An assembled continuous floating plate track structure adapted to driving direction

Abstract

The present invention discloses an assembled continuous floating plate track structure adapted to the driving direction, including a lower foundation and a floating plate structure, wherein the floating plate structure includes a plurality of floating plates overlapped together, each floating plate includes a floating plate body and a rectangular parallelepiped staggered platform integrally arranged on the floating plate body, and for any two adjacent floating plates, each floating plate is provided with a staggered platform on a side close to the other floating plate, and each staggered platform extends in a direction close to the other floating plate, wherein the staggered platform on one floating plate is placed on the staggered platform of the other floating plate; the extension direction of the upper staggered platform on the floating plate body is consistent with the driving direction of the train, and the thickness of the upper staggered platform is less than the thickness of the lower staggered platform. The present invention improves the construction accuracy and stability of the floating plate, meets the special vibration reduction requirements of rail transit, and can improve the stability of the track structure while reducing the workload of on-site construction.

Description

Technical Field

[0001] The present invention belongs to the field of railway track structures, and more specifically, relates to an assembled floating plate track structure. Background Art

[0002] The vibration reduction design of rail transit engineering is the key and difficult point of rail system design. Generally speaking, the vibration reduction level is divided into three levels according to the predicted excess amount of environmental impact assessment: medium vibration reduction, high vibration reduction and special vibration reduction. Among them, the special vibration reduction measure adopts steel spring floating plate vibration reduction ballast bed.

[0003] Floating slab tracks are widely used in traditional urban rail transit subway projects, and the design and technical solutions are mature and reliable, but the vehicle operating speed does not exceed 100km / h and the vehicle axle weight does not exceed 16t.

[0004] With the rapid development of urban rail transit, the maximum operating speed of trains has reached 100-160 km / h, and the vehicle axle weight has been adopted as 17t, which is significantly higher than the operating speed of traditional urban rail transit vehicles and the increase in axle weight, which puts higher requirements on the construction accuracy and stability of the floating slab roadbed.

[0005] Patent CN110700023A proposes a method for constructing an integral steel spring floating plate ballast bed based on track engineering. This construction method is based on the steel spring floating plate ballast bed used in domestic urban rail transit, and mostly adopts short sleeper or sleeper-free cast-in-place ballast bed. The on-site construction and concrete pouring of the cast-in-place ballast bed are large, which brings about a series of problems such as environmental pollution, large labor volume, and long construction period. In addition, since the short sleepers are independent structures and no fixed connection method is set between the sleepers, the interaction force between the rails is transmitted only by the ballast bed concrete, and the ability to maintain the geometric behavior of the track is poor. After the construction is completed, the gauge deviation of the steel spring floating plate ballastless ballast bed is large, the rail bottom slope is unevenly distributed, and the workload of track fine-tuning is large, which affects the smooth operation of the train.

[0006] Patent CN203475237U proposes a prefabricated steel spring floating plate, which transmits the lateral force between the floating plates through the end bosses, and the floating plates are connected by hinges. Although this solution uses a prefabricated track plate, its hinged method makes it difficult to replace the floating plate during later maintenance and repair. The end hinged method makes it difficult to easily remove the prefabricated floating plate when a disease occurs. Multiple floating plates need to be lifted at the same time to replace and repair the floating plates, which is a lot of work. The vertical force at the transition point of the floating plate in this solution is provided by the hinge, which is not friendly to the force of the hinge device of the floating plate and poses a safety hazard.

[0007] Patent CN204385564U proposes a lap-jointed floating ballast bed, which cancels the traditional hinged mode at the transition of the floating plate, and transmits the vertical load of the train through the platform of the two ballast plates. This scheme uses bolts with upper and lower through holes to fix the overlap at the floating plate platform, but because the space height under the floating plate is only 20-40mm, the bolts with through holes do not have the conditions for construction operation under the floating plate during installation and later maintenance, so this fixing method still has defects. In addition, the hinged mode used in the traditional floating plate ballast bed is cancelled in this scheme, and the floating plate platform is used to transmit the vertical force. The transmission of the lateral force and the longitudinal force at the transition of the floating plate is all completed by the through-hole bolts. Under the fatigue of the large train load, the slender bolts are easily damaged, the force environment is not friendly, and there are safety hazards. At the same time, in this scheme, the thickness of the upper and lower platforms is kept consistent, and when the train is driving in both directions, the bending moment of the lower misalignment platform is greater, and cracks are easily generated at the disassembly of the lower misalignment platform, which makes driving a safety hazard.

[0008] Therefore, in order to improve the construction accuracy and stability of the floating slab, and on the premise of meeting the special vibration reduction requirements of rail transit, an assembled floating slab track structure that is adapted to the driving direction is proposed, which can reduce the workload of on-site construction while improving the stability of the track structure, which is in line with future development trends. Summary of the invention

[0009] In response to the above defects or improvement needs of the prior art, the present invention provides an assembled continuous floating plate track structure that can adapt to the driving direction, which improves the construction accuracy and stability of the floating plate, meets the special vibration reduction requirements of rail transit, and can reduce the workload of on-site construction while improving the stability of the track structure.

[0010] To achieve the above object, according to one aspect of the present invention, there is provided an assembled continuous floating plate track structure adapted to the driving direction, characterized in that it comprises a lower foundation and a floating plate structure placed on the lower foundation through an elastic vibration isolator, there is a gap under the plate between the floating plate structure and the lower foundation, the floating plate structure comprises a plurality of floating plates overlapped together, each of the floating plates comprises a floating plate body and a rectangular parallelepiped staggered platform integrally arranged on the floating plate body, and:

[0011] For any two adjacent floating plates, each of the floating plates is provided with the offset platform on one side close to the other floating plate, each offset platform extends in the direction close to the other floating plate, and the offset platform on one floating plate is placed on the offset platform of the other floating plate; the higher offset platform and the lower offset platform are respectively an upper offset platform and a lower offset platform, the extension direction of the upper offset platform on the floating plate body is consistent with the running direction of the train, the distance from the upper surface to the lower surface of the upper offset platform, that is, its thickness is h1, the distance from the upper surface to the lower surface of the lower offset platform, that is, its thickness is h2, h1<h2, the upper offset platform is provided with an upper reinforcement hole, the lower offset platform is provided with a lower reinforcement hole at a position corresponding to the upper reinforcement hole, and the upper and lower offset platforms are fixedly connected by reinforcing bars in the upper and lower reinforcement holes.

[0012] Preferably, two drainage ditches are provided on the lower foundation, the floating plate structure is located between the two drainage ditches, and the longitudinal direction of each drainage ditch is consistent with the longitudinal direction of the lower foundation.

[0013] Preferably, two rows of rail supports are provided at the top of each floating plate body, and the longitudinal direction of each row of rail supports is consistent with the longitudinal direction of the lower foundation.

[0014] Preferably, each of the floating plate bodies is provided with two rows of vibration isolator mounting holes, the longitudinal direction of each row of the 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 the number of support rails in each row, and vibration isolator mounting holes are arranged between two adjacent support rails in each row.

[0015] Preferably, an elastic cushion layer is provided between the upper staggered platform and the lower staggered platform, and the elastic cushion layer is provided with through holes as intermediate rebar embedding holes at positions corresponding to the upper rebar embedding holes and the lower rebar embedding holes.

[0016] Preferably, the vertical stiffness of the elastic cushion layer is not less than the vertical stiffness of the elastic vibration isolator.

[0017] Preferably, h1 / h2=0.5-0.75.

[0018] Preferably, there is a plate gap between each of the offsets and the floating plate body adjacent to the offset.

[0019] Preferably, two rows of transverse limit supports are also provided at the top of the lower foundation, and the floating plate structure is located between the two rows of transverse limit supports. The longitudinal direction of each row of transverse limit supports is consistent with the longitudinal direction of the lower foundation, and each of the transverse limit supports is abutted against the floating plate body to limit the lateral displacement of the floating plate body.

[0020] Preferably, the upper reinforcement hole and the lower reinforcement hole are respectively a through hole and a blind hole.

[0021] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0022] 1) Through the implementation of the present invention, the construction accuracy of the floating slab roadbed can be improved, and the geometric shape and position maintaining ability of the rails and sleepers can be improved to meet the special vibration reduction needs of higher speeds (100-160km / h), fill the gap in the special vibration reduction track structure of the urban rail, and can also be used on intercity, subway and other lines.

[0023] 2) The assembled floating plate track structure is adopted. The floating plate is prefabricated in the factory, which reduces the amount of concrete pouring on the construction site and improves the construction efficiency. At the same time, the precision of the prefabricated floating plate is significantly improved compared with the cast-in-place floating plate, which is conducive to improving the construction accuracy, improving the stability of the track structure, and improving the smoothness of train operation.

[0024] 3) The short floating slab is assembled and consolidated on site to form a long floating slab structure, which improves the stability of the track structure and meets the needs of special vibration reduction. In addition, the short floating slab has the characteristics of small size and light weight, which can improve the flexibility of on-site construction and the convenience of subsequent maintenance and repair.

[0025] 4) Adopting the method of implanting steel bars, passing through the implanting holes on the floating slabs, and fixing and connecting adjacent floating slabs, the installation strength of the floating slab track misalignment connection is more reliable, and the assembly and installation efficiency of the floating slabs is improved.

[0026] 5) The upper and lower misaligned platforms are connected and fixed by implanting steel bars through the implanting holes of the upper and lower misaligned platforms. Adjacent floating slabs are implanted with steel bars to form a long floating slab structure, and multiple short floating slabs are assembled to form a long floating slab structure, thereby improving the integrity of the floating slab track structure.

[0027] 6) A vibration isolation cushion is set between the upper and lower layers to buffer the vertical interaction force between adjacent floating slabs and avoid concrete extrusion damage at the interface between the upper and lower layers.

[0028] 7) The upper and lower staggered platforms of the floating slab adopt a thin-on-top and thick-on-bottom proportional structure, which can further improve the adaptability of the structural strength of the staggered platform assembly to the one-way traffic load, and improve the structural strength of the lower staggered platform to meet the load characteristics of one-way train passing on the line, thereby improving the utilization rate of the strength of the concrete material.

[0029] 8) Transverse limit supports are set on both sides of the middle or end of the floating slab to limit the lateral displacement of the floating slab when the train passes at high speed or on a curve, reduce the transmission of the lateral force of the track to the implanted steel bars, improve the stress environment of the implanted steel bars, and improve the overall reliability of the track structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is an exploded schematic diagram of the present invention;

[0032] Figure 3 It is a side view of the present invention during staggered assembly;

[0033] Figure 4 It is a cross-sectional schematic diagram of the present invention during staggered assembly;

[0034] Figure 5 It is a structural diagram of the floating plate located at the end in the present invention;

[0035] Figure 6 It is a structural diagram of the floating plate located in the middle of the present invention;

[0036] Figure 7 It is a schematic diagram of the elastic cushion layer in the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 to Figure 7 As shown, an assembled continuous floating plate track structure adapted to the driving direction includes a lower foundation 1 and a floating plate structure placed on the lower foundation 1 through an elastic vibration isolator, there is an under-plate gap 102 between the floating plate structure and the lower foundation 1, the floating plate structure includes a plurality of floating plates overlapped together, each of the floating plates includes a floating plate body and a rectangular parallelepiped staggered platform integrally arranged on the floating plate body, each of the floating plate bodies is provided with two rows of vibration isolator mounting holes 204, the longitudinal direction of each row of the vibration isolator mounting holes 204 is consistent with the longitudinal direction of the lower foundation 1, an elastic vibration isolator is installed in each of the vibration isolator mounting holes 204, the floating plate is supported by the elastic vibration isolator, and:

[0039] For any two adjacent floating plates, each of the floating plates is provided with the staggered platform on one side close to the other floating plate, each staggered platform extends in the direction close to the other floating plate, and the staggered platform on one floating plate is placed on the staggered platform of the other floating plate; the higher staggered platform and the lower staggered platform are respectively the upper staggered platform 206 and the lower staggered platform 207 (the upper staggered platform 206 is located above the lower staggered platform 207, and the two are to be overlapped), the top of the upper staggered platform 206 is preferably flush with the top of the floating plate body, and the lower staggered platform 207 is preferably flush with the top of the floating plate body. The top of 07 is preferably flush with the bottom of the floating plate body, the extension direction of the upper staggered platform 206 on the floating plate body is consistent with the running direction of the train, the distance from the upper surface to the lower surface of the upper staggered platform 206, i.e., its thickness, is h1, and the distance from the upper surface to the lower surface of the lower staggered platform 207, i.e., its thickness, is h2, h1<h2, preferably, h1 / h2=0.5~0.75, preferably h1:h2=2:3, 2:4 or 3:4; the thickness of the upper staggered platform 206 and the lower staggered platform 207 of the floating plate are set according to the principle of "thin on top and thick on bottom". Since the trains running on the actual line are usually unidirectional relative to the floating plate track structure, for the asymmetric track structure form proposed in the present invention, the thickness of the upper staggered platform 206 and the lower staggered platform 207 are set according to the principle of "thin on top and thick on bottom", which is conducive to improving the adaptability of the track structure to the unidirectional driving load, so that the assembled track structure proposed in the present invention is adapted to the actual driving direction.

[0040] The upper offset platform 206 is provided with an upper rebar hole 205, and the lower offset platform 207 is provided with a lower rebar hole 209 at a position corresponding to the upper rebar hole 205. The upper offset platform 206 and the lower offset platform 207 are fixedly connected by rebar embedding in the upper rebar hole 205 and the lower rebar hole 209.

[0041] Reference Figure 1 , Figure 2 , Figure 5 and Figure 6 The floating plate of the present invention can have three structural types: the first end floating plate 201 ( Figure 5 )、Intermediate floating plate 202( Figure 6) and a second end floating plate (not shown in the figure). The middle floating plate 202 is located between the first end floating plate 201 and the second end floating plate; the first end floating plate 201 includes a first floating plate body and an upper staggered platform 206, and the upper staggered platform 206 of the first end floating plate 201 is integrally arranged at the upper part of the first end floating plate 201 body on the side close to the middle floating plate 202; the second end floating plate includes a second floating plate 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 the second end floating plate body on the side close to the middle floating plate 202;

[0042] The intermediate floating plate 202 includes an intermediate floating plate 202 body, an upper staggered platform 206 and a lower staggered platform 207, and the lower staggered platform 207 of the intermediate floating plate 202 is arranged at the lower part of the side of the intermediate floating plate 202 body close to the first end floating plate 201, and the upper staggered platform 206 of the intermediate floating plate 202 is arranged at the upper part of the side of the intermediate floating plate 202 body close to the first end floating plate 201. There can be multiple intermediate floating plates 202, and they have the same structure.

[0043] The upper offset 206 of the first end floating plate 201 is overlapped with the lower offset 207 of the middle floating plate 202 and then fixedly connected by anchoring. The two adjacent middle floating plates 202 are overlapped with the upper offset 206 and the lower offset 207 and then fixedly connected by anchoring. The upper offset 206 of the middle floating plate 202 is overlapped with the lower offset 207 of the second end floating plate and then fixedly connected by anchoring.

[0044] The floating plate of the present invention can be prefabricated in a factory. One end of the end floating plate 201 is flat and the other end is provided with a staggered plate for assembly between floating plates. Both ends of the middle floating plate 202 are provided with staggered plates for assembly between floating plates. Therefore, each floating plate of the present invention has a staggered plate, which is located at the upper part and / or the lower part of the side of the floating plate body. If there is only one staggered portion on the floating plate body, it is the end floating plate 201; if there are two staggered portions, they are the middle floating plate 202; the two staggered portions on one middle floating plate 202 cannot both be upper staggered portions 206 or lower staggered portions 207 (one side of the floating plate body is the upper staggered portion 206 and the other side is the lower staggered portion 207); the two staggered portions on the two end floating plates 201 cannot both be upper staggered portions 206 or lower staggered portions 207 (if one of the floating plate bodies has the upper staggered portion 206, the other floating plate body has the lower staggered portion 207).

[0045] Furthermore, two drainage ditches 101 are arranged on the lower foundation 1, and the floating plate structure is located between the two drainage ditches 101. The longitudinal direction of each drainage ditch 101 is consistent with the longitudinal direction of the lower foundation 1. The drainage ditch 101 is conducive to rapid drainage and ensures the safety of the train running on the track structure.

[0046] Furthermore, two rows of rail supports 203 are provided at the top of each floating plate body, and the longitudinal direction of each row of rail supports 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 the number of rail supports 203 in each row, and vibration isolator mounting holes 204 are provided between two adjacent rail supports 203 in each row to facilitate the laying of rails and better vibration reduction.

[0047] Furthermore, an elastic cushion layer 3 is provided between the upper offset platform 206 and the lower offset platform 207, and the elastic cushion layer 3 is provided with a through hole as an intermediate anchor hole 301 at a position corresponding to the upper anchor hole 205 and the lower anchor hole 209. The vertical stiffness of the elastic cushion layer 3 is not less than the vertical stiffness of the elastic vibration isolator, which alleviates the vertical interaction of the offset platforms, prevents the concrete at the offset platforms from cracking and breaking, and improves the service life of the track structure.

[0048] Furthermore, two rows of transverse limit supports 5 are also provided at the top of the lower foundation 1, and the floating plate structure is located between the two rows of transverse limit supports 5. The longitudinal direction of each row of transverse limit supports 5 is consistent with the longitudinal direction of the lower foundation 1, and each transverse limit support 5 is in contact with the main body of the floating plate. The transverse limit supports 5 limit the transverse displacement of the floating plate when the train passes at high speed and the train passes through the curve. The transverse limit supports 5 only limit the transverse displacement of the floating plate, and the floating plate can still move up and down vertically. The vibration reduction of the track structure is achieved by relying on the vibration isolator to meet special vibration reduction requirements. The transverse limit supports 5 can improve the transverse stability of the assembled floating plate structure, while reducing the transverse load on the implanted steel bars 4, further optimizing the force conditions of the implanted steel bars 4, improving the reliability of the track structure, and enhancing the integrity of the track structure. The transverse limit supports 5 are arranged on the outside of the floating plate along the longitudinal direction of the track, and can be set in the middle of the side of the floating plate or at the end of the side of the floating plate.

[0049] Furthermore, the upper rebar holes 205 and the lower rebar holes 209 are through holes and blind holes, respectively, which are convenient for placing the implanted steel bars 4 and injecting the rebar glue to fix and connect the adjacent floating plates. The number of implanted steel bars 4 at the offset of the assembled floating plate (the number of upper rebar holes 205 and lower rebar holes 209) can be adjusted according to the actual conditions of the line such as different line speed levels and vehicle axle weights. The upper rebar holes 205 are through holes with rough interfaces. The implanted steel bars 4 pass through the upper rebar holes 205 and are implanted into the lower rebar holes 209 of the lower offset 207, thereby achieving a fastened connection between the upper offset 206 and the lower offset 207. Multiple floating plates are assembled and consolidated in the above manner to form a long floating plate, thereby enhancing the integrity of the floating plate track structure.

[0050] Furthermore, there is a plate gap 208 between each offset and the floating plate body adjacent to the offset. The plate gap 208 is preferably 20 mm to 50 mm to prevent the floating plate from being squeezed and damaged when it is longitudinally displaced under the load of the train.

[0051] The track structure of the present invention is designed for one-way traffic. The extension direction of all upper staggered platforms 206 is the same and is the same as the direction of train traffic. The thickness of the upper staggered platforms 206 is smaller than that of the lower staggered platforms 207, which is beneficial to improving the adaptability of the track structure to one-way traffic loads.

[0052] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An assembled continuous floating plate track structure adapted to the driving direction, characterized in that: The invention comprises a lower foundation and a floating plate structure placed on the lower foundation through an elastic vibration isolator, a gap under the plate exists between the floating plate structure and the lower foundation, the floating plate structure comprises a plurality of floating plates overlapped together, each of the floating plates comprises a floating plate body and a rectangular parallelepiped staggered platform integrally arranged on the floating plate body, and: For any two adjacent floating plates, each of the floating plates is provided with the offset platform on one side close to the other floating plate, each offset platform extends in the direction close to the other floating plate, and the offset platform on one floating plate is placed on the offset platform of the other floating plate; the higher offset platform and the lower offset platform are respectively an upper offset platform and a lower offset platform, the extension direction of the upper offset platform on the floating plate body is consistent with the running direction of the train, the distance from the upper surface to the lower surface of the upper offset platform, that is, its thickness is h1, the distance from the upper surface to the lower surface of the lower offset platform, that is, its thickness is h2, h1<h2, the upper offset platform is provided with an upper reinforcement hole, the lower offset platform is provided with a lower reinforcement hole at a position corresponding to the upper reinforcement hole, and the upper and lower offset platforms are fixedly connected by reinforcing bars in the upper and lower reinforcement holes.

2. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1 is characterized in that: Two drainage ditches are arranged on the lower foundation, and the floating plate structure is located between the two drainage ditches. The longitudinal direction of each drainage ditch is consistent with the longitudinal direction of the lower foundation.

3. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1 is characterized in that: Two rows of rail platforms are arranged at the top of each floating plate body, and the longitudinal direction of each row of rail platforms is consistent with the longitudinal direction of the lower foundation.

4. The assembled continuous floating plate track structure adapted to the driving direction according to claim 3 is characterized in that: Two rows of vibration isolator mounting holes are arranged on each of the floating plate bodies, 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 the number of support rails in each row, and vibration isolator mounting holes are arranged between two adjacent support rails in each row.

5. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1 is characterized in that: An elastic cushion layer is arranged between the upper staggered platform and the lower staggered platform, and the elastic cushion layer is provided with through holes as intermediate rebar planting holes at positions corresponding to the upper rebar planting holes and the lower rebar planting holes.

6. The assembled continuous floating plate track structure adapted to the driving direction according to claim 5, characterized in that: The vertical stiffness of the elastic cushion layer is not less than the vertical stiffness of the elastic vibration isolator.

7. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1 is characterized in that: h1 / h2=0.5~0.

75.

8. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1 is characterized in that: There is a plate gap between each of the offsets and the floating plate body adjacent to the offset.

9. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1, characterized in that: Two rows of transverse limit supports are also arranged at the top of the lower foundation, and the floating plate structure is located between the two rows of transverse limit supports. The longitudinal direction of each row of transverse limit supports is consistent with the longitudinal direction of the lower foundation, and each transverse limit support abuts against the floating plate body to limit the lateral displacement of the floating plate body.

10. The assembled continuous floating plate track structure adapted to the driving direction according to claim 1, characterized in that: The upper reinforcement hole and the lower reinforcement hole are respectively a through hole and a blind hole.

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