CN112030611B - Assembled continuous floating slab track structure adapting to driving direction - Google Patents
Assembled continuous floating slab track structure adapting to driving direction Download PDFInfo
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- CN112030611B CN112030611B CN202010997023.XA CN202010997023A CN112030611B CN 112030611 B CN112030611 B CN 112030611B CN 202010997023 A CN202010997023 A CN 202010997023A CN 112030611 B CN112030611 B CN 112030611B
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- floating plate
- floating
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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
- 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
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
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- Vibration Prevention Devices (AREA)
Abstract
The invention discloses an assembled continuous floating slab track structure adapting to a driving direction, which comprises a lower foundation and a floating slab, wherein the floating slab comprises a plurality of floating slabs which are overlapped together, each floating slab comprises a floating slab main body and cuboid-shaped staggered platforms integrally arranged on the floating slab main body, for any two adjacent floating slabs, each floating slab is provided with a staggered platform at one side close to the other floating slab, each staggered platform extends towards the direction close to the other floating slab, the staggered platform on one floating slab is placed on the staggered platform of the other floating slab, the extending direction of the upper staggered platform on the floating slab main body is consistent with the driving direction of a train, and the thickness of the upper staggered platform is smaller than that of the lower staggered platform. The invention improves the construction precision and stability of the floating slab, meets the special vibration reduction requirement of rail transit, and can improve the stability of a rail structure while reducing the on-site construction workload.
Description
Technical Field
The invention belongs to the field of railway track structures, and particularly relates to an assembled floating slab track structure.
Background
The vibration reduction design of the rail transit engineering is an important point and a difficult point of the design of a rail system. In general, vibration damping levels are classified into three levels of medium vibration damping, higher vibration damping and special vibration damping according to criticism prediction superscalar. Wherein, special vibration reduction measures adopt steel spring floating plate vibration reduction ballast bed.
The floating slab track is widely applied in the subway project of the traditional urban rail transit, the design technical scheme is mature and reliable, but the running speed of the vehicle is not more than 100km/h, and the axle weight of the vehicle is not more than 16t.
With the rapid development of urban rail transit, the maximum running speed of the train reaches 100-160 km/h, the axle weight of the train is 17t, the running speed of the train is greatly improved compared with that of the conventional urban rail transit, the axle weight is increased, and higher requirements are provided for the construction precision and stability of the floating slab track bed.
Patent CN110700023a proposes a construction method of a steel spring floating slab integral ballast bed based on track engineering, the construction method is based on a steel spring floating slab ballast bed applied to domestic urban rail transit, and a short sleeper or trackless sleeper cast-in-situ ballast bed mode is adopted. The cast-in-situ ballast bed has large site construction and concrete pouring amount, and brings a series of problems of environmental pollution, large labor amount, long construction period and the like. In addition, because the short sleeper is of an independent structure, a fixed connection mode is not arranged between the sleepers, the interaction force between the rails is transmitted only by the concrete of the ballast bed, and the geometric behavior of the rail is poor in holding capacity. The deviation of the steel spring floating slab ballastless track bed Shi Guiju after construction is finished is large, the distribution of the rail bottom slope is uneven, the track fine tuning workload is large, and the stable running of the train is influenced.
Patent CN203475237U proposes a prefabricated steel spring floating plate, the transverse force between the floating plates is transferred through end bosses, and the floating plates are connected in a hinged manner. The scheme adopts the prefabricated track slab, but the hinging mode of the prefabricated track slab makes the floating slab difficult to replace in the later maintenance. The end part is hinged, so that the prefabricated floating plates cannot be conveniently taken out when diseases occur, the plurality of floating plates are required to be lifted at the same time, the replacement and maintenance of the floating plates can be realized, and the workload is large. The vertical force at the transition part of the floating plate in the scheme is provided by hinging, so that the hinge device of the floating plate is not friendly to the stress, and potential safety hazards exist.
Patent CN204385564U proposes a lap-joint floating ballast bed, where the traditional hinging mode is cancelled at the transition of the floating slab, and the vertical load of the train is transferred through the lap-joint of the two ballast bed slabs. The overlap joint of the floating slab lapping platform is fixed by the bolts of the upper through holes and the lower through holes, but the space height below the floating slab is only 20-40 mm, and the bolts of the through holes do not have the condition of construction operation during installation and later maintenance, so that the fixing mode still has defects. In addition, the hinge mode adopted by the traditional floating slab track bed is canceled, vertical force is transmitted by utilizing the floating slab bridge, the transmission of transverse force and longitudinal force at the transition part of the floating slab is completely completed by the through hole bolts, and under the fatigue effect of a larger train load, the slender bolts are easy to damage, the stressed environment is not friendly, and potential safety hazards exist. Meanwhile, in the scheme, the thicknesses of the upper layer of lapping platform and the lower layer of lapping platform are kept consistent, and when a train runs bidirectionally, bending moment born by the lower layer of staggering platform is larger, and crack is easy to generate at the disassembling part of the lower layer of staggering platform, so that the running is subjected to potential safety hazard.
Therefore, in order to improve the construction precision and stability of the floating slab, on the premise of meeting the special vibration reduction requirement of the rail transit, the assembled floating slab rail structure adaptive to the traveling direction is provided, and the stability of the rail structure is in line with the future development trend while the field construction workload is reduced.
Disclosure of Invention
Aiming at the defects or improvement demands of the prior art, the invention provides an assembled continuous floating slab track structure adapting to the driving direction, which improves the construction precision and stability of a floating slab, meets the special vibration reduction demands of track traffic, and can improve the stability of the track structure while reducing the field construction workload.
In order to achieve the above object, according to one aspect of the present invention, there is provided an assembled continuous floating slab track structure adapted to a driving direction, comprising a lower foundation and a floating slab structure disposed on the lower foundation through an elastic vibration isolator, wherein an under-slab gap exists between the floating slab structure and the lower foundation, the floating slab structure comprises a plurality of floating slabs overlapped together, each of the floating slabs comprises a floating slab body and a cuboid-shaped staggered platform integrally disposed on the floating slab body, and:
For any two adjacent floating plates, each floating plate is provided with a staggered platform on one side close to the other floating plate, each staggered platform extends towards the direction close to the other floating plate, the staggered platform on one floating plate is placed on the staggered platform of the other floating plate, the upper staggered platform and the lower staggered platform are respectively an upper staggered platform and a lower staggered platform, the extending direction of the upper staggered platform on the floating plate main body is consistent with the train running direction, the distance from the upper surface to the lower surface of the upper staggered platform, namely the thickness of the upper staggered platform is h 1, the distance from the upper surface to the lower surface of the lower staggered platform, namely the thickness of the lower staggered platform is h 2,h1＜h2, the upper staggered platform is provided with an upper bar planting hole, and the lower staggered platform is fixedly connected with the bar planting hole in a manner of the upper bar planting hole and the lower bar planting hole.
Preferably, two drainage ditches are arranged on the lower foundation, the floating plate structure is positioned between the two drainage ditches, and the longitudinal direction of each drainage ditch is consistent with the longitudinal direction of the lower foundation.
Preferably, the top end of each floating plate main body is provided with two rows of rail bearing tables, and the longitudinal direction of each row of rail bearing tables is consistent with the longitudinal direction of the lower foundation.
Preferably, two rows of vibration isolator mounting holes are formed in each floating plate main body, the longitudinal direction of each row of vibration isolator mounting holes is consistent with the longitudinal direction of the lower foundation, the number of vibration isolator mounting holes in each row is half that of the rail bearing platforms in each row, and vibration isolator mounting holes are formed between two adjacent rail bearing platforms in each row.
Preferably, an elastic cushion is arranged between the upper staggered platform and the lower staggered platform, and through holes serving as middle bar planting holes are formed in positions, corresponding to the upper bar planting holes and the lower bar planting holes, of the elastic cushion.
Preferably, the vertical stiffness of the elastic cushion is not less than the vertical stiffness of the elastic vibration isolator.
Preferably, h 1/h2 = 0.5-0.75.
Preferably, a slab gap exists between each of the dislocation and the floating slab body adjacent to the dislocation.
Preferably, the top end of the lower foundation is further provided with two rows of transverse limiting supports, the floating slab structure is located between the two rows of transverse limiting supports, the longitudinal direction of each row of transverse limiting supports is consistent with the longitudinal direction of the lower foundation, and each transverse limiting support is abutted with the floating slab main body so as to limit the transverse displacement of the floating slab main body.
Preferably, the upper bar planting holes and the lower bar planting holes are through holes and blind holes respectively.
In general, the above technical solutions conceived by the present invention, compared with the prior art, enable the following beneficial effects to be obtained:
1) By the implementation of the invention, the construction precision of the floating slab track bed can be improved, the geometric shape and position retaining capacity of the steel rail and the sleeper can be improved, the special vibration reduction requirement of higher speed (100-160 km/h) can be met, the blank of the special vibration reduction track structure of the urban railway can be filled, and meanwhile, the invention can also be applied to the lines such as inter-city and subway.
2) The assembled floating slab track structure is adopted, the floating slab is prefabricated in a factory, the concrete pouring amount of a construction site is reduced, and the construction operation efficiency is improved. Meanwhile, compared with the cast-in-situ floating slab, the precision of the prefabricated floating slab is obviously improved, the construction precision is improved, the stability of a track structure is improved, and the running stability of a train is improved.
3) The short floating plate is assembled and solidified on site to form a long floating plate structure, so that the stability of the track structure is improved, the special vibration reduction requirement is met, and the short floating plate has the characteristics of small size and light weight, and can improve the flexibility of on-site construction and the convenience of later maintenance.
4) The mode of implanting the reinforcing steel bars is adopted, the adjacent floating plates are fixedly connected through the reinforcing steel bar implanting holes in the floating plates, so that the mounting strength of the staggered connection positions of the track of the floating plates is more reliable, and the assembling and mounting efficiency of the floating plates is improved.
5) The implanted steel bars connect and fix the upper and lower staggered tables through the steel bar implanting holes of the upper and lower staggered tables. Adjacent floating plates are fixedly connected by implanted steel bars to form a long floating plate structure, a plurality of short floating plates are assembled to form the long floating plate structure, and the integrity of the floating plate track structure is improved.
6) A vibration isolation cushion layer is arranged between the upper and lower staggered platforms, and is used for buffering the vertical interaction force between the adjacent floating plates, so that the concrete extrusion damage at the staggered platform interface of the upper and lower parts is avoided.
7) The upper and lower staggered platforms of the floating slab adopt a proportion structure with thin upper part and thick lower part, so that the adaptability of the structural strength of the staggered platform assembly part to unidirectional driving load can be further improved, the structural strength of the lower staggered platform is improved, the load characteristics of unidirectional passing of trains on a line are met, and the utilization rate of the concrete material strength is improved.
8) And the two sides of the middle part or the end part of the floating slab are provided with transverse limiting supports, so that the transverse displacement of the floating slab is limited when the train passes at high speed or in a curve, the transmission of the transverse force of the track to the position where the steel bar is implanted is reduced, the stress environment of the implanted steel bar is improved, and the overall reliability of the track structure is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an exploded schematic view of the present invention;
FIG. 3 is a side view of the invention in a staggered table assembly;
FIG. 4 is a schematic cross-sectional view of the invention in a staggered configuration;
FIG. 5 is a block diagram of a floating plate positioned at an end portion of the present invention;
FIG. 6 is a block diagram of a floating plate positioned in the middle in the present invention;
fig. 7 is a schematic view of an elastic cushion of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1 to 7, an assembled continuous floating slab track structure adapting to a driving direction comprises a lower foundation 1 and a floating slab structure placed on the lower foundation 1 through elastic vibration isolators, wherein an underfloor gap 102 exists between the floating slab structure and the lower foundation 1, the floating slab structure comprises a plurality of floating slabs which are overlapped together, each floating slab comprises a floating slab main body and a cuboid-shaped staggered platform integrally arranged on the floating slab main body, each floating slab main body is provided with two rows of vibration isolator mounting holes 204, the longitudinal direction of each vibration isolator mounting hole 204 is consistent with the longitudinal direction of the lower foundation 1, each vibration isolator mounting hole 204 is internally provided with the elastic vibration isolators, the floating slab is supported through the elastic vibration isolators, and:
For any two adjacent floating slabs, each floating slab is provided with the dislocation at one side close to the other floating slab, each dislocation extends towards the direction close to the other floating slab, the dislocation on one floating slab is placed on the dislocation of the other floating slab, the upper dislocation and the lower dislocation are respectively an upper dislocation 206 and a lower dislocation 207 (the upper dislocation 206 is located above the lower dislocation 207 and is required to be overlapped), the top end of the upper dislocation 206 is preferably flush with the top end of the floating slab body, the top end of the lower dislocation 207 is preferably flush with the bottom end of the floating slab body, the extending direction of the upper dislocation 206 on the floating slab body is consistent with the travelling direction, the distance from the upper surface to the lower surface of the upper dislocation 206 is h 1, the distance from the upper surface to the lower surface of the lower dislocation 207 is h 2,h1＜h2, preferably h 1/h2 = 0.5-0.3775, preferably h 35:3:4, and the upper dislocation 207 is preferably flush with the upper and lower dislocation 207 is provided with the thickness of 3:3:4. Because the train running on the actual line usually runs unidirectionally relative to the floating slab track structure, the thicknesses of the upper staggered platform 206 and the lower staggered platform 207 are set according to the principle of upper thinness and lower thickness for the asymmetric track structure form provided by the invention, so that the adaptability of the track structure to unidirectional running load is improved, and the assembled track structure provided by the invention is adapted to the actual running direction.
The upper staggered platform 206 is provided with an upper bar planting hole 205, the lower staggered platform 207 is provided with a lower bar planting hole 209 at a position corresponding to the upper bar planting hole 205, and the upper staggered platform 206 and the lower staggered platform 207 are fixedly connected in a bar planting mode of the upper bar planting hole 205 and the lower bar planting hole 209.
Referring to fig. 1,2, 5 and 6, the floating plate of the present invention may have three structural types, a first end floating plate 201 (fig. 5), a middle floating plate 202 (fig. 6) and a second end floating plate (not shown). The middle floating plate 202 is positioned between the first end floating plate 201 and the second end floating plate, the first end floating plate 201 comprises a first floating plate main body and an upper staggered platform 206, the upper staggered platform 206 of the first end floating plate 201 is integrally arranged at the upper part of one side of the first end floating plate 201 main body close to the middle floating plate 202, the second end floating plate comprises a second floating plate main body and a lower staggered platform 207, and the lower staggered platform 207 of the second end floating plate is integrally arranged at the lower part of one side of the second end floating plate main body close to the middle floating plate 202;
The intermediate floating plate 202 includes an intermediate floating plate 202 main body, an upper dislocation 206, and a lower dislocation 207, and the lower dislocation 207 of the intermediate floating plate 202 is disposed at a lower portion of a side of the intermediate floating plate 202 main body near the first end floating plate 201, and the upper dislocation 206 of the intermediate floating plate 202 is disposed at an upper portion of a side of the intermediate floating plate 202 main body near the first end floating plate 201. The number of intermediate floating plates 202 may be plural and their structures are identical.
The upper staggered platform 206 of the first end floating plate 201 is fixedly connected with the lower staggered platform 207 of the middle floating plate 202 by means of a bar planting mode after being lapped, and the two adjacent middle floating plates 202 are fixedly connected by means of a bar planting mode after being lapped with the lower staggered platform 207 by the upper staggered platform 206, and the upper staggered platform 206 of the middle floating plate 202 is fixedly connected with the lower staggered platform 207 of the second end floating plate by means of a bar planting mode after being lapped with the lower staggered platform 207.
The floating plates of the invention can be prefabricated in factories, one end of the end floating plate 201 is flat, the other end is provided with a staggered platform for assembling the floating plates, and two ends of the middle floating plate 202 are provided with staggered platforms for assembling the floating plates. Thus, each of the floating plates of the present invention has a dislocation at an upper and/or lower portion of a side surface of the floating plate body. If there is only one dislocation on the floating plate body, it is the end floating plate 201, if there are two, it is the middle floating plate 202, two dislocations on one middle floating plate 202 cannot both be the upper dislocation 206 or the lower dislocation 207 (one side of the floating plate body is the upper dislocation 206 and the opposite side is the lower dislocation 207), nor can two dislocations on two end floating plates 201 both be the upper dislocation 206 or the lower dislocation 207 (one floating plate body is the upper dislocation 206 and the other floating plate body is the lower dislocation 207).
Further, be provided with two escape canal 101 on the lower part basis 1, the floating plate structure is located these two between the escape canal 101, every the longitudinal direction of escape canal 101 all with the longitudinal direction of lower part basis 1 is unanimous, and escape canal 101 is favorable to quick drainage, guarantees the safety that the train was driven on track structure.
Further, two rows of rail bearing platforms 203 are provided at the top end of each floating plate body, and the longitudinal direction of each row of rail bearing platforms 203 is consistent with the longitudinal direction of the lower foundation 1, in addition, the number of vibration isolator mounting holes 204 in each row is half of the number of rail bearing platforms 203 in each row, and vibration isolator mounting holes 204 are provided between two adjacent rail bearing platforms 203 in each row, so that rails can be laid and vibration reduction can be realized better.
Further, an elastic cushion 3 is provided between the upper and lower stages 206 and 207, and the elastic cushion 3 is provided with through holes as intermediate bead holes 301 at positions corresponding to the upper and lower bead holes 205 and 209. The vertical rigidity of the elastic cushion layer 3 is not less than that of the elastic vibration isolator, the vertical interaction of staggered platforms is relieved, concrete at staggered platforms is prevented from cracking and damaging, and the service life of the track structure is prolonged.
Further, two rows of lateral limit supports 5 are further provided at the top end of the lower foundation 1, the floating plate structure is located between the two rows of lateral limit supports 5, the longitudinal direction of each row of lateral limit supports 5 is consistent with the longitudinal direction of the lower foundation 1, and each lateral limit support 5 is abutted to the floating plate body. The transverse limiting support 5 limits the transverse displacement of the floating slab when the train passes at high speed and the train passes through a curve, the transverse limiting support 5 only limits the transverse displacement of the floating slab, the floating slab can still move up and down vertically, vibration reduction of the track structure is realized by means of vibration isolator operation, and special vibration reduction requirements are met. The transverse limiting support 5 is arranged to improve the transverse stability of the assembled floating slab structure, reduce the transverse load borne by the implanted steel bars 4, further optimize the stress condition of the implanted steel bars 4, improve the reliability of the track structure and strengthen the integrity of the track structure. The transverse limit support 5 is longitudinally arranged on the outer side of the floating plate along the track, and can be arranged in the middle of the side surface of the floating plate or at the end of the side surface of the floating plate.
Further, the upper bar planting hole 205 and the lower bar planting hole 209 are respectively a through hole and a blind hole, so that the implanted steel bar 4 is conveniently placed and the implanted steel bar glue is conveniently poured, so as to fixedly connect adjacent floating plates. The number of the implanted steel bars 4 (the number of the upper steel bar implanting holes 205 and the lower steel bar implanting holes 209) at the staggered position of the assembled floating plate can be adjusted according to the actual conditions of different line speed grades, vehicle axle weights and the like. The upper bar planting hole 205 is a through hole with rough interface, the implanted steel bar 4 passes through the upper bar planting hole 205 and is implanted into the lower bar planting hole 209 of the lower staggered platform 207, so as to realize the fastening connection of the upper staggered platform 206 and the lower staggered platform 207. The plurality of floating plates are formed into long floating plates in the assembling and solidifying mode, so that the integrity of the track structure of the floating plates is enhanced.
Further, a slab gap 208 exists between each of the dislocation and the floating slab body adjacent to the dislocation. The slab joint 208 is preferably 20mm to 50mm to prevent extrusion damage when the floating slab is longitudinally displaced under train load.
The track structure is designed aiming at the situation of unidirectional driving, the extending directions of all the upper staggered platforms 206 are the same, the extending directions of the upper staggered platforms 206 are the same as the driving direction of a train, and the thickness of the upper staggered platforms 206 is smaller than that of the lower staggered platforms 207, so that the adaptability of the track structure to unidirectional driving loads is improved.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (10)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212505632U (en) * | 2020-09-21 | 2021-02-09 | 中铁第四勘察设计院集团有限公司 | A prefabricated continuous floating slab track structure adapted to the driving direction |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0885903A (en) * | 1994-09-16 | 1996-04-02 | Tokyu Constr Co Ltd | Anti-vibration device for floating slab |
| AT409641B (en) * | 1999-04-13 | 2002-09-25 | Porr Allg Bauges | Ballastless superstructure with prefabricated concrete support plates as well as a procedure for the replacement of the same |
| CN1297712C (en) * | 2004-07-23 | 2007-01-31 | 尹学军 | Floating road bed |
| CN101545518B (en) * | 2008-03-29 | 2011-04-20 | 尹学军 | Vibration isolation device and application thereof |
| CN202148613U (en) * | 2011-04-14 | 2012-02-22 | 上海昭瑞减震科技有限公司 | Suspended floating plate vibration isolation system |
| KR101222079B1 (en) * | 2011-05-20 | 2013-01-15 | 한국철도기술연구원 | Method and Structure of Connection between Normal Concrete Track and Floating Slab Track |
| CN103306170B (en) * | 2012-03-13 | 2016-03-16 | 隔而固(青岛)振动控制有限公司 | Floating ballast bed and the construction method of a kind of prefabricated short slab |
| CN204385564U (en) * | 2014-12-25 | 2015-06-10 | 隔而固(青岛)振动控制有限公司 | Lap jointing type is floating ballast bed |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212505632U (en) * | 2020-09-21 | 2021-02-09 | 中铁第四勘察设计院集团有限公司 | A prefabricated continuous floating slab track structure adapted to the driving direction |
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