CN112127216B - Prefabricated assembly type asphalt substrate type ballastless track and construction method thereof - Google Patents
Prefabricated assembly type asphalt substrate type ballastless track and construction method thereof Download PDFInfo
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- CN112127216B CN112127216B CN202011062309.5A CN202011062309A CN112127216B CN 112127216 B CN112127216 B CN 112127216B CN 202011062309 A CN202011062309 A CN 202011062309A CN 112127216 B CN112127216 B CN 112127216B
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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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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Abstract
The invention provides a prefabricated assembly type asphalt substrate type ballastless track and a construction method thereof, which are characterized in that: the track slab comprises a track slab located above and an aggregate base layer, a permeable layer, a compact asphalt concrete layer and non-woven geotextiles which are sequentially arranged below the track slab from bottom to top, wherein waterproof asphalt precast blocks are paved on road shoulders on two sides of the compact asphalt concrete layer on site, the track slab, the non-woven geotextiles and the compact asphalt concrete layer form a prefabricated composite board, and a plurality of composite boards are spliced to form a complete track structure according to actual requirements. The track structure provided by the invention can disperse the load of an upper train on the premise of ensuring the high smoothness of the high-speed railway track, so that the load is uniformly distributed and transmitted downwards; the compact asphalt concrete layer can slow down the influence of the vibration generated by the running dynamic load of the high-speed train on the lower structure, reduce the noise generated when the train passes by and play a role in buffering, absorbing and reducing the noise.
Description
Technical Field
The invention relates to the technical field of high-speed railways and urban rail transit, in particular to a prefabricated asphalt substrate type ballastless track and a construction method thereof.
Background
The high-speed railway is a trend of development of the passenger railway in China, and the ballastless track is called as a main trend of development of the high-speed railway in China due to double restrictions of influence of ballast flying of the ballast track on high-speed operation of the railway and lack of ballast raw materials of the high-speed railway in China.
The currently applied plate type ballastless tracks in China mainly comprise three types, namely a CRTS I plate type track evolved by a Japanese new trunk ballastless track, a CRTS II plate type track evolved by a German Bo grid plate and a CRTS III plate type track independently researched and developed in China, wherein the most widely applied track type is the CRTS III plate type ballastless track, the CRTS I plate type track and the CRTS II plate type track are different from a connection and damping material of a concrete plate and a track plate by adopting CA mortar, the main structure of the track type ballastless track is different from top to bottom, and the track type ballastless track comprises a track plate, a self-compacting concrete layer, an intermediate isolating layer and a reinforced concrete base, and the self-compacting concrete layer is a damping main structure. During construction, the sleepers are generally paved layer by layer from bottom to top on site, and the operations of hoisting the sleepers, assembling the track panel, roughly and finely adjusting the track panel, pouring concrete and the like are performed.
Meanwhile, the part above the ballastless track roadbed is almost completely composed of a concrete structure, the strength and the rigidity are excessive, the requirement of a high-speed railway on high smoothness can be met, and the vibration and the noise are large. Therefore, new materials are introduced into the ballastless track structure to absorb shock and reduce noise, and meanwhile, the ballastless track structure has a waterproof function and is a development direction of ballastless track railways in China.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a prefabricated asphalt substrate type ballastless track and a construction method aiming at the defects in the prior art, the structure can weaken vibration and noise generated by dynamic load of a train, and the construction method can reduce time consumption and labor power of site construction and weaken influence of environmental factors on the site construction.
Aiming at the problems in the prior art, the technical scheme adopted by the invention for solving the problems in the prior art is as follows:
the utility model provides a prefabricated assembled asphalt substrate formula ballastless track which characterized in that: the track slab comprises a track slab positioned above and an aggregate base layer, a permeable layer, a compact asphalt concrete layer (AC) and non-woven geotextile which are sequentially arranged below the track slab from bottom to top, wherein waterproof asphalt precast blocks (SAMI) are paved on the spot on road shoulders on two sides of the compact asphalt concrete layer, the track slab, the non-woven geotextile and the compact asphalt concrete layer form a prefabricated composite board, and a plurality of composite boards are spliced to form a complete track structure according to actual requirements.
The track slab is a C60 concrete track slab, and the track slab is a unit slab or a longitudinal connecting slab.
Adopt recess and tenon structure cooperation to connect around the cell board, indulge even the board and adopt the exposed vertical reinforcing bar and the stretch-draw latch fitting of leading to carry out the bolt joint, exposed reinforcing bar and stretch-draw latch fitting spraying anti-rust paint.
The thickness of the compact asphalt concrete layer is 200-350mm, Ev2≥150N/mm2。
The compact asphalt concrete layer recommends the use of waste rubber modified asphalt, and the raw material of the asphalt is waste tires.
And the compact asphalt concrete layer is used as a waterproof layer to carry out closed paving, and the longitudinal connecting section is subjected to waterproof treatment.
The method is characterized in that road shoulders on two sides of the compact asphalt concrete layer are paved with 500mm multiplied by 50mm waterproof asphalt precast blocks on site, after the waterproof asphalt precast blocks are heated and rolled, 5mm waterproof sealing layers are arranged on the surfaces and the side faces of the compact asphalt concrete layer, and joints between the waterproof asphalt precast blocks and the sections of the compact asphalt concrete layer are processed by adopting a repairing self-healing technology.
The granular material base layer is used as a leveling layer and is paved after the on-site roadbed is qualified through inspection, and the granular material base layer is made of a cement stable granular material base layer meeting the standard requirement and comprises broken stones, gravel, slag and the like.
And the upper surface of the granular base layer is sprayed with penetrating layer oil.
A construction method for prefabricating an assembled asphalt substrate type ballastless track is characterized by comprising the following steps:
the construction sequence is layered paving and compacting of roadbed → paving of aggregate base layer (leveling layer → spraying permeable oil → integral hoisting of track asphalt composite board → connection of composite board → on-site paving of waterproof asphalt precast block 6 → heating and rolling of road shoulder waterproof asphalt precast block → self-healing of asphalt joint → waterproofing treatment of section → edge sealing treatment of track board → paving of steel rail → fine adjustment of steel rail position → welding of steel rail.
Before the permeable layer oil construction, the top surface of a base layer needs to be thoroughly cleaned, the base layer is kept clean, the flatness meets the requirement, and permeable layer construction is carried out after the base layer is qualified through inspection and acceptance; fully permeating the permeable emulsified asphalt, demulsifying, completely evaporating and then performing seal construction; if the foundation condition is stable and the bearing force is uniform, unit plates are adopted, the prefabricated track plates are connected into a whole through the tenon and the groove, each plate is still an independent unit, and no longitudinal connecting plate is formed, so that the conditions that the stress is complex and the maintenance and repair operation is difficult are avoided; if the longitudinal connecting plate is adopted, the steel bars and the tensioning locking pieces between the composite plates do not undergo wet joint treatment, so that the whole structure is convenient to disassemble and replace; the rail fastener is also arranged on the rail plate when being prefabricated by a workshop; paving the asphalt waterproof section of the prefabricated road shoulder after the pavement of the on-site composite board structure is finished, and treating the joint between the asphalt layer of the composite board and the waterproof asphalt prefabricated block by an asphalt self-healing technology; the asphalt layer integrally forms a closed section, a waterproof coating with the thickness of 5mm is laid on the section, and meanwhile, the waterproof of the AC longitudinal connecting section needs to be considered, so that ground water cannot seep downwards through a seam, and the side edge sealing of the track slab is carried out; after the steel rail is laid, only the steel rail and the fasteners are finely adjusted to meet the smoothness requirement required by welding of the seamless steel rail, and after the adjustment and alignment, the steel rail is welded.
The steel bar net is composed of longitudinal steel bars and transverse steel bars, the width of each steel bar net is 50mm, the steel bar net can be repeatedly used, specifically arrangement gaps need to be obtained according to calculation, and it is necessary to guarantee that no debonding exists between the compact asphalt concrete layer and the track slab during forward hoisting.
The invention has the following advantages:
1. according to the prefabricated asphalt substrate type ballastless track and the construction method thereof, the structure can disperse the load of an upper train on the premise of ensuring the high smoothness of a high-speed railway track, so that the load is uniformly distributed and transmitted downwards; compact asphalt concrete layer can slow down the influence of the vibration that high speed train driving dynamic load produced to substructure, and can reduce the noise that the train produced when passing through, plays the effect of buffering shock attenuation noise reduction, and waterproof section can prevent that the road bed from being destroyed by the infiltration surface water. The construction technology can save the time and labor for site construction on the premise of ensuring the quality of the track slab and the supporting facilities thereof.
2. The geotextile is laid between the track slab and the asphalt concrete layer, so that the interface frictional resistance of the concrete and the asphalt layer is increased while the asphalt reflection crack is prevented and controlled, and the structure is tightly connected into a whole.
3. If the foundation condition is stable and the bearing force is uniform, the unit plate form is adopted, so that the complex stress and the difficult maintenance after the longitudinal connecting plate is formed can be avoided.
4. The track subgrade structure layer has reasonable and optimized vertical rigidity transition, and can realize effective control of the roadbed support rigidity value.
5. The construction method can meet the requirement that the construction of the workshop prefabrication and the construction of the site substructure are carried out simultaneously, and the construction time is saved.
6. The invention carries out the prefabrication in the factory and the field assembly, thereby reducing the influence of the field external climate environmental factors on the construction conditions and progress.
Drawings
Fig. 1 is a schematic cross-sectional view of a prefabricated asphalt substrate type ballastless track structure of the present invention;
FIG. 2 is a structure diagram of a unit plate type track plate of the prefabricated asphalt substrate type ballastless track structure of the invention;
fig. 3 is a structural view of a vertical connecting plate type track plate of the prefabricated asphalt substrate type ballastless track structure of the invention;
fig. 4 is a construction sequence diagram of a prefabrication stage of the prefabricated asphalt substrate type ballastless track structure of the invention;
fig. 5 is a schematic front view of a steel bar net used for binding in the prefabrication and transportation and hoisting stages of the prefabricated asphalt substrate type ballastless track structure according to the invention;
FIG. 6 is a schematic three-dimensional view of a steel bar net used for prefabricating and binding a prefabricated asphalt substrate type ballastless track structure in the transportation and hoisting stages;
fig. 7 is a schematic diagram of a laying stage of the prefabricated unit asphalt substrate type ballastless track structure of the invention;
fig. 8 is a schematic diagram of a laying stage of the prefabricated longitudinal asphalt substrate type ballastless track structure according to the present invention;
wherein: 1-track slab, 2-concrete edge sealing, 3-geotextile, 4-compact asphalt concrete layer, 5-permeable layer, 6-waterproof asphalt precast block, 7-waterproof coating, 8-aggregate base layer, 9-unit track slab, 10-fastener groove, 11-groove, 12-tenon, 13-longitudinal track slab, 14-longitudinal steel bar, 15-bolt, 16-transverse steel bar, 17-ballastless track, 18-longitudinal steel bar and 19-roadbed.
Detailed Description
The technical solution of the present invention is further specifically described below by way of embodiments and with reference to the accompanying drawings, as shown in fig. 1, the present invention is a prefabricated assembly type asphalt substrate type ballastless track structure of a preferred embodiment, and includes a track slab 1, a non-woven geotextile 3, a dense asphalt concrete layer 4, a permeable layer 5, and a granule base layer 8 from top to bottom.
In the embodiment, the track slab is a C60 concrete slab, and has two forms of a unit type and a longitudinal type.
In this embodiment, the non-woven geotextile is laid between the track slab 1 and the compact asphalt concrete layer 4 to prevent the asphalt layer from generating reflection cracks.
In this embodiment, the asphalt layer is a dense asphalt concrete layer with a thickness of 200-v2≥150N/mm2。
In this embodiment, all kinds of asphalt concrete can be used as the prefabricated asphalt concrete layer, including SBS modified asphalt, epoxy asphalt, waste rubber modified asphalt, and the like. In order to protect the environment, waste rubber modified asphalt concrete is recommended, which takes waste tires as raw materials to prepare rubber modified asphalt, wherein the waste tires contain various high molecular polymers such as Styrene Butadiene Rubber (SBR), natural rubber and the like and various additives which are effective components for improving the performance of the asphalt, and the Styrene Butadiene Rubber (SBR) modifier has good low-temperature crack resistance and good bonding performance, can increase the reutilization of waste materials, plays a role in treating pollution, saving resources and comprehensively utilizing a large amount of waste materials, and meets the requirement of sustainable development. Meanwhile, the rubber modified asphalt has excellent elastic recovery performance, fatigue resistance, durability, water damage resistance, crack resistance and the like, is favorable for slowing down the transmission of vertical load, reduces the vibration influence on the lower structural layer and reduces the noise pollution generated by the dynamic load of the train.
In this embodiment, closely knit type pitch layer carries out closed pavement, and the waterproof pitch prefabricated section 6 of paving in its both sides form waterproof section by the on-the-spot hoist and mount of composite construction is accomplished back, and waterproof coating 7 of thickness 5mm is laid to section department to carry out the banding to track board 1 side, prevent that track board upper portion rainwater from oozing down via the section gap and destroying the road bed, the life and the maintenance cycle of extension structure.
In this embodiment, the aggregate base layer is made of a cement stabilized aggregate base layer meeting the specification, and includes crushed stone, gravel, slag, and the like.
In this example, the surface layer of the pellet base layer was sprayed with the prime coat oil, and emulsified asphalt was selected as the prime coat oil in an amount of 1.0-2.0L/m2The viscosity is adjusted by adjusting the amount of the diluent or the concentration of the emulsified asphalt, the penetration degree of the base asphalt is usually not less than 100(1/10mm), and the permeable layer 5 is sprayed after the roadbed is qualified and the aggregate base layer is paved.
The track subgrade structure layer has reasonable and optimized vertical rigidity transition, and can realize effective control of the roadbed support rigidity value.
The aggregate base layer grading refers to the relevant regulations of technical Specification for road asphalt pavement construction (JTG F40-2004) and design Specification for high-speed railways (TB 10621-2014), and the recommended screening value refers to Table 1.
TABLE 1 base gradation screening values for granules
The construction method of the prefabricated asphalt substrate type ballastless track structure comprises the following steps:
when the workshop is prefabricated, the structure is paved in layers. The construction sequence is as follows: track slab laying construction → concrete maintenance → track slab inversion → geotextile laying → dense asphalt concrete layer laying and compaction → steel bar net binding and fixing. And simultaneously, prefabricating the waterproof asphalt precast block 6. Inverting the track slab with the track fastener arranged in the fastener groove on the upper surface, laying the non-woven geotextile on the bottom surface of the track slab, laying the compact asphalt concrete 4,carrying out multilayer paving compaction on the asphalt, wherein the thickness is 200-350mm, Ev2≥150N/mm2The geometric dimension of the track plate is the same as that of the track plate, so that the track plate can reach the standard required by engineering, and the whole structure is aligned and adjusted, so that the structure is precisely aligned from top to bottom.
When the track panel laying vehicle is laid on site, the track panel laying vehicle directly transports the prefabricated track panel structure from a workshop to carry out on-site assembly. During transportation, the prefabricated composite board is inverted (in the same prefabrication stage), transported to the site and hoisted to a target position together with the steel bar net in the forward direction, after the prefabricated composite board is aligned, temporary supports are arranged at four corners of the composite board, the steel bar net bottom plate is removed and then falls, and then the upper steel bars are removed.
The construction sequence is as follows: a unit plate: layered paving and compacting of roadbed → paving of aggregate base layer (leveling layer → spraying permeable oil → integral hoisting of track asphalt composite board → on-site paving of waterproof asphalt precast block 6 → heating and rolling of shoulder waterproof asphalt precast block 6 → self-healing of asphalt joint → waterproofing of section → edge sealing of track board → paving of steel rail → fine adjustment of steel rail position → welding of steel rail.
Longitudinal connecting plates: layered paving and compacting of roadbed → paving of aggregate base layer (leveling layer → spraying permeable oil → integral hoisting of track asphalt composite board → longitudinal connection of composite board → on-site paving of waterproof asphalt precast block 6 → heating and rolling of road shoulder waterproof layer → self-healing of asphalt joint → waterproofing treatment of section → edge sealing treatment of track board → paving of steel rail → fine adjustment of steel rail position → welding of steel rail.
Thoroughly cleaning the top surface of the base layer before the permeable layer oil construction, keeping clean, and carrying out permeable layer construction after the flatness meets the requirement and is qualified through inspection and acceptance; fully permeating the permeable emulsified asphalt, demulsifying, completely evaporating and then performing seal construction; if the foundation condition is stable and the bearing force is uniform, unit plates are adopted, the prefabricated track plates are connected into a whole through the tenon and the groove, each plate is still an independent unit, and no longitudinal connecting plate is formed, so that the conditions that the stress is complex and the maintenance and repair operation is difficult are avoided; if the longitudinal connecting plate is adopted, the steel bars and the tensioning locking pieces between the composite plates do not undergo wet joint treatment, so that the whole structure is convenient to disassemble and replace; the rail fastener is also arranged on the rail plate when being prefabricated by a workshop; paving the asphalt waterproof section of the prefabricated road shoulder after the on-site composite board structure is paved, and treating the joint between the asphalt layer of the composite board and the prefabricated asphalt board by an asphalt self-healing technology; the asphalt layer integrally forms a closed section, a waterproof coating with the thickness of 5mm is laid on the section, and meanwhile, the waterproof of the AC longitudinal connecting section needs to be considered, so that ground water cannot seep downwards through a seam, and the side edge sealing of the track slab is carried out; after the steel rail is laid, only the steel rail and the fasteners are finely adjusted to meet the smoothness requirement required by welding of the seamless steel rail, and after the adjustment and alignment, the steel rail is welded.
The protective scope of the present invention is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present invention by those skilled in the art without departing from the scope and spirit of the present invention. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (6)
1. A construction method for prefabricating an assembled asphalt substrate type ballastless track is characterized by comprising the following steps: the prefabricated assembled asphalt substrate type ballastless track is characterized in that: the track slab comprises an upper track slab, and an aggregate base layer, a permeable layer, a compact asphalt concrete layer and a non-woven geotextile which are sequentially arranged below the track slab from bottom to top, wherein waterproof asphalt precast blocks are paved on road shoulders on two sides of the compact asphalt concrete layer on site, the track slab, the non-woven geotextile and the compact asphalt concrete layer form a prefabricated composite board, and a plurality of composite boards are spliced to form a complete track structure according to actual requirements; the track slab is a C60 concrete track slab, and the track slab is a unit slab or a longitudinal connecting slab; the front and the back of the unit plates are matched and connected by adopting a groove and tenon structure, the longitudinal connecting plate is bolted by adopting a longitudinal steel bar with an exposed head and a tensioning locking piece, and the exposed steel bar and the tensioning locking piece are sprayed with antirust paint;
the construction method of the prefabricated asphalt substrate type ballastless track comprises the following steps:
step 1, a workshop prefabricating stage: the construction sequence is as follows: track slab laying construction → concrete maintenance → track slab inversion → geotextile laying → dense asphalt concrete layer laying and compaction → steel bar net binding and fixing, and simultaneously, the prefabrication work of waterproof asphalt precast blocks is carried out;
step 2, in the field laying stage: the track panel laying vehicle directly transports the prefabricated track plate structure from a workshop for field assembly, during transportation, the prefabricated composite plate is inverted, transported to the field and hoisted to a target position along with the steel bar net in a forward direction, after alignment, temporary supports are arranged at four corners of the composite plate, a bottom plate of the steel bar net is removed and then is settled, and then an upper steel bar is removed; the construction sequence is layered paving and compacting of a roadbed → paving of a granular material base layer → spraying penetrating oil → integral hoisting of a track asphalt composite board → connection of the composite board → on-site paving of a waterproof asphalt prefabricated block → heating and rolling of a shoulder waterproof asphalt prefabricated block → self-healing of an asphalt joint → waterproofing treatment of a section → edge sealing treatment of a track board → paving of a steel rail → fine adjustment of the position of the steel rail → welding of the steel rail.
2. The construction method of the prefabricated asphalt substrate type ballastless track according to claim 1, wherein: the thickness of the compact asphalt concrete layer is 200-350mm, Ev2≥150N/mm2。
3. The construction method of the prefabricated asphalt substrate type ballastless track according to claim 1, wherein: and the compact asphalt concrete layer is used as a waterproof layer to carry out closed paving, and the longitudinal connecting section is subjected to waterproof treatment.
4. The construction method of the prefabricated asphalt substrate type ballastless track according to claim 1, wherein: the method is characterized in that road shoulders on two sides of the compact asphalt concrete layer are paved with 500mm multiplied by 50mm waterproof asphalt precast blocks on site, after the waterproof asphalt precast blocks are heated and rolled, 5mm waterproof sealing layers are arranged on the surfaces and the side faces of the compact asphalt concrete layer, and joints between the waterproof asphalt precast blocks and the sections of the compact asphalt concrete layer are processed by adopting a repairing self-healing technology.
5. The construction method of the prefabricated asphalt substrate type ballastless track according to claim 1, wherein: and the upper surface of the granular base layer is sprayed with penetrating layer oil.
6. The construction method of the prefabricated asphalt substrate type ballastless track according to claim 1, wherein: the steel bar net is composed of longitudinal steel bars and transverse steel bars with the width of 50 mm.
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| CN101831855B (en) * | 2010-03-25 | 2013-02-06 | 马银华 | Waterproof pavement structure and construction method thereof |
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| EP2468954A1 (en) * | 2010-12-27 | 2012-06-27 | Sonneville AG | Method for manufacturing a ballastless trackway for rail vehicles with an recue route for street vehicles |
| CN202323563U (en) * | 2011-11-04 | 2012-07-11 | 中铁二十三局集团有限公司 | Post-tensioned prestressed rail composite plate |
| DE102016114855A1 (en) * | 2016-08-10 | 2018-02-15 | Max Bögl Stiftung & Co. Kg | Trough-shaped superstructure for a bridge, bridge, precast concrete part for a trough of a bridge and method for the construction of a bridge |
| CN107558309B (en) * | 2017-09-26 | 2019-07-12 | 武汉理工大学 | A kind of vibration damping thermal insulation type unit plate type ballastless track structure |
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| CN108486963B (en) * | 2018-04-27 | 2023-08-01 | 西南交通大学 | Ballastless track waterproof roadbed bed structure and paving method thereof |
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