CN114561837A - Pouring method taking semi-flexible asphalt concrete as track lapping material - Google Patents
Pouring method taking semi-flexible asphalt concrete as track lapping material Download PDFInfo
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- CN114561837A CN114561837A CN202210203338.1A CN202210203338A CN114561837A CN 114561837 A CN114561837 A CN 114561837A CN 202210203338 A CN202210203338 A CN 202210203338A CN 114561837 A CN114561837 A CN 114561837A
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- semi
- rail
- asphalt concrete
- flexible
- steel
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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
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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
- E01B29/005—Making of concrete parts of the track in situ
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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
- E01B2201/00—Fastening or restraining methods
- E01B2201/08—Fastening or restraining methods by plastic or elastic deformation of fastener
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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
- 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
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- 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 rail lapping material; firstly, adhering damping strips on the side surface of the steel rail, which is in contact with the semi-flexible asphalt concrete filling layer, and on the inner side wall of the rail groove, which is in contact with the semi-flexible asphalt concrete filling layer; after the steel rail is laid, arranging a plurality of steel bars on the two sides of the steel rail on the ballast bed; the lower parts of the reinforcing steel bars are all embedded into the ballast bed, and the upper parts of the reinforcing steel bars are all positioned in the semi-flexible asphalt concrete filling layer; preparing a parent asphalt mixture, and stirring at 150-160 ℃; paving the prepared parent asphalt mixture in a rail groove along two sides of the steel rail; mixing mortar according to the mass ratio to prepare cement mortar; and when the matrix asphalt mixture is cooled to below 50 ℃, cement mortar is grouted in 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 driving comfort and safety.
Description
Technical Field
The invention relates to the technical field of rail electric vehicle track construction, in particular to a pouring method taking semi-flexible asphalt concrete as a track lap joint material.
Background
The modern tramcar is just entering a renaming state at present, the structural form and design indexes of the track of the tramcar refer to the structural form of a subway, a light rail or a high-speed railway, and because the tramcar is light in load and low in running speed, and meanwhile, the strength of the whole track bed is sufficient, the damage phenomenon caused by insufficient bearing capacity of the structure is not prominent. The tramcar is as the component part of city mixed traffic, for linking with the urban road, whole railway roadbed to rail face often adopt asphalt concrete to mat formation, and the main damage problem that influences tramcar track structure performance concentrates on track pitch and paves the joint position.
The rail tramcar track structure widely applied in the prior art is an embedded ballastless track and mostly adopts a groove-shaped steel rail. The embedded ballastless track buries all track structures under the pavement of the road, and the track top is flush with the road surface, so that the requirement of the road right sharing of road traffic can be met. However, the track structure in this case is not only required to bear the dynamic and static loads brought by the electric car, but also required to frequently bear the loads of other social vehicles on the road surface, and the track road surface is easily fatigued under the action of multiple factors.
The damage of the joint part aggravates the asphalt pavement and the damage of the track, and the damaged and fallen residues can enter the rail groove, so that the derailing risk of the tramcar is greatly increased, and the safe operation of the tramcar is seriously influenced.
The problems of the track pavement mainly come from the following aspects:
(1) material stiffness at the joint: 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 has the defects of weak strength, insufficient load bearing capacity of the train and the like.
Meanwhile, the rigid material is not flexible, so that the rigid material is sensitive to tiny deformation of a road surface and temperature deformation caused by uneven settlement of a foundation, and is easy to generate cracks and water leakage. Improper combination filling material often can reduce the life that the track combines the road surface, improves the maintenance degree of difficulty, still can cause the potential safety hazard. And the problem that the elastic modulus of the common asphalt is greatly different from the strength of the steel rail is that the deformation is different due to the rigidity difference of the common asphalt and the steel rail under the action of train and ground running loads, so that the phenomena of the falling of a joint part and the cracking of an asphalt layer are caused, and the phenomena of the loosening and the falling of the asphalt layer are further caused.
(2) The structural design is not suitable: the mechanical response of the lap joint structure-main road interface, the lap joint structure-secondary main road interface and the lap joint structure-track road interface is directly influenced by the geometric design of the pavement ballast bed structure and the pavement structure and the lap joint structure, the construction and the laying of filling materials are influenced by improper structural design, the structure of the lap joint part is unstable, and the boundary part is easy to damage, so that the whole pavement stability is influenced.
(3) The dynamic and static load action of the road surface: when the electric car passes through the track, the track subgrade generates certain dynamic load and static load, and when the total load exceeds the bearing range of the track subgrade and the fillers at the embankment and the joint are loose, the pavement fillers are compacted to generate the problem of track pavement settlement.
Therefore, how to improve the service life of the whole track pavement and enhance the structural stability of the pavement, and further improve the driving comfort and safety becomes a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In view of the above defects in the prior art, the invention provides a pouring method using semi-flexible asphalt concrete as a rail overlapping material, which aims to prolong the service life of the whole pavement of a rail, enhance the structural stability of the pavement and further improve the driving comfort and safety.
In order to achieve the purpose, the invention discloses a pouring method taking semi-flexible asphalt concrete as a rail overlapping material; the method comprises the following steps:
step 1, before steel rails are laid in track grooves of a road surface, damping strips are pasted on the side surfaces of two sides of each steel rail, which are in contact with a semi-flexible asphalt concrete filling layer, and the inner side walls of the track grooves, which are in contact with the semi-flexible asphalt concrete filling layer;
step 2, after all the steel rails are laid, respectively arranging a plurality of steel bars on the positions corresponding to the two sides of each steel rail on the track bed on which each steel rail is laid;
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 parent asphalt mixture, and stirring at 150-160 ℃;
step 4, paving the prepared parent asphalt mixture in the rail grooves along two sides of each steel rail; when in paving, a small steel wheel road roller is adopted for paving in a hot-mixing hot-paving rolling forming mode;
and 6, cooling the matrix asphalt mixture to be paved to below 50 ℃, grouting the cement mortar in the track groove, and forming corresponding semi-flexible asphalt concrete filling layers on 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 rail groove through the irregular concave-convex surfaces.
More preferably, each damping strip is made of a rubber material.
Preferably, in the step 3, the target void ratio of the parent asphalt mixture is 25%, and the asphalt dosage is 2.5%.
Preferably, in the step 5, the mortar is the Clomidae G30B high-performance semi-flexible pavement mortar.
Preferably, in the step 5, water is added and the mixing time is 2 to 3 minutes.
Preferably, when the temperature of construction is above 30 ℃, plastic films are used for curing.
More preferably, the curing time is 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 track pavement, enhance the stability of the pavement structure and further improve the driving comfort and safety.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 shows a flow chart of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of a finished rail in an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1 and fig. 2, a pouring method using semi-flexible asphalt concrete as a rail overlapping material; the method comprises the following steps:
step 1, before steel rails 2 are laid in track grooves of a road surface 5, damping strips 1 are pasted on the side surfaces of two sides of each steel rail 2, which are in contact with a 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 laid, a plurality of steel bars 3 are respectively arranged at positions corresponding to two sides of each steel rail 2 on a track bed 6 on which each steel rail 2 is laid;
the lower part of each steel bar 3 is embedded into the ballast bed 6, and the upper part of each steel bar is positioned in the corresponding semi-flexible asphalt concrete filling layer 4;
step 3, preparing a parent asphalt mixture, and stirring at 150-160 ℃;
step 4, paving the prepared parent asphalt mixture in the rail groove along two sides of each steel rail 2; when in paving, a small steel wheel road roller is adopted for paving in a hot-mixing hot-paving rolling forming mode;
and 6, cooling the parent asphalt mixture to be paved to below 50 ℃, grouting cement mortar in the track groove, 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 as a novel material with rigidity and flexibility has the advantages of good flexibility, strong crack resistance, no joint, high rigidity of a cement concrete pavement, strong bearing capacity and good anti-rutting performance, the deflection value of the semi-flexible concrete is only 1/5-1/2 of that of a common asphalt pavement, the anti-rutting capacity is more than 10 times of that of the common asphalt pavement, and the semi-flexible concrete also has good functions of water resistance, oil resistance, acid resistance and the like, and the frequency of pavement repair is reduced due to the performances.
The design porosity of the parent asphalt mixture for semi-flexible asphalt concrete is far greater than that of the commonly used medium-grain and fine-grain asphalt mixtures, so that the permeation and the accommodation of cement mortar are facilitated. The cement mortar is poured into the matrix asphalt mixture to fill the matrix pores, so that the compactness of the semi-flexible asphalt concrete is enhanced. Under the environment of water or freeze-thaw cycle, water in the asphalt pavement is difficult to enter gaps of asphalt concrete, and the phenomena of asphalt adhesion reduction, loss of cohesive force, asphalt mixture particle falling, loosening and the like are avoided. The steel bar material and the irregular contact surface on the two sides of the bottom provide longitudinal and transverse restraint for the steel rail, so that the track system structure 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 structure to cause destruction because of power reaches the limit. The vibrations that the trolley-bus produced in the operation process are transmitted to damping strip, joint portion semi-flexible asphalt concrete by the rail in proper order, and the amplitude reduces gradually in the transmission, can prevent that peripheral concrete material from differentiating because of rigid collision, and this comfort level and the security that has improved the vehicle greatly and has gone.
In some embodiments, each damping strip 1 is made of a high polymer material, and the surface of each damping strip is provided with an irregular concave-convex surface, so that the damping strip is wedged with the inner side wall of the corresponding steel rail 2 and the corresponding rail groove through the irregular concave-convex surface.
In some embodiments, each damping strip 1 is made of a rubber material.
In certain embodiments, in step 3, the target porosity of the parent asphalt mixture is 25% and the amount of asphalt is 2.5%.
The following table shows the amount of mineral aggregate and bitumen at 25% void:
in certain embodiments, in step 5, the mortar is a boulder G30B high performance semi-flexible pavement mortar.
The technical indexes should meet the following table:
the matrix asphalt mixture is preferably a gap type mixer, and the mixture is uniformly mixed in the mixing process, and all mineral aggregate particles are free from agglomeration and blocking or coarse and fine material separation. The production period of each plate is not less than 55s (wherein the dry mixing time is not less than 5-10s), and the plates are spread at the temperature of 150 ℃ and 160 ℃.
The grouting material is high-performance semi-flexible pavement mortar of G30B of family Clomidae, and the time interval from the preparation of the grouting material by adding water to the completion of the grouting construction is within 15min, so as to avoid the fluidity of the cement mortar from being reduced along with the increase of time, thereby influencing the permeation effect of the cement mortar. In order to assist the penetration of the slurry, a small vibratory roller is adopted to roll and press the slurry in time to assist the penetration, so that the slurry can fully and uniformly penetrate into gaps of the matrix framework. After grouting, the redundant slurry should be quickly scraped off to ensure that the semi-flexible pavement has an ideal surface structure.
In certain embodiments, in step 5, water is added and mixed for a time of 2 minutes to 3 minutes.
In some embodiments, plastic films are used for curing when the temperature of construction is above 30 ℃.
When the temperature of construction is below 30 ℃, a special curing mode is not needed; when the temperature of construction is 30 ℃ or higher, it is necessary to use a plastic film for curing. The curing time should be different according to the nature of the slurry, and the traffic can be opened after 2-3 days.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A pouring method using semi-flexible asphalt concrete as a rail lap joint material; the method is characterized by comprising the following steps:
step 1, before steel rails (2) are laid in track grooves of a road surface (5), damping strips (1) are pasted on the side surfaces of two sides of each steel rail (2) which are in contact with a 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 laid, a plurality of steel bars (3) are respectively arranged on the positions, corresponding to the two sides of each steel rail (2), of the upper surface of a track bed (6) on which each steel rail (2) is laid;
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 parent asphalt mixture, and stirring at 150-160 ℃;
step 4, paving the prepared parent asphalt mixture in the rail groove along two sides of each steel rail (2); when in paving, a small steel wheel road roller is adopted for paving in a hot-mixing hot-paving rolling forming mode;
step 5, proportioning the mortar according to the mass, adding water, stirring 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 the cement mortar in the track grooves, and forming the corresponding semi-flexible asphalt concrete filling layers (4) on two sides of the corresponding steel rail (2).
2. The pouring method for the semi-flexible asphalt concrete used as the rail lapping material according to claim 1, wherein 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 rail groove through the irregular concave-convex surfaces.
3. The method for pouring the semi-flexible asphalt concrete as the rail lap material according to claim 1, wherein each damping strip (1) is made of a rubber material.
4. The method for pouring the semi-flexible asphalt concrete as the rail lap material according to claim 1, wherein in the step 3, the target void ratio of the parent asphalt mixture is 25%, and the asphalt dosage is 2.5%.
5. The method for casting the track lap with the semi-flexible asphalt concrete as the rail lap material of claim 1, wherein in the step 5, the mortar is the breccidae G30B high-performance semi-flexible pavement mortar.
6. The method for casting the semi-flexible asphalt concrete as the rail lap material according to claim 1, wherein in the step 5, the water is added and mixed for 2 to 3 minutes.
7. The method for pouring the semi-flexible asphalt concrete as the rail lap joint material according to claim 1, wherein when the temperature of construction is above 30 ℃, the plastic film is used for curing.
8. The method for pouring the semi-flexible asphalt concrete as the rail lap material of claim 7, wherein the 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 |
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| 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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| CN114561837A true CN114561837A (en) | 2022-05-31 |
| CN114561837B CN114561837B (en) | 2023-09-05 |
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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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