 2 and the inner side wall of the corresponding track groove through the irregular concave-convex surfaces.
In some embodiments, each damping strip 1 is made of a rubber material.
In certain embodiments, in step 3, the masterbatch target void fraction is 25% and the asphalt is used in an amount of 2.5%.
The following table shows the 25% void fraction of the example for the following mineral and bitumen amounts:
in certain embodiments, in step 5, the mortar is a high performance semi-flexible pavement mortar of the family of the pebbles G30B.
The technical indexes should meet the following table:
the parent asphalt mixture is preferably a gap type mixer, and the mixing process ensures that the mixture is uniformly mixed and all mineral aggregate particles are not agglomerated or separated. The production period of each tray is not less than 55s (wherein the dry mixing is not less than 5-10 s), and the tray is paved at 150-160 ℃.
The grouting material is selected from high-performance semi-flexible pavement mortar of G30B in the family of the high-quality gravel, the time interval from adding water and stirring to finishing the grouting construction is within 15 minutes, so that the cement mortar is prevented from becoming less in fluidity along with the time increase, and the permeation effect of the cement mortar is further influenced. In order to assist in slurry penetration, the penetration should be assisted in time by rolling with a small vibratory roller so that the slurry can sufficiently and uniformly penetrate into the gaps of the matrix skeleton. After grouting, the redundant slurry should be scraped off rapidly so as to ensure that the semi-flexible pavement has an ideal surface structure.
In certain embodiments, in step 5, the water is added and mixed for a period of 2 minutes to 3 minutes.
In some embodiments, plastic films are used to preserve health when the construction air temperature is above 30 ℃.
When the construction temperature is below 30 ℃, a special health maintenance mode is not needed; when the temperature of the construction is 30 ℃ or higher, it is necessary to use a plastic film for curing. The life time should vary depending on the nature of the slurry, and traffic is usually released after 2-3 days.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (8)
1. The pouring method of taking semi-flexible asphalt concrete as a track lap joint material; the method is characterized by comprising the following steps of:
before steel rails (2) are paved in track grooves of a pavement (5), damping strips (1) are adhered to the side surfaces of the two sides of each steel rail (2) which are contacted with a semi-flexible asphalt concrete filling layer (4) and the inner side walls of each track groove which are contacted with the semi-flexible asphalt concrete filling layer (4);
step 2, after all the steel rails (2) are paved, arranging a plurality of steel bars (3) on the ballast bed (6) paved on each steel rail (2) at positions corresponding to two sides of the corresponding steel rail (2);
the lower part of each reinforcing steel bar (3) is embedded into the ballast bed (6), and the upper part of each reinforcing steel bar is positioned in the corresponding semi-flexible asphalt concrete filling layer (4);
step 3, preparing a matrix asphalt mixture, and stirring at 150-160 ℃;
step 4, paving the prepared matrix asphalt mixture in the track grooves along the two sides of each steel rail (2); when paving, paving by adopting a hot-mix hot-paving rolling forming mode by adopting a small steel wheel road roller;
step 5, mixing the mortar according to the mass ratio, adding water, and stirring until the mortar is uniform and consistent, thus preparing cement mortar;
and 6, cooling the parent asphalt mixture to be paved to below 50 ℃, grouting the cement mortar in the track groove, and forming the corresponding semi-flexible asphalt concrete filling layers (4) on two sides of the corresponding steel rail (2).
2. The pouring method using semi-flexible asphalt concrete as a track lap joint material according to claim 1, wherein each damping strip (1) is made of a high molecular polymer material, the surface of each damping strip is provided with an irregular concave-convex surface, and wedging is realized between the damping strip and the corresponding steel rail (2) and the corresponding inner side wall of the track groove through the irregular concave-convex surface.
3. Pouring method with semi-flexible asphalt concrete as track lap material according to claim 1, characterized in that each damping strip (1) is made of rubber material.
4. The method of casting semi-flexible asphalt concrete as a track lap joint material according to claim 1, wherein in said step 3, said target void fraction of said matrix asphalt mixture is 25% and the asphalt content is 2.5%.
5. The method of casting semi-flexible asphalt concrete as a track lap material according to claim 1, wherein in said step 5, said mortar is a high performance semi-flexible road surface mortar of the family of the schlempe G30B.
6. The method of casting semi-flexible asphalt concrete as a track lap joint material according to claim 1, wherein in said step 5, the water addition and mixing time is 2 minutes to 3 minutes.
7. The casting method using semi-flexible asphalt concrete as track lap joint material according to claim 1, wherein when the construction air temperature is above 30 ℃, a plastic film is used for curing.
8. The method for casting a semi-flexible asphalt concrete as a track lap joint material according to claim 7, wherein said curing time is 2 to 3 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210203338.1A CN114561837B (en) | 2022-03-02 | 2022-03-02 | Pouring method with semi-flexible asphalt concrete as track lap joint material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210203338.1A CN114561837B (en) | 2022-03-02 | 2022-03-02 | Pouring method with semi-flexible asphalt concrete as track lap joint material |
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| Publication Number | Publication Date |
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| CN114561837A CN114561837A (en) | 2022-05-31 |
| CN114561837B true CN114561837B (en) | 2023-09-05 |
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| CN202210203338.1A Active CN114561837B (en) | 2022-03-02 | 2022-03-02 | Pouring method with semi-flexible asphalt concrete as track lap joint material |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03146450A (en) * | 1989-10-30 | 1991-06-21 | Showa Highpolymer Co Ltd | Cement slurry composition for semiflexible pavement |
| CN105274912A (en) * | 2015-03-30 | 2016-01-27 | 北京城建设计发展集团股份有限公司 | Construction method for monolithic track bed of tramcar on hardened section |
| JP2016190766A (en) * | 2015-03-31 | 2016-11-10 | 三菱マテリアル株式会社 | Injection material for semiflexible paving and semiflexible paving |
| CN207003252U (en) * | 2017-06-27 | 2018-02-13 | 上海市市政规划设计研究院 | Permanent seal cooling Bridge Surface Paving by Cement structure |
| CN108252177A (en) * | 2018-03-19 | 2018-07-06 | 上海市城市建设设计研究总院（集团）有限公司 | Improve the ruggedized construction of tramcar trackside Asphalt Pavement Cracking |
| CN207714043U (en) * | 2017-12-15 | 2018-08-10 | 成都市新筑路桥机械股份有限公司 | The slot inner macromolecule structure that a kind of function for embedded tracks detaches |
| CN112064443A (en) * | 2020-09-21 | 2020-12-11 | 中铁四院集团新型轨道交通设计研究有限公司 | Structure for connecting asphalt pavement at tramcar level crossing with steel rail and construction method |
| CN113605169A (en) * | 2021-08-17 | 2021-11-05 | 山东沂蒙交通发展集团有限公司 | Construction method of pouring type semi-flexible composite anti-rutting pavement |
| CN113699839A (en) * | 2021-09-06 | 2021-11-26 | 上海市城市建设设计研究总院（集团）有限公司 | Urban tramcar rail side semi-flexible transition structure and construction method thereof |
-
2022
- 2022-03-02 CN CN202210203338.1A patent/CN114561837B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03146450A (en) * | 1989-10-30 | 1991-06-21 | Showa Highpolymer Co Ltd | Cement slurry composition for semiflexible pavement |
| CN105274912A (en) * | 2015-03-30 | 2016-01-27 | 北京城建设计发展集团股份有限公司 | Construction method for monolithic track bed of tramcar on hardened section |
| JP2016190766A (en) * | 2015-03-31 | 2016-11-10 | 三菱マテリアル株式会社 | Injection material for semiflexible paving and semiflexible paving |
| CN207003252U (en) * | 2017-06-27 | 2018-02-13 | 上海市市政规划设计研究院 | Permanent seal cooling Bridge Surface Paving by Cement structure |
| CN207714043U (en) * | 2017-12-15 | 2018-08-10 | 成都市新筑路桥机械股份有限公司 | The slot inner macromolecule structure that a kind of function for embedded tracks detaches |
| CN108252177A (en) * | 2018-03-19 | 2018-07-06 | 上海市城市建设设计研究总院（集团）有限公司 | Improve the ruggedized construction of tramcar trackside Asphalt Pavement Cracking |
| CN112064443A (en) * | 2020-09-21 | 2020-12-11 | 中铁四院集团新型轨道交通设计研究有限公司 | Structure for connecting asphalt pavement at tramcar level crossing with steel rail and construction method |
| CN113605169A (en) * | 2021-08-17 | 2021-11-05 | 山东沂蒙交通发展集团有限公司 | Construction method of pouring type semi-flexible composite anti-rutting pavement |
| CN113699839A (en) * | 2021-09-06 | 2021-11-26 | 上海市城市建设设计研究总院（集团）有限公司 | Urban tramcar rail side semi-flexible transition structure and construction method thereof |
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