CN113699839A - Urban tramcar rail side semi-flexible transition structure and construction method thereof - Google Patents
Urban tramcar rail side semi-flexible transition structure and construction method thereof Download PDFInfo
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- CN113699839A CN113699839A CN202111037390.6A CN202111037390A CN113699839A CN 113699839 A CN113699839 A CN 113699839A CN 202111037390 A CN202111037390 A CN 202111037390A CN 113699839 A CN113699839 A CN 113699839A
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- 230000007704 transition Effects 0.000 title claims abstract description 56
- 238000010276 construction Methods 0.000 title claims abstract description 29
- 239000011384 asphalt concrete Substances 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 239000000565 sealant Substances 0.000 claims abstract description 33
- 239000010426 asphalt Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000000853 adhesive Substances 0.000 claims abstract description 13
- 230000001070 adhesive effect Effects 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 239000002131 composite material Substances 0.000 claims abstract description 7
- 229920000642 polymer Polymers 0.000 claims abstract description 7
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 229920001875 Ebonite Polymers 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 229920006332 epoxy adhesive Polymers 0.000 claims description 3
- 239000012812 sealant material Substances 0.000 claims description 3
- 150000004756 silanes Chemical class 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 2
- 239000002861 polymer material Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 7
- 230000000087 stabilizing effect Effects 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 25
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
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
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/12—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for distributing granular or liquid materials
- E01C19/18—Devices for distributing road-metals mixed with binders, e.g. cement, bitumen, without consolidating or ironing effect
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/06—Pavings adjacent tramways rails ; Pavings comprising railway tracks
Abstract
The invention discloses a semi-flexible transition structure at the rail side of an urban tramcar and a construction method thereof.A semi-flexible transition layer is arranged on asphalt concrete pavement and rail top sealant; the semi-flexible transition layer is made of a polymer composite material, and after the semi-flexible transition layer is hardened, the rigidity of the semi-flexible transition layer is between asphalt concrete pavement and rail top sealant; the method comprises the following steps: 1. erecting a steel rail, and installing a steel rail flexible package through an adhesive; 2. pouring a reinforced concrete road bed board, and embedding asphalt to lay a guard plate; 3. paving asphalt concrete according to the road construction requirement; 4. constructing the rail top sealant after the asphalt concrete pavement construction is completed and the strength is reached; 5. and cutting to remove the horizontal asphalt laying guard plate, heating a semi-flexible transition layer material by adopting a movable mixing machine, discharging and pouring after reaching a preset temperature, and forming the semi-flexible transition layer after cooling and stabilizing. The invention solves the problems of cracking and damage of the asphalt concrete at the steel rail side of the embedded type monolithic roadbed by improving the cohesiveness and rigidity transition of the asphalt concrete and the rail top sealing layer.
Description
Technical Field
The invention relates to the technical field of tramcar track construction, in particular to a semi-flexible transition structure on the track side of an urban tramcar and a construction method thereof.
Background
The urban tramcar as an urban rail transit system with medium traffic volume has become an important component of urban public transit systems in China. According to incomplete statistics, more than 15 cities are opened and operated, more than 20 cities are built, and about 90 cities are planned and built with tramcar lines in China. Because the operation time is long, the maintenance and repair can only use the night outage time, and the maintenance and repair is mainly in the form of a ground line, the tramcar main line in the city of China generally adopts an embedded integral ballast bed. For mixed roads or level crossings of ground lines, the embedded integral ballast bed needs to be paved by asphalt concrete in combination with municipal roads. However, at the joint of the steel rail and the asphalt concrete, as the asphalt aggregate and the steel rail are wrapped by partially flexible materials, the asphalt concrete on the side of the steel rail is not compact enough, and the phenomena of cracking and breakage generally occur under the combined action of a plurality of adverse factors such as transverse impact generated by social vehicle braking, fatigue damage caused by steel rail vibration, uneven deformation of the steel rail flexible wrapping material when being pressed and the like, and the cracking and breakage width is more than 5cm on average. The protection of the asphalt concrete layer is lost on the outer side of the track and the wrapping material, the disease is aggravated and developed, and the driving safety and the comfort of the tramcar are seriously influenced.
Therefore, aiming at the above engineering characteristics and difficult problems of the urban tramcar, a simple, effective, reliable-quality, economic and reasonable structural form is provided to prevent the embedded integral ballast bed steel rail side asphalt concrete from cracking, which is a difficult problem to be solved urgently in the industry at present.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a semi-flexible transition structure on the rail side of an urban tramcar and a construction method thereof, and aims to solve the difficult problems of cracking and breakage of asphalt concrete on the rail side of an embedded monolithic track bed of a mixed road or a level crossing of a ground line of the urban tramcar by improving the cohesiveness and the rigidity transition of the asphalt concrete and a rail top sealing layer.
In order to achieve the purpose, the invention discloses a semi-flexible transition structure at the rail side of an urban tramcar, which comprises a steel rail; the middle part and the lower part of the steel rail are provided with steel rail flexible packages through adhesives; two sides of the steel rail are close to the upper part, and rail top sealant is arranged above the flexible steel rail package; and a reinforced concrete track bed plate and asphalt concrete pavement are sequentially arranged on the outer side of the steel rail from bottom to top.
Wherein the asphalt concrete pavement and the rail top sealant are provided with semi-flexible transition layers;
the semi-flexible transition layer is made of a polymer composite material, and after the semi-flexible transition layer is hardened, the rigidity of the semi-flexible transition layer is between the asphalt concrete pavement and the rail top sealant;
and a groove used for filling the semi-flexible transition layer is formed in the upper surface of the asphalt concrete pavement, which is close to the position of the rail top sealant.
Preferably, the cross section of the groove is stepped, and the depth of the part close to the rail top sealant is larger than the depth of the part far away from the rail top sealant.
More preferably, the depth 2a of the stepped groove close to one side of the rail top sealant (7) is more than or equal to 40mm, and the depth of the stepped groove close to the other side is a;
the width of recess is 2b, and is relevant with whole heating and cooling, urban road grade, asphalt concrete compactness when asphalt concrete lays, and the computational formula is as follows:
b≥(η1η2η3be)n×10
wherein, beTaking the width of a semi-flexible transition layer base as 50 mm;
η1delta temperature of integral heating and cooling in combination with asphalt concrete laying for temperature coefficientT；T0The temperature when asphalt concrete is laid; t iseThe maximum/minimum effective temperature standard value of the project location can be calculated according to the average maximum/minimum temperature T of the local day when no relevant technical requirements existtCorrecting consideration considering extreme temperature influence;
η2dividing the road grade coefficient into a fast road, a main road, a secondary main road and a branch road by combining with relevant design specifications of urban road engineering;
η3the density coefficient of the asphalt concrete is 1.0-1.1 according to the density from large to small by combining with relevant standards of construction of asphalt pavement of a highway.
Preferably, the bottom of the groove is provided with an asphalt laying protection plate.
More preferably, the asphalt laying protection plate is hard rubber, and the thickness of the asphalt laying protection plate is not less than that of the road fine-grained asphalt concrete layer.
Preferably, the semi-flexible transition layer is a composite high polymer material which comprises three components, is subjected to thermal construction and can be formed in a pouring mode; the first component is homologous with the rail top sealant material, the second component is homologous with the asphalt material, and the third component is the adhesive material of the two components.
Preferably, the steel rail is flexibly wrapped by high polymer foaming material or rubber.
Preferably, the adhesive is a modified silane or epoxy adhesive.
The invention also provides a construction method of the semi-flexible transition structure at the rail side of the urban tramcar, which comprises the following steps:
step 4, constructing a rail top sealant after the asphalt concrete pavement construction is finished and the strength is reached;
and 5, cutting to remove the horizontal asphalt laying guard plate, heating a semi-flexible transition layer material by adopting a movable mixer, discharging and pouring after the temperature reaches a preset temperature, and forming the semi-flexible transition layer after cooling and stabilizing.
The invention has the beneficial effects that:
the invention adopts a semi-flexible transition layer structure, has good bearing capacity and flexibility, and has excellent fatigue damage resistance and chemical stability.
Because the material is homologous with the rail top sealant and the asphalt, the high temperature, the rail top sealant and the asphalt concrete can be utilized to form good boundary fusion in the construction process, and the risk of boundary bonding failure is greatly reduced.
The construction process can be highly integrated, and the construction period is not increased basically.
The appearance of the invention can be perfectly fused with the rail top sealant, and the invention has small color difference with asphalt, and is beautiful and smooth.
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 schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a state of completing step 1 according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a state of completing step 2 according to an embodiment of the present invention.
Fig. 4 is a diagram illustrating a state of completing step 3 according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a state of step 4 according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a state of completing step 5 according to an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1, the semi-flexible transition structure on the rail side of the urban tramcar comprises a steel rail 1; the middle part and the lower part of the steel rail 1 are provided with steel rail flexible packages 2 through adhesives 3; two sides of the steel rail 1 are close to the upper part, and rail top sealant 7 is arranged above the steel rail flexible package 2; and a reinforced concrete track bed plate 4 and an asphalt concrete pavement 6 are sequentially arranged on the outer side of the steel rail 1 from bottom to top.
Wherein, the asphalt concrete pavement 6 and the rail top sealant 7 are provided with a semi-flexible transition layer 8;
the semi-flexible transition layer 8 is made of polymer composite materials, and after the semi-flexible transition layer is hardened, the rigidity of the semi-flexible transition layer is between the asphalt concrete pavement 6 and the rail top sealant 7;
the upper surface of the asphalt concrete pavement 6 close to the rail top sealant 7 is provided with a groove for filling a semi-flexible transition layer 8.
The principle of the invention is as follows:
aiming at the joint of an embedded integral ballast bed and a municipal road of a mixed road or a level crossing of a ground line of a modern tramcar, the engineering problem of cracking and damage of asphalt concrete on the rail side is commonly caused, the influence of integral temperature rise and fall, road grade and compactness during paving of the asphalt concrete on the road is comprehensively considered, and through means of engineering summary, coupling analysis and parameter induction, the rail side semi-flexible transition layer for preventing the cracking of the asphalt concrete on the rail side of the embedded integral ballast bed and the construction method thereof are provided, the blank of the urban tramcar industry is filled, and the technical progress of the industry is promoted.
Firstly, the semi-flexible transition layer structure has good bearing capacity and flexibility, and has excellent fatigue damage resistance and chemical stability.
Secondly, because the material is homologous with the rail top sealant and asphalt, the high temperature, the rail top sealant and the asphalt concrete can be utilized to form good boundary fusion in the construction process, and the risk of boundary bonding failure is greatly reduced.
And the construction process can be highly integrated, and the construction period is not increased basically.
Finally, the appearance and the rail top sealant can be perfectly fused, the color difference with asphalt is small, and the appearance is attractive and smooth.
In some embodiments, the cross-section of the groove is stepped, with the depth of the portion closer to the rail head sealant 7 being greater than the depth of the portion further from the rail head sealant 7.
In some embodiments, the depth 2a of the stepped groove close to one side of the rail top sealant (7) is more than or equal to 40mm, and the depth of the stepped groove close to the other side is a;
the width of the groove is 2b, and is related to the overall temperature rise and fall, the grade of the urban road and the compactness of the asphalt concrete when the asphalt concrete is laid, and the calculation formula is as follows:
b≥(η1η2η3be)n×10
wherein, beTaking the width of a semi-flexible transition layer base as 50 mm;
η1delta temperature of integral heating and cooling in combination with asphalt concrete laying for temperature coefficientTPerforming interpolation calculation according to the table 1; t is0The temperature when asphalt concrete is laid; t iseThe maximum/minimum effective temperature standard value of the project location can be calculated according to the average maximum/minimum temperature T of the local day when no relevant technical requirements existtCorrecting consideration considering extreme temperature influence;
η2dividing the road grade coefficient into a expressway, a main road, a secondary main road and a branch road by combining with relevant design specifications of urban road engineering, and taking the expressway, the main road, the secondary main road and the branch road according to the table 2;
η3the density coefficient of the asphalt concrete is 1.0-1.1 according to the density from large to small by combining with relevant standards of construction of asphalt pavement of a highway.
Table 1: temperature coefficient of
Table 2: road grade coefficient
Supposing that the urban tramcar project is laid with the road asphalt concrete in spring with the temperature of 16 ℃ and the average maximum/minimum temperature T in the local daytThe temperature is 33 ℃ and-2 ℃, the thickness of the road fine grain type asphalt concrete surface layer is 45mm, the road fine grain type asphalt concrete surface layer is an urban main road, and the compactness of an asphalt concrete test section is 98.5% during construction, then:
local maximum/minimum effective temperature standard value TeAt 29.32 ℃ and-2 ℃ respectively;
integral temperature raising and lowering deltaTThe temperature is 28 ℃; linear interpolation, eta, according to Table 111.09 was taken.
According to Table 2,. eta2Take 1.05. Combining the relevant specifications of the construction of the asphalt pavement of the highway, the compactness is the median value of the specification allowable range, so eta3Take 1.05.
Therefore, a is 22.5mm, and b is 60 mm.
In some embodiments, the bottom of the recess is provided with an asphalt laying apron 5.
In certain embodiments, the asphalt lay-up sheeting 5 is a hard rubber having a thickness no less than the thickness of the road fine-grained asphalt concrete layer.
In some embodiments, the semi-flexible transition layer 8 is a three-component, thermally constructed, castable composite polymeric material; the first component is homologous with the rail top sealant material, the second component is homologous with the asphalt material, and the third component is the adhesive material of the two components.
In some embodiments, rail flexible wrap 2 is a polymer foam or rubber.
In certain embodiments, adhesive 3 is a modified silane or epoxy adhesive.
As shown in fig. 2 to fig. 6, the invention further provides a construction method of the semi-flexible transition structure on the rail side of the urban tramcar, which comprises the following steps:
3, paving asphalt concrete according to the road construction requirement to pave 6;
step 4, constructing a rail top sealant 7 after the asphalt concrete pavement 6 is constructed and the strength is reached;
and 5, cutting to remove the horizontal asphalt laying guard plate 5, heating the semi-flexible transition layer material by adopting a movable mixer, discharging and pouring after the temperature reaches a preset temperature, and forming a semi-flexible transition layer 8 after cooling and stabilizing.
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 (9)
1. The semi-flexible transition structure at the rail side of the urban tramcar comprises a steel rail (1); the middle part and the lower part of the steel rail (1) are provided with steel rail flexible packages (2) through adhesives (3); two sides of the steel rail (1) are close to the upper part, and rail top sealant (7) is arranged above the steel rail flexible package (2); a reinforced concrete track bed board (4) and asphalt concrete pavement (6) are sequentially arranged on the outer side of the steel rail (1) from bottom to top; the method is characterized in that:
the asphalt concrete pavement (6) and the rail top sealant (7) are provided with semi-flexible transition layers (8);
the semi-flexible transition layer (8) is made of a polymer composite material, and after the semi-flexible transition layer is hardened, the rigidity of the semi-flexible transition layer is between the asphalt concrete pavement (6) and the rail top sealant (7);
and a groove for filling the semi-flexible transition layer (8) is formed in the upper surface of the asphalt concrete pavement (6) close to the rail top sealant (7).
2. The urban tram rail side semi-flexible transition structure according to claim 1, characterized in that the cross section of the groove is stepped, and the depth of the part close to the rail top sealant (7) is greater than the depth of the part far from the rail top sealant (7).
3. The urban tram rail side semi-flexible transition structure according to claim 2, wherein the depth 2a of the stepped groove close to the rail top sealant (7) is more than or equal to 40mm, and the depth of the other side is a;
the width of recess is 2b, and is relevant with whole heating and cooling, urban road grade, asphalt concrete compactness when asphalt concrete lays, and the computational formula is as follows:
b≥(η1η2η3be)n×10
wherein, beTaking the width of a semi-flexible transition layer base as 50 mm;
η1delta temperature of integral heating and cooling in combination with asphalt concrete laying for temperature coefficientT；T0The temperature when asphalt concrete is laid; t iseThe maximum/minimum effective temperature standard value of the project location can be calculated according to the average maximum/minimum temperature T of the local day when no relevant technical requirements existtCorrecting consideration considering extreme temperature influence;
η2as road grade coefficient, knotDividing the urban road engineering into a expressway, a main road, a secondary road and a branch according to relevant design specifications of the urban road engineering;
η3the density coefficient of the asphalt concrete is 1.0-1.1 according to the density from large to small by combining with relevant standards of construction of asphalt pavement of a highway.
4. The semi-flexible transition structure on the tram rail side of the city according to claim 1, characterized in that the groove bottom is provided with an asphalt laying shield (5).
5. The urban tram rail side semi-flexible transition structure according to claim 4, characterized in that the asphalt laying shield (5) is a hard rubber with a thickness not less than the road fine-grained asphalt concrete layer thickness.
6. The urban tram rail side semi-flexible transition structure according to claim 1, characterized in that the semi-flexible transition layer (8) is a three-component, thermally constructed, pour-moldable composite polymer material; the first component is homologous with the rail top sealant material, the second component is homologous with the asphalt material, and the third component is the adhesive material of the two components.
7. The urban tram rail side semi-flexible transition structure according to claim 1, characterized in that the rail flexible wrapping (2) is a polymer foam or rubber.
8. The semi-flexible transition structure on the tram rail side of the city according to claim 1, characterized in that the adhesive (3) is a modified silane or epoxy adhesive.
9. The construction method of the urban tram rail side semi-flexible transition structure according to claim 1, comprising the following steps:
step 1, erecting the steel rail (1); then the steel rail flexible package (2) is installed through the adhesive (3);
step 2, pouring the reinforced concrete road bed board (4), and embedding an asphalt laying protection board (5);
step 3, laying the asphalt concrete pavement according to the road construction requirement (6);
step 4, constructing a rail top sealant (7) after the construction of the asphalt concrete pavement (6) is finished and the strength is reached;
and 5, cutting to remove the horizontal asphalt laying protection plate (5), heating a semi-flexible transition layer material by adopting a movable mixing machine, discharging and pouring after the temperature reaches a preset temperature, and forming a semi-flexible transition layer (8) after cooling is stable.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114561837A (en) * | 2022-03-02 | 2022-05-31 | 上海市城市建设设计研究总院（集团）有限公司 | Pouring method taking semi-flexible asphalt concrete as track lapping material |
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| CN110258198A (en) * | 2019-06-06 | 2019-09-20 | 中铁第四勘察设计院集团有限公司 | Stiffness transition setting method under subway line vibration damping and the plate in non-vibration damping transition location |
| CN111021161A (en) * | 2019-12-31 | 2020-04-17 | 江苏阿道夫公路特种养护工程有限公司 | Construction method of durable tramcar track side pavement structure |
| CN111287034A (en) * | 2020-03-03 | 2020-06-16 | 中国船舶重工集团公司第七一一研究所 | Protective device for tramcar rail |
| CN213232972U (en) * | 2020-08-12 | 2021-05-18 | 武汉大学 | Seamless connection flexible track system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114561837A (en) * | 2022-03-02 | 2022-05-31 | 上海市城市建设设计研究总院（集团）有限公司 | Pouring method taking semi-flexible asphalt concrete as track lapping material |
| CN114561837B (en) * | 2022-03-02 | 2023-09-05 | 上海市城市建设设计研究总院（集团）有限公司 | Pouring method with semi-flexible asphalt concrete as track lap joint material |
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